CN104412438A - Secondary cell - Google Patents
Secondary cell Download PDFInfo
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- CN104412438A CN104412438A CN201380034508.7A CN201380034508A CN104412438A CN 104412438 A CN104412438 A CN 104412438A CN 201380034508 A CN201380034508 A CN 201380034508A CN 104412438 A CN104412438 A CN 104412438A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
A secondary cell in which are stacked pluralities of: positive electrodes (10a, 10b) equipped with an electrolytic solution and an electrode member (2) immersed for use in the electrolytic solution, the electrode member (2) having positive electrode active material layers (12, 13) formed on the surface of a positive electrode current collector foil (11); negative electrodes (20) having negative electrode active material layers (22, 23) formed on the surface of a negative electrode current collector foil (21); and separators (30) disposed between the positive electrodes (10a, 10b) and the negative electrodes (20). Each of the positive electrode active material layers (12, 13) and the negative electrode active material layers (22, 23) that face each other across a separator (30) constitute an electrode pair (41, 42). The electrode pairs (41, 42) comprise first electrode pairs (41) made from a first active material layer provided with a first property, which is relatively high-output and low-capacity, and second electrode pairs (42) made from a second active material layer provided with a second property, which is relatively low-output and high-capacity.
Description
Technical field
The present invention relates to secondary cell.
Background technology
In the past, as the battery that the motor be mounted in the motor vehicle such as electric automobile, plug-in hybrid-power automobile drives, use the secondary cells such as lithium rechargeable battery.Be mounted in secondary cell in motor vehicle except require to for making vehicle climb, accelerate and excellence that High-current output that low temperature drives is corresponding output characteristic and with charge rapidly, regenerate time big current input except the input characteristics of corresponding excellence, the also requirement high energy capacity characteristic that can drive for a long time.
In order to improve input-output characteristic, the energy capacity characteristic of such secondary cell, propose there is following secondary cell: carried out adjusting to make the secondary cell that the impedance ratio of positive plate and negative plate becomes preset range, the secondary cell (for example, referring to patent documentation 1,2) adjusted based on the coating weight of curvature to electrode material of the electrode spirally reeled to electrode material.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2011-187186 publication
Patent documentation 2: Japanese Unexamined Patent Publication 9-180704 publication
Summary of the invention
The technical problem of the present invention for solving
But, because the input-output characteristic of secondary cell is in contrary relation with energy capacity characteristic, therefore, there is following problem: even secondary cell as described above, following battery can not be realized: have concurrently can be instantaneous by the input-output characteristic of the excellence of big current input and output, the high energy capacity characteristic that can drive for a long time simultaneously.
Therefore, in view of such situation, object is that provide a kind of has excellent input-output characteristic and the secondary cell of high energy capacity characteristic concurrently simultaneously in the present invention.
For the technical scheme of dealing with problems
The technical scheme of the present invention solved the problem is the secondary cell having electrolyte and be submerged in the electrod assembly used in this electrolyte, it is characterized in that, described electrod assembly is laminated with: the positive pole with the positive electrode active material layer on the surface being formed in positive pole collector foil; There is the negative pole of the negative electrode active material layer on the surface being formed in negative pole collector foil; And the isolated part be configured between described positive pole and described negative pole, form electrode pair by across the opposed described positive electrode active material layer of described isolated part and described negative electrode active material layer, described electrode pair comprises: by having high output comparatively speaking and the 1st electrode pair that forms of the 1st active material layer of the 1st characteristic of low capacity; And by there is low output comparatively speaking and the 2nd electrode pair that forms of the 2nd active material layer of the 2nd characteristic of high power capacity.
According to the invention described above, there is high output comparatively speaking and the 1st electrode pair of the 1st characteristic of low capacity and there is low output comparatively speaking and the 2nd electrode pair of the 2nd characteristic of high power capacity owing to possessing in 1 electrod assembly, therefore, by this electrod assembly is used as electrode, thus can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
At this, preferably, described 1st active material layer of described 1st electrode pair and described 2nd active material layer of described 2nd electrode pair, by making at least any one difference of the kind of the thickness of layer, coating weight and cambial active material, and corresponding with described 1st characteristic and described 2nd characteristic.
