CN104505533A - Gel electrolyte, lithium ion battery and preparation method for lithium ion battery - Google Patents
Gel electrolyte, lithium ion battery and preparation method for lithium ion battery Download PDFInfo
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- CN104505533A CN104505533A CN201510035316.9A CN201510035316A CN104505533A CN 104505533 A CN104505533 A CN 104505533A CN 201510035316 A CN201510035316 A CN 201510035316A CN 104505533 A CN104505533 A CN 104505533A
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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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
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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
- H01M2300/00—Electrolytes
- H01M2300/0085—Immobilising or gelification of electrolyte
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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
Abstract
The invention discloses gel electrolyte, a lithium ion battery including the gel electrolyte, and a preparation method for the lithium ion battery. The gel electrolyte comprises gel electrolyte matrix and liquid electrolyte, and the gel electrolyte matrix is selected from one or two of fumed silica and nano-silicon dioxide. One or both of the fumed silica and nano-silicon dioxide can form a stable silicon dioxide framework structure in the lithium ion battery, the electrolyte is adsorbed on the framework structure, lithium ions can freely transmit in the battery, the performance of the lithium ion battery is improved, and the safety is higher. The lithium ion battery prepared by the preparation method has better safety and hardness.
Description
Technical field
The present invention relates to lithium ion battery metal field, particularly relate to the preparation method of a kind of gel electrolyte, lithium ion battery and lithium ion battery.
Background technology
Lithium ion battery is widely used in consumer electronics power supply owing to having the advantage such as high-energy-density, nothing " memory " effect.Lithium ion battery manufacturing technology is increasingly mature, and its application is also gradually to electrical source of power, startup power supply and accumulation power supply expansion.Due to the requirement that consumer electronics power supply purposes is different, and the intelligentized development of consumer electronics, lithium ion battery needs to have higher security performance and longer useful life.
Lithium ion battery in the market all adopts organic system liquid electrolyte, easily there is leakage problem in extreme circumstances in this battery, on the other hand due to lithium-ion battery electrolytes burning-point and boiling point low, in use its internal resistance constantly increases, in charge and discharge process, internal temperature of battery raises, and very easily occurs the safety problems such as blast on fire; The consumption of electrolyte simultaneously also makes battery reduce.The effective scheme that organic system liquid electrolyte is considered to solve the problem is substituted with polymer gel electrolyte.
Existing gel electrolyte generally adds polymerisable monomer and is prepared from liquid electrolyte.In the exploitation of gel electrolyte lithium ion battery, polymer gel electrolyte has multiple preparation method, is mainly: porous gel polymer dielectric preparation method and homogeneous gel polymer dielectric preparation method.These two kinds of methods are all in the organic environment of plasticizer, and initator is initiated polymerization thing monomer polymerization under extraneous factor (as high temperature) effect, forms the principle of high molecular polymer matrix.Current polymer gel electrolyte needs to adopt the organic substance such as plasticizer, initator, and it is unfriendly to environment, easily pollutes, and the manufacturing process of lithium ion battery cell also can be made complicated, and production efficiency is low simultaneously, and quality is difficult to control.
Summary of the invention
The technical problem that the present invention solves there are provided a kind of gel electrolyte, and the gel electrolyte feature of environmental protection that the application provides is good, and makes lithium ion battery have good performance.
In view of this, this application provides a kind of gel electrolyte, comprising: gel electrolyte matrix and liquid electrolyte; Described gel electrolyte matrix be selected from nano silicon and aerosil one or both.
Preferably, described liquid electrolyte is made up of electrolyte lithium salt and organic solvent; Described electrolyte lithium salt be selected from lithium hexafluoro phosphate, lithium perchlorate and LiBF4 one or more; Described organic solvent be selected from ethylene carbonate, propene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and vinylene carbonate one or more.
Preferably, the concentration of electrolyte lithium salt described in described liquid electrolyte is 0.8 ~ 1.5mol/L.
Preferably, the content of described gel electrolyte matrix in described gel electrolyte is 2wt% ~ 40wt%.
