CN109802131A - Lithium ion battery and its negative electrode tab and negative electrode material and preparation process - Google Patents
Lithium ion battery and its negative electrode tab and negative electrode material and preparation process Download PDFInfo
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- CN109802131A CN109802131A CN201910003563.9A CN201910003563A CN109802131A CN 109802131 A CN109802131 A CN 109802131A CN 201910003563 A CN201910003563 A CN 201910003563A CN 109802131 A CN109802131 A CN 109802131A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to field of lithium ion battery, disclose a kind of lithium ion battery and its negative electrode tab and negative electrode material and preparation process, negative electrode material includes: negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, binder, the negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, the mass percent of binder are as follows: 95%-96%, 0.2%-0.6%, 0.2%-0.6%, 2.8%-3.4%.Be conducive to improve the cryogenic property of lithium ion battery using the technical solution.
Description
Technical field
The present invention relates to field of lithium ion battery, a kind of lithium ion battery and its negative electrode tab and negative electrode material and system are disclosed
Standby technique.
Background technique
Lithium ion secondary battery has extended cycle life, energy density is high, specific capacity is high and pollution-free, causes
The broad interest of researchers.Under the situation that energy crisis and the whole world increasingly warm, lithium ion secondary battery is as novel
The clean energy becomes one of research hotspot.Lithium ion battery is commercialized so far for the first time since 1991, and lithium ion battery is wide
It is general to be used in the fields such as 3C class number and power vehicle.The cell positive material of mainstream is with LiFePO4 and ternary material at present
Based on, the advantages that and graphite is always because its coefficient of cubical expansion is small, embedding lithium platform and close lithium metal, is in occupation of negative electrode material
Absolute position.
In the use process of lithium ion battery, charge-discharge performance be influenced by temperature it is larger, main cause be electrolysis
Fluid viscosity is increased as temperature reduces, and for electrolyte under the conditions of highly viscous, ionic conductivity ratio is in room temperature or high temperature
Under reduce several orders of magnitude, therefore its charge/discharge capacity is extremely difficult to the capability value of room temperature, at the same time, at low temperature,
It is slow that lithium ion is difficult to be embedded in or be embedded in speed, be easy analysis lithium so as to cause cathode, eventually causes Capacity fading fast
As a result.In order to improve its cryogenic property, purpose is exactly to improve its ionic conductivity, added in negative electrode slurry it is a kind of have it is high from
The ion conductor of sub- conductivity is one and selects and set about a little well.
The method for improving cryogenic property at present mainly uses low-temperature electrolyte, and raw material is using with low melting point, low viscous
Spend linear carbonate, single film forming agent, single lithium salts and some other functional additives of high dielectric constant.Due to electrolysis
The big conductivity of viscosity is small, big at membrane impedance at low temperature for liquid, is unfavorable for the charge and discharge of battery, at low temperature so as to cause battery
Using effect is poor or directly resulting in battery is unable to charge and discharge.In addition, battery improves using cathode carbonization treatment in Ye You producer
Cryogenic property, at the same time, battery can eventually sacrifice some capacity, and then influence the specific energy density etc. of battery.
In order to solve lithium battery in the South and the North because of temperature difference, the especially low problem of efficiency for charge-discharge at low temperature, one
It is the cryogenic property for improving battery using low-temperature electrolyte；Second is that a certain amount of cobalt acid is added in positive LiFePO 4 material
Lithium improves the efficiency for charge-discharge under its low temperature.
Being disclosed in patent CN201610788459.1 by using low-temperature electrolyte improves cryogenic property.The present invention
People has found that the tetrafluoro boric acid lithium salts that the prior art is added, the boric acid introduced can be to battery in carrying out research of the invention
Substrate generates corrosion, and then may cause the generation of its side reaction to battery；In addition, the fluoro carbonic acid that the documents introduce
Vinyl acetate leads to greatly promoting for electrolyte cost.
