WO2021198857A1

WO2021198857A1 - Coin-type lithium-ion cells

Info

Publication number: WO2021198857A1
Application number: PCT/IB2021/052475
Authority: WO
Inventors: Tushar Rameshwar Parate; Sarvani Kuchibhotla; Nileshwar Pramila Rao; Samraj Jabez Dhinagar
Original assignee: Tvs Motor Company Limited
Priority date: 2020-03-31
Filing date: 2021-03-25
Publication date: 2021-10-07
Also published as: EP4128411A1; CN115336058A

Abstract

A coin-type Lithium-ion cell comprises a first electrode of a first polarity and a second electrode of a second polarity. The first electrode has a first segment and a second segment. The first segment has a first side and a second side. The second segment comprises a third side and a fourth side. The second electrode has a plurality of segments. The first side, the second side, and the third side face a segment of the second electrode and the fourth side faces no segment of the second electrode. The first side and the second side have a coating of a first active material. The third side either has a coating of the first active material or has no coating and the fourth side has no coating.

Description

COIN-TYPE LITHIUM-ION CELLS

FIELD OF INVENTION

[0001] The present subject matter is related to, in general, Lithium (Li)-ion cells and, in particular, coin-type Li-ion cells.

BACKGROUND

[0002] Coin-type Li-ion cells are used in small electronic devices, such as LCD driver boards, hearing aids, calculators, and the like, because of their smaller size, lighter weight, and higher energy-efficiency. The coin-type Li-ion cells have a positive electrode and a negative electrode, where the chemical reactions occur to produce electrical power from chemical energy.

BRIEF DESCRIPTION OF DRAWINGS

[0003] The detailed description is provided with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to reference like features and components.

[0004] Fig. 1a illustrates an exploded view of a coin-type Lithium (Li)-ion cell, in accordance with an implementation of the present subject matter;

[0005] Fig. 1b illustrates an exploded view of a coin-type Li-ion cell, in accordance with an implementation of the present subject matter;

[0006] Fig. 2a illustrates a front view of a positive electrode and a negative electrode, in accordance with an implementation of the present subject matter; [0007] Fig. 2b illustrates a top view of a positive electrode and a negative electrode, in accordance with an implementation of the present subject matter;

[0008] Fig. 3 illustrates a positive electrode, in accordance with an implementation of the present subject matter;

[0009] Fig. 4 illustrates a separator to be interposed between a positive electrode and a negative electrode, in accordance with an implementation of the present subject matter;

[0010] Fig. 5 illustrates selectively coated positive electrode and a negative electrode, in accordance with an implementation of the present subject matter;

[0011] Fig. 6 illustrates selectively coated positive electrode and a negative electrode, in accordance with an implementation of the present subject matter; [0012] Fig. 7 illustrates a top view of a positive electrode, in accordance with an implementation of the present subject matter;

[0013] Fig. 8 illustrates selectively coated positive electrode and a negative electrode, in accordance with an implementation of the present subject matter; and [0014] Fig. 9 illustrates a method for manufacturing a coin-type Li- ion cell, in accordance with an implementation of the present subject matter.

DETAILED DESCRIPTION

[0015] Small electronic devices, such as LCD driver boards, watches, and the like, use coin-type Lithium (Li)-ion cells as power sources, because of energy efficiency, lighter weight and smaller size of such cells. Since the coin-type cells have a smaller dimension, the electrical capacity of such cells may be limited. For instance, one conventional coin-type cell may have a diameter of 20 mm and a thickness of 3.2 mm and an electrical capacity of 235 mAh.

[0016] In some cases, to increase the electrical capacity of the cells, a thickness of a coating of an active material on a positive electrode and a thickness of a coating of an active material on a negative electrode are increased. Due to the increase in thickness of coating of the active material, the weight of the positive electrode and the weight of the negative electrode increases. Further, in such cases, the surface-to- volume ratio of the cell decreases and thereby, the increase of electrical capacity of the cells is less.

[0017] The electrical capacity of coin-type Li-ion cells, in some cases, are increased by stacking a plurality of positive electrodes and a plurality of negative electrodes alternately on top of each other. In such cases, additional components, such as contact tabs, are used for establishing contact of each electrode with the corresponding terminal to extract electrical power from the electrode. Such contact tabs may occupy a sizeable amount of space inside the cell. Accordingly, the utilization of the space by the positive electrode and the negative electrode inside the cell may be reduced. Further, the use of such contact tabs may increase the complexity of the assembly of the electrodes.

[0018] Further, in some cases, the electrical capacity of a coin-type Li-ion cell may be increased by coiling or winding of electrodes. Layers of positive electrodes and negative electrodes are alternately wound over each other to form an electrode assembly. However, in such cases, the thickness of the electrodes increases, and the assembly of electrodes becomes complex. Since the coin-type cells have a fixed thickness, such electrodes with increased thickness may not be easily accommodated in the coin-type cell. Further, upon winding, there may be a displacement of one or more layers of the positive electrode and one or more layers of the negative electrode from their initially wound positions. This may result in reduction of transfer of Li-ions in the cell and may not increase the electrical capacity of the cell. The provision of positional holes in the positive electrode and the negative electrode to hold the layers of the positive electrode and the layers of the negative electrode in their originally coiled portions may further increase the complexity of electrode assembly.

[0019] The present subject matter relates to coin-type Lithium (Li)- ion cell. With the implementations of the present subject matter, the electrical capacity of the coin-type Li-ion cells may be increased without using a complex assembly between the positive electrode and the negative electrode and without the use of additional components inside the cell.

[0020] In accordance with an example implementation, a coin-type Li-ion cell may comprise a first electrode and a second electrode. The first electrode may be of a first polarity and the second electrode may be of a second polarity. For instance, the first electrode may be a positive electrode and the second electrode may be a negative electrode. The first electrode may comprise a first segment and a second segment. The first segment may have a first side and a second side opposite the first side. Similarly, the second segment may have a third side and a fourth side opposite the third side. The second electrode may also comprise a plurality of segments. For instance, the second electrode may comprise a third segment and a fourth segment.

[0021] In an example, each of the first side and the second side may face a segment of the second electrode. For instance, the first side may face a side of the fourth segment and the second side may face a side of the third segment. Further, the third side may face a segment of the second electrode. For instance, the third side may face another side of the third segment. Furthermore, the fourth side may face no segment of the second electrode. [0022] The sides of the segments of the positive electrode may have a coating of an active material (referred to hereinafter as “first active material”) to act as a source of Li-ions and electrons. For instance, during the operation of the cell, the Li-ions may flow between the positive electrode and the negative electrode inside the cell and the electrons may flow through an external circuit to produce electrical power form the cell. The coating with the active material may be done selectively, i.e., not all sides of all segments may be coated with the active material. The coating on a segment may depend on number of sides of the segment that face another segment and the electrical capacity requirements of the cell. For instance, a segment of an electrode may have a coating on two of its sides, on one of its sides or none of its sides depending on the number of its sides facing segments of another electrode and the electrical capacity requirements of the cell. In an example, the first side and the second side may each have a coating of a first active material, as each of the first side and the second side may face a segment of the negative electrode. The third side may have a coating of the first active material, as the third side may face another side of the third segment. In some cases, the third side may have no coating to prevent the flow of Li-ions from the third side. Further, the fourth side may have no coating, as the fourth side faces no segment of the negative electrode.