Present invention also provides a kind of lithium ion battery, comprise: laminated aluminum film part, be arranged at positive plate and the negative plate of described laminated aluminum film part inside, be arranged at the barrier film between described positive plate and described negative plate, gel electrolyte, described gel electrolyte comprises gel electrolyte matrix and liquid electrolyte, described gel electrolyte matrix be selected from nano silicon and aerosil one or both.
Preferably, described positive plate comprises positive electrode active materials, positive conductive agent, positive pole thickener and positive electrode binder; Described positive electrode active materials be cobalt acid lithium, lithium nickelate, lithium nickel cobalt dioxide, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, LiFePO4, lithium manganese phosphate and phosphoric acid vanadium lithium in one or more, described positive conductive agent is one or more in carbon black, graphite, carbon nano-tube and Graphene, described positive pole thickener is carboxymethyl cellulose, and described positive electrode binder is one or more in the copolymer of polytetrafluoroethylene, styrene and butadiene.
Preferably, described negative plate comprises negative active core-shell material, cathode conductive agent, negative pole thickener and negative electrode binder; Described negative active core-shell material is one or more of native graphite, Delanium, hard carbon, soft carbon, MCMB, silicon grain, silicon line, silicon rod, the sub-silicon of oxidation, the silicon grain of Graphene parcel, the silicon grain depended in carbon nano-tube, silicon-base alloy powder, tin ash, lithium titanate and tin particles.
Present invention also provides a kind of preparation method of lithium ion battery, comprise the following steps:
A), gel electrolyte matrix powder is mixed with water, obtains dispersion liquid; Described gel electrolyte matrix is one or both in nano silicon and aerosil;
B), be filled into by described dispersion liquid in power brick pack, the battery battery core during described power brick is packed infiltrates, and the battery battery core after baking infiltrates, obtains the battery core containing gel electrolyte matrix after cooling;
C), in step B) pour into electrolyte in the battery core that obtains, encapsulation, obtains lithium ion battery.
Preferably, the viscosity of described dispersion liquid is 3000CP ~ 9000CP.
Preferably, the preparation process of described power brick pack is specially:
Positive plate, negative plate and barrier film are reeled, obtains battery battery core;
Described battery battery core is placed in laminated aluminum film bag, encapsulates described laminated aluminum film bag and make side be in open state, obtain power brick pack.
This application provides a kind of gel electrolyte, it comprises gel electrolyte matrix and liquid electrolyte; Described gel electrolyte matrix be selected from nano silicon and aerosil one or both.The application's gel electrolyte matrix introduce nano silicon and aerosil in one or both, it can form silicon dioxide skeleton structure at inside battery, form the center rest of inside battery pole piece and barrier film, electrolyte can be adsorbed in skeleton structure, lithium ion in battery is transmitted, and is conducive to the raising of hardness of lithium ion cell; And there is stable electrochemical properties and thermal stability due to silicon dioxide, temperature and the battery security of battery internal structure in charge and discharge process can be improved, and make lithium ion battery have good performance.Aerosil and nano silicon are all inorganic material of nontoxic pollution-free simultaneously, thus make gel electrolyte have good environment-friendly type.
In addition, present invention also provides the preparation method of lithium ion battery, in manufacturing process, the production process of lithium ion battery is few, and the organic introducing such as no initiator, plasticizer, and the feature of environmental protection is good, and make the fail safe of lithium ion battery and hardness higher.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The embodiment of the invention discloses a kind of gel electrolyte, comprising: gel electrolyte matrix and liquid electrolyte; Described gel electrolyte matrix be selected from nano silicon and aerosil one or both.
This application provides a kind of gel electrolyte, wherein the matrix of gel electrolyte is one or both in nano silicon and aerosil, it is dissolved in liquid electrolyte, supporting structure can be formed at inside battery, and forming the center rest of inside battery pole piece and barrier film, electrolyte is also adsorbable on support, does not flow, lithium ion is freely transmitted, and does not affect the performance of lithium ion battery; Above-mentioned gel electrolyte does not introduce initator or plasticizer, and makes gel electrolyte environment-friendly type better, and due to silicon dioxide be a kind of stable material, lithium ion battery can be made to have good performance.