In addition, disclosed in patent CN201010289760.0 in LiFePO 4 material be added biggest quality dosage be
The cobalt acid lithium of 10% amount, the present inventor have found that the application of the patented technology is not only increased into carrying out research of the invention
This, and it is unfavorable for environmental protection；Also, LiFePO4 and the discharge platform of cobalt acid lithium are inconsistent, are cobalt acid lithium before this at low temperature
Electricity is released, the amount of cobalt acid lithium be added is limited, its discharge capacity still will receive limitation under low temperature, not can effectively solve low temperature
Problem.
Summary of the invention
The first purpose of the embodiment of the present invention is to provide a kind of lithium ion battery and its negative electrode tab and negative electrode material and system
Standby technique, is conducive to improve the cryogenic property of lithium ion battery using the technical solution.
In a first aspect, a kind of negative electrode material suitable for lithium ion battery provided in an embodiment of the present invention, comprising: cathode is living
Property substance, conductive agent, fast-ionic conductor, binder,
The negative electrode active material, conductive agent, fast-ionic conductor, the mass percent of binder are as follows:
95%-96%, 0.2%-0.6%, 0.2%-0.6%, 2.8%-3.4%.
Optionally, the binder includes: sodium carboxymethylcellulose and butadiene-styrene rubber, mass percent are as follows:
1.2%-1.4%, 1.6%-2.0%.
Optionally, the negative electrode active material is graphite.
Optionally, the fast-ionic conductor are as follows: lithium lanthanum zirconium oxygen.
Optionally, the quality proportioning number of the conductive agent, lithium lanthanum zirconium oxygen are as follows:
0.3%-0.4%, 0.4%-0.5%.
Optionally, the quality of the negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, sodium carboxymethylcellulose, butadiene-styrene rubber
Percentage is as follows:
96%, 0.3%-0.4%, 0.4%-0.5%, 1.2%, 2.0%.
Second aspect, a kind of preparation process of lithium ion battery negative material provided in an embodiment of the present invention, comprising:
By scheduled mass percent, by negative electrode active material, conductive agent, fast-ionic conductor, binder, with stirring solvent
Uniformly to get negative electrode material slurry；
The negative electrode active material, conductive agent, fast-ionic conductor, the mass percent of binder are as follows:
95%-96%, 0.2%-0.6%, 0.2%-0.6%, 2.8%-3.4%.
Optionally, the binder includes: sodium carboxymethylcellulose and butadiene-styrene rubber, mass percent are as follows:
1.2%-1.4%, 1.6%-2.0%.
Optionally, by scheduled mass percent, by negative electrode active material, conductive agent, fast-ionic conductor, binder, with
Deionized water as solvent stirs evenly, comprising:
Take following mass percent:
Step 1:95%-96%, the negative electrode active material of 0.2%-0.6%, 0.2%-0.6%, 1.2%-1.4%
Matter, conductive agent, fast-ionic conductor, sodium carboxymethylcellulose, stir evenly；
Step 2: the solvent of predetermined amount is added, stirs evenly；
Step 3: the solvent of predetermined amount is further added, futher stirs to scheduled duration, quality percentage is added
Than the butadiene-styrene rubber for 1.6%-2.0%, futher stir to the negative electrode material slurry up to predetermined viscosity to obtain the final product.
Optionally, the step 1, step 2, the stirring rate between step 3 are sequentially incremented by.
Optionally, the negative electrode active material is graphite.
Optionally, the fast-ionic conductor are as follows: lithium lanthanum zirconium oxygen.
Optionally, the quality proportioning number of the conductive agent, lithium lanthanum zirconium oxygen are as follows:
0.3%-0.4%, 0.4%-0.5%.
Optionally, the quality of the negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, sodium carboxymethylcellulose, butadiene-styrene rubber
Percentage is as follows:
96%, 0.3%-0.4%, 0.4%-0.5%, 1.2%, 2.0%.
The third aspect, a kind of negative electrode for lithium ion battery piece provided in an embodiment of the present invention, including collector,
Above-mentioned any negative electrode material is coated on the collector.
Fourth aspect, a kind of negative electrode tab provided in an embodiment of the present invention, including collector,
Negative electrode material slurry made of above-mentioned any preparation process is coated on the collector.
