KR101827264B1 - Co-planar type secondary battery made by using same collector in anode and cathode and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a coplanar secondary battery in which a positive electrode and a negative electrode are the same current collector, and a method of manufacturing the same. More particularly, the present invention relates to a coplanar secondary battery having a negative electrode having a plurality of rod- And a cathode in which a cathode material is coated with a cathode material and in which a plurality of bar-shaped parallel protrusions are formed, and a plurality of parallel protrusions formed on the anode and the cathode are alternately provided And more particularly, to a coplanar secondary battery which is a current collector and a method for manufacturing the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coplanar secondary battery having a positive electrode and a negative electrode,

The present invention relates to a flexible secondary battery in which the positive electrode and the negative electrode are the same current collector and the positive electrode and the negative electrode exist in the same plane, and a method for manufacturing the same.

Conventionally, in the case of a flexible secondary battery, the electrode material is coated on a carbon material base such as a porous carbon material of a 3D structure, a carbon nanotube, and a carbon fiber textile, or the collector material may be used in a flexible substrate, And a method in which an electrode material is deposited is mainly used. However, in the case of the conventional technology, a complicated process is performed or a manufacturing cost is high.

In addition, the thickness is also an important factor for devices requiring a flexible secondary battery. Therefore, a thin secondary battery with a thin thickness is required. However, the present secondary battery system is based on lamination structure of anode, separator, and cathode in order to give different stresses between the respective gaps, thereby causing defects between battery components.

The design of the voltage and the capacity according to the connection between the secondary cells should be freely adapted to various devices. In addition, in the case of devices requiring most flexible secondary batteries, there are many portable devices, so a fast charging speed and a high capacity battery performance are required. However, there are many deficiencies in the prior art.

Therefore, in order to overcome such a problem, there is a need for a flexible secondary battery system of a structure which is free of design, has a thin thickness and can withstand stress.

Prior art related to this is a flexible secondary battery disclosed in Korean Patent Laid-Open Publication No. 10-2015-0084242 (published on Jul. 22, 2015) and a manufacturing method thereof.

Accordingly, the present invention is to provide a coplanar secondary battery in which a positive electrode and a negative electrode are the same current, which are free of design, thin in thickness, and not deformed by high stress, and a method of manufacturing the same.

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention provides a negative electrode comprising: a negative electrode coated with a negative electrode material on an aluminum current collector and having a plurality of bar-shaped parallel protrusions; And a cathode in which a cathode material is coated with a cathode material and in which a plurality of bar-shaped parallel protrusions are formed, and a plurality of parallel protrusions formed on the anode and the cathode are alternately provided The present invention provides a coplanar secondary battery which is a current collector.

In addition, the present invention relates to a method for manufacturing a negative electrode, which comprises mixing an anode precursor and high-energy ball milling it to prepare an anode material by a solid-phase synthesis method, Mixing the cathode precursor and high-energy ball milling to prepare a cathode material by a solid-phase synthesis method, and applying the cathode material to an aluminum foil to prepare a cathode; And a step of punching the negative electrode and the positive electrode to produce a plurality of rod-like projections, and then attaching the projections on the pouch such that a plurality of projections formed on the negative electrode and the positive electrode are alternately provided. A method of manufacturing a planar secondary battery is provided.

According to the present invention, an aluminum current collector having the same cathode and anode can be used without using current collectors such as copper and nickel, which are conventionally used for a cathode, and the manufacturing cost can be greatly reduced. And the battery can be manufactured in a printed form by using the same collector as the cathode and the anode.

In addition, since the positive electrode and the negative electrode are on the same plane, the secondary battery according to the present invention has less stress than the lamination type (positive electrode-separator-negative electrode) structure and can greatly reduce the thickness of the battery, Can be produced.