[0023] The present subject matter, by having an increased number of sides of the electrode segments with coating, increases the energy density and the electrical capacity of coin-type Li-ion cells with a simple arrangement between the positive electrode and the negative electrode. Further, since the present subject matter uses selective coating of electrode segments, the present subject matter prevents use of excess active materials in the cells and reduces the increase in thickness of the positive electrode and the negative electrode. Further, the present subject matter also reduces the increase of weight of the cells which may otherwise occur due to usage of excess active material. Furthermore, in the present subject matter, the positive electrode and the negative electrode are connected to the terminals of the cell directly through an uncoated side of the electrode, such as through an uncoated side of the first segment (i.e., fourth side) of positive electrode and an uncoated side of the fourth segment (i.e., eighth side) of negative electrode. Accordingly, the present subject matter prevents use of additional components, such as contact tabs, which may occupy some amount of space inside the cells. Therefore, the present subject matter facilitates maximum utilization of space inside the cells.

[0024] The present subject matter is further described with reference to Figs. 1-9. It should be noted that the description and figures merely illustrate principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.

[0025] Fig. 1a illustrates an exploded view of a coin-type Lithium (Li)-ion cell 100, in accordance with an implementation of the present subject matter. The coin-type Li-ion coin cell 100 (alternatively referred to hereinafter as “cell”) may include a first electrode 102 and a second electrode 104. The first electrode 102 may have a first polarity and the second electrode 104 may have a second polarity. For instance, the first electrode 102 may have a positive polarity and may be referred to as positive electrode. The second electrode 104 may have a negative polarity and may be referred to as negative electrode. Hereinafter, the first electrode 102 may be explained with reference to positive electrode and the second electrode 104 may be explained with reference to the negative electrode. [0026] In an example, the positive electrode 102 may have a plurality of segments, such as a first segment 106 and a second segment 108. Similarly, the negative electrode 104 may have a plurality of segments, such as a third segment 110 and a fourth segment 112.

[0027] The cell 100 may further include end-casings, such as a lower end-casing 114 and an upper end-casing 116, which may house components of the cell 100, such as the first electrode 102 and the second electrode 104. The lower end-casing 114 and the upper end-casing 116 may be, for example, of a cylindrical shape and may be coupled together, along the direction of the axis A-A to form the body of the cell 100. The lower end-casing 114 and the upper end-casing 116 may be, for example, crimped together along the axis A-A. The positive electrode 102 and the negative electrode 104 may be arranged such that segments of the positive electrode 102 may face segments of the negative electrode 104 and vice-versa.

[0028] The cell 100 may further include a plurality of separators (not shown in Fig. 1a). For instance, a separator may be interposed between a segment of the positive electrode 102 and a segment of the negative electrode 104 that may face each other. The separators may prevent the electrical contact between the positive electrode 102 and the negative electrode 104 and may facilitate travel of Li-ions between the positive electrode 102 and the negative electrode 104 and vice-versa. To facilitate the travel of Li-ions between the positive electrode 102 and the negative electrode 104 and vice-versa, the separators may also include the electrolyte.

[0029] In an example, the end-casings 114, 116 may act as terminals of the cell 100. For instance, the lower end-casing 114 may act as a first terminal and the upper end-casing 116 may act as a second terminal. The first terminal 114 may be, for example, a positive terminal and the second terminal 116 may be, for example, a negative terminal. Hereinafter, the first terminal 114 may be explained with reference to the positive terminal and the second terminal 116 may be explained with reference to the negative terminal. To facilitate supply of electrical power from the cell 100, the first electrode 102 may be connected to the positive terminal 114 and the second electrode 104 may be connected to the negative terminal 116. For instance, the second segment 108 may be connected to the positive terminal 114 and the fourth segment 112 may be connected to the negative terminal 116. In some examples, the positive electrode 102 and the negative electrode 104 may include additional segments. For instance, additional segments of the positive electrode 102 may be provided between the first segment 106 and the second segment 108 and additional segments of the negative electrode 104 may be provided between the third segment 110 and the fourth segment 112. The segments that are provided at the ends of the electrode may be referred to as the end segments.

[0030] In an example, the cell 100 may include other components, such as a plurality of metal spacers (not shown in Fig. 1a), a plurality of ring springs (not shown in Fig. 1a). For instance, the first electrode 102 may be connected to the first terminal 114 through a metal spacer and a ring spring. Similarly, the second electrode 104 may be connected to the second terminal 116 through another metal spacer and another ring spring. The use of ring springs may ensure that the uniform pressure is exerted on the electrodes, when the electrodes are housed inside the end- casings 114, 116. Further, the cell 100 may include an O-ring gasket (not shown in Fig. 1) to prevent short circuiting between the terminals of the cell 100 and between the positive electrode 102 and the negative electrode 104 when the upper end-casing 116 and the lower end-casing 114 are crimped together.

[0031] Although in an example, the cell 100 may include the ring springs and the metal spacers, in some examples, the ring springs and the metal spacers may not be used. In such examples, the positive electrode 102 and the negative electrode 104 may be in direct contact with their respective terminals. Accordingly, the space hitherto occupied by the ring spring and the metal spacers may now be utilized by the electrodes with increased thickness. Accordingly, the energy density and the electrical capacity of the cell 100 may be increased.

[0032] Fig. 1b illustrates an exploded view of the coin-type Li-ion cell 100, in accordance with an implementation of the present subject matter. During operation of the cell 100, chemical reactions occurs at the positive electrode 102 and the negative electrode 104 which produces electrical power from the cell 100. For instance, during charging cycle, Li- ions from the positive electrode 102 may flow to the negative electrode 104 through an electrolyte in the cell (not shown in Fig. 1b). On the other hand, the electrons may flow from the positive electrode 102 to the negative electrode 104 through an external circuit via the positive terminal 114 and the negative terminal 116 of the cell 100. When all the Li ions from the positive electrode 102 reach the negative electrode 104, the cell 100 may be fully charged. Further, during discharging, the Li-ions flow back from the negative electrode 104 to the positive electrode 102 through the electrolyte, and the electrons flow from the negative electrode 104 to the positive electrode 102 through an external circuit via positive terminal 114 and the negative terminal 116, thereby, producing electrical power. The cell 100 may be completely discharged when all the Li- ions reach the positive electrode 102. The positive electrode 102 and the negative electrode 104 may have a coating of the first active material and the second active material respectively, which may act as a source of Li-ions and electrons. Such an active material may be coated on some sides of the positive electrode 102 and some sides of the negative electrode 104.

