CN109994736A - A kind of high specific energy lithium battery and preparation method thereof - Google Patents
A kind of high specific energy lithium battery and preparation method thereof Download PDFInfo
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- CN109994736A CN109994736A CN201910283432.0A CN201910283432A CN109994736A CN 109994736 A CN109994736 A CN 109994736A CN 201910283432 A CN201910283432 A CN 201910283432A CN 109994736 A CN109994736 A CN 109994736A
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
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Abstract
A kind of high specific energy lithium battery, including negative electrode tab, positive plate, diaphragm, electrolyte and shell；The negative electrode tab, positive plate and diaphragm are built in shell, and electrolyte, which gathers, to be riddled in shell；Rolled or laminated is presented in negative electrode tab, positive plate and diaphragm, the negative electrode tab includes collector and coating negative electrode slurry on a current collector, and the negative electrode slurry is that negative electrode active material 90~98%, conductive agent 0.5~4%, binder 1~4%, solvent 0.5~2% form by following weight fraction.When to lithium battery fluid injection, the organic carbonate ester solvent in electrolyte is rapidly swollen acrylonitrile multiple copolymer, improves fluid injection efficiency；At this time although battery has certain bulging, but after charging work, the swelling of acrylonitrile multiple copolymer disappears, and bulging phenomenon is not present in battery, guarantees the effect used and safety.
Description
Technical field
The present invention relates to field of lithium, and in particular to a kind of high specific energy lithium battery and preparation method thereof.
Background technique
With science and technology and rapid economic development, the function of market electronic product is stronger and stronger, and outer dimension requirement
It is smaller and smaller, weight demands are more and more lighter, lithium battery, which generally comprises, battery case and is contained in the intracorporal battery core of battery case and electrolysis
Liquid, battery core include anode, cathode and the diaphragm between anode and cathode.The preparation of battery, with the positive electrode, the negative electrode and the separator system
At battery core, then battery core is placed in battery case, then nonaqueous electrolytic solution is injected in battery case, the nonaqueous electrolytic solution one
As contain organic solvent and lithium salts.
In the prior art, there are bottlenecks below for lithium battery: on the one hand, fluid injection low efficiency, because lithium ion battery constantly to
Reduce volume and the intensive direction of high-energy is developed, it is very limited for accommodating the space of electrolyte in battery, it is therefore necessary to
Limited space absorbs the electrolyte more than possibility as much as possible, provides battery needed electrolyte, and the fluid injection of current electrolysis liquid
Efficiency is insufficient for；On the other hand, in injection process, certain expansion will occur battery for lithium battery, not only influence lithium
The energy consumption efficiency of battery, there is also security risks.
Summary of the invention
The problem of being proposed according to background technique, the present invention provide a kind of high specific energy lithium battery and preparation method thereof to solve,
Next the present invention is done and is further illustrated.
The technical problem to be solved by the present invention is in the prior art, the fluid injection low efficiency of the electrolyte of lithium battery, also,
Expansion is easy to happen in injection process；Technical solution is as follows:
A kind of high specific energy lithium battery, including negative electrode tab, positive plate, diaphragm, electrolyte and shell；The negative electrode tab, anode
Piece and diaphragm are built in shell, and electrolyte injects in shell；Rolled or laminated is presented in negative electrode tab, positive plate and diaphragm,
The negative electrode tab includes the negative electrode slurry of collector and coating on a current collector, and the negative electrode slurry is negative by following weight fraction
Pole active matter 90~98%, conductive agent 0.5~4%, acrylonitrile multiple copolymer dispersion liquid 1~4%, special solvent 0.1~2%
Composition.
Further, the special solvent is organic carbonate ester solvent.
Further, the organic carbonate ester solvent includes but is not limited to ethylene carbonate, propene carbonate, carbonic acid diformazan
Ester；The swellability of the dispersion liquid of acrylonitrile multiple copolymer can be greatly improved, and then improves fluid injection efficiency.
The present invention also provides a kind of production methods of high specific energy lithium battery, comprising:
Prepare negative electrode slurry, by weight fraction be negative electrode active material 90~98%, conductive agent 0.5~4%, binder 1~
4%, 0.1~2% ingredient of special solvent is mixed with deionized water, and negative electrode slurry is prepared；
Baking removes the deionized water in pole piece；
Baking removes the deionized water in pole piece；
Laser is cut, and tab is cut off；
Negative electrode slurry is coated on negative electrode tab collector by coating, and negative electrode tab is made；
Negative electrode tab, positive plate and diaphragm are wound, negative electrode tab, positive plate and diaphragm that rolled is presented are obtained；
Assembling, the negative electrode tab of rolled, positive plate and diaphragm are put into shell；
Fluid injection injects the electrolyte into inside battery.
