CN104538668A - Lithium ion battery with relatively high safety and preparation method thereof - Google Patents

Lithium ion battery with relatively high safety and preparation method thereof Download PDF

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Publication number
CN104538668A
CN104538668A CN201410816290.7A CN201410816290A CN104538668A CN 104538668 A CN104538668 A CN 104538668A CN 201410816290 A CN201410816290 A CN 201410816290A CN 104538668 A CN104538668 A CN 104538668A
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CN
China
Prior art keywords
lithium ion
battery
ion battery
positive
cathode
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Pending
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CN201410816290.7A
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Chinese (zh)
Inventor
乐红春
王庆杰
魏俊华
陈铤
石斌
赵洪楷
万伟华
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Guizhou Meiling Power Supply Co Ltd
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Guizhou Meiling Power Supply Co Ltd
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Priority to CN201410816290.7A priority Critical patent/CN104538668A/en
Publication of CN104538668A publication Critical patent/CN104538668A/en
Pending legal-status Critical Current

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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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a lithium ion battery with relatively high safety. The lithium ion battery with relatively high safety is characterized in that anode slurry is prepared from the following components in percentage by weight: 85-95% of an anode material, 5-10% of an anode conducting agent and 3-8% of an anode binder; cathode slurry is prepared from the following components in percentage by weight: 88-95% of a cathode material, 6-10% of a cathode conducting agent and 4-8% of a cathode binder; a diaphragm is a polyimide diaphragm. The polyimide diaphragm has a relatively high temperature-resisting performance, can be used in a temperature range of (-269-280) DEG C for a long time and can reach a high temperature of 400 DEG C within a short time. By using polyimide as the diaphragm of the lithium ion battery, not only the battery has relatively good rate capability and cycle performance, but also the safety of the lithium ion battery can be improved.