[0033] The electrical capacity of the cell 100 may be a measure of the electrical energy stored inside the cell 100 and the energy density may be defined as the energy stored per unit mass of the cell 100. To increase the energy density and the electrical capacity of the cell 100, the number of regions (referred to hereinafter as overlapping region), where the positive electrode 102 having a coating of the first active material and the negative electrode 104 having a coating of the second active material face each other, may have to be increased. For instance, to increase the number of overlapping regions, the positive electrode 102 and the negative electrode 104 may be folded. The folding of the electrodes to increase the number of overlapping regions may increase the Li-ion density inside the cell 100, thereby increasing the electrical capacity of the cell 100 and the energy density of the cell 100. The increase in the Li-ion density inside the cell 100 may increase number of electrons flowing through the external circuit and the current output from the cell 100.

[0034] In an example, the positive electrode 102 may be folded, such that first segment 106 may be inclined at an angle relative to the second segment 108. The angle of inclination may be an angle, for example, between 0° and 90°. Similarly, the negative electrode 104 may be folded such that the third segment 110 may be inclined at an angle, between 0° and 90°, relative to the fourth segment 112. The positive electrode 102 may be disposed relative to the negative electrode 104 in their respective folded states, such that the segments of the positive electrode 102 may face segments of the negative electrode 104. In an example, the positive electrode 102 and the negative electrode 104 may be arranged relative to each other along an axis B-B, in their respective folded states, such that the first segment 106 may face the third segment 110 and the fourth segment 112. Further, the third segment 110 may additionally face the second segment 108. This arrangement of the positive electrode 102 and the negative electrode 104 may increase the number of overlapping regions. [0035] The separators (not shown in Fig. 1b) may be interposed between a segment of the positive electrode 102 and a segment of the negative electrode 104. For instance, a separator may be positioned between the first segment 106 and the fourth segment 112, a separator may be positioned between the first segment 106 and the third segment 110, a separator may be positioned between the third segment 110 and the second segment 108. The interposing of the separator between the segments of the positive electrode 102 and the negative electrode 104 may facilitate flow of Li-ions from the positive electrode 102 and the negative electrode 104 and vice-versa, during the operation of the cell 100. The separator may be aligned such that edges of the separator may match with edges of the corresponding segments of the electrodes.

[0036] Fig. 2a illustrates a front view of the positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter.

[0037] Each segment of the positive electrode 102 and each segment of the negative electrode 104 may have two sides, which are opposite each other. For instance, the first segment 106 may have a first side 202 and a second side 204. The second side 204 may be opposite the first side 202. The second segment 108 may have a third side 206 and a fourth side 208. The fourth side 208 may be opposite the third side 206. The third segment 110 may have a fifth side 210 and a sixth side 212. The sixth side 212 may be opposite the fifth side 210. The fourth segment 112 may have a seventh side 214 and an eighth side 216. The eighth side 216 may be opposite the seventh side 214.

[0038] In an example, the positive electrode 102 and the negative electrode 104 may be disposed such that the each of the first side 202, the second side 204, and the third side 206 may face a segment of the negative electrode 104. For instance, the first side 202 may face the seventh side 214, the second side 204 may face the sixth side 212, and the third side 206 may face the fifth side 210. Such an arrangement may be facilitated due to the folding of the positive electrode 102 and due to the folding of the negative electrode 104. During the operation of the cell 100, due to the coating of the sides of the positive electrode 102 and the negative electrode 104 with the corresponding active material, the Li-ions may flow between the seventh side 214 and the first side 202, between the second side 204 and the sixth side 212, and between the fifth side 210 and the third side 206. The number of overlapping regions between the positive electrode 102 and the negative electrode 104 may be three, which is greater than the scenario where a side of the positive electrode 102 faces a side of the negative electrode 104.

[0039] To facilitate travel of Li-ions between the positive electrode 102 and the negative electrode 104, and to prevent electrical contact between the positive electrode 102 and the negative electrode 104 in each of the overlapping regions, a separator may be interposed at each overlapping region. The separators may include the electrolyte. For instance, to include the electrolyte, the separators may be soaked in a solution of electrolyte. Accordingly, the Li-ions travel between the positive electrode 102 to the negative electrode 104 and vice-versa through each separator. In an example, a first separator 218-1 may be interposed between the first side 202 and the seventh side 214, a second separator 218-2 may be interposed between the second side 204 and the sixth side 212, and a third separator 218-3 may be interposed between the third side 206 and the fifth side 210. The separators 218-1 , 218-2, 218-3 may be generally referred to as the separator 218. As will be understood, the number of separators 218 used may be equal to the number of overlapping regions. In an example, each separator 218 may be made from Olefin ethylene, ceramic-coated polyolefin, polyethylene, polypropylene, a laminate of polyethylene and polypropylene or any combination thereof. [0040] Further, to prevent the electrical contact between the positive electrode 102 and the negative electrode 104, a clearance 226-1 may be provided between an end of the first segment 106 that faces a folded portion between the third segment 110 and the fourth segment 112 and the folded portion between the third segment 110 and the fourth segment 112. Similarly, a clearance 226-2 may be is provided between an end of the third segment 110 that faces a folded portion between the first segment 106 and the second segment 108 and the folded portion between the first segment 106 and the second segment 108. Upon the arrangement of the positive electrode 102 and the negative electrode 104 inside the cell 100, the clearance 226-1 , 226-2 may be occupied by the separators. For instance, when the positive electrode 102 and the second electrode 104 are folded and compressed along the separators 218, the separators 218 may occupy the clearance 226-1 , 226-2.

[0041] In some examples, an extension portion may be provided when the positive electrode 102 and the negative electrode 104 are folded. For instance, an extension portion 230-1 may be provided between the first segment 106 and the second segment 108 and an extension portion 230-2 may be provided between the third segment 110 and the fourth segment 112. Accordingly, as the positive electrode 102 and the negative electrode 104 are arranged between the upper end-casing 116 (not shown in Fig. 2a) and the lower end-casing 114 (not shown in Fig. 2a), along with the separator 218, the upper end-casing 116 and the lower end-casing 114 may be compressed to form the cell 100. In such examples, the extension portion 230-1 , 230-2 may have a V-shape, a U- shape or any other shape.

