CN106356526A - Lithium ion battery capable of being charged quickly and preparation method of lithium ion battery - Google Patents
Lithium ion battery capable of being charged quickly and preparation method of lithium ion battery Download PDFInfo
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
- H01M10/0568—Liquid materials characterised by the solutes
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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 a lithium ion battery capable of being charged quickly and a preparation method of the lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm plugged between the positive electrode and the negative electrode, and organic electrolyte, wherein the particle size D50 of an active material of the positive electrode is 3.1 to 8.1 microns, and the particle size D50 of an active material of the negative electrode is 11.5 to 17.5 microns; the positive electrode surface density of the positive electrode is 357 to 373 g/m<2>, and the negative electrode surface density of the negative electrode is 179 to 187 g/m<2>. The lithium ion battery disclosed by the invention is high in high-current quick charging performance and can neither cause lithium separation from the battery nor affect the cyclic life of the battery.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly, to a kind of lithium ion battery of quickly-chargeable
And preparation method thereof.
Background technology
Lithium ion battery be widely used in mobile computer, mobile phone, digital camera, video camera,
Pda, bluetooth earphone and wireless 3c articles for use, however it is necessary that high-power electric motor car is not yet become with hand-held tool application
Ripe.Electric motor car (electric vehicle, ev) is known as one of this century most important industrial products, and lithium
Ion battery will be the primary selection of electric motor car energy, for the application of this respect, the demand of quick charge
It is the problem of overriding challenge and urgent need to resolve.
At present, the problem that lithium ion battery exists includes: charging current is less than normal, the time is longer；Can not hold
By high current quick charge；During high current quick charge, substantial amounts of lithium ion be collected at negative terminal surface it is impossible to
Enough effectively diffusions are come, and lead to analyse lithium, shorten battery life.
For improving the high current rapid charge characteristic of lithium ion battery, Chinese invention patent application cn
102347472a discloses a kind quickly-chargeable lithium ion battery negative material, and this negative material includes carbon
Core and modification layer, wherein modification layer is the surface being formed at carbon core by sol-gel process, and modification layer is
With li4m5o12-moxThe compound lithium metal oxide representing, m represents titanium or manganese, and 1≤x≤2.Because of lithium
Metal oxide does not have solid electrolyte interface film in charge and discharge process and generates, and has zero strain and three
Degree space crystalline texture, favourable reduce the common sei film in carbon materials surface, make lithium ion can rapidly via
Compound lithium metal oxide enters material with carbon element, reaches quick charge characteristic.However, program dependence is new
Compound lithium metal oxide, and the improvement to high current rapid charge characteristic is preferable not enough.
Chinese invention patent application cn 101262078a disclose a kind of lithium ion battery of quickly-chargeable and
Its preparation method, the program is using submicron order lithium titanate as the active material of negative electrode although can be one
Determine to improve rapid charge characteristic in degree, but cycle life can be affected, the later capacity of 300 circulations
Conservation rate can be only sustained at 80% level.
Content of the invention
The present invention provides a kind of lithium ion battery of quickly-chargeable and preparation method thereof, and this lithium ion battery has
There is good high current rapid charge characteristic, and also do not result in battery analysis lithium, do not affect the circulation of battery
Life-span.
According to the first aspect of the invention, the present invention provides a kind of lithium ion battery of quickly-chargeable, including
Positive electrode, negative electrode and the barrier film being inserted between above-mentioned positive electrode and negative electrode and organic electrolyte, above-mentioned
The particle diameter d50 of the active material of positive electrode is 3.1～8.1 microns, the particle diameter of the active material of above-mentioned negative electrode
D50 is 11.5～17.5 microns, and the positive pole surface density of above-mentioned positive electrode is 357～373g/m2, above-mentioned negative electrode
Negative pole surface density be 179～187g/m2.
As the further improved scheme of the present invention, the lithium salts in above-mentioned organic electrolyte is lipf6, its concentration
For 1.3～1.7mol/l.
As the further improved scheme of the present invention, above-mentioned positive electrode and negative electrode are all using CNT as leading
Electric agent.
