CN112952293B - Explosion-proof low-internal-resistance lithium ion battery and preparation method thereof - Google Patents
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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
- H01M10/056—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
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic 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 an explosion-proof low-internal-resistance lithium ion battery and a preparation method thereof, the explosion-proof low-internal-resistance lithium ion battery comprises a battery body and electrolyte, the battery body comprises a positive plate, a negative plate, a diaphragm and an aluminum shell, a ceramic coating is coated on one side, close to the positive plate, of the diaphragm, a graphene coating is coated on one side, close to the negative plate, of the diaphragm, the diaphragm is a polyolefin-based film, the diaphragm is positioned between the positive plate and the negative plate, and the diaphragm is filled in the middle of the positive plate and the negative plate and then wound to form a cylinder shape. According to the explosion-proof low-internal-resistance lithium ion battery and the preparation method thereof, the ceramic coating is coated on one side, close to the positive plate, of the diaphragm, the graphene coating is coated on one side, close to the negative plate, of the diaphragm, the ceramic coating and the graphene coating are respectively coated on the front side and the back side of the diaphragm, the conductivity of the negative plate is improved by graphene, the internal resistance of the negative plate is reduced, and the normal exertion of the battery capacity and the stability of the cycle performance are ensured.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an explosion-proof low-internal-resistance lithium ion battery and a preparation method thereof.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by means of lithium ions moving between a positive electrode and a negative electrode, and lithium ions are inserted and extracted back and forth between the two electrodes during charge and discharge: lithium ions are released from a positive electrode and are inserted into a negative electrode through an electrolyte, the negative electrode is in a lithium-rich state, the negative electrode is opposite to the lithium-rich state in discharging, a mobile phone battery is generally a lithium ion battery, the lithium ion battery consists of the positive electrode, the negative electrode, a diaphragm and electrolyte, the positive electrode and the negative electrode are immersed in the electrolyte, the lithium ions move between the positive electrode and the negative electrode by taking the electrolyte as a medium, the charging and discharging of the battery are realized, the positive electrode and the negative electrode are required to be separated by the diaphragm in order to avoid short circuit of the positive electrode and the negative electrode through the electrolyte, the lithium battery is divided into the lithium battery and the lithium ion battery, the mobile phone and the notebook computer use all lithium ion batteries, commonly called lithium batteries, the battery generally adopts materials containing lithium elements as electrodes, is a representative of a modern high-performance battery, and a real lithium battery is rarely applied to daily electronic products due to high dangerousness, and the lithium ion battery is divided into a liquid lithium ion battery and a polymer lithium ion battery according to the difference of electrolyte materials used by the lithium ion battery.
The existing lithium ion battery generally adopts a lithium iron phosphate material, but the existing lithium iron phosphate material is poor in conductivity, so that the lithium ion diffusion speed is low, the internal resistance of the battery is changed greatly in the process of charging and discharging the battery, gas is easy to produce in high-temperature storage, the explosion-proof performance is poor, potential safety hazards exist, the performance of the battery is influenced, and the service life of the battery is shortened.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an explosion-proof low-internal-resistance lithium ion battery and a preparation method thereof, and solves the problems that in the process of charging and discharging the battery, the internal resistance of the battery is changed greatly, gas is easy to produce in high-temperature storage, the explosion-proof performance is poor, potential safety hazards exist, the performance of the battery is influenced and the service life of the battery is shortened due to poor conductive performance and low lithium ion diffusion speed.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides an explosion-proof low internal resistance lithium ion battery, includes battery body and electrolyte, the battery body includes positive plate, negative plate and diaphragm, the diaphragm is close to one side coating of positive plate and has ceramic coating, the diaphragm is close to one side coating of negative plate and has graphene coating, the diaphragm is the polyolefin based membrane, the diaphragm is located between positive plate and the negative plate, coil up after adding the pad diaphragm in the middle of positive plate and the negative plate and form cylindrically, the installation direction of positive plate and negative plate is opposite.