1 is a schematic view showing a coplanar secondary battery in which a positive electrode and a negative electrode according to the present invention are the same current collector.
2 is a flowchart illustrating a method of manufacturing a coplanar secondary battery in which a positive electrode and a negative electrode are the same current collector according to the present invention.
3 is a photograph showing the interior of a coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention.
4 is a photograph showing a coplanar secondary battery in which a positive electrode and a negative electrode are the same current collector according to the present invention.
5 is a graph showing changes in voltage and capacitance due to a constant current discharge (0.1C) of a pouch-cell type coplanar type secondary battery in which the positive and negative electrodes are the same collector according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention provides a negative electrode comprising: a negative electrode coated with a negative electrode material on an aluminum current collector and having a plurality of bar-shaped parallel protrusions; And

And a cathode on which an anode current is applied to the aluminum current collector and in which a plurality of parallel protrusions in a rod shape are formed,

And a plurality of parallel protrusions formed on the negative electrode and the positive electrode are alternately provided. The present invention provides a coplanar type secondary battery in which the positive and negative electrodes are the same current collector.

The planar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention uses an aluminum current collector having the same cathode and anode without using current collectors such as copper and nickel commonly used in conventional cathodes, The process can be simplified in manufacturing the negative electrode and the positive electrode, and the battery can be manufactured in a printed form using the same collector as the negative electrode and the positive electrode. In addition, since the positive electrode and the negative electrode are on the same plane, the secondary battery according to the present invention has less stress than the lamination type (positive electrode-separator-negative electrode) structure and can greatly reduce the thickness of the battery, Can be produced.

1 is a schematic view showing a coplanar secondary battery in which a positive electrode and a negative electrode according to the present invention are the same current collector. 1, a coplanar secondary battery 100 in which a positive electrode and a negative electrode are the same collector according to the present invention includes a cathode 120 and an aluminum collector 120 on which an anode material 121 is coated, A plurality of rod-like protrusions are formed on the cathode 120 and the anode 130. The cathode 120 and the anode 130 are formed on the anode 120 and the anode 130, Like projections are alternately provided. That is, the anode 130 is positioned between the plurality of parallel cathodes 120. 1, in the coplanar type secondary battery according to an embodiment of the present invention, the width of the cathode 120 and the anode 130 is 2 mm, the distance between the cathode 120 and the anode 130 is 1 mm Respectively.

In the coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention, since the negative electrode material is formed on the aluminum current collector, only Li ₄ Ti ₅ O ₁₂ can be used, and the negative electrode material can be carbon coated.

In addition, the positive electrode material in the positive electrode and the negative electrode current collector is equal to the same planar secondary battery according to the present invention _{LiNi 0 .5 Mn 1 .5 O 4} , LiMn 2 O 4, LiCoO 2, LiFePo 4, LiCoPO 4, LiMnPo 4, _{LiV 3 O 8, V 2 O} 5, VO 2, Ti 2 P 2 O 7, LiNiO 2, LiNi 0 .5 Mn 0 .5 O 2, LiNi 0 .8 Co 0 .15 Al 0 .05 O 2, LiNi Co _0.33 Mn _0.33 O ₂ and _0.33 LiNi _{0 .5} Co _{0 .2} can be used one selected from the group consisting of Mn _{0 .3} O _2.

The secondary battery is a pouch type.

In addition, the present invention relates to a method for manufacturing a negative electrode, which comprises mixing an anode precursor and high-energy ball milling it to prepare an anode material by a solid-phase synthesis method,

Mixing the cathode precursor and high-energy ball milling to prepare a cathode material by a solid-phase synthesis method, and applying the cathode material to an aluminum foil to prepare a cathode; And

Forming a plurality of bar-like projections by punching the negative electrode and the positive electrode, and attaching the projections to the pouch such that a plurality of projections formed on the negative electrode and the positive electrode are alternately provided; A method of manufacturing a secondary battery is provided.

2 is a flowchart illustrating a method of manufacturing a coplanar secondary battery in which a positive electrode and a negative electrode are the same current collector according to the present invention. Hereinafter, the present invention will be described in detail with reference to Fig.

A method for manufacturing a coplanar secondary battery in which a cathode and a cathode are the same current collector according to the present invention includes the steps of mixing an anode precursor and high energy ball milling to prepare an anode material by a solid phase synthesis method and then coating the anode material on an aluminum foil S10 and a cathode precursor are mixed and subjected to high energy ball milling to prepare a cathode material by a solid phase synthesis method and then applied to an aluminum foil to produce a cathode (S20).