Thus, due to the difference of the kind of the difference of the thickness of active material layer, the difference of coating weight or active material, thus described 1st characteristic and described 2nd characteristic can be found.Therefore, there is high output comparatively speaking and the 1st electrode pair of the 1st characteristic of low capacity and there is low output comparatively speaking and the 2nd electrode pair of the 2nd characteristic of high power capacity owing to possessing in 1 electrod assembly, therefore, by this electrod assembly is used as electrode, thus can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
At this, preferably, described positive pole and described negative pole have active material layer respectively on two of collector foil faces, the at least one party of described positive pole and negative pole has described 1st active material layer corresponding with described 1st characteristic on a face of described collector foil, and has described 2nd active material layer corresponding with described 2nd characteristic on the other surface.
Thus, two faces due to the collector foil of at least one party at positive pole and negative pole are formed with respectively input-output characteristic and the different active material layer of capacity characteristic, therefore, in 1 electrod assembly, input-output characteristic and the different active material layer of capacity characteristic are respectively equipped with multiple.Therefore, it is possible to realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
At this, preferably, the collector foil of described positive pole and described negative pole is formed with multiple hole.
Thus, by providing holes in collector foil, when the current potential of the active material layer charged and after electric discharge becomes different states, because lithium ion also can move in active material layer via the hole of collector foil, therefore, promote the mitigation of current potential.
In addition, preferably, described 1st electrode pair and described 2nd electrode pair are formed by multilayer laminated or winding.
Thus, due to by electrode pair is multilayer laminated or winding, the respective surface area of active material layer can be made to increase, therefore, it is possible to improve input-output characteristic and the energy capacity characteristic of secondary cell further.
Invention effect
According to secondary cell of the present invention, can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic concurrently simultaneously.
Accompanying drawing explanation
Fig. 1 is the stereogram of the secondary cell of execution mode 1.
Fig. 2 is the X-X ' line cross-sectional schematic of the secondary cell of Fig. 1.
Fig. 3 is the partial enlargement cross-sectional schematic of the electrode for secondary battery parts of execution mode 1.
Fig. 4 is the 1st characteristic of the secondary cell that execution mode 1 is shown and the output time of each electrode pair of the 2nd characteristic and the graph of a relation of current value.
Fig. 5 is the figure of the charged state of the secondary cell that execution mode 1 is shown.
Fig. 6 is the stereogram of the collector foil of execution mode 2.
Fig. 7 is the partial enlargement cross-sectional schematic of the electrode for secondary battery parts of execution mode 3.
Description of reference numerals
1 laminated-type lithium rechargeable battery
2 electrod assemblies
3 laminate housing bodies
4 positive terminals
5 negative terminals
6 electrolyte
10 positive poles
11 positive pole collector foil
12 the 1st positive electrode active material layers
13 the 2nd positive electrode active material layers
20 negative poles
21 negative pole collector foil
22 the 1st negative electrode active material layers
23 the 2nd negative electrode active material layers
30 isolated parts
41 the 1st electrode pairs
42 the 2nd electrode pairs
50 through holes
Embodiment
Below, the present invention is described in detail based on execution mode.
(execution mode 1)
The secondary cell of present embodiment is laminated-type lithium rechargeable battery, such as, be mounted on the bottom (under floor) of the motor vehicle as electric automobile, and the traveling motor etc. to motor vehicle supplies electric power.
Use Fig. 1 ~ Fig. 3 that the electrod assembly that the secondary cell of embodiments of the present invention 1 and this secondary use is described.Fig. 1 is the stereogram of the laminated-type lithium rechargeable battery of present embodiment, and Fig. 2 is the X-X ' line cross-sectional schematic of Fig. 1, and Fig. 3 is the partial enlargement cross-sectional schematic of the electrod assembly of the secondary cell shown in Fig. 2.
As shown in Figures 1 and 2, laminated-type lithium rechargeable battery 1 comprises: the laminate housing body 3 of rectangular flat shape, and it is accommodated with electrod assembly 2; And positive terminal 4 and negative terminal 5, it is arranged highlightedly from the short brink of the long side direction both sides of this laminate housing body 3, takes out electric power from electrod assembly 2.Electrod assembly 2 is that multiple positive pole 10 is stacked across isolated part 30 with multiple negative pole 20, and multiple positive pole 10 is electrically connected with positive terminal 4, and multiple negative pole 20 is electrically connected with negative terminal 5.In addition, electrod assembly 2 is submerged in electrolyte 6 in laminate housing body 3.