Preferably, the electrolyte comprises the following raw materials in parts by weight: 40-50 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 25-45 parts of an organic solvent, 3-7 parts of bis (trifluoromethylsulfonyl) imide lithium, 4-8 parts of an impedance film forming agent, 1-3 parts of fluoroethyl methyl carbonate, 2-6 parts of chlorinated polyethylene and 0.5-0.9 part of an antioxidant;
the organic solvent is one or more of dimethyl carbonate, ethylene carbonate and methyl propyl carbonate, the impedance film forming agent is one of alcohol ester twelve and ethylene glycol, and the antioxidant is one or more of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide and pentaerythritol tetrakis [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionate ].
Preferably, the raw material components of the electrolyte specifically include: 45 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 35 parts of an organic solvent, 5 parts of lithium bis (trifluoromethylsulfonyl) imide, 6 parts of an impedance film forming agent, 2 parts of fluoroethyl methyl carbonate, 4 parts of chlorinated polyethylene and 0.7 part of an antioxidant.
Preferably, the raw material components of the electrolyte specifically include: 40 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 25 parts of an organic solvent, 3 parts of lithium bis (trifluoromethylsulfonyl) imide, 4 parts of an impedance film forming agent, 1 part of fluoroethyl methyl carbonate, 2 parts of chlorinated polyethylene and 0.5 part of an antioxidant.
Preferably, the raw material components of the electrolyte specifically include: 50 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 45 parts of an organic solvent, 7 parts of lithium bis (trifluoromethylsulfonyl) imide, 8 parts of an impedance film forming agent, 3 parts of fluoroethyl methyl carbonate, 6 parts of chlorinated polyethylene and 0.9 part of an antioxidant.
The invention also discloses a preparation method of the explosion-proof low-internal-resistance lithium ion battery, which comprises the following steps:
s1, firstly, coating a ceramic coating on one surface of a diaphragm, airing the ceramic coating to form a ceramic coating, then coating a graphene coating on the other surface of the diaphragm, and airing the graphene coating to form a graphene coating;
s2, preparing one of lithium hexafluorophosphate and lithium tetrafluoroborate serving as raw materials of electrolyte, an organic solvent, lithium bis (trifluoromethylsulfonyl) imide and an impedance film forming agent according to a proportion, putting the components into a reaction kettle, stirring at a temperature of 80-95 ℃ and a stirring speed of 2100-2300r/min for 5-8 minutes, and uniformly stirring the components;
s3, after the first-stage stirring is completed, the components of fluoroethyl methyl carbonate, chlorinated polyethylene and an antioxidant are prepared according to the proportion, and are put into a reaction kettle for stirring, wherein the temperature of the reaction kettle is 90-96 ℃, the stirring speed is 2000-2300r/min, and the stirring time is 3-5 minutes, so that the preparation of the electrolyte is completed;
s4, assembling the processed positive plate, the processed negative plate, the processed diaphragm and the aluminum shell, winding the positive plate and the processed negative plate after the diaphragm is placed between the positive plate and the processed negative plate, assembling the positive plate and the processed negative plate into the aluminum shell, and then injecting the electrolyte to complete the preparation of the lithium-ion battery.
(III) beneficial effects
The invention provides an explosion-proof low-internal-resistance lithium ion battery and a preparation method thereof. Compared with the prior art, the method has the following beneficial effects:
(1) According to the explosion-proof low-internal-resistance lithium ion battery and the preparation method thereof, the ceramic coating is coated on one side, close to the positive plate, of the diaphragm, the graphene coating is coated on one side, close to the negative plate, of the diaphragm, and the ceramic coating and the graphene coating are coated on the front side and the back side of the diaphragm respectively, so that the conductivity of the negative plate is improved, the internal resistance of the negative plate is reduced, and the normal exertion of the battery capacity and the stability of the cycle performance are ensured.
(2) The explosion-proof low-internal resistance lithium ion battery and the preparation method thereof comprise the following raw materials in parts by weight: 40-50 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 25-45 parts of organic solvent, 3-7 parts of bis (trifluoromethylsulfonyl) imide lithium, 4-8 parts of impedance film forming agent, 1-3 parts of fluoroethyl methyl carbonate, 2-6 parts of chlorinated polyethylene and 0.5-0.9 part of antioxidant, and the electrolyte is added with the bis (trifluoromethylsulfonyl) imide lithium during preparation, so that the battery has more stable cycle performance, higher internal resistance inhibition, better conductivity, no corrosion effect under higher voltage and longer service life of the battery.