Description

One has higher-security lithium ion battery and preparation method thereof
Technical field
The present invention relates to cell art, particularly a kind of lithium ion battery based on polyamide-imide barrier film.
Background technology
Chemical power source has had very important status at world's energy field, the wherein advantage such as lithium rechargeable battery voltage is high, volume is little, energy density is large owing to having, good cycle, self discharge efficiency are low, memory-less effect, be widely used in mobile phone, notebook computer, field camera, electric tool, non-portable medical apparatus (as electronic pacemaker), also applied to the aspect such as military affairs, space gradually simultaneously.
Lithium ion battery forms primarily of positive pole, negative pole, electrolyte and barrier film.Barrier film is as one of lithium ion battery important part, and its Main Function is separated by the positive and negative electrode of battery, prevents the two poles of the earth from directly contacting and being short-circuited; In addition, also should have and make the freely through function of ion.The polyethylene (PE) stretched through two-way precision that the current main product as lithium ion battery separator material is is representative with U.S. Celgard and Japanese UBE, polypropylene (PP) microporous membrane and polypropylene, polyethylene/polypropylene (PP/PE/PP) three layers of microporous compound film, porosity about 40%, thickness 25 ~ 40 μm.But, the fail safe of polyalkene diaphragm is poor, at battery temperature more than 70 DEG C, diaphragm micro-hole will be closed, and affects the normal work of battery, when battery temperature is more than 150 DEG C, barrier film can melt, cause positive/negative plate directly contact thus cause battery short circuit, on fire or blast may be caused, can serious safety concerns be caused.
Polyimide diaphragm (be called for short PI barrier film) by pyromellitic acid anhydride (PMDA) and diaminodiphenyl ether (DDE) in intensive polar solvent through polycondensation and casting film-forming form through imidization again.
Summary of the invention
The technical problem to be solved in the present invention is: the lithium ion battery providing a kind of high safety performance, overcomes the problem of existing lithium ion battery security difference.
Technical scheme of the present invention is: one has higher-security lithium ion battery, the weight percentage ranges of anode sizing agent: positive electrode: 85% ~ 95%, positive conductive agent: 5% ~ 10%, positive electrode binder: 3% ~ 8%; The weight percentage ranges of cathode size: negative material: 88% ~ 95%, cathode conductive agent: 6% ~ 10%, negative electrode binder: 4% ~ 8%; Barrier film is polyimide diaphragm.
Described membrane thicknesses is 20 ~ 40 .
Positive electrode is cobalt acid lithium, and positive conductive agent is one or more in carbon black, graphite, carbon nano-tube, acetylene black, and positive electrode binder is PVDF.
Negative material is one or more mixtures in native graphite, MCMB, polymer charcoal, and cathode conductive agent is one or more mixtures in carbon black, graphite, carbon nano-tube, acetylene black; Negative electrode binder is one or more mixtures in sodium carboxymethylcellulose, SBR rubber.
A kind of preparation method with higher-security lithium ion battery, after positive electrode, positive electrode binder and positive conductive agent are mixed into slip, metal collector adopts dual coating technique, coating temperature is 90 ~ 145 DEG C, coating speed: 1 ~ 3m/min, after pole piece drying, after roll-in, form the pole piece that thickness is 100 ~ 150 μm, compacted density 3.0 ~ 3.8g/cm 3, above-mentioned positive plate contacts with cover plate; After negative material, negative electrode binder and cathode conductive agent are mixed into slip, metal collector adopts dual coating technique, coating temperature is 90 ~ 145 DEG C, coating speed: 1 ~ 3m/min, after pole piece drying, the pole piece that thickness is 90 ~ 130 μm is formed, compacted density 1.2 ~ 1.7g/cm after roll-in 3, above-mentioned negative plate and body contact; Battery cathode, barrier film and positive pole reel, by coated for the coating film being wound into the insulation of rectangular battery, insert battery container, positive pole aluminium pole ears contacts with battery Aluminum cover, negative pole nickel lug contacts with battery container, in battery container, inject electrolyte solution.
Described electrolyte is by electrolyte and solvent composition, and wherein electrolyte is one or more in lithium hexafluoro phosphate, trifluoromethyl sulfonic acid lithium, lithium perchlorate; Solvent is one or more in dimethyl carbonate, ethylene carbonate, propene carbonate.
Beneficial effect of the present invention:
1. the raw material used are identical with conventional lithium-ion battery, can not increase extra cost.
2. present invention process is simple, easy controls and operation, and safety and stability is good, easily realizes industrial-scale production.
3. battery of the present invention has good chemical property and processing characteristics.
4. battery structure of the present invention is stablized, better with compatibility of electrolyte, has good recycling.
5. lithium ion battery has higher fail safe, is applicable to the field high to battery request, has broad application prospects.
Polyimide diaphragm has excellent resistant of high or low temperature, electric insulating quality, caking property, radiation resistance, resistance to medium, can in the temperature range of-269 ~ 280 DEG C Long-Time Service, the high temperature of 400 DEG C can be reached in short-term.When 20 DEG C, hot strength is 200MPa, is greater than 100MPa when 200 DEG C.Therefore, make the barrier film of lithium battery of PI barrier film, when battery temperature is higher, the contraction that barrier film can not occur damages, thus can improve the fail safe of lithium ion battery.The lithium ion battery that the present invention produces has higher fail safe,
The field higher to security requirement can be widely used in, comprise the various electrical appliances of electric automobile, battery-operated motor cycle, electric bicycle, electronic toy, digital camera, video camera, notebook computer, mobile phone, intelligent chip etc.
Accompanying drawing explanation
Fig. 1 is the outline drawing of lithium ion battery of the present invention;
Fig. 2 is the rate discharge curves of lithium ion battery of the present invention;
Fig. 3 is the cyclic curve of lithium ion battery of the present invention;
Fig. 4 is the temperature-voltage curve of lithium ion battery of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details:
As shown in Figure 1, the present invention it comprise positive plate 1, negative plate 2, barrier film 3, coating film 4, housing 5, positive pole aluminium pole ears 6, cover plate 7, negative pole nickel lug 8.Positive plate, negative plate, membrane coil are coiled into battery core, blend compounds band glues, the battery gluing adhesive tape is loaded in metal battery shell 5 along long limit, battery core is carried out coated by coating film, and metal shell 5 insulate, and is welded by the positive pole aluminium pole ears of battery core with cover plate, negative pole nickel lug and case weld, adopt Laser Welding to be welded with cover plate by metal shell, welded rear filling electrolyte, changed into, obtained the lithium ion battery with high security.
Embodiment 1
1. cobalt acid lithium (91.5%), conductive black ((3%), carbon nano-tube (2%), PVDF (3.5%) mixed grinding, are dried premix, are made positive pole powder.By mixed positive pole powder, (deionized water of (5%) mixes with acrylic polymer, make slurry, viscosity is between 7000 ~ 9000mPaS, slurry is coated on the two sides of aluminium foil, at 130 DEG C after drying, roll-in, forms the pole piece that thickness is 125 μm after roll-in, and its compacted density is 3.5g/cm 3, obtain anode pole piece.
2. native graphite (93%), conductive carbon black (3%) mix with the deionized water containing CMC (1.5%), butadiene-styrene rubber (2.5%) binding agent, make slurry, viscosity is between 3500 ~ 5000mPaS, slurry is coated on equably the two sides of Copper Foil, at 120 DEG C after drying, roll-in, forms the pole piece that thickness is 105 μm after roll-in, and its compacted density is 1.5g/cm 3, obtain negative plate.Above-mentioned positive and negative plate is reduced.
3. the concrete size of battery pole piece is as follows:
Anode pole piece size (mm): 600 × 55 × 0.125
Cathode pole piece size (mm): 640 × 57 × 0.105
Diaphragm size (mm): 1650 × 61 × 0.025
4. by negative pole, barrier film, positive pole, be wound into rectangle battery core, by this battery after tab welding 90 DEG C of vacuumizes 24 hours, wherein positive pole aluminium pole ears contacts with battery Aluminum cover, and negative pole nickel lug contacts with battery container.
5. in drying shed, add electrolyte, inject that electrolyte is 1mol/L LiPF6/EC+DMC+EMC (volume ratio 1:1:1), volume is 17ml.
6. battery is through 45 DEG C, after 24h is aging, changes into, and carries out multiplying power test, cyclic test, safety testing after changing into.
7. when battery carries out acupuncture, battery safety valve is washed open, and battery temperature rises, and be up to 312 DEG C, battery does not burn, and does not explode.
As shown in Figure 2, embodiment 1 prepares the rate discharge curves of lithium ion battery;
As shown in Figure 3, embodiment 1 prepares the cyclic curve of lithium ion battery;
As shown in Figure 4, embodiment 1 prepares the temperature-voltage curve of lithium ion battery.