As shown in Figure 3, the positive pole 10 of electrod assembly 2 forms positive electrode active material layer respectively on two faces of positive pole collector foil 11, has: the positive pole 10a being formed with the 1st thin comparatively speaking positive electrode active material layer 12 on both faces; And be formed with the positive pole 10b of the 2nd thick comparatively speaking positive electrode active material layer 13 on both faces.Another face, negative pole 20 is formed with the 1st thin comparatively speaking negative electrode active material layer 22 on a face of negative pole collector foil 21, is formed with the 2nd thick comparatively speaking negative electrode active material layer 23 on the other surface.These positive poles 10a, 10b and negative pole 20 between to clip isolated part 30 alternately stacked, 1st positive electrode active material layer 12 of positive pole 10a is opposed across isolated part 30 with the 1st negative electrode active material layer 22 of negative pole 20, in addition, the 2nd positive electrode active material layer 13 of positive pole 10b and the 2nd negative electrode active material layer 23 of negative pole 20 opposed across isolated part 30.And, the part opposed across isolated part 30, the 1st positive electrode active material layer 12 and the 1st negative electrode active material layer 22 becomes the 1st electrode pair 41, the part opposed across isolated part 30, the 2nd positive electrode active material layer 13 and the 2nd negative electrode active material layer 23 becomes the 2nd electrode pair 42, in the present embodiment, be the formation that 2 the 1st electrode pairs, 41 and 2 the 2nd electrode pairs 42 are alternately laminated.
At this, there is high output comparatively speaking and the 1st characteristic of low capacity across the 1st electrode pair 41 that isolated part 30, the 1st positive electrode active material layer 12 and the 1st negative electrode active material layer 22 are opposed, close the 2nd opposed electrode pair 42 of the 2nd negative electrode active material layer 23 there is low output comparatively speaking and the 2nd characteristic of high power capacity across isolated part 30, the 2nd positive electrode active material layer 13.
In the present embodiment, by making the electrod assembly 2 of the 2nd electrode pair 42 that there is the different active material layer of thickness comparatively speaking, the 1st electrode pair 41 be namely made up of the 1st thin comparatively speaking positive electrode active material layer 12 and the 1st negative electrode active material layer 22 and be made up of the 2nd thick comparatively speaking positive electrode active material layer 13 and the 2nd negative electrode active material layer 23, thus make the secondary cell with 2 contrary battery behaviors.
At this, high output and the meaning of the 1st characteristic of low capacity refer to comparatively speaking, in the case, input-output characteristic is high and energy capacity characteristic is low compared with the 2nd characteristic, low output and the meaning of the 2nd characteristic of high power capacity refer to comparatively speaking, and input-output characteristic is low and energy capacity characteristic is high compared with the 1st characteristic.
With reference to Fig. 4, the 1st such characteristic and the 2nd characteristic are described.Fig. 4 is the figure of the relation of the time of the output representing secondary cell and the current value of output.
As shown in Figure 4, in the part of the 1st electrode pair 41, due to the 1st positive electrode active material layer 12 and the 1st negative electrode active material layer 22 thin, correspondingly the internal driving of active material layer is little, therefore, it is possible to carry out the input and output of big current, but, because the active matter quality of entirety is few, therefore, (capacity) is little the duration.On the other hand, there is the part of the 2nd electrode pair 42 of the 2nd thick positive electrode active material layer 13 and the 2nd negative electrode active material layer 23 due to active material thickness, therefore, compared with the 1st electrode pair 41, internal driving is large, the big current of that degree of the 1st electrode pair 41 that can not flow, but due to active material thickness, correspondingly energy capacity is high, therefore, it is possible to obtain larger capacity.In the present embodiment, using the former as the 1st characteristic, using the latter as the 2nd characteristic.
At this, further illustrate the 1st electrode pair 41 be made up of the 1st thin comparatively speaking positive electrode active material layer 12 and the 1st thin comparatively speaking negative electrode active material layer 22.Because the charging of lithium rechargeable battery, electric discharge are moved (diffusion) by lithium ion and carried out between positive pole and negative pole, therefore, what the distance of lithium ion movement thickness that is short, i.e. active material layer was thin one enough can reduce internal driving, input-output characteristic improves, but, on the other hand, capacity reduces.Namely, the input and output response that the 1st electrode pair 41 be made up of the 1st positive electrode active material layer 12 and the 1st negative electrode active material layer 22 has for big current is fast, the input-output characteristic of the excellence that current potential promptly changes, but, capacity is low, has high output and the 1st characteristic of low capacity.
