CN102299297A - Cathode of lithium ion battery and preparation method thereof - Google Patents
Cathode of lithium ion battery and preparation method thereof Download PDFInfo
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- CN102299297A CN102299297A CN2011102200761A CN201110220076A CN102299297A CN 102299297 A CN102299297 A CN 102299297A CN 2011102200761 A CN2011102200761 A CN 2011102200761A CN 201110220076 A CN201110220076 A CN 201110220076A CN 102299297 A CN102299297 A CN 102299297A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a cathode of a lithium ion battery. The material of the cathode, which comprises, by mass, 85-95% of lithium titanate, 3-10% of an adhesive, and 3-10% of a conductive agent, is coated on a current collector copper foil. The cathode which has the advantage of convenient operation allows the electrode yield to be improved, the battery manufacturing cost to be reduced, and battery performances to be excellent.
Description
Technical field
The invention belongs to the lithium-ion-power cell field, relate to a kind of lithium ion battery negative and manufacture method thereof.
Background technology
Lithium-ion-power cell is the novel battery of developing recently and developing rapidly, because peculiar advantages such as its high-energy-density, environmental protection are widely used in a plurality of fields such as electric automobile, energy-storage system, military use product.
Lithium titanate is the ion secondary battery cathode material lithium of a kind of high-performance, high magnification type, has excellent cycle performance and good charge and discharge platform.Embed or deviate from the process at lithium ion, crystal formation does not change, and is considered to " zero strain material ".Have more excellent cycle life and security performance than traditional carbon negative pole material, therefore be considered to a kind of material of the most potential alternative carbon negative pole.
The general lithium titanate that uses is as the negative pole main raw material(s), and for the consideration of cost, the more options aluminium foil is as its coated substrates.Aluminium foil is as matrix, light weight, and cost is low.But the aluminium foil pliability is relatively poor, is prone to phenomenons such as crackle, broken belt during coating, operating difficulties.And extend during roll-in greatlyyer, be prone to bad phenomenon such as fold.The conductivity of aluminium foil is lower than Copper Foil, and the internal resistance of cell that uses aluminium foil to make is bigger.
Summary of the invention
The object of the present invention is to provide negative pole of a kind of lithium ion battery and preparation method thereof.
The solution that the present invention solves its technical problem is:
A kind of lithium ion battery negative, its negative material is made up of lithium titanate 85 ~ 95%, adhesive 3 ~ 10%, conductive agent 3 ~ 10%, and negative material is coated on the copper foil of affluxion body, and wherein, percentage is mass percent.
Preferably, copper thickness is 9 ~ 20 μ m.
Preferably, adhesive is an aqueous binder, any in the oil binder.
Preferably, aqueous binder is at least a among W811, W812, the LA132.
Preferably, oil binder is PVDF.
Preferably, conductive agent is at least a in SP, superconduction carbon black, electrically conductive graphite, the carbon nano-tube.
Above-mentioned lithium ion battery negative preparation method comprises the steps:
1) above-mentioned negative material is dissolved in solvent, is mixed with cathode size through after the high-speed stirred;
2) cathode size is coated on the copper foil of affluxion body equably, and Copper Foil is through vacuum bakeout 3～10h, and roll-in cuts into negative plate;
3) negative plate enters lamination through vacuum bakeout 12～30h with positive plate, encapsulation, and baking, fluid injection, forming and capacity dividing are promptly finished the preparation of the negative pole of lithium ion battery.
Preferably, the pressure of vacuum be-0.06～-0.10MPa.
Preferably, baking temperature is 60～120 ℃.
The invention has the beneficial effects as follows: lithium ion battery negative of the present invention uses lithium titanate as main negative material, has excellent cycle performance and good charge and discharge platform; Use ductility Copper Foil is preferably made collector, bad phenomenon such as broken belt, crackle can not occur in crossing of coating planted, and is easy to operate, improved the electrode rate of finished products, reduced the battery manufacturing cost; Because copper conductivity is better, the internal resistance of cell that uses Copper Foil to make as matrix is lower.
Description of drawings
Fig. 1 is the charging and discharging curve of embodiment 1 lithium ion battery;
Fig. 2 is the 1c cyclic curve of embodiment 1 lithium ion battery.
Embodiment
The present invention is further illustrated below in conjunction with embodiment, but be not limited thereto.