As the further improved scheme of the present invention, the particle diameter d50 of the active material of above-mentioned positive electrode is 5.6
Micron, the particle diameter d50 of the active material of above-mentioned negative electrode is 14.5 microns, and the positive pole-face of above-mentioned positive electrode is close
Spend for 365g/m2, the negative pole surface density of above-mentioned negative electrode is 183g/m2；Lithium salts in above-mentioned organic electrolyte
For lipf6, its concentration is 1.5mol/l；Above-mentioned positive electrode and negative electrode are all using CNT as conductive agent.
As the further improved scheme of the present invention, the active material of above-mentioned positive electrode is licoo2, above-mentioned negative
The active material of electrode is graphite.
As the further improved scheme of the present invention, the organic solvent in above-mentioned organic electrolyte contains ethylene
Alkene ester, dimethyl carbonate and methyl ethyl carbonate.
As the further improved scheme of the present invention, above-mentioned lithium ion battery charges to full of needs under 2.0c
Time be less than 2 hours, preferably 1.5 hours.
According to the second aspect of the invention, the present invention provides a kind of lithium ion battery preparing quickly-chargeable
Method, comprising: the active material of the positive electrode being 3.1～8.1 microns with particle diameter d50 is according to the positive pole of positive electrode
Surface density is 357～373g/m2Form positive electrode；The work of the negative electrode being 11.5～17.5 microns with particle diameter d50
Property material according to negative electrode negative pole surface density be 179～187g/m2Form negative electrode；By barrier film be inserted in above-mentioned just
Form battery core between electrode and negative electrode, inject organic electrolyte, and be packaged into above-mentioned lithium ion battery.
As the further improved scheme of the present invention, the lithium salts in above-mentioned organic electrolyte is lipf6, its concentration
For 1.3～1.7mol/l.
As the further improved scheme of the present invention, above-mentioned positive electrode and negative electrode are all using CNT as leading
Electric agent.
The invention has the beneficial effects as follows: the activity of the positive electrode that the present invention is 3.1～8.1 microns using particle diameter d50
Material is less than the active material particle diameter that usual d50 is 12.1 microns；And using particle diameter d50 it is
The active material of 11.5～17.5 microns of negative electrode, the active material grain being 20.3 microns than usual d50
Footpath is less；Simultaneously in the present invention positive electrode positive pole surface density 357～373g/m2Negative pole surface density with negative electrode
179～187g/m2Also all less than surface density of the prior art.It is achieved thereby that good high current is quickly filled
Electrical property, and also do not result in battery analysis lithium, do not affect the cycle life of battery.Additionally, with
The lipf of 1.3～1.7mol/l6As lithium salts, and using CNT as conductive agent, can improve big further
Electric current rapid charge characteristic, the final charging interval shortens 50% about.
Brief description
Fig. 1 is positive electrode active materials (left figure) and general material (right figure) in one embodiment of the present of invention
Sem particle size figure；
Fig. 2 is negative active core-shell material (left figure) and general material (right figure) in one embodiment of the present of invention
Sem particle size figure；
Fig. 3 is the interlamellar spacing schematic diagram in one embodiment of the present of invention；
Fig. 4 is for the interlamellar spacing (after improvement) in one embodiment of the present of invention compared to existing technology (before improvement)
Interlamellar spacing variation diagram；
Fig. 5 is netted CNT cnt (left figure) and fine granularity in one embodiment of the present of invention
Carbon black sp (right figure) sem figure；
Fig. 6 is the charging voltage of lithium ion battery and time before and after the improvement in one embodiment of the present of invention
Graph of a relation；
Fig. 7 is the cycle life comparison diagram of the lithium ion battery before and after the improvement in one embodiment of the present of invention.
Specific embodiment
Combine accompanying drawing below by specific embodiment the present invention is described in further detail.
The particle diameter d50 of the active material of the positive electrode of existing lithium ion battery is usually 12.1 microns of left sides at present
The right side, the particle diameter d50 of the active material of negative electrode is usually 20.3 microns；The positive pole surface density of positive electrode
It is usually 414g/m2, the negative pole surface density of negative electrode is usually 207g/m2；Lithium salts in organic electrolyte
lipf6Concentration be usually 1.0mol/l；The conductive agent of positive electrode and negative electrode is usually sp conductive agent.Existing
Some lithium ion batteries generally require and charge under 0.5c, full of generally requiring about 3 hours.