Further, the coating operation, including two steps: the first step, along collector, some direction is coated, and is covered completely
Lid collector, then opposite direction coats collector；Second step is carried out along the direction vertical with first step coating direction
Same reciprocal coating twice；After guaranteeing coating, negative electrode tab of the surface coated with the high slurry of homogeneous flatness is obtained.
The utility model has the advantages that compared with prior art, the dispersion of acrylonitrile multiple copolymer is added in the present invention in negative electrode slurry
It joined a small amount of organic carbonate ester solvent while liquid, be conducive to that acrylonitrile multiple copolymer is made to have certain swelling tendencies,
Organic carbonate ester solvent when fluid injection in electrolyte can make rapidly acrylonitrile multiple copolymer be swollen, and improve fluid injection efficiency,
At this time although battery has certain bulging, but the swelling of acrylonitrile multiple copolymer disappears after charging, and bulging is not present in battery.
Detailed description of the invention
Fig. 1: the flow chart of the method for the present invention.
Specific embodiment
Next a specific embodiment of the invention is set forth.
A kind of high specific energy lithium battery, including negative electrode tab, positive plate, diaphragm, electrolyte and shell；The negative electrode tab, anode
Piece and diaphragm are built in shell, and rolled is presented in negative electrode tab, positive plate and diaphragm, to expand pole in limited space
Piece, positive plate and diaphragm are included in volume, maximize negative electrode tab, the contact area of positive plate and diaphragm and electrolyte, electrolyte
It gathers and riddles in shell, inventive point of the invention is in the preparation for being negative electrode tab and the preparation of high specific energy lithium battery.
The negative electrode tab includes the negative electrode slurry of collector and coating on a current collector, and weight fraction is negative electrode active material 90
~98%, conductive agent 0.5~4%, binder 1~4%, special solvent 0.1~2%.
More preferably, the negative electrode slurry is formed by following weight fraction: negative electrode active material 97%, conductive agent 0.5%, special
Binder 2.0%, special solvent 0.5%.
The special binders are the dispersion liquid of acrylonitrile multiple copolymer, because the dispersion liquid of acrylonitrile multiple copolymer exists
There is certain swellability in organic carbonate ester solvent, acrylonitrile multi-component copolymer is added in the present invention in the negative electrode slurry of the prior art
Object dispersion liquid replaces common binder, and there are certain swollen characteristics of appearance when achieving the effect that lithium battery electric discharge.
Further, it joined a small amount of spy while the dispersion liquid of acrylonitrile multiple copolymer is added in negative electrode slurry
Different solvent further promotes the swelling tendencies of acrylonitrile multiple copolymer；More preferably, the special solvent is that organic carbonate is molten
Agent.
Preferably, acrylonitrile multiple copolymer includes LA132/LA133, LA136D.
Preferably, organic carbonate ester solvent includes but is not limited to ethylene carbonate, propene carbonate, dimethyl carbonate.
Organic carbonate ester solvent when negative electrode tab of the invention is assembled into shell after being made, when fluid injection, in electrolyte
Acrylonitrile multiple copolymer can be made to be swollen rapidly, improve fluid injection efficiency, at this time although battery has certain bulging, but fills
The swelling of acrylonitrile multiple copolymer will disappear after electricity, and bulging is not present in battery.
In some other embodiment, the laminated stacked is presented in negative electrode tab, positive plate and diaphragm, plays same skill
Art effect.
A kind of production method of high specific energy lithium battery, comprising:
Negative electrode slurry is prepared, is negative electrode active material 90~98%, conductive agent 1~4%, special binders 1 by weight fraction
~4%, 0.1~2% ingredient of special solvent is mixed with deionized water, and negative electrode slurry is prepared；
Negative electrode slurry is coated on negative electrode tab collector by coating, and negative electrode tab is made；
Winding, winding negative electrode tab, positive plate and diaphragm obtain negative electrode tab, positive plate and diaphragm that rolled is presented；
Assembling, the negative electrode tab of rolled, positive plate and diaphragm are put into shell；
Fluid injection injects the electrolyte into shell until full of shell.