On the other hand, the 2nd electrode pair 42 be made up of the 2nd thick comparatively speaking positive electrode active material layer 13 and the 2nd negative electrode active material layer 23 is described.In order to make the energy capacity of lithium rechargeable battery improve, need the energy density improving active material layer, therefore, such as, the thickness of active material layer can be thickeied, but on the contrary, displacement due to lithium ion becomes large, therefore, then becomes unfavorable for input-output characteristic.Therefore, the 2nd electrode pair 42 be made up of the 2nd positive electrode active material layer 13 and the 2nd negative electrode active material layer 23 has the high energy capacity characteristic that can drive for a long time, but input-output characteristic is low, has low output and the 2nd characteristic of high power capacity.
In order to make, there is the 1st such characteristic and the secondary cell of the 2nd these both sides of characteristic, such as, make and there is the 1st different negative electrode active material layer 22 of thickness and the 2nd negative electrode active material layer 23, in the present embodiment, two faces of negative pole collector foil 21 arrange the 1st thin comparatively speaking negative electrode active material layer 22 and the 2nd thick comparatively speaking negative electrode active material layer 23, makes to have the 1st characteristic and the 2nd both characteristics concurrently.In the present embodiment, when the thickness of the 1st negative electrode active material layer 22 is 1 ~ 10 μm, the thickness of the 2nd negative electrode active material layer 23 is preferably 10 ~ 100 μm, when the thickness of the 1st negative electrode active material layer 22 is 10 ~ 50 μm, the thickness of the 2nd negative electrode active material layer 23 is preferably 50 ~ 200 μm.
In addition, in the 1st thin comparatively speaking negative electrode active material layer 22 and the 2nd thick comparatively speaking negative electrode active material layer 23, need the positive electrode active material layer with lithium amount of movement corresponding respectively, and corresponding with the 1st positive electrode active material layer 12 and the 2nd positive electrode active material layer 13 respectively, form the 1st electrode pair 41 and the 2nd electrode pair 42.Namely, between the 1st positive electrode active material layer 12 and the 1st negative electrode active material layer 22 or between the 2nd positive electrode active material layer 13 and the 2nd negative electrode active material layer 23, when making charging and electric discharge time lithium ion from the active material layer of a side to the mobile equity of the active material layer of the opposing party, potential change is stablized, make the control of secondary cell easy, improve the reliability of secondary cell.
In addition, in the present embodiment, as positive pole 10, there is the positive pole 10a of the 1st thin comparatively speaking positive electrode active material layer 12 by two faces being used in positive pole collector foil 11 and there is the positive pole 10b of the 2nd thick comparatively speaking positive electrode active material layer 13 on two faces of positive pole collector foil 11, thus corresponding with the 1st negative electrode active material layer 22 and the 2nd negative electrode active material layer 23.This is in view of with form the positive pole of different thickness at surface back side compared with, easily forms the positive pole of same thickness at surface back side, and employs positive pole 10a, 10b of 2 different kinds of thickness.Certainly, a face that also can be used in positive pole collector foil 11 is provided with the 1st thin positive electrode active material layer 12, is provided with the positive pole of the 2nd thick positive electrode active material layer 13 on the other surface.
As described above, the electrod assembly 2 of present embodiment by the active material layer of the different thickness of formation 1 electrod assembly 2 in, thus is formed respectively and multiplely has high output comparatively speaking and the 1st electrode pair 41 of the 1st characteristic of low capacity and have low output comparatively speaking and the 2nd electrode pair 42 of the 2nd characteristic of high power capacity.By this electrod assembly 2 is used as electrode, thus can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
At this, as the positive active material of formation the 1st positive electrode active material layer 12 and the 2nd positive electrode active material layer 13, include, for example the metal oxide etc. of the metal oxide of bedded structure type, the metal oxide of spinel-type and metallic compound, phosphate type.As the metal oxide of bedded structure type, lithium-nickel-based compound oxide, lithium-cobalt system composite oxides, ternary system composite oxides (LiCo can be enumerated
1/ 3Ni
1/ 3Mn
1/ 3O
2).As lithium-nickel-based compound oxide, preferably enumerate lithium nickelate (LiNiO
2).As lithium-cobalt system composite oxides, preferably enumerate cobalt acid lithium (LiCoO
2).As the metal oxide of spinel-type, LiMn2O4 (LiMn can be enumerated
2o
4) etc. lithium manganese system complex oxide.As the metal oxide of phosphate type, LiFePO4 (LiFePO can be enumerated
4), lithium manganese phosphate (LiMnPO
4) etc.In the present embodiment, as the active material of positive pole, LiCo is employed
1/ 3Ni
1/ 3Mn
1/ 3O
2but, the positive active material that the present invention can apply is not limited to this, in addition, is not limited to illustrated positive active material, as long as produce the material of the cell reaction in positive pole, then also can use other materials.