[0042] In other examples, the extension portion may not be provided when the positive electrode 102 and the negative electrode 104 are folded and compressed. In such examples, when the electrodes are folded and are compressed along with the separators 218, the folded portion between the segments of the positive electrode 102 and the folded portions between the segments of the negative electrode 104 may have a V-shape. For instance, the folded portion between the first segment 106 and the second segment 108 may have a V-shape. Similarly, the folded portion between the third segment 110 and the fourth segment 112 may have a V-shape. However, when the electrodes are folded and compressed, the folded portion between segments of the positive electrode 102 and the folded portion between the segments of the negative electrode 104 may have a U-shape or another shape. Accordingly, in the present subject matter, since the positive electrode 102 and the negative electrode 104 do not have the extension portions 230-1 and 230-2, the utilization of space inside the cell 100 is maximized.

[0043] Fig. 2b illustrates a top view of the positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter. In an example, a diameter of segments of the positive electrode 102 and a diameter of segments of the negative electrode 104 may be selected such that the utilization of space inside the cell 100 is maximized. The dimensions of the positive electrode 102 may be substantially same as the dimensions of the end-casings 114, 116. Further, to prevent the electrical contact between the positive electrode 102 and the negative electrode 104, a diameter of a separator 218 (depicted by dotted lines) may be selected to be higher than that of the diameter of segments of the positive electrode 102 and of the diameter of the segments of the negative electrode 104.

[0044] Fig. 3 illustrates the positive electrode 102, in accordance with an implementation of the present subject matter. Here, the positive electrode 102 is depicted in an unfolded state. As will be understood, in the unfolded state, the first side 202 (not shown in Fig. 3), and the fourth side 208 (not shown in Fig.3) may be part of a first side of the positive electrode 102. Similarly, the second side 204, and the third side 206 may be part of a side 300 opposite the first side of the positive electrode 102. In the view depicted herein, the first side of the positive electrode 102 may be behind the side 300 of the positive electrode 102. In an example, each segment of the positive electrode 102 may have a shape substantially like a circle. However, in each segment, a portion of the circle, such as a circular segment, may be absent. To illustrate that a portion of the circle is absent in a segment of the positive electrode 102, such a portion is marked in dotted lines in each segment. For instance, the portion 302 may depict a portion of the circle that is absent in the first segment 106 and the portion 304 may depict a portion of the circle that is absent in the second segment 108. Accordingly, each segment of the positive electrode 102 may be referred to as having a shape of a circle devoid of a circular segment. In an example, the first electrode 102 may have a preformed shape with a plurality of segments, where each segment of the positive electrode 102 may have a shape devoid of the circular segment. Accordingly, a cutting operation (to cut a portion from the segment of the positive electrode 102) and a joining operation (to join the segments), may be eliminated. The portions of the first segment 106 and the second segment 108, where the circular segments are absent, form a boundary 306 between the segments. The boundary 306 may be referred to as a first boundary. As will be understood, in the view depicted herein, the positive electrode 102 may be folded about the first boundary 306 in the clockwise direction, depicted by the arrow 308, such that the first segment 106 may lie on top of the second segment 108 upon folding. The folding of the positive electrode 102 may be such that the first segment 106 may be inclined at an angle relative to the second segment 108. The angle of inclination may be, for example, an angle between 0° and 90°. Further, the folding of the positive electrode 102 at the first boundary 306 may ensure that there is no extension portion between the segments of the positive electrode 102 and the segments of the negative electrode 104 when they are folded. In the folded state, the alignment of the first segment 106 may be such that an unfolded end of the first segment 106 may match with an unfolded end of the second segment 108.

[0045] Further, each segment of the positive electrode 102 may be of same dimensions. For instance, a diameter and a thickness of the first segment 106 may be same as that of a diameter and a thickness of the second segment 108.

[0046] Although in the figure depicted herein, the electrode is being explained with reference to the positive electrode 102, in some examples, the electrode may be explained with reference with the negative electrode 104 (not shown in Fig. 3). In such examples, each segment of the negative electrode 104 may have a shape same as that of the segments of the positive electrode 102. For instance, the third segment 110 (not shown in Fig. 3) and the fourth segment 112 (not shown in Fig. 3) may have a shape of a circle devoid of a circular segment. Similar to the positive electrode 102, the negative electrode 104 may have a preformed shape with the third segment 110 and the fourth segment 112. Accordingly, the portions of the third segment 110 and the fourth segment 112, where the circular segments are absent, form a boundary. The boundary may be referred to as the second boundary (not shown in Fig. 3). The negative electrode 104 may be folded about the second boundary, such that the fourth segment 112 may lie on top of the third segment 110. In the unfolded state, the fifth side 210 (not shown in Fig. 3), and the eighth side 216 (not shown in Fig. 3) may be part of a first side of the negative electrode 104. Similarly, the sixth side 212 (not shown in Fig. 3), and the seventh side 216 (not shown in Fig. 3) may be part of a side opposite the first side of the negative electrode 104. Further, in an example, the negative electrode 104 may be folded such that the third segment 110 may be inclined at an angle, such as an angle between 0° and 90°, relative to the fourth segment 112. Further, the dimensions of the segments of the negative electrode 104 may be same as that of the segments of the positive electrode 102. For instance, a diameter and a thickness of the third segment 110, and a diameter and a thickness of the fourth segment 112 may be same as that of the diameter and the thickness of the first segment 106.

[0047] Fig. 4 illustrates the separator 218 to be interposed between the positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter. As will be understood, in the view depicted herein, a side of the negative electrode 104 (not shown in Fig. 4) may be disposed above the separator 218 and a side of the positive electrode 102 (not shown in Fig. 4) may be disposed below the separator 218.

[0048] The separator 218 may have a shape adapted to the shapes of the segments of positive electrode 102 and the segments of the negative electrode 104, such that the separator 218 is able to be disposed between the entire side of the positive electrode 102 and the entire side of the negative electrode 104 that faces each other. In this regard, since the positive electrode 102 and the negative electrode 104 may have substantially circular shape, the separator 218 may have substantially circular shape. In an example, a portion of circle, such as a circular segment, may be absent at an end 402 and at an end 404 of the separator 218. Accordingly, the separator 218 may have a shape of a circle devoid of two circular segments. The separator may be aligned in such a way that the end 402 and the end 404 matches with the edges of the segments. For instance, the end 402 may match with the boundary 306 and the end 404 may be match with the unfolded end of the first segment 106 and with the unfolded end of the second segment 108.

[0049] As mentioned earlier, the positive electrode 102 and the negative electrode 104 may have a coating of the first active material and the second active material to increase the electrical capacity and the energy density of the cell 100, the coating will be explained below: [0050] Fig. 5 illustrates selectively coated positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter.

[0051] During operation of the cell 100, to collect the electrons flowing through the external circuit, the positive electrode 102 may comprise a current collector (referred to hereinafter as “first current collector”) 502 and the negative electrode 104 may comprise a current collector 504 (referred to hereinafter as “second current collector”). The first current collector 502 may be, for example, an aluminium. The second current collector 504 may be, for example, a copper. The first current collector 502 and the second current collector 504 may be provided in form of a foil.