According to the present invention, gel electrolyte comprises gel electrolyte matrix and liquid electrolyte, described gel electrolyte matrix be selected from nano silicon and aerosil one or both.Wherein, described nano silicon is a kind of inorganic chemical industry material, be commonly called as white carbon, be of a size of 1nm ~ 100nm, it is a kind of unformed white powder, nontoxic, tasteless, pollution-free, micro-structural is spherical, in cotton-shaped and netted accurate grain structure, nanometer titanium dioxide carbon is dissolved in liquid electrolyte, can form gel.Described aerosil is a kind of white, nonpoisonous and tasteless inorganic powder material, and its atom particle diameter is 7 ~ 40nm.Described liquid electrolyte is made up of electrolyte lithium salt and organic solvent; Described electrolyte lithium salt be preferentially selected from lithium hexafluoro phosphate, lithium perchlorate and LiBF4 one or more; Described organic solvent be preferentially selected from ethylene carbonate, propene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and vinylene carbonate one or more.In described liquid electrolyte, the concentration of electrolyte lithium salt is preferably 0.8 ~ 1.5mol/L.The content of described gel electrolyte matrix in described gel electrolyte is preferably 2wt% ~ 40wt%, is more preferably 5wt% ~ 32wt%, most preferably is 12wt% ~ 21wt%.Described gel electrolyte matrix content then can affect battery volume energy density too much, unit volume inner capacities is caused to reduce, described gel electrolyte matrix content then effectively can not form support at inside battery very little, can not adsorb abundant liquid electrolyte, and affect battery performance.One or both and liquid electrolyte in described aerosil and nano silicon can form gel electrolyte, and form silicon dioxide skeleton structure at inside battery, form the center rest of inside battery pole piece and barrier film, electrolyte is adsorbed in framework, can not flow, but not affect the transmission of lithium ion battery.
Present invention also provides a kind of lithium ion battery, it comprises: laminated aluminum film part, is arranged at positive plate and the negative plate of described laminated aluminum film part inside, is arranged at the barrier film between described positive plate and described negative plate, gel electrolyte; Described gel electrolyte comprises gel electrolyte matrix and liquid electrolyte.
According to the present invention, described positive plate comprises positive electrode active materials, positive conductive agent, positive pole thickener and positive electrode binder.Described positive electrode active materials be preferably cobalt acid lithium, lithium nickelate, lithium nickel cobalt dioxide, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, LiFePO4, lithium manganese phosphate and phosphoric acid vanadium lithium in one or more, in certain embodiments, described positive electrode active materials is more preferably one or more in cobalt acid lithium, lithium nickel cobalt dioxide, LiMn2O4 and phosphoric acid vanadium lithium.Described positive conductive agent be preferably in carbon black, graphite, carbon nano-tube and Graphene one or more.Described positive pole thickener is preferably carboxymethyl cellulose.Described positive electrode binder be preferably in the copolymer of polytetrafluoroethylene, styrene and butadiene one or more.
Described negative plate comprises negative active core-shell material, cathode conductive agent, negative pole thickener and negative electrode binder.Described negative active core-shell material is preferably one or more of native graphite, Delanium, hard carbon, soft carbon, MCMB, silicon grain, silicon line, silicon rod, the sub-silicon of oxidation, the silicon grain of Graphene parcel, the silicon grain depended in carbon nano-tube, silicon-base alloy powder, tin ash, lithium titanate and tin particles; In certain embodiments, described negative active core-shell material is more preferably one or more in graphite, MCMB, lithium titanate, silicon grain and tin particles.Described cathode conductive agent be preferably in carbon black, graphite, carbon nano-tube and Graphene one or more.Described negative pole adhesion agent is preferably carboxymethyl cellulose.Described negative electrode binder be preferably in the copolymer of polytetrafluoroethylene, styrene and butadiene one or more.
In above-mentioned lithium ion battery, described gel electrolyte is identical with the gel electrolyte described in such scheme, no longer repeats herein.
The application also provides a kind of preparation method of lithium ion battery, comprises the following steps:
A), gel electrolyte matrix powder is mixed with water, obtains dispersion liquid; Described gel electrolyte matrix is one or both in nano silicon and aerosil;
B), be filled into by described dispersion liquid in power brick pack, the battery battery core during described power brick is packed infiltrates, and the battery battery core after baking infiltrates, obtains the battery core containing gel electrolyte matrix after cooling;
C), in step B) pour into electrolyte in the battery core that obtains, encapsulation, obtains lithium ion battery.