In addition, as the negative electrode active material of formation the 1st negative electrode active material layer 22 and the 2nd negative electrode active material layer 23, normally used active material can be enumerated, the amorphous carbon materials such as such as graphite, soft carbon or hard carbon.In addition, graphite can be Delanium also can be native graphite.In addition, lithium metal, metal oxide, metal sulfide, metal nitride etc. can be enumerated.As metal oxide, include, for example tin-oxide, Si oxide etc.In the present embodiment, as the active material of negative pole, graphite is employed, but the negative electrode active material that the present invention can apply is not limited to this, in addition, be not limited to illustrated negative electrode active material, as long as produce the material of the cell reaction in negative pole, then also can use other materials.
In addition, when forming positive electrode active material layer and negative electrode active material layer, also can distinguish in positive active material or negative electrode active material further containing adhesive, such as, can use Kynoar.In addition, also can containing conductivity improving agents such as acetylene carbon blacks in negative or positive electrode active material layer.
In addition, electrolyte 6 can enumerate normally used solvent, include, for example as the ethylene carbonate of cyclic carbonate, propene carbonate or, be dissolved with lithium hexafluoro phosphate (LiPF in the mixed solution of dimethyl carbonate as linear carbonate, methyl ethyl carbonate, diethyl carbonate
6) be the organic electrolyte about every 1 liter of 1 molar concentration.
Then, shown in Fig. 5 (a) ~ (c), represent that the charged state of the secondary cell of present embodiment is (hereinafter referred to as " SOC ".) figure.In addition, the charged state of the 1st electrode pair 41 that the A in Fig. 5 is formed with by active material layer thin is comparatively speaking corresponding, and the charged state of the 2nd electrode pair 42 that the B in Fig. 5 is formed with by active material layer thick is comparatively speaking corresponding.
Fig. 5 (a) is the figure of voltage when charging beginning is shown.Charge start time, the 1st electrode pair 41 (A) this side with the 1st thin comparatively speaking negative electrode active material layer 22 due to internal driving little, therefore, voltage rises hastily, accompanies therewith, charges and also carries out hastily.On the other hand, the 2nd electrode pair 42 (B) with the 2nd thick comparatively speaking negative electrode active material layer 23 due to compared with the 1st electrode pair 41 internal driving large, therefore, charging is carried out lentamente.That is, charging passes through in the electrolytic solution from the lithium ion by departing from from positive electrode active material layer, and move to negative electrode active material layer via isolated part and carry out.Therefore, the displacement of lithium ion is short, the charging of the 1st this side of electrode pair 41 namely with the 1st negative electrode active material layer 22 is promptly carried out, and the 2nd this side of electrode pair 42 with the 2nd negative electrode active material layer 23 carries out lentamente.
Fig. 5 (b) illustrates at the figure of voltage when terminating and relax with the potential state of the 2nd electrode pair 42 with the 2nd thick comparatively speaking negative electrode active material layer 23 the 1st electrode pair 41 with the 1st thin comparatively speaking negative electrode active material layer 22 that charges.At the end of charging, the SOC of the 1st electrode pair 41 (A) is high, and the SOC of the 2nd electrode pair 42 (B) is low.Its reason is: according to the difference of above-mentioned charging rate, in the 1st thin comparatively speaking negative electrode active material layer 22, because capacity relative is low, therefore, charge volume is filled to maximum in permissible range, in the 2nd thick comparatively speaking negative electrode active material layer 23, because capacity relative is large, therefore, in same time charge volume lower than permissible range.In order to relax the difference (potential difference) of this charge volume, lithium ion moves to the 2nd thick comparatively speaking negative electrode active material layer 23 from the 1st thin comparatively speaking negative electrode active material layer 22 via electrolyte, moves to poised state.
Fig. 5 (c) be mitigation is shown at the end of the figure of voltage.Terminate if relax, then the 1st electrode pair 41 with the 1st thin comparatively speaking negative electrode active material layer 22 becomes identical with the voltage of the 2nd electrode pair 42 with the 2nd thick comparatively speaking negative electrode active material layer 23.