[0052] The positive electrode 102 may further include, an active material (referred to hereinafter as “first active material”). The first active material may be provided as a coating on the first current collector 502. The first active material may act as a source of Li-ions that may flow between the positive electrode 102 and the negative electrode 104 during the charging cycle of the Li-ion cell 100. The first active material may be, for example, selected from Lithium cobalt oxide (UC0O2), Lithium Manganese Oxide (LiMnO^, Lithium Nickel Manganese Cobalt oxide (LiNiMnCo0₂), Lithium Nickel Cobalt Aluminum Oxide (LiNiCoAI0₂), Lithium Iron Phosphate (LiFeP0₄) Lithium-sulfur (LiS) or any combinations thereof.

[0053] Similarly, the negative electrode 104 may include an active material (referred to hereinafter as “second active material”). The second active material may be provided as a coating on the second current collector 504. The second active material may act as the source of Li-ions, which may flow from the negative electrode 104 to the positive electrode 102 during the discharge cycle of the cell 100. The second active material may be, for example, selected from graphite, hard carbon, carbon nanotube powder or Lithium Titanate (Li₂Ti0₃), silicon with carbon or Li metal or any combinations thereof.

[0054] Accordingly, the flow of Li-ions between the positive electrode 102 and the negative electrode 104 may be facilitated by the coating of the first active material and the coating of the second active material. The overlapping region is formed when a side of the positive electrode 102 having a coating of the first active material faces a side of the negative electrode 104 having a coating of the second active material.

[0055] While providing a coating of the active material on the positive electrode 102 and the negative electrode 104 may facilitate increase in the flow of Li-ions, such a coating may also increase the thickness of the corresponding electrode. Accordingly, in the present subject matter, the coating may be provided on some sides of some segments and may not be provided on some other sides of the electrodes. The provision of coating on some sides and not on some other sides may be referred to as selective coating.

[0056] In an example, a segment that faces a segment of the negative electrode 104 on both its opposite sides may be provided with a coating of the first active material. Similarly, a segment of the negative electrode 104 that faces a segment of the positive electrode 102 on both its opposite sides may be coated with a second active material. Particularly, an end segment of an electrode that is away from the corresponding terminal of the cell 100 may face a segment of the electrode of another polarity on both its opposite sides. Accordingly, the end segment may have a coating on both its sides. For instance, the first segment 106, which is away from the positive terminal 114 of the cell 100, faces the third segment 110 and the fourth segment 112 on both its opposite sides and is coated on both its opposite sides with the first active material. Similarly, the third segment 110, which is away from the negative terminal 116, faces the first segment 106 and the second segment 108 on both its opposite sides and is coated on both its opposite sides with the negative active material.

[0057] In this regard, the first side 202, the second side 204, and the third side 206 may be coated with the first active material, which is depicted by a hatched pattern. Further, the fourth side 208 may have no coating. This is because the fourth side 208 may be connected to the positive terminal 114 (not shown in Fig. 5) and a coating on the fourth side 208 may impede the flow of electrons between the positive terminal 114 and the positive electrode 102. Since the first current collector 502 is made of aluminium, the first current collector 502 may facilitate high electrical conductivity between the positive terminal 114 and the fourth side 208. Further, since the fourth side 208 does not face any segment of the negative electrode 104, providing coating on the fourth side 208 may not facilitate chemical reaction at the fourth side 208. Accordingly, the coating on the fourth side 208 may not increase the energy density of the cell 100. By providing no coating on the fourth side 208, the increase in thickness of the positive electrode 102 may be prevented. Further, the fourth side 208 may have the current collector connected to the positive terminal of the cell 100, which may facilitate the flow of electrons from the positive electrode to the positive terminal of the cell 100.

[0058] Similarly, the fifth side 210, the sixth side 212, the seventh side 214 may have a coating of the second active material, which is depicted by a cross-hatch pattern. The eighth side 216 may have no coating. This is because the eighth side 216 is connected to the negative terminal 116 and a coating on the eighth side 216 may thwart the flow of electrons between the negative electrode 104 and the negative terminal 116. Further, no coating of the second active material on the eighth side 216 may ensure that the current collector is connected to the negative terminal of the cell 100, which may facilitate the flow of electrons from the negative electrode 104 to the negative terminal 116 of the cell 100. Since the second current collector 504 is made of copper, the second current collector 504 may facilitate high electrical conductivity between the negative terminal 116 and the eighth side 216. The eighth side 216 does not face any segment of the positive electrode 102 and providing coating on the eighth side 216 may not facilitate chemical reaction at the eighth side 216. Accordingly, the coating on the eighth side 216 may not increase the energy density of the cell 100. By providing no coating to the eighth side 216, the increase in thickness of the negative electrode 104 may be prevented. [0059] In the above example, due to the coating of the first side 202 with the first active material and the seventh side 214 with the second active material, the Li-ions may flow between the seventh side 214 and the first side 202. Similarly, due to the coating of the first active material on the second side 204 and the coating of the second active material on the sixth side 212, the Li-ions may flow between the second side 204 and the sixth side 212. Due to the coating of the first active material on the third side 206 and the coating of the second active material on the fifth sided 210, the Li-ions may flow between the third side 206 and the fifth side 210. Accordingly, the number of overlapping regions may be three. [0060] In the present subject matter, only the segments of an electrode that required to be coated on both its opposite sides, i.e., the segments which face a segment on both its opposite sides are coated with the corresponding active material on both its opposite sides and the segments which do not require to be coated on both its opposite sides are not coated with the corresponding active material. Therefore, the present subject matter prevents the use of excess active material that may not be used during operation of the cell 100, which may decrease the size of the electrodes. [0061] In some examples, the number of overlapping regions may be increased by increasing the number of segments of an electrode, as will be described below.

[0062] Fig. 6 illustrates a selectively coated positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter.

[0063] In an example, the number of the segments may be determined depending on the number of overlapping regions required. As the number of overlapping regions is increased, the electrical capacity of the cell 100 may be increased.

[0064] In this regard, to increase the number of overlapping regions, the positive electrode 102 may include one or more segments, such as a fifth segment 602 and a sixth segment 604, in addition to the first segment 106 and the second segment 108. The fifth segment 602 and the sixth segment 604 may be disposed between the first segment 106 and the second segment 108. For instance, the fifth segment 602 may be disposed adjacent to the first segment 106 and the sixth segment 604 may be disposed adjacent to the second segment 108. In particular, an end of the fifth segment 602 may be connected to the first segment 106 and another end of the fifth segment 602 may be connected to an end of the sixth segment 604. Further, another end of the sixth segment 604 may be connected to the second segment 108. In a folded state, the positive electrode 102 may, for example, have a zigzag structure. Accordingly, in the folded state, each segment of the positive electrode 102 may be inclined at an angle, such as an angle between 0° and 90°, relative to an adjacent segment of the positive electrode 102.