5th aspect, a kind of lithium ion battery provided in an embodiment of the present invention, comprising:
Positive plate；
Above-mentioned any negative electrode tab；
Diaphragm is spaced between every positive plate and negative electrode tab；
Electrolyte impregnates the battery core bodies including the positive plate, negative electrode tab and diaphragm；
Shell, the electrolyte, battery core bodies are sealed in the shell.
11, the preparation process of lithium ion battery negative material according to claim 7, characterized in that the cathode
Active material is graphite.
12, the preparation process of lithium ion battery negative material according to claim 7, characterized in that it is described fastly from
Sub- conductor are as follows: lithium lanthanum zirconium oxygen.
13, the preparation process of lithium ion battery negative material according to claim 12, characterized in that the conduction
Agent, lithium lanthanum zirconium oxygen quality proportioning number are as follows:
0.3%-0.4%, 0.4%-0.5%.
14, the preparation process of lithium ion battery negative material according to claim 13, characterized in that
The mass percent of the negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, sodium carboxymethylcellulose, butadiene-styrene rubber
It is as follows:
96%, 0.3%-0.4%, 0.4%-0.5%, 1.2%, 2.0%.
15, a kind of negative electrode for lithium ion battery piece, characterized in that including collector,
Any negative electrode material on the collector coated with claim 1 to 6.
16, a kind of negative electrode tab, characterized in that including collector,
The slurry of negative electrode material made of any preparation process on the collector coated with claim 7 to 14
Material.
17, a kind of lithium ion battery, characterized in that include:
Positive plate；
Negative electrode tab described in claim 15 or 16；
Diaphragm is spaced between every positive plate and negative electrode tab；
Electrolyte impregnates the battery core bodies including the positive plate, negative electrode tab and diaphragm；
Shell, the electrolyte, battery core bodies are sealed in the shell.
Therefore using the present embodiment technical solution, adding fast-ionic conductor in negative electrode material (be can be, but not limited to
For lithium lanthanum zirconium oxygen (chemical formula are as follows: Li6.65Ga0.15La3Zr2O12, general abbreviation LLZO) improve lithium ion battery cryogenic property,
The ionic conductivity of fast-ionic conductor is high, is conducive to the conduction of ion when battery charging and discharging, fast when this is added in negative electrode slurry
When ion conductor, even if battery is under low-temperature condition, electrolysis fluid viscosity is reduced, and the ionic conductivity of electrolyte reduces, still
Fast-ionic conductor in pole piece, which still can work normally, keeps original ionic conductivity to make up electrolysis fluid viscosity raising and lead
The reduction of ionic conductivity is caused, further maintains lithium ion battery that there is good charge-discharge performance, improves its low-temperature circulating
Energy.
Also, fast-ionic conductor is added in negative electrode material as additive, with electrolyte, positive plate and negative electrode tab
Do not chemically react, will not chemistry to lithium ion battery and physical structure generate adverse effect.
Detailed description of the invention
Fig. 1 is the cryogenic property evaluation and test control of the sample of experimental example 1-8 and comparative example 1-3 that the embodiment of the present invention 1 provides
Figure.
Specific embodiment
Below in conjunction with specific attached drawing and embodiment, the present invention will be described in detail, herein illustrative examples of the invention
Attached drawing and explanation are used to explain the present invention, but not as a limitation of the invention.
It present embodiments provides one kind and is suitable for lithium ion battery negative material, it is living in addition to the cathode of the prior art
Property substance, conductive agent outside binder, further comprise fast-ionic conductor, wherein negative electrode active material, conductive agent, fastly from
Sub- conductor, the quality proportioning of binder are as follows: 95%-96%, 0.8%-1.2%, 0.8%-1.2%, 2.6%-3.8%.
As the signal of the present embodiment, the negative electrode active material of the present embodiment can be any of the prior art, such as can
With but be not limited to: graphite or modified graphite, such as silicon-carbon etc..
Conductive agent can be any cathode conductive agent of the prior art, for example can be, but not limited to are as follows: acetylene black, Super
P, Super S, 350G, carbon fiber (VGCF), carbon nanotube (CNTs), Ketjen black (KetjenblackEC300J,
KetjenblackEC600JD, Carbon Empa.s, Carbon Empa.s600JD) etc..