Wherein, for coating operation, the present embodiment dips the inswept collector of negative electrode slurry using the soft hairbrush of fine and closely woven matter, has
Body includes two steps: the first step, along collector, some direction is coated, and collector is completely covered, then opposite direction is to collector
It is coated, the coating uniformity can be improved；Second step carries out same reciprocal along the direction vertical with first step coating direction
It coats twice.After guaranteeing coating, negative electrode tab of the surface coated with the high slurry of homogeneous flatness is obtained
Through the invention, when to lithium battery fluid injection, the organic carbonate ester solvent in electrolyte makes rapidly acrylonitrile polynary
Copolymer swelling, improves fluid injection efficiency；At this time although battery has certain bulging, but in charge and discharge process, acrylonitrile is polynary
The swelling of copolymer disappears, and bulging phenomenon is not present in battery, guarantees the effect used and safety.
It is below the present embodiment compared with comparing embodiment, each ingredient of the negative electrode slurry of the present embodiment is further described
Use scope and optimal weight item ratio.
In practice, the index for judging lithium battery fluid injection efficiency is mainly the fluid injection time, and the present invention adds in existing ingredient
The special solvent for adding acrylonitrile multiple copolymer to be used as binder and organic carbonate ester solvent, passes through acrylonitrile multi-component copolymer
Object reaches the technological means for solving technical problem as binder with the mating reaction of special solvent organic carbonate ester solvent.
By practical experience it is found that when the ratio of negative electrode active material reaches 97%, the comprehensive performance of lithium battery be it is best, therefore, this implementation
Example is using existing best fluid injection condition as comparative example.
On the other hand, the present invention is by the dispersion liquid of addition acrylonitrile multiple copolymer as binder and organic carbonate
Solvent improves fluid injection efficiency, improves the swellability of acrylonitrile multiple copolymer by organic carbonate ester solvent and then improves fluid injection effect
Rate, but inevasible expand of lithium battery causes thickness to change, but during the charging process, acrylonitrile multiple copolymer
Swelling can be eliminated, therefore, by doing charge-discharge test to lithium battery after the completion of fluid injection, after detecting charging and discharging lithium battery
Expansion status is also the emphasis that the present invention is paid close attention to, and the judge index of the expansion status after charging and discharging lithium battery is expansion rate, described
The calculating formula of expansion rate Δ h are as follows:Wherein, h0For the design thickness of lithium battery before charge and discharge, h1It is filled for lithium battery
The actual (real) thickness of lithium battery after electric discharge.
The present invention is by measuring i.e. 20 DEG C at normal temperature, when the design reservoir quantity of electrolyte is 20g, comparative example and each implementation
The fluid injection time t of example, the expansion rate Δ h after charge and discharge, because design reservoir quantity and temperature are certain, therefore comparative example and all implementations
Lithium battery design thickness before example charge and discharge is all definite value h0。
In the prior art, binder used is generally CMC-SBR, and the present invention also uses CMC-SBR as common bonding
Agent.
In the step of comparative example 1, this comparative example prepares negative electrode slurry, the weight fraction of negative electrode slurry ingredient is respectively as follows: negative
Pole active matter 97%, conductive agent 0.5%, CMC-SBR2.0%, residue 0.5% are deionized water.
In the step of comparative example 2, this comparative example prepares negative electrode slurry, the weight fraction of negative electrode slurry ingredient is respectively as follows: negative
Pole active matter 97%, conductive agent 0.5%, CMC-SBR2.0%, ethylene carbonate ester solvent 0.5%.
In the step of comparative example 3, this comparative example prepares negative electrode slurry, the weight fraction of negative electrode slurry ingredient is respectively as follows: negative
Pole active matter 97%, conductive agent 0.5%, CMC-SBR2.5%.
In the step of embodiment 1, this comparative example prepares negative electrode slurry, the weight fraction of negative electrode slurry ingredient is respectively as follows: negative
Pole active matter 97%, conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 2.0%, ethylene carbonate ester solvent 0.5%.
Table 1 is fluid injection time t and cell expansion rate Δ h measured by comparative example 1~3 and embodiment 1:
As can be seen from Table 1, comparative example 1 uses common bond CMC+SBR, and the fluid injection time is long, lithium electricity after charge and discharge
The expansion rate in pond is high；Comparative example 2 uses common bond CMC+SBR, even if ethylene carbonate ester solvent is added, the fluid injection time is still
It is long, expansion rate or height；When comparative example 3 uses acrylonitrile multiple copolymer dispersion liquid as binder, the fluid injection time shortens, swollen
Swollen rate also reduces；Embodiment 1 uses acrylonitrile multiple copolymer dispersion liquid as binder, while ethylene carbonate ester solvent is added
When, the fluid injection time further shortens, and expansion rate also further decreases.