(3) According to the explosion-proof low-internal-resistance lithium ion battery and the preparation method thereof, the arrangement of the impedance film forming agent is beneficial to the diffusion of lithium ions, and the addition of fluoroethyl methyl carbonate and chlorinated polyethylene ensures that the battery is not exploded due to excessive gas generation in the high-temperature storage process of the battery, so that the potential safety hazard is reduced.
Drawings
FIG. 1 is a perspective view of the structure of the present invention;
FIG. 2 is a cross-sectional view of the structure of the present invention;
FIG. 3 is an exploded view of the structure of the present invention;
FIG. 4 is a cross-sectional view of a diaphragm structure of the present invention;
FIG. 5 is a chart of comparative experimental data statistics of the present invention.
In the figure, a battery body, an 11 positive plate, a 12 negative plate, a 13 diaphragm, a 15 ceramic coating and a 16 graphene coating are arranged in the figure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, the embodiments of the present invention provide three technical solutions: the utility model provides an explosion-proof low internal resistance lithium ion battery, including battery body 1 and electrolyte, battery body 1 includes positive plate 11, negative plate 12, diaphragm 13, and diaphragm 13 is close to positive plate 11's one side coating has ceramic coating 15, and diaphragm 13 is close to negative plate 12's one side coating has graphene coating 16, and diaphragm 13 is the polyolefin based membrane, and diaphragm 13 is located between positive plate 11 and the negative plate 12, and positive plate 11 and negative plate 12 are coiled into cylindrically after adding diaphragm 13 in the middle of, and positive plate 11 and negative plate 12's installation opposite direction.
The invention also discloses a preparation method of the explosion-proof low-internal-resistance lithium ion battery, which specifically comprises the following embodiments:
example 1
S1, firstly, coating a ceramic coating on one surface of a diaphragm 13, airing the ceramic coating to form a ceramic coating 15, then coating a graphene coating on the other surface of the diaphragm, and airing the graphene coating to form a graphene coating 16;
s2, preparing 45 parts of raw materials of electrolyte, 35 parts of organic solvent, 5 parts of lithium bis (trifluoromethylsulfonyl) imide and 6 parts of impedance film forming agent, wherein one of lithium hexafluorophosphate and lithium tetrafluoroborate is lithium hexafluorophosphate, the organic solvent is a combination of dimethyl carbonate and ethylene carbonate, the impedance film forming agent is alcohol ester twelve, putting the alcohol ester twelve into a reaction kettle, the temperature of the reaction kettle is 90 ℃, the stirring speed is 2200r/min, the stirring time is 6.5 minutes, and the stirring is uniform;
s3, after the first-stage stirring is completed, preparing 2 parts of fluoroethyl methyl carbonate, 4 parts of chlorinated polyethylene and 0.7 part of antioxidant, wherein the antioxidant is a combination of 2, 6-tertiary butyl-4-methylphenol and bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether, and putting the mixture into a reaction kettle for stirring, wherein the temperature of the reaction kettle is 93 ℃, the stirring speed is 2150r/min, and the stirring time is 4 minutes, so that the preparation of an electrolyte can be completed;
s4, assembling the processed positive plate 11, the processed negative plate 12 and the processed diaphragm 13, after the diaphragm 13 is placed between the positive plate 11 and the negative plate 12, winding the positive plate 11 and the negative plate 12, assembling the positive plate 11 and the negative plate 12 into an aluminum shell, and then injecting the electrolyte to complete the preparation of the lithium-ion battery.