Like this, in the 1st electrode pair 41 with the 1st thin comparatively speaking negative electrode active material layer 22, because the response inputted for the big current charged, particularly charge such is rapidly fast, therefore, input characteristics is excellent, but thickness is thin, charge volume is filled immediately, and energy capacity characteristic is low.On the other hand, in the 2nd electrode pair 42 with the 2nd thick comparatively speaking negative electrode active material layer 23, the response for charging is slow, but thickness is thick, can guarantee high energy capacity.In addition, in Figure 5, describe for the 1st electrode pair 41 be made up of active material layer thin comparatively speaking and the input characteristics of the charging of the 2nd electrode pair 42 be made up of active material layer thick comparatively speaking and energy capacity characteristic, but, for electric discharge, be also same output characteristic and energy capacity characteristic certainly.
Therefore, by arranging the 1st electrode pair 41 and the 2nd electrode pair 42 that are made up of the active material layer of different thickness in 1 electrod assembly 2, thus the part of input-output characteristic excellence exists jointly with the part with high energy capacity characteristic.By this electrod assembly is used as electrode, thus can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
In addition, in the above-described embodiment, two faces of collector foil arrange active material layer to define negative or positive electrode, but, the positive pole being only provided with active material layer on the one side of collector foil and negative pole also can be used to form above-mentioned electrod assembly.
(execution mode 2)
Present embodiment is the variation of the electrod assembly of execution mode 1, as shown in Figure 6, except the positive pole being provided with the active material layer same with execution mode 1 except using the positive pole collector foil 11A comprehensively with multiple through hole 50 and negative pole collector foil 21A and negative pole, identical with execution mode 1.
Such positive pole collector foil 11A and negative pole collector foil 21A is used to be the mitigation of the potential state in order to promote above-mentioned Fig. 5 (b).That is, when the mitigation of potential state, such as, lithium ion also moves to the 2nd thick comparatively speaking negative electrode active material layer 23 via through hole 50 from the 1st thin comparatively speaking negative electrode active material layer 22, promotes dividing a word with a hyphen at the end of a line to poised state.
In addition, the forming position of through hole 50 is not limited to illustrated position, such as, also can change the formation density of through hole 50 according to place, such as, the central portion of the short side direction of each collector foil formation density of through hole 50 compared with the end of short side direction also can be made close.In addition, the shape for through hole 50 is not also defined as circle, such as, also can be substantially rectangular shape.
(execution mode 3)
Use Fig. 7 that embodiments of the present invention 3 are described.Execution mode 3 is variation of the formation of electrod assembly, and mark identical Reference numeral for the parts identical with execution mode 1, the repetitive description thereof will be omitted.
In execution mode 1, in order to arrange the 1st electrode pair 41 with the 1st characteristic and the 2nd electrode pair 42 with the 2nd characteristic, define the 1st thin comparatively speaking positive electrode active material layer 12 and the 1st negative electrode active material layer 22 and the 2nd thick comparatively speaking positive electrode active material layer 13 and the 2nd negative electrode active material layer 23, but, in the present embodiment, by making the kind of the positive active material of formation active material layer different, thus be provided with the 1st different comparatively speaking characteristics and the 2nd characteristic.
Fig. 7 is the partial enlargement cross-sectional schematic of the electrod assembly of present embodiment.As shown in Figure 7, electrod assembly 2A has positive pole 10a, and this positive pole 10a is formed with the 1st positive electrode active material layer 12A on a face of positive pole collector foil 11, and is formed with the 2nd positive electrode active material layer 13A on the other surface.At this, the details of the 1st positive electrode active material layer 12A and the 2nd positive electrode active material layer 13A in rear description, but, be use different active materials to be formed, and there is different characteristics.
Specifically, 1st positive electrode active material layer 12A is by having high output comparatively speaking and the Plant composition of the active material of the 1st characteristic of low capacity, and the 2nd positive electrode active material layer 13A is by having low output comparatively speaking and the Plant composition of the active material of the 2nd characteristic of high power capacity.Therefore, the thickness of the 1st positive electrode active material layer 12A and the 2nd positive electrode active material layer 13A is roughly equal, but, there is different characteristics respectively.Certainly, also can change thickness while the kind changing active material and make the 1st positive electrode active material layer 12A thin, and make the 2nd positive electrode active material layer 13A thick.