The key point of the present invention is, the grain to the positive electrode in lithium ion battery and the active material of negative electrode
Footpath is adjusted, and aligns pole-face density and negative pole surface density is adjusted；And further lithium salt is entered
Row adjustment, is adjusted to conductive agent, realizes good high current rapid charge characteristic.
Specifically, in a technical scheme of the present invention, the particle diameter d50 of the active material of positive electrode is
3.1～8.1 microns, the particle diameter d50 of the active material of negative electrode is 11.5～17.5 microns；The positive pole of positive electrode
Surface density is 357～373g/m2, the negative pole surface density of negative electrode is 179～187g/m2；In organic electrolyte
Lithium salts is lipf6, its concentration is 1.3～1.7mol/l；Positive electrode and negative electrode are all using CNT as conduction
Agent.Using technical scheme, charge under 2.0c full of the time needing less than 2 hours, one
As can be full of within 1.5 hours.Therefore, compare existing lithium ion battery, the filling of the lithium ion battery of the present invention
The electric time shortens 50% about.
Active positive electrode material in the present invention compares general positive electrode and negative pole with negative electrode active material
The particle diameter of material is all less, can effectively shorten the path of lithium ion mobility, reduces lithium ion and is moving
The resistance overcoming is needed in shifting.
It is all less that positive pole surface density in the present invention compares general surface density with negative pole surface density, reduces face close
Degree can reduce the thickness of pole piece, and corresponding stratigraphic separation also reduces, thus shortening the path of lithium ion mobility,
The resistance overcoming required for the short lithium ion mobility in path also can reduce.
The concentration of the lithium ion in organic electrolyte in the present invention significantly improves compared to existing technology, electricity in solution
Separate out the li coming+Will be more, the electrical conductivity of electrolyte increases, li+Migration rate strengthens.
Adopt the CNT (cnt) of novel netted as conductive electrode in the present invention, its electrical conductivity is tradition
100 times of sp conducting resinl, cnt is network structure, and sp is the carbon black of fine granularity, and cnt is in all directions
On electric conductivity good compared with sp, be conducive to the migration of electronics in pole piece, increase the speed of electronics movement.
Inventor has confirmed, is licoo in the active material of positive electrode2, negative electrode active material be stone
In the case of ink, it is capable of good high current rapid charge characteristic.
In technical scheme, the organic solvent in organic electrolyte preferably comprise ethylene carbonate (ec),
Dimethyl carbonate (dmc) and methyl ethyl carbonate (emc).Wherein, dimethyl carbonate (dmc) and carbon
Sour methyl ethyl ester (emc), as the additive of chain, can reduce the viscosity of electrolyte, the viscosity of electrolyte
Reduce, li+It is easier in the solution to flow, be also easier to immerse in pole piece and barrier film, be conducive to li+Shifting
Dynamic, accelerate li+Migration.
Describe the present invention by the following examples in detail.These embodiments are only exemplary, and it is right not constitute
The restriction of the scope of the present invention.
Embodiment 1
The particle diameter d50=5.6 micron of the positive electrode active materials that the present embodiment is selected, the particle diameter of negative active core-shell material
D50=14.5 micron, more general positive electrode active materials particle diameter d50=12.1 micron, negative active core-shell material particle diameter
D50=20.3 micron (referring to table 1, Fig. 1 and Fig. 2) is all little, can effectively shorten the road of lithium ion mobility
Electrical path length, reduces the resistance that lithium ion needs to overcome in migration.
The particle diameter distribution of table 1 positive and negative pole material
The present embodiment reduces the surface density of coating, by positive pole surface density by 414g/m2It is reduced to 365g/m2, fall
Low by 11.8%, reduce the thickness that positive pole surface density can reduce positive plate, corresponding stratigraphic separation is also by 269 microns
It is reduced to 243 microns, the range of decrease 9.6% (referring to Fig. 3 and Fig. 4), that is, shorten the path of lithium ion mobility,
The resistance overcoming required for the short lithium ion mobility in path also can reduce.Similarly, by negative pole surface density by
207g/m2It is reduced to 183g/m2.