Following positive plate all is dissolved in pure water by the raw material that 93% LiFePO 4,4% LA132,4% SP form, and stirs, and coats aluminium foil, baking, roll-in, cuts and forms; Barrier film is: the individual layer PP barrier film of PP material; Electrolyte is: 1.2mol/L LiPF
6Solution, solvent composition are EC:DMC:EMC=1:1:1; Shell is the plastic casing of white PP material.
W811, W812 are all available from Shenzhen prestige Jack Technology Co; SP converges general industrial chemical Co., Ltd available from Shanghai.
Negative material comprises: 91% lithium titanate, 3% LA132,6% SP;
The preparation process of lithium ion battery negative is as follows:
1) with lithium titanate, LA132, SP, be dissolved in pure water, as cathode size, slurry is even through duplicate rows star power mixer high-speed stirred, enters painting process behind elimination bubble, the iron filings;
2) collector is selected 12 μ m Copper Foils, and slurry is coated in cathode size on the collector equably through automatical feeding system, coating machine, and coating finishes the utmost point and twists in vacuum pressure-0.08MPa, and 110 ℃ of environment are down behind baking 6 h, roll-in, cuts into negative plate;
3) negative plate is at vacuum pressure-0.09MPa, enter the lamination operation behind the 24h under 80 ℃ of curing environments, in the assembly shop positive plate, barrier film, negative plate are laminated into electric core together, electric core is put into plastic casing lentamente, fluid injection behind baking 48h under-0.09 MPa, the 80 ℃ of environment, forming and capacity dividing become the 120Ah lithium ion battery, have finished the preparation of lithium ion battery negative simultaneously.
Charging and discharging curve such as Fig. 1 of embodiment 1 lithium battery, the lithium ion battery list ceiling voltage 2.25V that only charges as seen from the figure, the discharge minimum voltage is 1.0V.
1c cyclic curve such as Fig. 2 of embodiment 1 lithium battery, discharge capacity is stabilized in about 125Ah as seen from the figure, demonstrates the favorable charge-discharge performance.
Negative material comprises: 88% lithium titanate, 9% W811,3% superconduction carbon black;
The preparation process of lithium ion battery negative is as follows:
1) with lithium titanate, W811, superconduction carbon black, be dissolved in pure water, as cathode size, slurry is even through duplicate rows star power mixer high-speed stirred, enters painting process behind elimination bubble, the iron filings;
2) collector is selected 9 μ m Copper Foils, and slurry is coated in cathode size on the collector equably through automatical feeding system, coating machine, and coating finishes the utmost point and twists in vacuum pressure-0.08MPa, and 120 ℃ of environment are down behind baking 3 h, roll-in, cuts into negative plate;
3) negative plate is at vacuum pressure-0.09MPa, enter the lamination operation after 18 under 100 ℃ of curing environments, in the assembly shop positive plate, barrier film, negative plate are laminated into electric core together, electric core is put into plastic casing lentamente, fluid injection behind baking 48h under-0.07 MPa, the 90 ℃ of environment, forming and capacity dividing become the 120Ah lithium ion battery, have finished the preparation of lithium ion battery negative simultaneously.
Embodiment 3
Negative material comprises: 85% lithium titanate, 5% W812,10% electrically conductive graphite;
The preparation process of lithium ion battery negative is as follows:
1) with lithium titanate, W812, electrically conductive graphite, be dissolved in pure water, as cathode size, slurry is even through duplicate rows star power mixer high-speed stirred, enters painting process behind elimination bubble, the iron filings;
2) collector is selected 15 μ m Copper Foils, and slurry is coated in cathode size on the collector equably through automatical feeding system, coating machine, and coating finishes the utmost point and twists in vacuum pressure-0.06MPa, and 100 ℃ of environment are down behind baking 10 h, roll-in, cuts into negative plate;
3) negative plate is at vacuum pressure-0.08MPa, enter the lamination operation behind the 30h under 60 ℃ of curing environments, in the assembly shop positive plate, barrier film, negative plate are laminated into electric core together, electric core is put into plastic casing lentamente, fluid injection behind baking 48h under-0.09 MPa, the 90 ℃ of environment, forming and capacity dividing become the 120Ah lithium ion battery, have finished the preparation of lithium ion battery negative simultaneously.