On the other hand, as the negative pole corresponding with positive pole 10a, in the position opposed with the 1st positive electrode active material layer 12A, be provided with the negative pole 20a being formed with the 1st thin comparatively speaking negative electrode active material layer 22 on two faces of negative pole collector foil 21, in the position opposed with the 2nd positive electrode active material layer 13A, be provided with the negative pole 20b being formed with the 2nd thick comparatively speaking negative electrode active material layer 23 on two faces of negative pole collector foil 21.Further, form the 1st electrode pair 41A with the 1st characteristic by the 1st positive electrode active material layer 12A and the 1st negative electrode active material layer 22, form the 2nd electrode pair 42A with the 2nd characteristic by the 2nd positive electrode active material layer 13A and the 2nd negative electrode active material layer 23.
In addition, in the same manner as execution mode 1, the meaning of the 1st characteristic refers to high output comparatively speaking and low capacity, and the meaning of the 2nd characteristic refers to low output comparatively speaking and high power capacity.
Like this, in execution mode 1, the difference of the characteristic of the 1st electrode pair 41 with the 1st characteristic and the 2nd electrode pair 42 with the 2nd characteristic is provided with by making the thickness of the active material layer of each electrode pair of formation different, but, in the present embodiment, not the thickness by active material layer, but by making the kind of positive active material different, and make the thickness of the negative electrode active material layer opposed with positive electrode active material layer correspond to the characteristic of positive active material, thus be provided with the difference of the 1st and the 2nd characteristic.
Such as, for there is high output and the 1st electrode pair 41A of the 1st characteristic of low capacity, the conductive high active material of applying electronic.Namely, in order to improve the input-output characteristic of lithium rechargeable battery, such as, as long as make the internal driving of active material layer reduce, if electronic conductivity is high, the conduction of electronics between the surface and active material of active material during charging and when discharging promptly is carried out, and can reduce the internal driving of active material layer.Further, such active layer can maintain high input-output characteristic.
On the other hand, for having low output and the 2nd electrode pair 42A of the 2nd characteristic of high power capacity, application has the active material of high energy capacity.Its reason is, in order to improve the energy capacity of lithium rechargeable battery, needs the energy density (capacity) improving active material self.
At this, illustrate that there is high output and the positive active material of the 1st characteristic of low capacity and have low output and the positive active material of the 2nd characteristic of high power capacity.
Whether have that high output characteristic can utilize the kind of various active material and particle footpath thereof, the conductive auxiliary agent amount that is added judges.
On the other hand, whether there is high capacity characteristics such as to judge based on the theoretical capacity of active material.LiCoO
2theoretical capacity be 274mAh/g, LiNiO
2theoretical capacity be 274mAh/g, LiMn
2o
4theoretical capacity be 148mAh/g, LiFePO
4theoretical capacity be 170mAh/g.Therefore, at this, LiCoO can be judged as
2and LiNiO
2with LiMn
2o
4and LiFePO
4compare and there is the characteristic of high power capacity comparatively speaking, can LiFePO be judged as
4with LiMn
2o
4compare and there is the characteristic of high power capacity comparatively speaking.
Like this, can by the kind of active material and particle footpath, the conductive auxiliary agent amount be added and theoretical capacity, the preferably value of actual capacity be carried out relatively, select to have high export and the active material of the 1st characteristic of low capacity with there is low output and the combination of the active material of the 2nd characteristic of high power capacity, in the present embodiment, as the positive active material of formation the 1st positive electrode active material layer 12A, employ the LiMn of high output low capacity comparatively speaking
2o
4, as the positive active material of formation the 2nd positive electrode active material layer 13A, employ low output comparatively speaking and the LiFePO of high power capacity
4.
Certainly, be particle size by changing active material due to the input-output characteristic of active material layer, the value of actual capacity or add electric conducting material or implement surface treatment or carry out crystal structure and overall upgrading (bulk-modified) etc. and the value of variation, therefore, also can by changing them to change input-output characteristic and the capacity characteristic of the 1st positive electrode active material layer 12A and the 2nd positive electrode active material layer 13A simultaneously.
In addition, utilize the upgrading of such active material, can be formed and there is extremely excellent height export and the active material of the 1st characteristic of low capacity and there is low output in contrast to this and the active material of the 2nd characteristic of extremely excellent high power capacity, if use the electrod assembly they combined, then can realize further having excellent input-output characteristic and the secondary cell of high energy capacity characteristic concurrently simultaneously.