Binder is any negative electrode binder of the prior art, is such as but not limited to using by sodium carboxymethylcellulose, fourth
The binder of benzene rubber composition.Wherein sodium carboxymethylcellulose (Carboxymethyl, Cellulose Sodium, Sodium
Salt of Caboxy Methyl Cellulose, hereinafter referred to as CMC), and butadiene-styrene rubber (Styrene, 1,3-butadiene
Polymer, hereinafter referred to as SBR), also known as polystyrenebutadienes copolymer.When using CMC and SBR composition binder,
The mass percent that middle CMC and SBR accounts for negative electrode material is respectively as follows: 1.4%-1.8%, 1.2%-2.0%.
As the signal of the present embodiment, the fast-ionic conductor of the present embodiment (fast ionic conductor, also referred to as surpass from
Sub- conductor, is called sometimes and does solid electrolyte) it can be, but not limited to any for the prior art.
As the signal of the present embodiment, present embodiments provides two kinds and dash forward to the cryogenic property effect for improving lithium ion battery
Two kinds of fast-ionic conductors out, specifically Li-La-Ti oxygen, lithium lanthanum zirconium oxygen, can add when carrying out negative electrode material addition and wherein appoint
A kind of or mixing.
Therefore using the present embodiment technical solution, adding fast-ionic conductor in negative electrode material (be can be, but not limited to
For Li-La-Ti oxygen (chemical formula are as follows: Li0.35La0.55TiO3, commonly abbreviated as LLTO) and lithium lanthanum zirconium oxygen (chemical formula are as follows:
Li6.65Ga0.15La3Zr2O12, general abbreviation LLZO)) improve lithium ion battery cryogenic property, the ion-conductance of fast-ionic conductor
Conductance is high, is conducive to the conduction of ion when battery charging and discharging, when the fast-ionic conductor is added in negative electrode slurry, even if at battery
Under low-temperature condition, electrolysis fluid viscosity is reduced, and the ionic conductivity of electrolyte reduces, but the fast-ionic conductor in pole piece is still
It can work normally and keep original ionic conductivity to make up electrolysis fluid viscosity raising and lead to the reduction of ionic conductivity, into one
Step maintains lithium ion battery to have good charge-discharge performance, improves its low-temperature circulating performance.
Also, fast-ionic conductor is added in negative electrode material as additive, with electrolyte, positive plate and negative electrode tab
Do not chemically react, will not chemistry to lithium ion battery and physical structure generate adverse effect.
When the negative electrode material of application the present embodiment carries out lithium ion battery preparation, preparation process is as follows:
1, it by the configured negative electrode material of predetermined quality percentage and solvent (deionized water) will carry out that 4h is sufficiently stirred
~5h obtains the negative electrode material slurry of predetermined viscosity to uniform.
The proportion of the negative electrode material can be, but not limited to respectively by following:
Scheme one: graphite: SP: LLTO: CMC: SBR=96: 0.6: 0.2: 1.2: 2.0；
Scheme two: graphite: SP: LLTO: CMC: SBR=96: 0.4: 0.4: 1.2: 2.0；
Scheme three: graphite: SP: LLTO: CMC: SBR=96: 0.3: 0.5: 1.2: 2.0；
Scheme four: graphite: SP: LLTO: CMC: SBR=96: 0.2: 0.6: 1.2: 2.0；
Scheme five: graphite: SP: LLZO: CMC: SBR=96: 0.6: 0.2: 1.2: 2.0；
Scheme six: graphite: SP: LLZO: CMC: SBR=96: 0.4: 0.4: 1.2: 2.0；
Scheme seven: graphite: SP: LLZO: CMC: SBR=96: 0.3: 0.5: 1.2: 2.0；
Scheme eight: graphite: SP: LLZO: CMC: SBR=96: 0.2: 0.6: 1.2: 2.0.