The present embodiment is by lipf in electrolyte6Concentration 1.5mol/l is brought up to by 1.0mol/l, simultaneously in carbonic acid
More chains additive dimethyl carbonate (dmc) and methyl ethyl carbonate is added in vinyl acetate (ec)
(emc), the viscosity of electrolyte is reduced to 1.20mpa*s (referring to table 2) by 1.93mpa*s.Lithium ion
Concentration improve, the li ionizing out in solution+Will be more, the electrical conductivity of electrolyte increases, li+Migration
Speed strengthens；The viscosity of solution reduces, li+In the solution be easier flow, be also easier to immerse pole piece and
In barrier film, be both conducive to li+Movement, accelerate li+Migration.
The concentration of lithium ion and viscosity in table 2 electrolyte
The present embodiment adopts the CNT (cnt) of novel netted as conductive agent, and its electrical conductivity is tradition
100 times of sp conducting resinl, sp is the carbon black (referring to table 3 and Fig. 5) of fine granularity, and cnt is in all directions
On electric conductivity good compared with sp, be conducive to the migration of electronics in pole piece, increase the speed of electronics movement.
The electrical conductivity of table 3 cnt and sp
| Conducting resinl | Electrical conductivity (ohm.cm) | Pole piece resistance (ω) | |
| After improvement | cnt | 1.00e-02 | 13.61 |
| Before improvement | sp | 1.00e-04 | 63.78 |
Make the lithium ion battery of the present embodiment by following process:
According to following mass ratio formula mixing, it is each configured to positive and negative electrode slurry:
licoo2: cnt:pvdf (polyvinylidene fluoride): nmp (n- methyl pyrrolidone)
=100:0.7:1.5:40；
Graphite: cnt:cmc (sodium carboxymethylcellulose): sbr (butadiene-styrene rubber): water=100:0.6:1.4:1.5:
85.
According to positive pole surface density 365g/m2With negative pole surface density 183g/m2, it is respectively coated with aluminium foil and Copper Foil, and
Carry out roll-in, be fabricated to positive plate and negative plate.
Using pp/pe/pp (polypropylene, polyethylene/polypropylene) three-layer membrane of celgard company of the U.S., will
Positive plate and negative plate wind up, the unit of composition " 2 layers of barrier film+1 layer of negative pole of+1 layer of positive pole ", are fabricated to
Core, then toasted, to remove moisture.
The formula of electrolyte, with ethylene carbonate (ec) as primary solvent, lipf6For solute, it is equipped with carbonic acid
Dimethyl ester (dmc), methyl ethyl carbonate (emc) are additive, are ec according to volume ratio in glove box:
Dmc:emc=30:10:60 configures lipf6Concentration is the electrolyte of 1.5mol/l.
Core after baking is injected, in glove box, the electrolyte having configured, and seals, then through normal temperature one-tenthization
24～36h, so as to abundant infiltrate, finally adopts battery charging and discharging cabinet, with small current 0.2～0.3c chemical conversion, swashs
Battery core alive, forms stable sei film (solid electrolyte interface film), completes battery core and makes.
Lithium ion battery (comparative example) before improvement is different from the lithium ion battery after the improvement of the present embodiment
It is: before improvement, positive electrode active materials particle diameter d50=12.1 micron, negative active core-shell material particle diameter d50=20.3
Micron；Positive pole surface density 414g/m2, negative pole surface density 207g/m2；Lipf in electrolyte6Concentration 1.0mol/l；
Additive is traditional sp conducting resinl.Other side is identical with the lithium ion battery after the improvement of the present embodiment.
The charging interval of the present embodiment and the lithium ion battery of comparative example is tested.Lithium before improvement from
Sub- electrokinetic cell is merely able to accomplish that 0.5c charges, need about 3 hours fully charged, battery can be kept not analyse lithium,
Do not affect the ordinary life of battery.The lithium ion battery after improving of the present embodiment can accomplish that 2.0c fills
Electricity, it is only necessary to about 1.5 hours just can be full of, no analyses lithium phenomenon, and battery still can keep longer circulation
In the life-span (referring to Fig. 6 and Fig. 7), the charging interval shortens 50%.