In addition, as the negative electrode active material of formation the 1st and the 2nd negative electrode active material layer 22,23, as long as suitably select from the active material illustrated in execution mode 1 and change thickness to arrange, but, also can, the characteristic of studying active material same with above-mentioned positive active material, make the negative electrode active material corresponding to the 1st characteristic different from the negative electrode active material corresponding to the 2nd characteristic, also can change thickness while the kind changing active material.
As previously discussed, the electrod assembly 2A of present embodiment is due to also same with execution mode 1, there is high output comparatively speaking and the 1st electrode pair 41A of the 1st characteristic of low capacity and there is low output comparatively speaking and the 2nd electrode pair 42A of the 2nd characteristic of high power capacity owing to possessing, therefore, by this electrod assembly 2A is used as electrode, thus can realize having excellent input-output characteristic and the secondary cell of high energy capacity characteristic on the whole concurrently simultaneously.
(other execution modes)
In the above-described embodiment, exemplified with the electrode of the cascade type that positive pole and negative pole are laminated in a thickness direction, but, also can be the convoluted electrode of reel rectangular positive pole and negative pole.Such as, in the example of execution mode 1, if winding as shown in Figure 3, form 3 layers of positive pole and form the duplexer of the total of 4 layers 7 layers of negative pole, can as convoluted electrod assembly.
In addition, in the above-described embodiment, exemplified with electrode for lithium ion secondary battery parts, but, be not particularly limited in this, such as, also can be applied to the lighium polymer secondary battery that electrolyte be make use of to gelatinous polymer.In addition, the alkaline secondary cell such as nickel-cadmium cell, Ni-MH battery carried in the small-sized portable electronic devices such as mobile electric Words, subnotebook PC can be also applied to.
In addition, the container of the secondary cell of present embodiment, shape are laminated-type or pot, but, be not limited to this.Also can be such as Coin shape, cylinder type, coin shape, flap-type, square etc.In addition, these secondary cells both can be connected in series multiple, also can be connected in parallel.
Claims (5)
1. a secondary cell, it has electrolyte and is submerged in the electrod assembly used in this electrolyte, it is characterized in that,
Described electrod assembly is laminated with: the positive pole with the positive electrode active material layer on the surface being formed in positive pole collector foil; There is the negative pole of the negative electrode active material layer on the surface being formed in negative pole collector foil; And the isolated part be configured between described positive pole and described negative pole, form electrode pair by across the opposed described positive electrode active material layer of described isolated part and described negative electrode active material layer,
Described electrode pair comprises: by having high output comparatively speaking and the 1st electrode pair that forms of the 1st active material layer of the 1st characteristic of low capacity; And by there is low output comparatively speaking and the 2nd electrode pair that forms of the 2nd active material layer of the 2nd characteristic of high power capacity.
2. secondary cell as claimed in claim 1, is characterized in that,
Described 1st active material layer of described 1st electrode pair and described 2nd active material layer of described 2nd electrode pair, by making at least any one difference of the kind of the thickness of layer, coating weight and cambial active material, and corresponding with described 1st characteristic and described 2nd characteristic.
3. secondary cell as claimed in claim 1 or 2, is characterized in that,
Described positive pole and described negative pole have active material layer respectively on two of collector foil faces, the at least one party of described positive pole and negative pole has described 1st active material layer corresponding with described 1st characteristic on a face of described collector foil, and has described 2nd active material layer corresponding with described 2nd characteristic on the other surface.
4. secondary cell as claimed in claim 3, is characterized in that,
The collector foil of described positive pole and described negative pole is formed with multiple hole.
5. the secondary cell as described in any one of Claims 1 to 4, is characterized in that,
Described 1st electrode pair and described 2nd electrode pair are formed by multilayer laminated or winding.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012143323A JP5994977B2 (en) | 2012-06-26 | 2012-06-26 | Secondary battery |
| JP2012-143323 | 2012-06-26 | ||
| PCT/JP2013/056853 WO2014002532A1 (en) | 2012-06-26 | 2013-03-12 | Secondary cell |
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| CN104412438A true CN104412438A (en) | 2015-03-11 |
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Also Published As
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| JP5994977B2 (en) | 2016-09-21 |
| JP2014007107A (en) | 2014-01-16 |
| WO2014002532A1 (en) | 2014-01-03 |
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