2, it will be sufficiently mixed by the configured positive electrode of preset blending ratio, solvent N-methyl pyrilidone be added
(N-methyl-2-pyrrolidone, hereinafter referred to as NMP) persistently stirs 5h~6h, is sufficiently mixed material uniformly, obtains pre-
Determine the positive electrode slurry of viscosity.
As the signal of the present embodiment, the positive electrode of the present embodiment is matched with LiFePO4: SP: CNT: PVDF=95:
Be signal at 1.0: 1.0: 3.0.
3, positive electrode slurry, negative electrode material slurry are coated according to the prior art, obtain positive plate, negative electrode tab,
Positive plate, negative electrode tab are assembled into soft-package battery by the techniques such as roll-in, punching, lamination, later at 90 DEG C vacuum bakeout 20h~
30h, the pole piece water content after vacuum bakeout are controlled in 100ppm~400ppm.
4, a certain amount of commercially available conventional electrolysis liquid is perfused in the shell of the battery of moisture qualification, after through chemical conversion, partial volume,
Obtain the experimental cell to performance test.
5, it carries out the charge-discharge performance under different temperatures to the battery of above-mentioned preparation to test, the performance especially under low temperature is surveyed
Examination.
It to technical solution of the present invention and effective is further elaborated below with reference to experimental example.It should be understood that these realities
It applies example and is merely to illustrate the application rather than limitation scope of the present application.In the examples below, used material and examination
If agent is without specified otherwise, commercially purchase is obtained.
The beneficial effect of the present embodiment is further detailed below in conjunction with verifying embodiment.
Experimental example 1:
Take active material graphite 3000g, SP 18.75g, LLTO 6.25g (mass ratio 0.2%) and CMC37.5g low speed
30min is stirred, moderate-speed mixer 1h after 2000g deionized water is first stirred in advance is added, adds the deionized water of 1023.5g
Side high-speed stirred 3h is eventually adding after SBR 140g continuously stirs 30min and obtains viscosity 2500-3000mpa.s experimental slurries.
Anode sizing agent is according to mass ratio LiFePO4: SP: CNT: PVDF=95: 1.0: 1.0: 3.0, material is sequentially added, holds
Continuous stirring 5-6h, finally obtains the slurry of 6000-8000mpa.s.
Above-mentioned gained anode and cathode slurry is filtered, the Soft Roll of 4Ah is prepared by techniques such as coating, roll-in, punching, laminations
Battery.
At 90 DEG C after vacuum bakeout 20h~30h, control pole piece moisture injects 22-26g's in 100-500ppm later
Commercially available conventional electrolysis liquid.
After chemical conversion, partial volume, the experimental cell to performance test is obtained.
Experimental example 2:
The parameter of soft-package battery preparation removes material SP 12.5g and LLTO 12.5g (mass ratio 0.4%), remaining and implementation
Example 1 is consistent.
Experimental example 3:
The parameter of soft-package battery preparation removes material SP 9.38g and LLTO 15.63g (mass ratio 0.5%), remaining and implementation
Example 1 is consistent.
Experimental example 4:
The parameter of soft-package battery preparation removes material SP 6.25g and LLTO 18.75g (mass ratio 0.6%), remaining and implementation
Example 1 is consistent.
Experimental example 5:
The parameter of soft-package battery preparation is changed to LLZO except LLTO, remaining is consistent with embodiment 1.
Experimental example 6:
The parameter of soft-package battery preparation is changed to LLZO except LLTO, remaining is consistent with embodiment 2.
Experimental example 7:
The parameter of soft-package battery preparation is changed to LLZO except LLTO, remaining is consistent with embodiment 3.
Experimental example 8:
The parameter of soft-package battery preparation is changed to LLZO except LLTO, remaining is consistent with embodiment 4.
Comparative example 1
It takes active material graphite 3000g, SP: 25g and CMC: 37.5g to stir at low speed 30min, 2000g deionized water is added
Moderate-speed mixer 1h after first being stirred in advance is eventually adding SBR in the deionization waterside high-speed stirred 3h that 1023.5g is added:
140g obtains viscosity 2500-3000mpa.s experimental slurries after continuously stirring 30min.