At this time, the anode precursor is Li ₂ CO ₃ and TiO ₂ , and the cathode precursor is at least two selected from the group consisting of Li ₂ NiO ₂ , MnO _2, Li ₂ CO ₃ , NiO and MnCO ₃ .

Next, a method for manufacturing a coplanar secondary battery in which a positive electrode and a negative electrode are the same current collector according to the present invention is characterized in that a plurality of projections having a rod shape are manufactured by punching the negative electrode and the positive electrode, (S30) of attaching them to the pouches so as to be alternately provided.

A plurality of protrusions formed on the negative electrode and the positive electrode are alternately provided, and the positive electrode and the negative electrode may be present on the same plane by being attached to the pouch. In this case, an anode is provided between cathodes formed by a plurality of bar-like protrusions, and an anode, a cathode, a cathode, and a cathode are disposed on the same plane in this order.

The method of manufacturing a coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention is characterized by mixing the negative electrode material with the organic additive to coat the negative electrode material with the organic additive, .

Example 1: Production of coplanar secondary battery in which the positive electrode and the negative electrode are the same collector 1

Cathode manufacture

Li ₂ CO ₃ and TiO ₂ were stoichiometrically mixed and ball milled for 12 hours. The ball milled mixture was made into a pellet shape by applying a pressure of 200 kg / cm 2 and then heat-treated at 850 ° C for 6 hours to prepare Li ₄ Ti ₅ O ₁₂ (LTO).

Anode manufacturing

Li ₂ CO ₃ , NiO and MnCO ₃ were mixed and then subjected to a high-energy ball milling in a solid-state reaction, followed by heat treatment at 900 ° C. for 24 hours to prepare LiNi _{0 .5} Mn _{1 .5} O ₄ (LNMO) Respectively.

Battery Manufacturing

The prepared LTO, carbon black (super P) and polyvinylidene fluoride (PVdF) were mixed at a weight ratio of 90: 5: 5, and then the mixture was cast in N-methyl-2-pyrrolidone (NMP) And then dried in an oven at 120 ° C for 2 hours. The prepared LNMO, carbon black (super P) and polyvinylidene fluoride (PVdF) were mixed at a weight ratio of 80:10:10, and then the mixture was cast in an Al foil by a casting process, followed by drying in an oven at 120 ° C for 2 hours . An anode and a cathode having the same structure were manufactured by punching an Al foil coated with an anode and an Al foil coated with a cathode, and an electrode tab was formed by ultrasonic welding on the Al electrode, (1.15 M LiPF 6 in EC / DMC / DEC = 3/5/2 (v / v) +3.0 wt% FEC + 2.0 wt% PS) were poured into the pouches and vacuum- A battery was prepared.

FIG. 3 is a photograph showing the inside of a coplanar secondary battery in which the positive electrode and the negative electrode are the same collector according to the present invention, and FIG. 4 is a photograph showing a coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention.

Example 2: Manufacture of coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector 2

The prepared LTO powder was milled and mixed with pyromellitic acid hydrate, which is an organic additive, in a weight ratio of 9.5: 0.5, followed by high-energy ball milling for 2 hours and then heat-treated at 600 ° C for 2 hours to prepare carbon coated LTO powder A secondary battery was manufactured in the same manner as in Example 1 above.

Experimental Example 2: Capacity Analysis According to the Type of Coplanar Regenerative Cell in which Positive and Negative Electrodes are Same Current Collector

In order to examine the capacity of the coplanar type secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention, a pouch cell type secondary battery was manufactured and its capacity was analyzed. The results are shown in FIG. 5 .

5 is a graph showing changes in voltage and capacitance due to a constant current discharge (0.1C) of a pouch-cell type coplanar type secondary battery in which the positive and negative electrodes are the same collector according to the present invention.

