High-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance, preparation method and lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the electrolyte field, can solve problems such as unrecorded battery performance, and achieve the effect of taking into account the high temperature performance of the battery, taking into account the low temperature performance, and improving the low temperature

Inactive Publication Date: 2016-12-21
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the problem with the above solutions is that most of them have better capacity recovery rates at room temperature and high temperature, and the battery performance at low temperature is not recorded.

Method used

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  • High-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance, preparation method and lithium-ion battery
  • High-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance, preparation method and lithium-ion battery
  • High-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance, preparation method and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Battery production:

[0043] Positive electrode preparation: The ratio of positive electrode materials is: LiNi 0.5 co 0.2 mn 0.3 o 2 (lithium nickel cobalt manganese oxide), acetylene black (conductive agent), polyvinylidene fluoride (PVDF, binder) mass ratio is 94:3:3. Add PVDF to N-methyl-pyrrolidone (NMP), stir evenly, add acetylene black to the solution, stir evenly, then add lithium nickel cobalt manganese oxygen and stir evenly to form positive electrode slurry, coat positive electrode slurry with aluminum foil On top, the positive electrode sheet is baked, compacted, cut, and welded.

[0044] Negative electrode preparation: The ratio of negative electrode materials is silicon-carbon composite material, acetylene black, carboxymethyl cellulose (CMC), and propylene butyl rubber (SBR), with a mass ratio of 95:1.0:1.5:2.5. Add CMC into water, stir at high speed to dissolve completely, then add acetylene black, continue to stir until uniform, continue to add sil...

Embodiment 2

[0048] The preparation method of the electrolyte solution in Example 1 is adopted to prepare the electrolyte solution A2. The difference is that the additives added are fluoroethylene carbonate, maleic anhydride, lithium difluorophosphate, and lithium difluorooxalate phosphate, and the addition amounts account for 4% of the total mass respectively. 12.0%, 1.0%, 0.5%, 1.0%. Among them, lithium hexafluorophosphate accounts for 15.0% (about 1.20mol / L) of the total mass of the electrolyte, and the remaining components are non-aqueous solvents, which are composed of ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate mixture, ethylene carbonate, carbonic acid The mass ratio of dimethyl ester to ethyl methyl carbonate is 1:1:2.

[0049] S2 was prepared according to the method of Example 1 using the above electrolyte. The difference is that the cathode material is LiNi 0.8 co 0.15 al 0.05 o 2 (lithium nickel cobalt aluminum oxide), the negative electrode material is s...

Embodiment 3

[0051] The preparation method of the electrolyte in Example 1 is adopted to prepare the electrolyte A3, except that the additives added are fluoroethylene carbonate, 1,3 propane sultone, succinic anhydride, maleic anhydride, lithium difluorophosphate, Lithium difluorooxalate phosphate is added in an amount of 7.0%, 0.5%, 0.5%, 0.5%, 1.0%, and 0.5% of the total mass, respectively. Among them, lithium hexafluorophosphate accounts for 11.3% (about 0.90mol / L) of the total mass of the electrolyte, and the remaining components are non-aqueous solvents, which are composed of ethylene carbonate, dimethyl carbonate, ethyl acetate mixture, ethylene carbonate, dicarbonate The mass ratio of methyl ester to ethyl acetate is 1:1:2.

[0052] S3 was prepared according to the method of Example 1 using the above electrolyte. The difference is that the cathode material is LiNi 0.5 co 0.2 mn 0.3 o 2 (lithium nickel cobalt manganese oxide), the negative electrode material is silicon carbon co...

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Abstract

The invention discloses a high-capacity lithium-ion battery electrolyte of considering high-and-low temperature performance. The electrolyte comprises a non-aqueous solvent, lithium hexafluorophate, a negative film-forming additive, an inflatable inhibition additive and a low-impedance additive, wherein the negative film-forming additive is prepared from fluoroethylene carbonate which accounts for 3%-15% of total mass of the electrolyte; the inflatable inhibition additive is prepared from one or two of 1,3-propene sultone or anhydride compounds which account for 0.3%-5% of total mass of the electrolyte; and the low-impedance additive is prepared from one or two of lithium difluorophosphate and difluoride phosphate lithium oxalate which account for 0.2%-3% of total mass of the electrolyte. The electrolyte is suitable for a high-nickel positive electrode and silicon-carbon composite negative electrode lithium-ion battery; the high-temperature storage performance and the low-temperature discharge performance of the lithium-ion battery are improved while the room-temperature cycle performance is considered; and meanwhile, the invention further provides a preparation method of the electrolyte and the high-capacity lithium-ion battery of using the electrolyte.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a high-capacity lithium-ion battery electrolyte with both high and low temperature performance, a preparation method and a lithium-ion battery. Background technique [0002] Lithium-ion batteries with high energy density have received more and more attention. In order to improve the energy density of lithium-ion batteries, many efforts have been made on positive and negative electrode materials. In terms of positive electrodes, the charging voltage of the lithium-ion batteries of the three systems of lithium cobalt oxide, ternary material, and lithium manganate has reached 4.5V, but their energy density still cannot meet the requirements of electric vehicles and other high-energy electronic products. need. Nickel-cobalt lithium manganate ternary material Increasing the nickel content can greatly increase the specific capacity of the material, so the high-nickel ternary material is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525H01M10/056H01M10/0563
CPCH01M4/362H01M10/0525H01M10/056H01M10/0563Y02E60/10
Inventor 范伟贞余乐王海周顺武张利萍
Owner GUANGZHOU TINCI MATERIALS TECH
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