Hereinafter, to the acrylonitrile multiple copolymer dispersion liquid binder that is added of the present invention and ethylene carbonate ester solvent
Weight range and optimal proportion are illustrated.
Embodiment 2, in the present embodiment, in the step of preparing negative electrode slurry, the weight fraction of negative electrode slurry ingredient is respectively as follows:
Negative electrode active material 95%, conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 0.5%, remaining be deionized water.
Embodiment 3, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 1.0%.
Embodiment 4, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 1.3%.
Embodiment 5, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 1.5%.
Embodiment 6, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 2.0%.
Embodiment 7, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 2.5%.
Embodiment 8, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is 3.0%.
Embodiment 9, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, the propylene
The weight fraction of nitrile multiple copolymer dispersion liquid is acrylonitrile multiple copolymer dispersion liquid 3.5%.
Embodiment 10, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, described third
The weight fraction of alkene nitrile multiple copolymer dispersion liquid is 4.0%.
Embodiment 11, in the present embodiment, the difference with embodiment 2 was only that in the step of preparing negative electrode slurry, described third
The weight fraction of alkene nitrile multiple copolymer dispersion liquid is 4.5%.
The fluid injection time t that surveys and cell expansion rate Δ h of the table 2 by embodiment 2~11；
As shown in Table 2, common bond of the acrylonitrile multiple copolymer dispersion liquid as binder compared with the prior art
With better effect, the swellability having improves fluid injection efficiency, but acrylonitrile multiple copolymer dispersion liquid is being lower than
When 1.0%, there are few substantial effects due to concentration is too low, on the other hand, when acrylonitrile multiple copolymer dispersion liquid concentration gradually rises
Gao Shi, fluid injection efficiency is also promoted therewith, but edge effect gradually reduces, when being higher than 4.0%, the dispersion of acrylonitrile multiple copolymer
The excessive concentration of liquid is not in the specific effect for further promoting fluid injection efficiency, instead because there are certain resistances for the injection to electrolyte
Power, therefore, it is suitable that the accounting of acrylonitrile multiple copolymer dispersion liquid, which is 1.0%~4.0%, and is most economical with 2.0%
With the concentration value of benefit.
Embodiment 12, in the present embodiment, in the step of preparing negative electrode slurry, the weight fraction of negative electrode slurry ingredient is distinguished
Are as follows: negative electrode active material 95%, conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 2.0%, remaining be deionized water.
Embodiment 13, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 0.1%.
Embodiment 14, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 0.5%.
Embodiment 15, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 1.0%.
Embodiment 16, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 1.5%.
Embodiment 17, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 2.0%.
Embodiment 18, in the present embodiment, the difference with embodiment 11 was only that in the step of preparing negative electrode slurry, further included
Ethylene carbonate ester solvent 2.5%.
The fluid injection time t that surveys and cell expansion rate Δ h of the table 3 by embodiment 12~18:
As shown in Table 2, after acrylonitrile multiple copolymer dispersion liquid being added, acrylonitrile multiple copolymer dispersion liquid is preferably molten
Swollen property improves fluid injection efficiency, meanwhile, the ethylene carbonate ester solvent of addition further improves the dispersion of acrylonitrile multiple copolymer
The swellability of liquid, so that fluid injection efficiency greatly improves.With the promotion of ethylene carbonate weight of solvent score, the fluid injection of lithium battery
Efficiency also increases accordingly, also, promotes effect clearly in early period, just can reach optimum efficiency when 0.2%, and later not
There is promotion effect again；And after 2.0%, ethylene carbonate ester solvent inhibits the charge and discharge of lithium battery because of its insulating properties instead.
Therefore, it is suitable that ethylene carbonate ester solvent accounting, which is 0.1%~2.0%, is 1.3% in acrylonitrile multiple copolymer dispersion liquid
When, ethylene carbonate ester solvent is 0.2%.
In practice, when the ratio of negative electrode active material reaches 97%, the comprehensive performance of lithium battery is best, therefore bears in practice
The weight of pole active matter is designed to 97%, and the acrylonitrile multiple copolymer dispersion liquid obtained for embodiment before is 2.0%,
Ethylene carbonate ester solvent 0.5%, the ratio of negative electrode active material are 95%, remaining is deionized water, next by negative electrode active
The ratio of object is stepped up to 97%, and measures fluid injection time and cell expansion rate.