As shown in FIG. 5, a capacity of 0.068 mAh / cm.sup.2 was exhibited in the pouch type cell type coplanar type secondary battery.

Therefore, the coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector according to the present invention can form a positive electrode and a negative electrode in the same aluminum current collector to simplify electrode assembly and process, The negative electrode and the positive electrode are present on the same plane, so that a flexible secondary battery can be manufactured.

Although the embodiments of the present invention have been described with respect to a coplanar secondary battery in which the positive and negative electrodes are the same current collector according to the present invention and a manufacturing method thereof, various modifications may be made without departing from the scope of the present invention. Do.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

100: Coplanar secondary battery in which the positive electrode and the negative electrode are the same current collector
110: Aluminum housing
120: cathode
121: negative electrode material
130: anode
131: anode material

Claims (9)

A cathode having a plurality of rod-shaped parallel protrusions formed on one side of the aluminum current collector and coated with a carbon-coated negative electrode material; And
And a cathode on which a plurality of rod-shaped parallel projections are formed on one side of another aluminum collector and which is coated with a cathode material,
A plurality of parallel protrusions formed on the negative electrode and the positive electrode are alternately provided,
Further comprising an aluminum current collector extending from the uppermost end of the bar-shaped parallel protrusion,
Wherein the cathode, the anode, and the aluminum current collector are located on the same plane,
The width ratio of the parallel protrusions of the negative electrode or the positive electrode to the parallel protrusions of the negative electrode and the positive electrode is 2: 1,
Li ₄ Ti ₅ O ₁₂ was prepared by a solid-phase synthesis method by mixing lithium carbonate and titanium oxide with lithium carbonate and high-energy ball milling, mixing the Li ₄ Ti ₅ O ₁₂ and the organic additive, followed by high energy ball milling, ≪ / RTI >
The cathode material is manufactured by a solid phase synthesis method by mixing a cathode precursor and high energy ball milling,
Wherein the positive electrode and the negative electrode are of the same current collector type, wherein the separator and the electrolyte are poured into a vacuum pouch cell type.
delete delete The method according to claim 1,
The cathode material may be selected from the group consisting of LiNi _0.5 Mn _1.5 O ₄ , LiMn ₂ O ₄ , LiCoO ₂ , LiFePo ₄ , LiCoPO ₄ , LiMnPo ₄ , LiV ₃ O ₈ , V ₂ O ₅ , VO ₂ , Ti ₂ P ₂ O ₇ , LiNiO ₂ , Wherein the positive electrode and the negative electrode are one selected from the group consisting of LiNi _0.5 Mn _0.5 O ₂ , LiNi _0.8 Co _0.15 Al _0.05 O ₂ , LiNi _0.33 Co _0.33 Mn _0.33 O ₂ and LiNi _0.5 Co _0.2 Mn _0.3 O ₂ A coplanar flexible secondary battery as a whole.
delete Lithium carbonate and titanium oxide were mixed and high-energy ball milled to prepare Li ₄ Ti ₅ O ₁₂ by solid-phase synthesis, Li ₄ Ti ₅ O ₁₂ and the organic additive were mixed and then subjected to high-energy ball milling, Preparing a negative electrode by coating the heat-treated negative electrode material on an aluminum foil;
Mixing the cathode precursor and high-energy ball milling to prepare a cathode material by a solid-phase synthesis method, and applying the cathode material to an aluminum foil to prepare a cathode; And
And a plurality of protrusions formed on the anode and the cathode are alternately formed after the cathode and the anode are formed by punching a plurality of rod-like protrusions, wherein the width of the protrusions of the cathode or the anode is 2 : ≪ RTI ID = 0.0 > 1, < / RTI &
Wherein the pouch is packed with a separator and an electrolyte and vacuum-packed, the positive and negative electrodes being the same current collector.
delete The method according to claim 6,
Wherein the positive electrode precursor includes at least two selected from the group consisting of Li ₂ NiO ₂ , MnO _2, Li ₂ CO ₃ , NiO, and MnCO _{3. The} positive electrode and the negative electrode are coplanar flexible secondary batteries ≪ / RTI >
delete

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