This application provides a kind of preparation method of lithium ion battery.The preparation method of the lithium ion battery that the application provides is without gel method of polymerization, and it first between the positive and negative electrode of electrode group, forms gel electrolyte matrix, and then pours into the process of electrolyte.
According to the present invention, in the process preparing lithium ion battery, first gel electrolyte matrix powder is mixed with water, form gel suspended dispersed liquid.The viscosity of described dispersion liquid is preferably 3000CP ~ 9000CP, and in certain embodiments, the viscosity of described dispersion liquid is more preferably 4200CP ~ 7300CP.The viscosity of described dispersion liquid is too high, and will affect the infiltration of inside battery battery core, viscosity is too low, and in bake process, solvent is not easily dried.In the process preparing dispersion liquid, the mode of described mixing can for stirring, high-speed stirred, ball milling, high speed ball milling and ultrasonic wave disperse in one or more, the application does not do special restriction.The time of described mixing is preferably 20min ~ 150min.The temperature of described mixing is preferably 20 ~ 40 DEG C.
Then described dispersion liquid is filled in power brick pack by the application, and the battery battery core during described power brick is packed infiltrates, and the battery battery core after baking infiltrates, obtains the battery core containing gel electrolyte matrix after cooling.The preparation process of described power brick pack can be prepared by the following method:
Barrier film is placed in after between positive plate and negative plate and reels, obtain battery battery core;
Described battery battery core is placed in laminated aluminum film bag, described laminated aluminum film bag is encapsulated and makes side be in open state.
The bag of laminated aluminum film described in said process is well known to those skilled in the art, and the application does not do special restriction.Describedly be encapsulated as technological means well known to those skilled in the art, the application does not do special restriction.The temperature of described baking is preferably 50 ~ 90 DEG C.
The application finally pours into electrolyte in battery core, and encapsulation, obtains lithium ion battery.Describedly be encapsulated as mode well known to those skilled in the art, the application does not do special restriction.
Dispersion liquid containing gel electrolyte matrix, in the process preparing lithium ion battery, is first filled in power brick pack, battery battery core is infiltrated, and then pours into electrolyte by the application.The preparation process of above-mentioned lithium ion battery is for preparing cell thickness in below 3.5mm cell area at 2000mm
2the lithium ion battery of left and right, can make the hardness of lithium ion battery larger.The battery that, area thin for thickness is large, adopt the battery that common process manufactures, between inside battery both positive and negative polarity and barrier film, space is very large, and electrolyte is in can flow regime, and therefore battery is soft, hardness is low, adopt the preparation technology of the application and gel electrolyte effectively inside battery barrier film and both positive and negative polarity pole piece can be fixed into an entirety, and electrolyte also can be attracted in silicon dioxide framework, can not flow, battery as same plastic the same, intensity is very high.Above-mentioned manufacturing process simultaneously, operation is few, simple to operate, and lithium ion battery quality easily controls, and is easy to large-scale production, and the organic introducing such as no initiator, plasticizer, environmentally friendly, and initator can be avoided to remain the problem causing battery performance to decline.
In order to understand the present invention further, be described in detail below in conjunction with the preparation process of embodiment to gel electrolyte provided by the invention, lithium ion battery, protection scope of the present invention is not limited by the following examples.
Raw material in following examples is commercially available prod.
Embodiment 1
Prepare gel electrolyte: get nano silicon, be that 15:75 mixes by nano silicon and the mass ratio of deionized water, after stirring 60min, put into (the Shanghai section artificial delivery of SK8200HP ultrasonic cleaner, maximum ultrasonic power 500W, operating frequency 53KHz) in, bath temperature controls between 45 ~ 70 DEG C, ultrasonic 60min, obtains the silicon dioxide suspended dispersed liquid of gel, viscosity 7300CP.