Embodiment 19, in the present embodiment, in the step of preparing negative electrode slurry, the weight fraction of negative electrode slurry ingredient is distinguished
Are as follows: negative electrode active material 95%, conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 1.3%, ethylene carbonate ester solvent
0.2%, remaining is deionized water.
Embodiment 20, in the present embodiment, the difference with embodiment 18 is only that negative electrode active material 95.5%.
Embodiment 21, in the present embodiment, the difference with embodiment 18 is only that negative electrode active material 96.0%.
Embodiment 22, in the present embodiment, the difference with embodiment 18 is only that negative electrode active material 96.5%.
Embodiment 23, in the present embodiment, the difference with embodiment 18 is only that negative electrode active material 97.0%.
Table 4, the fluid injection time t and cell expansion rate Δ h surveyed by embodiment 19~23:
As shown in Table 4, in conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 1.3%, ethylene carbonate ester solvent
Under 0.2% proportion, the weight accounting of negative electrode active material from 95% promoted to 97% when, the fluid injection time is also promoted therewith, but is passed
The amplitude of increasing is unobvious, is directly set as acrylonitrile multiple copolymer dispersion liquid 1.3%, ethylene carbonate ester solvent 0.2% most
Good proportion, the ratio of negative electrode active material reaches 97% at this time, is the best comprehensive performance of lithium battery.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of high specific energy lithium battery, including negative electrode tab, positive plate, diaphragm, electrolyte and shell；The negative electrode tab, positive plate
It is built in shell with diaphragm, electrolyte injects in shell；It is characterized by: rolled is presented in negative electrode tab, positive plate and diaphragm
Or laminated, the negative electrode tab include the negative electrode slurry of collector and coating on a current collector, the negative electrode slurry is by following heavy
Amount score is negative electrode active material 90~98%, conductive agent 0.5~4%, binder 1~4%, special solvent 0.1~2% form,
The binder is acrylonitrile multiple copolymer dispersion liquid.
2. a kind of high specific energy lithium battery according to claim 1, it is characterised in that: the special solvent is organic carbonate
Solvent.
3. a kind of high specific energy lithium battery according to claim 1, it is characterised in that: the acrylonitrile multiple copolymer includes
LA132/LA133 and LA136D.
4. a kind of high specific energy lithium battery according to claim 2, it is characterised in that: the organic carbonate ester solvent includes carbon
Vinyl acetate, propene carbonate or dimethyl carbonate.
5. a kind of production method of high specific energy lithium battery, comprising:
Prepare negative electrode slurry, by weight fraction be negative electrode active material 90~98%, conductive agent 0.5~4%, binder 1~4%,
0.1~2% ingredient of special solvent is mixed with deionized water, and negative electrode slurry is prepared；
Negative electrode slurry is coated on negative electrode tab collector by coating, and negative electrode tab is made；
Baking removes the deionized water in negative electrode tab；
Laser is cut, and tab is cut off；
Winding, winding negative electrode tab, positive plate and diaphragm obtain negative electrode tab, positive plate and diaphragm that rolled is presented；
Assembling, the negative electrode tab of rolled, positive plate and diaphragm are put into shell；
Baking: the moisture of inside battery is dried；
Fluid injection injects the electrolyte into inside battery.
6. according to right want 1 described in a kind of high specific energy lithium battery, it is characterised in that: the electrolyte is by solute lithium salts and addition
Agent is dissolved in machine carbonate solvent and is made.
7. a kind of high specific energy lithium battery preparation method according to claim 1, it is characterised in that: the negative electrode slurry press with
Lower weight fraction composition: negative electrode active material 97%, conductive agent 0.5%, acrylonitrile multiple copolymer dispersion liquid 1.3%, special molten
Agent 0.2%.
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| CN113299920A (en) * | 2021-05-24 | 2021-08-24 | 合肥国轩高科动力能源有限公司 | Lithium battery roll core |
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| CN108598404A (en) * | 2018-04-16 | 2018-09-28 | 清华大学 | A kind of lithium ion battery, cathode, negative conductive slurry and preparation method |
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| CN113299920A (en) * | 2021-05-24 | 2021-08-24 | 合肥国轩高科动力能源有限公司 | Lithium battery roll core |
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Application publication date: 20190709 |