Embodiment 2
The present embodiment is with the difference of embodiment 1, and positive electrode active materials d50 is 3.1 microns, Qi Tayu
Embodiment 1 is identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 3
The present embodiment is with the difference of embodiment 1, and positive electrode active materials d50 is 8.1 microns, Qi Tayu
Embodiment 1 is identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 4
The present embodiment is with the difference of embodiment 1, and negative active core-shell material d50 is 11.5 microns, Qi Tayu
Embodiment 1 is identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 5
The present embodiment is with the difference of embodiment 1, and negative active core-shell material d50 is 17.5 microns, Qi Tayu
Embodiment 1 is identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 6
The present embodiment is with the difference of embodiment 1, and positive pole surface density is 357g/m2, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 7
The present embodiment is with the difference of embodiment 1, and positive pole surface density is 373g/m2, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 8
The present embodiment is with the difference of embodiment 1, and negative pole surface density is 179g/m2, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 9
The present embodiment is with the difference of embodiment 1, and negative pole surface density is 187g/m2, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 10
The present embodiment is with the difference of embodiment 1, lipf6Concentration is 1.3mol/l, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
Embodiment 11
The present embodiment is with the difference of embodiment 1, lipf6Concentration is 1.7mol/l, other and embodiment 1
Identical.The key parameter of the present embodiment and performance data are as shown in table 4.
The key parameter of each embodiment of table 4 and performance data
Above content is to further describe it is impossible to recognize with reference to specific embodiment is made for the present invention
Determine the present invention be embodied as be confined to these explanations.Ordinary skill for the technical field of the invention
For personnel, without departing from the inventive concept of the premise, some simple deduction or replace can also be made,
Protection scope of the present invention all should be considered as belonging to.
Claims (10)
1. a kind of lithium ion battery of quickly-chargeable, including positive electrode, negative electrode and the barrier film being inserted between described positive electrode and negative electrode and organic electrolyte, it is characterized in that, the particle diameter d50 of the active material of described positive electrode is 3.1 ~ 8.1 microns, the particle diameter d50 of the active material of described negative electrode is 11.5 ~ 17.5 microns, and the positive pole surface density of described positive electrode is 357 ~ 373g/m2, the negative pole surface density of described negative electrode is 179 ~ 187g/m2.
2. lithium ion battery according to claim 1 is it is characterised in that the lithium salts in described organic electrolyte is lipf6, its concentration is 1.3 ~ 1.7mol/l.
3. lithium ion battery according to claim 1 is it is characterised in that described positive electrode and negative electrode are all using CNT as conductive agent.
4. the lithium ion battery according to any one of claim 1-3, it is characterized in that, the particle diameter d50 of the active material of described positive electrode is 5.6 microns, and the particle diameter d50 of the active material of described negative electrode is 14.5 microns, and the positive pole surface density of described positive electrode is 365g/m2, the negative pole surface density of described negative electrode is 183g/m2；Lithium salts in described organic electrolyte is lipf6, its concentration is 1.5mol/l；Described positive electrode and negative electrode are all using CNT as conductive agent.
5. lithium ion battery according to claim 1 is it is characterised in that the active material of described positive electrode is licoo2, the active material of described negative electrode is graphite.
6. lithium ion battery according to claim 1 is it is characterised in that the organic solvent in described organic electrolyte contains ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate.
7. lithium ion battery according to claim 1 is it is characterised in that described lithium ion battery charges to full of the time needing less than 2 hours, preferably 1.5 hours under 2.0c.
8. a kind of method of the lithium ion battery preparing quickly-chargeable is it is characterised in that methods described includes: with the active material of the positive electrode for 3.1 ~ 8.1 microns for the particle diameter d50 according to positive electrode positive pole surface density be 357 ~ 373g/m2Form positive electrode；With the active material of the negative electrode for 11.5 ~ 17.5 microns for the particle diameter d50 according to negative electrode negative pole surface density be 179 ~ 187g/m2Form negative electrode；Barrier film is inserted in formation battery core between described positive electrode and negative electrode, injects organic electrolyte, and be packaged into described lithium ion battery.
9. method according to claim 8 is it is characterised in that the lithium salts in described organic electrolyte is lipf6, its concentration is 1.3 ~ 1.7mol/l.
10. method according to claim 8 is it is characterised in that described positive electrode and negative electrode are all using CNT as conductive agent.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212198A (en) * | 2019-06-06 | 2019-09-06 | 合肥众禾动力新能源科技有限公司 | A kind of lithium ion battery of quickly-chargeable and preparation method thereof |
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