Same anode sizing agent is according to mass ratio LiFePO4: SP: CNT: PVDF=95: 1: 1: 3, material is sequentially added, holds
Continuous stirring 5-6h, finally obtains the slurry of 6000-8000mpa.s.
Above-mentioned gained anode and cathode slurry is filtered, the Soft Roll of 4Ah is prepared by techniques such as coating, roll-in, punching, laminations
Battery.
At 90 DEG C after vacuum bakeout 20h~30h, control pole piece moisture injects 22-26g's in 100-500ppm later
Commercially available conventional electrolysis liquid.
After chemical conversion, partial volume, the experimental cell to performance test is obtained.
Comparative example 2
(this comparative example is with wide at present except commercially available conventional electrolysis liquid is changed to low temperature functional electrolyte for the parameter of soft-package battery preparation
The low-temperature electrolyte of the model " TC-8633 " of " Guangzhou Tianci Advanced Materials Co., Ltd " factory of general application is experiment
Signal), remaining is consistent with comparative example 1.
Comparative example 3
The parameter of soft-package battery preparation is except anode sizing agent is according to mass ratio LiFePO4: change at SP: CNT: PVDF=95: 1: 1: 3
Are as follows:
LiFePO4∶LiCoO2: SP: CNT: PVDF=95: 0.1: 0.9: 1: 3,
Remaining is consistent with comparative example 1.
Cryogenic property test:
The Soft Roll of above-mentioned preparation is taken to test, every group takes 15, and at -20 DEG C, the battery good to partial volume carries out 1C/1C's
The test of charge and discharge.
Using discharge capacity at room temperature as the basic comparison of data itself, hold with electric discharge gram volume and with electric discharge at room temperature
The size of the ratio of amount measures the quality of battery cryogenic property.
Table 1 is the assessment knot of the electric discharge gram volume and percent of discharge of comparative example 1-3 and experimental example 1-8 at low temperature
Fruit:
Table 1
It can be seen that electric discharge gram volume at low temperature and the electric discharge of the soft-package battery routinely made from 1 test result of table
Percentage be all it is lower, its cryogenic property has a certain upgrade after special low-temperature electrolyte is added, but amplitude is not
It is very greatly, 0.1%LiCoO to be added in anode sizing agent2Afterwards, the performance under low temperature is greatly improved, this is to have benefited from low temperature
A small amount of LiCoO down2Increase the electric conductivity and activity of positive active material at low temperature.
Experimental example 1-8 and comparative example 1-3 it can be found that experimental example 1-8 eight samples at -20 DEG C initial capacity hair
Wave it is all relatively good, all in 144mAh/g or so, and be not added the comparative example 1 of any ion conductor initial capacity play it is lower,
It is added to LLTO the or LLZO experimental example 1-8 of ion conductor, the electric discharge gram volume and percent of discharge under low temperature obtain 42%
Significantly increase.
Also, comparative experiments example 1-8 is it can be found that the additional amount of control LLTO, LLZO can effectively improve the low of battery
Warm nature energy.If LLTO addition is very few, the effect played is not it is obvious that if LLTO is added excessively, and electric discharge gram volume is not
It is obviously improved, in the experimental example 1-8 for accelerating ion conductor, illustrates that LLTO or LLzO that 0.4-0.6% is added can be most
Its cryogenic property of the performance of limits.
Attached drawing 1 is that the cryogenic property of the sample of experimental example 1-8 and comparative example 1-3 evaluates and tests comparative diagram, as can be seen from Figure 1
The low temperature discharge capacity and low temperature discharge percentage of experimental example 1-8 is substantially better than comparative example 1-3, also, in experimental example 2,3,6,7
Relative to experimental example 1,4,5,8 have intention less than cryogenic property advantage outstanding.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of negative electrode material suitable for lithium ion battery, characterized in that include: negative electrode active material, conductive agent, fast ion
Conductor, binder,
The negative electrode active material, conductive agent, fast-ionic conductor, the mass percent of binder are as follows:
95%-96%, 0.2%-0.6%, 0.2%-0.6%, 2.8%-3.4%.