[0065] Similarly, in addition to the third segment 110 and the fourth segment 112, the negative electrode 104 may include a seventh segment 614 and an eighth segment 616, which may be disposed between the third segment 110 and the fourth segment 112. For instance, the seventh segment 614 may be disposed adjacent to the third segment 110 and the eighth segment 616 may be disposed adjacent to the fourth segment 112. In particular, an end of the seventh segment 614 may be connected to the third segment 110 and another end of the seventh segment 614 may be connected to an end of the eighth segment 616. Further, another end of the eighth segment 616 may be connected to the fourth segment 112. In a folded state, the negative electrode 104 may, for example, have a zigzag structure. Accordingly, a segment of the negative electrode 104 may be inclined at an angle, such as an angle between 0° and 90°, relative to an adjacent segment of the negative electrode 104. The folding of the positive electrode 102 and the negative electrode 104 as zigzag structures may facilitate assembling them such that a segment of the positive electrode 102 faces a segment of the negative electrode 104.

[0066] The fifth segment 602 may have a ninth side 606 and a tenth side 608. The ninth side 606 may be opposite the tenth side 608. The sixth segment 604 may have an eleventh side 610 and a twelfth side 612. The twelfth side 612 may be opposite the eleventh side 610. The seventh segment 614 may have a thirteenth side 618 and a fourteenth side 620. The fourteenth side 620 may be opposite the thirteenth side 618. The eighth segment 616 may have a fifteenth side 622 and a sixteenth side 624. The sixteenth side 624 may be opposite the fifteenth side 622.

[0067] In an example, the positive electrode 102 and the negative electrode 104 may be arranged as follows:

[0068] The ninth side 606 may face the thirteenth side 618, the tenth side 608 may face no segment of the negative electrode 104. The eleventh side 610 may face the sixth side 212. The twelfth side 612 faces no segment of the negative electrode 104. The fourteenth side 620 faces no segment of the positive electrode 102.

[0069] In the view depicted herein, the sides of the positive electrode 102 and the sides of the negative electrode 104, which are to face each other, are shown wide apart. However, in an assembled state of the cell 100 i.e., upon crimping of the end-casings 114, 116 (not shown in Fig. 6), the above-mentioned sides of the positive electrode 102 and the sides of the negative electrode 104 may face each other.

[0070] Further, to increase the number of overlapping regions, the sides, such as the ninth side 606 and the eleventh side 610 may have a coating of the first active material and the sides, such as the thirteenth side 618 and the fifteenth side 622 may have a coating of the second active material. Further, the sides, such as the tenth side 608, the twelfth side 612, the fourteenth side 620, and the sixteenth side 624 may be uncoated.

[0071] Due to the aforementioned arrangement of the positive electrode 102 and the negative electrode 104, and due to the aforementioned selective coating, the Li-ions, in an example, may flow between the first side 202 and the seventh side 214, between the second side 204 and fifteenth side 622, between the ninth side 606 and the thirteenth side 618, between the eleventh side 610 and the sixth side 212, and between the third side 206 and the fifth side 210. Accordingly, the number of overlapping regions may be five. Although the number of overlapping regions is increased, the thickness of the positive electrode 102 and the thickness of the negative electrode 104 may be less than that of examples, in which each segment of the positive electrode 102 and each segment of the negative electrode 104 may have a coating of the corresponding active material on both their sides.

[0072] As mentioned earlier, the number of separators 218 may be equal to the number of overlapping regions. Since the number of overlapping regions is five, five separators 218 may be used. For instance, the first separator 218-1 may be interposed between the first side 202 and the seventh side 214, the second separator 218-2 between the second side 204 and the fifteenth side 622, the third separator 218-3 between the ninth side 606 and the thirteenth side 618, a fourth separator 626-1 between the eleventh side 610 and the sixth side 212, a fifth separator 626-2 between the third side 206 and the fifth side 210.

[0073] Fig. 7 illustrates a top view of the positive electrode 102, in accordance with an implementation of the present subject matter. Here the positive electrode 102 is depicted in an unfolded state.

[0074] Two adjacent segments of the positive electrode 102 may joined to form a boundary. For instance, the fifth segment 602 and the first segment 106 may be joined at the boundary 702-1 , the fifth segment 602 may be joined with the sixth segment 604 to form a boundary 702-2, and the sixth segment 604 may be joined with the second segment 108 to form a boundary 702-3 As mentioned earlier, the positive electrode 102 may be folded at each boundary.

[0075] Due to the sharing of a boundary between two adjacent segments of the positive electrode 102, when the positive electrode 102 is folded, formation of extension portions, which occupy space inside the cell 100, may be prevented. Therefore, the utilization of space inside the cell 100 is increased.

[0076] Although the electrode shown in the figure depicted herein is explained with reference to the positive electrode 102, the figure may be explained with reference to the negative electrode 104 as well.

[0077] In some examples, based on the required electrical capacity from the cell 100, the number of overlapping regions may be decreased by providing no coating on one or more sides of the positive electrode 102 and the negative electrode 104.

[0078] Fig. 8 illustrates selectively coated positive electrode 102 and the negative electrode 104, in accordance with an implementation of the present subject matter. [0079] As mentioned earlier, the present subject matter increases the number of overlapping regions to increase the electrical capacity of the cell 100. In some cases, for a given number of segments, the number of overlapping regions may be decreased to cater to various electrical capacity requirements. To decrease the number of overlapping regions for a given number of segments, some of the segments, such as an end segment of an electrode, may be uncoated. Retaining sides of the end segments without a coating rather than retaining sides of the segments between the end segments without a coating may simplify the production of the electrodes.

[0080] Accordingly, in an example, as depicted herein, the third side 206 and the fifth side 210 may be uncoated. As a result, there may not be flow of Li-ions between the third side 206 and the fifth side 210. Further, the ninth side 606, and the eleventh side 610 may have a coating of the first active material, the thirteenth side 618, and the fifteenth side 622 may have a coating of the second active material. Furthermore, the tenth side 608, the twelfth side 612, the fourteenth side 620 and the sixteenth side 624 may have no coating. In such an example, the number of overlapping regions may be 4. [0081] Although in the above examples, the first electrode 102 is explained with reference to positive electrode and the second electrode 104 is explained with reference to negative electrode, in some examples, the first electrode may be a negative electrode and the second electrode may be a positive electrode. Also, in such examples, the first terminal 114 may be a negative terminal and the second terminal 116 may be a positive terminal.

[0082] Fig. 9 illustrates a method 900 for manufacturing a coin-type Li-ion cell, in accordance with an implementation of the present subject matter. [0083] The order in which the method blocks are described is not included to be construed as a limitation, and some of the described method blocks can be combined in any order to implement the method 900, or an alternative method. Additionally, some of the individual blocks may be deleted from the method 900 without departing from the scope of the subject matter described herein.