Claims (6)

1. there is a higher-security lithium ion battery, it is characterized in that: the weight percentage ranges of anode sizing agent: positive electrode: 85% ~ 95%, positive conductive agent: 5% ~ 10%, positive electrode binder: 3% ~ 8%; The weight percentage ranges of cathode size: negative material: 88% ~ 95%, cathode conductive agent: 6% ~ 10%, negative electrode binder: 4% ~ 8%; Barrier film is polyimide diaphragm.
2. one according to claim 1 has higher-security lithium ion battery, it is characterized in that: described membrane thicknesses is 20 ~ 40.
3. one according to claim 1 has higher-security lithium ion battery, it is characterized in that: positive electrode is cobalt acid lithium, and positive conductive agent is one or more in carbon black, graphite, carbon nano-tube, acetylene black, and positive electrode binder is PVDF.
4. one according to claim 1 has higher-security lithium ion battery, it is characterized in that: negative material is one or more mixtures in native graphite, MCMB, polymer charcoal, cathode conductive agent is one or more mixtures in carbon black, graphite, carbon nano-tube, acetylene black; Negative electrode binder is one or more mixtures in sodium carboxymethylcellulose, SBR rubber.
5. a kind of preparation method with higher-security lithium ion battery as described in one of claim 1-4, it is characterized in that: after positive electrode, positive electrode binder and positive conductive agent are mixed into slip, metal collector adopts dual coating technique, coating temperature is 90 ~ 145 DEG C, coating speed: 1 ~ 3m/min, after pole piece drying, forms the pole piece that thickness is 100 ~ 150 μm after roll-in, compacted density 3.0 ~ 3.8g/cm3, above-mentioned positive plate contacts with cover plate; After negative material, negative electrode binder and cathode conductive agent are mixed into slip, metal collector adopts dual coating technique, coating temperature is 90 ~ 145 DEG C, coating speed: 1 ~ 3m/min, after pole piece drying, the pole piece that thickness is 90 ~ 130 μm is formed, compacted density 1.2 ~ 1.7g/cm3, above-mentioned negative plate and body contact after roll-in; Battery cathode, barrier film and positive pole reel, by coated for the coating film being wound into the insulation of rectangular battery, insert battery container, positive pole aluminium pole ears contacts with battery Aluminum cover, negative pole nickel lug contacts with battery container, in battery container, inject electrolyte solution.
6. a kind of preparation method with higher-security lithium ion battery according to claim 5, it is characterized in that: described electrolyte is by electrolyte and solvent composition, and wherein electrolyte is one or more in lithium hexafluoro phosphate, trifluoromethyl sulfonic acid lithium, lithium perchlorate; Solvent is one or more in dimethyl carbonate, ethylene carbonate, propene carbonate.
CN201410816290.7A 2014-12-25 2014-12-25 Lithium ion battery with relatively high safety and preparation method thereof Pending CN104538668A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852091A (en) * 2015-05-25 2015-08-19 华健 Lithium ion battery capable of leading tabs out in same direction and preparation method of lithium ion battery
CN108346816A (en) * 2017-01-22 2018-07-31 微宏动力系统（湖州）有限公司 A kind of lithium rechargeable battery and preparation method thereof
CN109244335A (en) * 2018-10-31 2019-01-18 贵州梅岭电源有限公司 A kind of polyimide diaphragm lithium-sulfur cell and preparation method thereof
CN113629363A (en) * 2021-08-10 2021-11-09 天科新能源有限责任公司 Battery cell structure and energy storage module for preventing thermal runaway from rapidly expanding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101651233A (en) * 2008-08-14 2010-02-17 比亚迪股份有限公司 Lithium ion secondary battery and preparation method thereof
CN103441305A (en) * 2013-08-27 2013-12-11 深圳市贝特瑞新能源材料股份有限公司 Power and energy storage lithium-ion battery and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101651233A (en) * 2008-08-14 2010-02-17 比亚迪股份有限公司 Lithium ion secondary battery and preparation method thereof
CN103441305A (en) * 2013-08-27 2013-12-11 深圳市贝特瑞新能源材料股份有限公司 Power and energy storage lithium-ion battery and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852091A (en) * 2015-05-25 2015-08-19 华健 Lithium ion battery capable of leading tabs out in same direction and preparation method of lithium ion battery
CN108346816A (en) * 2017-01-22 2018-07-31 微宏动力系统（湖州）有限公司 A kind of lithium rechargeable battery and preparation method thereof
CN109244335A (en) * 2018-10-31 2019-01-18 贵州梅岭电源有限公司 A kind of polyimide diaphragm lithium-sulfur cell and preparation method thereof
CN113629363A (en) * 2021-08-10 2021-11-09 天科新能源有限责任公司 Battery cell structure and energy storage module for preventing thermal runaway from rapidly expanding

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Application publication date: 20150422

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