2. the negative electrode material according to claim 1 suitable for lithium ion battery, characterized in that
The binder includes: sodium carboxymethylcellulose and butadiene-styrene rubber, mass percent are as follows:
1.2%-1.4%, 1.6%-2.0%.
3. the negative electrode material according to claim 3 suitable for lithium ion battery, characterized in that
The negative electrode active material is graphite.
4. the negative electrode material according to claim 1 or 2 or 3 suitable for lithium ion battery, characterized in that
The fast-ionic conductor are as follows: lithium lanthanum zirconium oxygen.
5. the negative electrode material according to claim 4 suitable for lithium ion battery, characterized in that
The quality proportioning number of the conductive agent, lithium lanthanum zirconium oxygen are as follows:
0.3%-0.4%, 0.4%-0.5%.
6. the negative electrode material according to claim 5 suitable for lithium ion battery, characterized in that
The negative electrode active material, conductive agent, lithium lanthanum zirconium oxygen, sodium carboxymethylcellulose, the mass percent of butadiene-styrene rubber are as follows:
96%, 0.3%-0.4%, 0.4%-0.5%, 1.2%, 2.0%.
7. a kind of preparation process of lithium ion battery negative material, characterized in that include:
It is equal with stirring solvent by negative electrode active material, conductive agent, fast-ionic conductor, binder by scheduled mass percent
It is even to get negative electrode material slurry；
The negative electrode active material, conductive agent, fast-ionic conductor, the mass percent of binder are as follows:
95%-96%, 0.2%-0.6%, 0.2%-0.6%, 2.8%-3.4%.
8. the preparation process of lithium ion battery negative material according to claim 7, characterized in that
The binder includes: sodium carboxymethylcellulose and butadiene-styrene rubber, mass percent are as follows:
1.2%-1.4%, 1.6%-2.0%.
9. the preparation process of lithium ion battery negative material according to claim 8, characterized in that
By scheduled mass percent, by negative electrode active material, conductive agent, fast-ionic conductor, binder, with going as solvent
Ionized water stirs evenly, comprising:
Take following mass percent:
Step 1:95%-96%, the negative electrode active material of 0.2%-0.6%, 0.2%-0.6%, 1.2%-1.4% are led
Electric agent, fast-ionic conductor, sodium carboxymethylcellulose, stir evenly；
Step 2: the solvent of predetermined amount is added, stirs evenly；
Step 3: the solvent of predetermined amount is further added, futher stirs to scheduled duration, mass percent, which is added, is
The butadiene-styrene rubber of 1.6%-2.0% is futher stirred to the negative electrode material slurry up to predetermined viscosity to obtain the final product.
10. the preparation process of lithium ion battery negative material according to claim 9, characterized in that
The step 1, step 2, the stirring rate between step 3 are sequentially incremented by.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492102A (en) * | 2019-08-19 | 2019-11-22 | 珠海冠宇电池有限公司 | A kind of electrodes of lithium-ion batteries and preparation method thereof and lithium ion battery |
| CN112670480A (en) * | 2020-12-24 | 2021-04-16 | 湖南艾华集团股份有限公司 | Lithium ion battery cathode with high energy density and preparation method thereof |
| CN114142011A (en) * | 2021-11-29 | 2022-03-04 | 蜂巢能源科技有限公司 | Hard carbon composite material and preparation method and application thereof |
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| CN110492102A (en) * | 2019-08-19 | 2019-11-22 | 珠海冠宇电池有限公司 | A kind of electrodes of lithium-ion batteries and preparation method thereof and lithium ion battery |
| CN112670480A (en) * | 2020-12-24 | 2021-04-16 | 湖南艾华集团股份有限公司 | Lithium ion battery cathode with high energy density and preparation method thereof |
| CN114142011A (en) * | 2021-11-29 | 2022-03-04 | 蜂巢能源科技有限公司 | Hard carbon composite material and preparation method and application thereof |
| CN114142011B (en) * | 2021-11-29 | 2023-06-16 | 蜂巢能源科技有限公司 | Hard carbon composite material and preparation method and application thereof |
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