Example 2
S1, firstly, coating a ceramic coating on one surface of a diaphragm 13, airing the ceramic coating to form a ceramic coating 15, then coating a graphene coating on the other surface of the diaphragm 13, and airing the graphene coating to form a graphene coating 16;
s2, preparing 40 parts of raw materials of electrolyte, 25 parts of organic solvent, 3 parts of lithium bis (trifluoromethylsulfonyl) imide and 4 parts of impedance film forming agent, wherein one of lithium hexafluorophosphate and lithium tetrafluoroborate is lithium hexafluorophosphate, the organic solvent is a combination of dimethyl carbonate, ethylene carbonate and methyl propyl carbonate, the impedance film forming agent is ethylene glycol, the temperature of the reaction kettle is 80 ℃, the stirring speed is 2100r/min, the stirring time is 5 minutes, and the reaction kettle is uniformly stirred;
s3, after the first-stage stirring is completed, preparing 1 part of fluoroethyl methyl carbonate, 2 parts of chlorinated polyethylene and 0.5 part of antioxidant, wherein the antioxidant is 2, 6-tertiary butyl-4-methylphenol, adding the mixture into a reaction kettle, stirring, wherein the temperature of the reaction kettle is 90 ℃, the stirring speed is 2000r/min, and the stirring time is 3 minutes, so that the preparation of an electrolyte can be completed;
s4, assembling the processed positive plate 11, the processed negative plate 12 and the processed diaphragm 13, after the diaphragm is placed between the positive plate 11 and the negative plate 12, winding the positive plate 11 and the negative plate 12, assembling the positive plate 11 and the negative plate 12 into an aluminum shell, and then injecting the electrolyte to complete the preparation of the lithium-ion battery.
Example 3
S1, firstly, coating a ceramic coating on one surface of a diaphragm 13, airing the ceramic coating to form a ceramic coating 15, then coating a graphene coating on the other surface of the diaphragm 13, and airing the graphene coating to form a graphene coating 16;
s2, preparing 50 parts of lithium hexafluorophosphate and lithium tetrafluoroborate serving as raw materials of electrolyte, 45 parts of organic solvent, 7 parts of lithium bis (trifluoromethylsulfonyl) imide and 8 parts of impedance film forming agent, wherein one of lithium hexafluorophosphate and lithium tetrafluoroborate is lithium tetrafluoroborate, the organic solvent is dimethyl carbonate, the impedance film forming agent is ethylene glycol, putting the materials into a reaction kettle, wherein the temperature of the reaction kettle is 95 ℃, the stirring speed is 2300r/min, the stirring time is 8 minutes, and uniformly stirring the materials;
s3, after the first-stage stirring is finished, 3 parts of fluoroethyl methyl carbonate, 6 parts of chlorinated polyethylene and 0.9 part of antioxidant are prepared, wherein the antioxidant is a combination of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether and pentaerythritol tetrakis [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionate ], and the mixture is put into a reaction kettle for stirring, the temperature of the reaction kettle is 96 ℃, the stirring speed is 2300r/min, and the stirring time is 5 minutes, so that the preparation of an electrolyte can be finished;
s4, assembling the processed positive plate 11, the processed negative plate 12 and the processed diaphragm 13, after the diaphragm is placed between the positive plate 11 and the negative plate 12, winding the positive plate 11 and the negative plate 12, assembling the positive plate 11 and the negative plate 12 into an aluminum shell, and then injecting the electrolyte to complete the preparation of the lithium-ion battery.
Comparative case
30 workers are selected randomly from a certain lithium ion battery factory to test lithium ion batteries, wherein 10 workers are selected to test the lithium ion batteries manufactured by the manufacturing method of the embodiment 1 of the invention, 10 workers are selected randomly to test the lithium ion batteries manufactured by the manufacturing method of the embodiment 2 of the invention, the rest 10 workers test the lithium ion batteries manufactured by the manufacturing method of the embodiment 3 of the invention, 10 lithium ion batteries manufactured by each group are taken, the internal resistance change rate and the explosion-proof performance of products are checked, and after the 30 workers are tested, the internal resistance change rate and the explosion-proof performance after the 30 workers are tested are recorded.