[0084] At block 902, portions of a first electrode of the cell may be selectively coated. The cell may correspond to the cell 100. The first electrode may correspond to the first electrode 102. The first electrode may have a first polarity. For instance, the first electrode may be a positive electrode. The first electrode may have a first segment and a second segment. The first segment and the second segment may, for example, have a shape of a circle devoid of a circular segment. The first segment may have a first side and a second side. The second side may be opposite the first side. The first segment may correspond to the first segment 106, the first side may correspond to the first side 202, and the second side may correspond to the second side 204. Further, the second segment may have a third side and a fourth side. The fourth side may be opposite the third side. The second segment may correspond to the second segment 108, the third side may correspond to the third side 206, and the fourth side may correspond to the fourth side 208. In an example, the first side and the fourth side may be a part of a first side of the first electrode and the second side, and the third side may be a part of a side opposite the first side of the first electrode.

[0085] In an example, the first electrode may be selectively coated such that first side, the second side, and the third side may be coated with a first active material, and the fourth side may be retained without the coating of the first active material.

[0086] At block 904, the first electrode may be folded such that the first segment may be inclined at an angle relative to the second segment. The angle may be, for example, an angle between 0° and 90°. Accordingly, in an example, in a folded state, the first electrode may have a zigzag structure.

[0087] At block 906, the first electrode may be disposed relative to a second electrode such that each of the first side and the second side may face a segment of the second electrode, the third side may face a segment of the second electrode and the fourth side may face no segment of the second electrode. For instance, the folding of the first electrode to have a zigzag structure may facilitate such disposition of the first electrode relative to the second electrode. The second electrode may, for example, have a second polarity. For instance, the second electrode may be a negative electrode. The second electrode may correspond to the second electrode 104.

[0088] In an example, the method 900 may further include selective coating of the second electrode. The second electrode may comprise a third segment and a fourth segment. The third segment and the fourth segment may, for example, have a shape of a circle devoid of a circular segment. The third segment may comprise a fifth side and a sixth side opposite the fifth side. The third segment may correspond to the third segment 110, the fifth side may correspond to the fifth side 210, the sixth side ay correspond to the sixth side 212. The fourth segment may comprise a seventh side and an eighth side opposite the seventh side. The fourth segment may correspond to the fourth segment 112, the seventh side may correspond to the seventh side 214, and the eighth side may correspond to the eighth side 216. The fifth side and the eighth side may be part of a first side of the second electrode, and the sixth side, and the seventh side may be a part of a side opposite the first side of the second electrode.

[0089] The second electrode may be folded such that the third segment is inclined at an angle relative to the fourth segment. The angle may be, for example, an angle between 0° and 90°. Accordingly, in an example, in a folded state, the second electrode may have a zigzag structure.

[0090] Upon folding of the second electrode, the first electrode may be disposed relative to the second electrode such that the first side may face the seventh side, the second side may face a segment of the second electrode, and the third side may face the fifth side, and the eighth side may face no segment of the first electrode. In an example, the second side may face the sixth side. The folding of the first electrode and the folding of the second electrode to have a zigzag structure may facilitate such disposition of the first electrode relative to the second electrode.

[0091] Furthermore, a first separator of the cell may be interposed between the first side and the seventh side. A second separator of the cell may be interposed between the second side and the sixth side. A third separator may be interposed between the third side and the fifth side. The first separator may correspond to the first separator 218-1 , the second separator may correspond to the second separator 218-2, and the third separator may correspond to the third separator 218-3. Furthermore, the first electrode, the second electrode, the separators, such as the first separator, the second separator, and the third separator may be compressed together to form an electrode assembly.

[0092] Although, in the method 900, the first electrode and the second electrode are explained as being folded to have two segments each, in some examples, the first electrode and the second electrode may have a plurality of segments, as explained earlier with reference to Fig. 6, Fig. 7, and Fig. 8. Accordingly, the arrangement and the selective coating of the first electrode and the second electrode may be same as the arrangement and the selective coating as explained with reference to Fig. 6, Fig. 7, and Fig. 8. [0093] The present subject matter, by increasing the number of overlapping regions, increases the energy density and the electrical capacity of coin-type Li-ion cells with a simple arrangement of a positive electrode and a negative electrode. Further, since the present subject matter uses selective coating of electrode segments, the present subject matter prevents use of excess active materials in the cells and reduces the increase of weight of the cells occurring due to such usage. Furthermore, in the present subject matter, the positive electrode and the negative electrode are connected to the terminals of the cell directly through an uncoated side of the electrode, such as through an uncoated side of the first segment (i.e., fourth side) of positive electrode and an uncoated side of the fourth segment (i.e., eighth side) of negative electrode. Accordingly, the present subject matter prevents use of additional components, such as contact tabs, which may occupy some amount of space inside the cells. Also, the present subject matter prevents the use of supplementary portion at the folded ends. Therefore, the present subject matter facilitates maximizes utilization of space inside the cells to increase the electrical capacity of the cell.

[0094] Although the present subject matter has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the subject matter, will become apparent to persons skilled in the art upon reference to the description of the subject matter.

Claims

I/We Claim:

1. A coin-type Lithium (Li)-ion cell (100) comprising: a first electrode (102) with a first polarity and comprising a first segment (106) and a second segment (108), wherein the first segment (106) comprises: a first side (202); and a second side (204) opposite the first side (202), and wherein the second segment (108) comprises: a third side (206); and a fourth side (208) opposite the third side (206); and a second electrode (104) with a second polarity and comprising a plurality of segments, wherein each of the first side (202) and the second side (204) faces a segment of the second electrode (104), each of the first side (202) and the second side (204) has a coating of a first active material, the third side (206) faces a segment of the second electrode (104) and the fourth side (208) faces no segment of the second electrode (104), the third side (206) has one of: coating of the first active material and no coating, and the fourth side (208) has no coating.

2. The coin-type Li-ion cell (100) as claimed in claim 1 , wherein the second electrode (104) comprises: a third segment (110) having a fifth side (210) and a sixth side (212) opposite the fifth side (210); and a fourth segment (112) having a seventh side (214) and an eighth side (216) opposite the seventh side (214), wherein the fifth side (210) faces the third side (206), the sixth side (212) faces a segment of the first electrode (102) and has a coating of a second active material, the seventh side (214) faces the first side (202) and has a coating of the second active material, the eighth side (216) faces no segment of the first electrode (102) and is uncoated.

3. The coin-type Li-ion cell (100) as claimed in claim 2, wherein the sixth side (212) faces the second side (204) and wherein the coin-type Li- ion cell (100) comprises: a first separator (218-1) interposed between the first side (202) and the seventh side (214); a second separator (218-2) interposed between the second side (204) and the sixth side (212); and a third separator (218-3) interposed between the third side (206) and the fifth side (210).