Prepare lithium-ion electric core: adopt 465176 aluminum-plastic packaged square empty battery cores, specifying information is: positive pole: active material LiCoO
2content 96wt%, conductive black 2wt%, binding agent SBR1.5wt%, thickener CMC 0.5wt% take aluminium foil as collector; Negative pole: active material 8C, content of graphite 94.4wt%, conductive black 1.5wt%, binding agent SBR 2.5wt%, thickener CMC1.6wt% take Copper Foil as collector; Barrier film is Cellgard2300; Battery design capacity is 2000mAh.
Prepare gel electrolyte battery core: be 25% by the weight percentage of matrix in gel electrolyte of gel electrolyte, above-mentioned silicon dioxide suspended dispersed liquid is injected in above-mentioned empty battery core, then above-mentioned battery core is proceeded in 65 DEG C of insulating boxs and toast 10 hours, take out cool to room temperature, namely the battery core (moisture is lower than 50ppm) containing gel electrolyte matrix is obtained, proceed to glove box, inject liquid electrolyte, obtain lithium ion battery after encapsulation, the size (thickness * width * height) of lithium ion battery is 3.4mm*51mm*76mm.
Embodiment 2
Prepare gel electrolyte: get nano silicon, be that 20:80 mixes by nano silicon and the mass ratio of deionized water, after stirring 60min, put into SK8200HP ultrasonic cleaner, bath temperature controls between 45 ~ 70 DEG C, ultrasonic 60min, obtains gel, viscosity more than the silicon dioxide suspended dispersed liquid of 4200CP.
Prepare lithium-ion electric core: adopt 465176 aluminum-plastic packaged square empty battery cores, specifying information is: positive pole: the content 96wt% of active material LiMn2O4, graphite 2wt%, binding agent PTFE1.5wt%, thickener CMC 0.5wt% take aluminium foil as collector; Negative pole: active material 8C content of graphite 94.4wt%, conductive black 1.5wt%, binding agent PTFE 2.5wt%, thickener CMC1.6wt% take Copper Foil as collector; Barrier film is Cellgard2300; Battery design capacity is 500mAh.
Prepare gel electrolyte battery core: be 40% by the weight percentage of matrix in gel electrolyte of gel electrolyte, above-mentioned silicon dioxide suspended dispersed liquid is injected in above-mentioned empty battery core, then above-mentioned battery core is proceeded in 65 DEG C of insulating boxs and toast 10 hours, take out cool to room temperature, namely the battery core (moisture is lower than 50ppm) containing gel electrolyte matrix is obtained, proceed to glove box, inject liquid electrolyte, obtain lithium ion battery after encapsulation, the size (thickness * width * height) of lithium ion battery is 1.5mm*51mm*76mm.
Comparative example 1
Electrolyte: adopt the liquid electrolyte used in embodiment 1.
Prepare lithium-ion electric core: experiment adopts 465176 aluminum-plastic packaged square empty battery cores, and specifying information is: positive pole: active material LiCoO
2content 96%, conductive black 2%, binding agent SBR 1.5%, thickener CMC 0.5% take aluminium foil as collector; Negative pole: active material 8C, content of graphite 94.4%, conductive black 1.5%, binding agent SBR 2.5%, thickener CMC 1.6% take Copper Foil as collector; Barrier film is Cellgard2300; Battery design capacity is 2000mAh.
Prepare liquid electrolyte battery core: dried above-mentioned empty battery core (water content is lower than 50ppm) is proceeded to glove box, injects above-mentioned liquid electrolyte, after sealing, room temperature leaves standstill more than 48 hours, makes electrolyte fully infiltrate pole piece and barrier film; Then above-mentioned battery core proceeded in 80 DEG C of insulating boxs and toast 6 hours, cool to room temperature under taking-up dry environment, namely obtains lithium ion battery.
The performance of lithium ion battery prepared by detection embodiment and comparative example, the performance of lithium ion battery is as shown in table 1, and the detection of performance of lithium ion battery can be undertaken by following detection mode:
Hardness test: adopt Chinese invention patent application: the device and method of 201210484512.0 publicities carries out.
Capacity and loop test: battery 0.5C constant current charge is to 4.2V, then constant voltage is decreased to 0.02C to electric current; Static 10min, 0.5C discharge into 3.0V, record discharge capacity and discharge curve, static 10min; Repeat above-mentioned steps repeatedly.