Embodiment 4
Negative material comprises: 95% lithium titanate, 5% W811,5% W812,2% SP, 3% carbon nano-tube;
The preparation process of lithium ion battery negative is as follows:
1) with lithium titanate, W811, W812, SP, carbon nano-tube, be dissolved in pure water, as cathode size, slurry is even through duplicate rows star power mixer high-speed stirred, enters painting process behind elimination bubble, the iron filings;
2) collector is selected 20 μ m Copper Foils, and slurry is coated in cathode size on the collector equably through automatical feeding system, coating machine, and coating finishes the utmost point and twists in vacuum pressure-0.07MPa, and 120 ℃ of environment are down behind baking 8 h, roll-in, cuts into negative plate;
3) negative plate is at vacuum pressure-0.10MPa, enter the lamination operation behind the 25h under 90 ℃ of curing environments, in the assembly shop positive plate, barrier film, negative plate are laminated into electric core together, electric core is put into plastic casing lentamente, fluid injection behind baking 48h under-0.09 MPa, the 80 ℃ of environment, forming and capacity dividing become the 120Ah lithium ion battery, have finished the preparation of lithium ion battery negative simultaneously.
Claims (9)
1. lithium ion battery negative, its negative material is made up of lithium titanate 85 ~ 95%, adhesive 3 ~ 10%, conductive agent 3 ~ 10%, and negative material is coated on the copper foil of affluxion body, and wherein, percentage is mass percent.
2. a kind of lithium ion battery negative according to claim 1 is characterized in that: copper thickness is 9 ~ 20 μ m.
3. a kind of lithium ion battery negative according to claim 1 is characterized in that: adhesive is an aqueous binder, any in the oil binder.
4. a kind of lithium ion battery negative according to claim 3 is characterized in that: aqueous binder is at least a among W811, W812, the LA132.
5. a kind of lithium ion battery negative according to claim 3 is characterized in that: oil binder is PVDF.
6. a kind of lithium ion battery negative according to claim 1 is characterized in that: conductive agent is at least a in SP, superconduction carbon black, electrically conductive graphite, the carbon nano-tube.
7. the described lithium ion battery negative preparation method of claim 1 comprises the steps:
1) the described negative material of claim 1 is dissolved in solvent, is mixed with cathode size through after the high-speed stirred;
2) cathode size is coated on the copper foil of affluxion body equably, and Copper Foil is through vacuum bakeout 3～10h, and roll-in cuts into negative plate;
3) negative plate enters lamination through vacuum bakeout 12～30h with positive plate, encapsulation, and baking, fluid injection, forming and capacity dividing are promptly finished the preparation of the negative pole of lithium ion battery.
8. the preparation technology of lithium ion battery according to claim 7 is characterized in that: the pressure of described vacuum is-0.06～-0.10MPa.
9. the preparation technology of lithium ion battery according to claim 7, it is characterized in that: described baking temperature is 60～120 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529445A (en) * | 2015-12-25 | 2016-04-27 | 苏州格瑞动力电源科技有限公司 | Negative electrode of lithium ion battery |
| CN110021736A (en) * | 2019-04-26 | 2019-07-16 | 湖北金泉新材料有限责任公司 | A kind of corrugated method of collector in reduction electrode plates preparation process |
| WO2020134765A1 (en) * | 2018-12-24 | 2020-07-02 | 珠海冠宇电池有限公司 | Negative electrode plate for reducing impedance of lithium ion battery and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105529445A (en) * | 2015-12-25 | 2016-04-27 | 苏州格瑞动力电源科技有限公司 | Negative electrode of lithium ion battery |
| WO2020134765A1 (en) * | 2018-12-24 | 2020-07-02 | 珠海冠宇电池有限公司 | Negative electrode plate for reducing impedance of lithium ion battery and preparation method therefor |
| CN110021736A (en) * | 2019-04-26 | 2019-07-16 | 湖北金泉新材料有限责任公司 | A kind of corrugated method of collector in reduction electrode plates preparation process |
| CN110021736B (en) * | 2019-04-26 | 2021-09-24 | 湖北亿纬动力有限公司 | Method for reducing wrinkling of current collector in electrode plate preparation process |
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Owner name: ZHUHAI LITHIUM NEW ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHUHAI LIYUAN POWER TECHNOLOGY CO., LTD. Effective date: 20120112 |
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Effective date of registration: 20120112 Address after: 519000 Guangdong Province, Zhuhai city Xiangzhou District Jida Waterfront Road No. 47 room 1206 Applicant after: Zhuhai Liyuan New Energy Technology Co., Ltd. Address before: 519015 Guangdong province Zhuhai Jida Waterfront Road No. 47 Everbright 1205 Applicant before: Zhuhai Liyuan Power Technology Co., Ltd. |
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Application publication date: 20111228 |