As shown in fig. 5, the lithium ion battery in the embodiment 1 has lower internal resistance, better conductivity and faster diffusion speed of lithium ions, and the battery cannot be exploded due to excessive gas generation in the high-temperature storage process, so that the potential safety hazard is reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides an explosion-proof low internal resistance lithium ion battery, includes battery body and electrolyte, its characterized in that: the battery body comprises a positive plate, a negative plate and a diaphragm, wherein a ceramic coating is coated on one side, close to the positive plate, of the diaphragm, a graphene coating is coated on one side, close to the negative plate, of the diaphragm, the diaphragm is a polyolefin-based film and is positioned between the positive plate and the negative plate, the diaphragm is filled in the middle of the positive plate and the negative plate and then wound to form a cylinder, and the installation directions of the positive plate and the negative plate are opposite;
the electrolyte comprises the following raw materials in parts by weight: 40-50 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 25-45 parts of an organic solvent, 3-7 parts of bis (trifluoromethylsulfonyl) imide lithium, 4-8 parts of an impedance film forming agent, 1-3 parts of fluoroethyl methyl carbonate, 2-6 parts of chlorinated polyethylene and 0.5-0.9 part of an antioxidant;
the organic solvent is one or more of dimethyl carbonate, ethylene carbonate and methyl propyl carbonate, the impedance film forming agent is one of alcohol ester twelve and ethylene glycol, and the antioxidant is one or more of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide and pentaerythritol tetrakis [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionate ].
2. The explosion-proof low internal resistance lithium ion battery according to claim 1, wherein: the raw material components of the electrolyte specifically comprise: 45 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 35 parts of an organic solvent, 5 parts of lithium bis (trifluoromethylsulfonyl) imide, 6 parts of an impedance film forming agent, 2 parts of fluoroethyl methyl carbonate, 4 parts of chlorinated polyethylene and 0.7 part of an antioxidant.
3. The explosion-proof low internal resistance lithium ion battery according to claim 1, wherein: the raw material components of the electrolyte specifically comprise: 40 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 25 parts of an organic solvent, 3 parts of lithium bis (trifluoromethylsulfonyl) imide, 4 parts of an impedance film forming agent, 1 part of fluoroethyl methyl carbonate, 2 parts of chlorinated polyethylene and 0.5 part of an antioxidant.
4. The explosion-proof low internal resistance lithium ion battery according to claim 1, wherein: the raw material components of the electrolyte specifically comprise: 50 parts of one of lithium hexafluorophosphate and lithium tetrafluoroborate, 45 parts of an organic solvent, 7 parts of lithium bis (trifluoromethylsulfonyl) imide, 8 parts of an impedance film forming agent, 3 parts of fluoroethyl methyl carbonate, 6 parts of chlorinated polyethylene and 0.9 part of an antioxidant.
5. A method for preparing an explosion-proof lithium ion battery with low internal resistance according to any one of claims 1 to 4, which is characterized in that: the method specifically comprises the following steps:
s1, firstly, coating a ceramic coating on one surface of a diaphragm, airing the ceramic coating to form a ceramic coating, then coating a graphene coating on the other surface of the diaphragm, and airing the graphene coating to form a graphene coating;
s2, preparing raw materials of lithium salt, an organic solvent, lithium bis (trifluoromethylsulfonyl) imide and an impedance film forming agent of an electrolyte according to a proportion, putting the raw materials into a reaction kettle, stirring at a temperature of 80-95 ℃ and a stirring speed of 2100-2300r/min for 5-8 minutes, and uniformly stirring the raw materials;
s3, after the first-stage stirring is completed, the components of fluoroethyl methyl carbonate, chlorinated polyethylene and an antioxidant are prepared according to the proportion, and are put into a reaction kettle for stirring, wherein the temperature of the reaction kettle is 90-96 ℃, the stirring speed is 2000-2300r/min, and the stirring time is 3-5 minutes, so that the preparation of the electrolyte is completed;
s4, assembling the processed positive plate, the processed negative plate, the processed diaphragm and the aluminum shell, winding the positive plate and the processed negative plate after the diaphragm is placed between the positive plate and the processed negative plate, assembling the positive plate and the processed negative plate into the aluminum shell, and then injecting the electrolyte to complete the preparation of the lithium-ion battery.
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| CN111463485A (en) * | 2020-04-09 | 2020-07-28 | 杉杉新材料（衢州）有限公司 | Lithium ion battery electrolyte and lithium ion battery |
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