High rate performance is tested: under the condition of ambient temperature (23 ± 2) DEG C, 0.5C constant current charge is to 4.2V, then constant voltage is decreased to 0.02C to electric current; Static 10min, with 0.2C/2C constant-current discharge to 3.0V.2C discharge capacity is divided by 0.2C discharge capacity, and gained percentage more high rate capability is better.
Drift bolt is tested: stainless steel lag screws, diameter 2.5mm, steel nail fltting speed 10mm/S, closes on multichannel temperature logger test the temperature curve that battery core pierces through portion.Record battery core heating curve and peak temperature, observes battery core whether catching fire.
The performance data table of lithium ion battery prepared by table 1 embodiment and comparative example
Result as can be seen from table 1, under same test condition, compare embodiment 1 and the comparative example 1 of identical liquid electrolyte, initial capacity and liquid electrolyte solution battery are in same level, but after 500 charge and discharges circulation, gel electrolyte battery reserve capacity in embodiment all higher than liquid electrolyte solution battery, capacity retention rate 90%; In drift bolt experiment, gel electrolyte does not all catch fire, and the general peak temperature of battery core is lower than liquid state batteries nearly 20 DEG C, and liquid electrolyte solution battery has the ratio that catches fire of 40%, and the security performance of gel electrolyte battery is better than liquid electrolyte solution battery; In hardness test, embodiment gel electrolyte battery core hardness ratio liquid electrolyte battery core improves nearly 300%, compensate for very thin thickness liquid aluminium plastic film soft-package battery intensity very low, cannot meet the shortcoming of intelligent mobile phone battery and dull and stereotyped computer battery requirement.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection range of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a gel electrolyte, is characterized in that, comprising: gel electrolyte matrix and liquid electrolyte; Described gel electrolyte matrix be selected from nano silicon and aerosil one or both.
2. gel electrolyte according to claim 1, is characterized in that, described liquid electrolyte is made up of electrolyte lithium salt and organic solvent; Described electrolyte lithium salt be selected from lithium hexafluoro phosphate, lithium perchlorate and LiBF4 one or more; Described organic solvent be selected from ethylene carbonate, propene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and vinylene carbonate one or more.
3. gel electrolyte according to claim 2, is characterized in that, the concentration of electrolyte lithium salt described in described liquid electrolyte is 0.8 ~ 1.5mol/L.
4. gel electrolyte according to claim 1, is characterized in that, the content of described gel electrolyte matrix in described gel electrolyte is 2wt% ~ 40wt%.
5. a lithium ion battery, comprise: laminated aluminum film part, be arranged at positive plate and the negative plate of described laminated aluminum film part inside, be arranged at the barrier film between described positive plate and described negative plate, gel electrolyte, it is characterized in that, described gel electrolyte comprises gel electrolyte matrix and liquid electrolyte, described gel electrolyte matrix be selected from nano silicon and aerosil one or both.
6. lithium ion battery according to claim 5, is characterized in that, described positive plate comprises positive electrode active materials, positive conductive agent, positive pole thickener and positive electrode binder; Described positive electrode active materials be cobalt acid lithium, lithium nickelate, lithium nickel cobalt dioxide, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, LiFePO4, lithium manganese phosphate and phosphoric acid vanadium lithium in one or more, described positive conductive agent is one or more in carbon black, graphite, carbon nano-tube and Graphene, described positive pole thickener is carboxymethyl cellulose, and described positive electrode binder is one or more in the copolymer of polytetrafluoroethylene, styrene and butadiene.
7. lithium ion battery according to claim 5, is characterized in that, described negative plate comprises negative active core-shell material, cathode conductive agent, negative pole thickener and negative electrode binder; Described negative active core-shell material is one or more of native graphite, Delanium, hard carbon, soft carbon, MCMB, silicon grain, silicon line, silicon rod, the sub-silicon of oxidation, the silicon grain of Graphene parcel, the silicon grain depended in carbon nano-tube, silicon-base alloy powder, tin ash, lithium titanate and tin particles.