4. The coin-type Li-ion cell (210) as claimed in claim 3, wherein each segment of the first electrode (102) and each segment of the second electrode (104) has a shape of a circle devoid of a circular segment, wherein each of the first separator (218-1), the second separator (218-2), and the third separator (218-3) have a shape of a circle devoid of a circular segment.

5. The coin-type Li-ion cell (100) as claimed in claim 2, wherein the third side (206) and the fifth side (210) are uncoated.

6. The coin-type Li-ion cell (100) as claimed in claim 5, comprising: a first terminal (114) of the first polarity; a second terminal (116) of the second polarity, wherein the first electrode (102) further comprises: a fifth segment (602) and a sixth segment (604) between the first segment (106) and the second segment (108), wherein the second electrode (104) further comprises: a seventh segment (614) and an eighth segment (616) between the third segment (110) and the fourth segment (112), wherein the first terminal (114) is connected to the first electrode (102) through the fourth side (208) and wherein the second terminal (116) is connected to the second electrode (104) through the eighth side (216).

The coin-type Li-ion cell (100) as claimed in claim 6, wherein: the fifth segment (602) has a ninth side (606) and a tenth side (608) opposite the ninth side (606), the sixth segment (604) has an eleventh side (610) and a twelfth side (612) opposite the eleventh side (610), the seventh segment (614) has a thirteenth side (618) and a fourteenth side (620) opposite the thirteenth side (618), the eighth segment (616) has a fifteenth side (622) and a sixteenth side (624) opposite the fifteenth side (622), the ninth side (606) faces the thirteenth side (618) and has a coating of the first active material, the tenth side (608) faces no segment of the second electrode (104) and is uncoated the eleventh side (610) faces the sixth side (212) and has a coating of the first active material, the twelfth side (612) faces no segment of the second electrode (104) and is uncoated, the thirteenth side (618) has a coating of the second active material, the fourteenth side (620) faces no segment of the first electrode (102) and is uncoated, the fifteenth side (622) faces the second side (204) and has a coating of the second active material, and the sixteenth side (624) faces no segment of the first electrode

(102) and is uncoated.

8. The coin-type Li-ion cell (100) as claimed in claim 2, wherein the third side (206) has a coating of the first active material and wherein the fifth side (210) has a coating of the second active material. 9. The coin-type Li-ion cell (100) as claimed in claim 8, comprising: a first terminal (114) of the first polarity; a second terminal (116) of the second polarity, wherein the first electrode (102) further comprises: a fifth segment (602) and a sixth segment (604) between the first segment (106) and the second segment (108), wherein the second electrode (104) further comprises: a seventh segment (614) and an eighth segment (616) between the third segment (110) and the fourth segment (112), wherein the first terminal (114) is connected to the first electrode (102) through the fourth side (208) and wherein the second terminal (116) is connected to the second electrode (104) through the eighth side (216).

10. The coin-type Li-ion cell (100) as claimed in claim 9, wherein: the fifth segment (602) has a ninth side (606) and a tenth side

(608) opposite the ninth side (606), the sixth segment (604) has an eleventh side (610) and a twelfth side (612) opposite the eleventh side (610), the seventh segment (614) has a thirteenth side (618) and a fourteenth side (620) opposite the thirteenth side (618), the eighth segment (616) has a fifteenth side (622) and a sixteenth side (624) opposite the fifteenth side (622), the ninth side (606) faces the thirteenth side (618) and has a coating of the first active material, the tenth side (608) faces no segment of the second electrode (104) and is uncoated the eleventh side (610) faces the sixth side (212) and has a coating of the first active material, the twelfth side (612) faces no segment of the second electrode (104) and is uncoated, the thirteenth side (618) has a coating of the second active material, the fourteenth side (620) faces no segment of the first electrode (102) and is uncoated, the fifteenth side (622) faces the second side (204) and has a coating of the second active material, and the sixteenth side (624) faces no segment of the first electrode (102) and is uncoated.

11. A method for manufacturing a coin-type Lithium (Li)-ion cell (cell) (100), the method comprising: selectively coating portions of a first electrode (102) of the cell (100), wherein the first electrode (102) has a first polarity, wherein the first electrode (102) comprises a first segment (106) and a second segment (108), wherein the first segment (106) comprises a first side (202) and a second side (204) opposite the first side (202), wherein the second segment (108) comprises a third side (206) and a fourth side (208) opposite the third side (206), wherein the first side (202) and the fourth side (208) are part of a first side of the first electrode 102, wherein the second side (204) and the third side (206) are part of a side opposite the first side of the first electrode (102), wherein the selectively coating comprises coating the first side (202), the second side (204), and the third side (206) with a first active material, and retaining the fourth side (208) without the coating of the first active material; folding the first electrode (102) of the cell (100) such that the first segment (106) is inclined at an angle relative to the second segment (108); and disposing the first electrode (102) relative to a second electrode (104) of the cell (100) such that each of the first side (202) and the second side (204) faces a segment of the second electrode (104), the third side (206) faces a segment of the second electrode (104) and the fourth side (208) faces no segment of the second electrode (104), wherein second electrode (104) has a second polarity.

The method as claimed in claim 11 , comprising: selectively coating portions of the second electrode (104), wherein the second electrode (104) comprises a third segment (110) and a fourth segment (110), wherein the third segment (110) comprises a fifth side (210) and a sixth side (212) opposite the fifth side (210), wherein the fourth segment (112) comprises a seventh side (214) and an eighth side (216) opposite the seventh side (214), wherein the fifth side (210) and the eighth side (216) are part of a first side of the second electrode (104), and wherein the sixth side (212) and the seventh side (214) are part of a side opposite the first side of the second electrode (104), wherein the selectively coating comprises coating the fifth side (210), the sixth side (212), and the seventh side (214) with a second active material, and retaining the eighth side (216) without the coating of the second active material; folding the second electrode (104) of the cell (100) such that the third segment (110) is inclined at an angle relative to the fourth segment (112); and disposing the first electrode (102) relative to the second electrode (104) such that the first side (202) faces the seventh side

(214), the second side (204) faces a segment of the first electrode (102), and the third side (206) faces the fifth side (210), and the eighth side (216) faces no segment of the first electrode (102).

13. The method as claimed in claim 12, wherein the second side (204) faces the sixth side (212), wherein the method comprises: interposing a first separator (218-1) of the cell (100) between the first side (202) and the seventh side (214), a second separator (218-2) of the cell (100) between the second side and the sixth side (212), and a third separator (218-3) of the cell between the third side and the fifth side (210); and compressing the first electrode, the second electrode, the first separator (218-1), the second separator (218-2), and the third separator (218-3) together to obtain an electrode assembly.