8. a preparation method for lithium ion battery, comprises the following steps:
A), gel electrolyte matrix powder is mixed with water, obtains dispersion liquid; Described gel electrolyte matrix is one or both in nano silicon and aerosil;
B), be filled into by described dispersion liquid in power brick pack, the battery battery core during described power brick is packed infiltrates, and the battery battery core after baking infiltrates, obtains the battery core containing gel electrolyte matrix after cooling;
C), in step B) pour into electrolyte in the battery core that obtains, encapsulation, obtains lithium ion battery.
9. preparation method according to claim 8, is characterized in that, the viscosity of described dispersion liquid is 3000CP ~ 9000CP.
10. preparation method according to claim 8, is characterized in that, the preparation process of described power brick pack is specially:
Positive plate, negative plate and barrier film are reeled, obtains battery battery core;
Described battery battery core is placed in laminated aluminum film bag, encapsulates described laminated aluminum film bag and make side be in open state, obtain power brick pack.
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| CN105977523A (en) * | 2016-07-06 | 2016-09-28 | 无锡市宝来电池有限公司 | Lithium ion electrolyte and lithium ion battery |
| CN106025351A (en) * | 2016-07-06 | 2016-10-12 | 无锡市宝来电池有限公司 | Lithium ion electrolyte safe to use and lithium ion battery |
| WO2018041709A1 (en) * | 2016-08-30 | 2018-03-08 | Rhodia Operations | Solid-liquid electrolyte for use in a battery |
| CN108075181A (en) * | 2016-11-14 | 2018-05-25 | 中国科学院上海硅酸盐研究所 | A kind of solid-state or colloidal state water-system alkali metal ion battery and preparation method thereof |
| CN108270031A (en) * | 2016-12-30 | 2018-07-10 | 财团法人工业技术研究院 | colloidal electrolyte and application thereof |
| CN109004263A (en) * | 2018-07-25 | 2018-12-14 | 湖南立方新能源科技有限责任公司 | A kind of electrolyte and the high security lithium ion battery containing the electrolyte |
| CN113270640A (en) * | 2021-05-12 | 2021-08-17 | 徐文忠 | Solid electrolyte |
| CN113451664A (en) * | 2020-03-24 | 2021-09-28 | 东营市海科新源化工有限责任公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and lithium ion battery |
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| CN105977523A (en) * | 2016-07-06 | 2016-09-28 | 无锡市宝来电池有限公司 | Lithium ion electrolyte and lithium ion battery |
| CN106025351A (en) * | 2016-07-06 | 2016-10-12 | 无锡市宝来电池有限公司 | Lithium ion electrolyte safe to use and lithium ion battery |
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| CN109643807A (en) * | 2016-08-30 | 2019-04-16 | 罗地亚经营管理公司 | For the solid-liquid electrolyte in battery |
| CN108075181A (en) * | 2016-11-14 | 2018-05-25 | 中国科学院上海硅酸盐研究所 | A kind of solid-state or colloidal state water-system alkali metal ion battery and preparation method thereof |
| CN108270031A (en) * | 2016-12-30 | 2018-07-10 | 财团法人工业技术研究院 | colloidal electrolyte and application thereof |
| CN109004263A (en) * | 2018-07-25 | 2018-12-14 | 湖南立方新能源科技有限责任公司 | A kind of electrolyte and the high security lithium ion battery containing the electrolyte |
| CN109004263B (en) * | 2018-07-25 | 2022-08-26 | 湖南立方新能源科技有限责任公司 | Electrolyte and high-safety lithium ion battery containing same |
| CN113451664A (en) * | 2020-03-24 | 2021-09-28 | 东营市海科新源化工有限责任公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and lithium ion battery |
| CN113451664B (en) * | 2020-03-24 | 2023-01-24 | 东营市海科新源化工有限责任公司 | Thermally-excited active safety mechanism flame-retardant microcapsule, preparation method thereof and lithium ion battery |
| CN113270640A (en) * | 2021-05-12 | 2021-08-17 | 徐文忠 | Solid electrolyte |
| WO2023138528A1 (en) * | 2022-01-21 | 2023-07-27 | 戴文韬 | Silicon negative electrode material and high-capacity fast-charging battery using same |
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