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Electrolyte and application thereof

An electrolyte and lithium-ion battery technology, which is applied in composite electrolytes, circuits, electrical components, etc., can solve problems such as electrolyte needs to be improved, lithium-ion battery capacity decline, and battery hazards

Inactive Publication Date: 2020-12-08
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The HF generated in the above process is very harmful to the battery. For example, HF corrodes the positive electrode material, which will cause the transition metal elements to dissolve and migrate to the surface of the negative electrode, destroying the solid electrolyte interface film (SEI), causing the SEI to continue to grow, resulting in the failure of the lithium-ion battery. The capacity continues to decline, so LiPF 6 Electrolyte has extremely high environmental requirements during preparation and use
At the same time LiPF 6 The lower decomposition temperature also limits some battery modification processes, such as battery performance optimization processes such as thermal lamination after liquid injection; in addition, LiPF 6 The electrolyte of the main salt has low ionic conductivity and high viscosity at low temperature, which affects the low-temperature performance of the battery
[0005] In summary, the existing electrolytes for lithium-ion batteries still need to be improved

Method used

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  • Electrolyte and application thereof
  • Electrolyte and application thereof
  • Electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The total mass of the electrolyte is recorded as 100%, and the components of the electrolyte are weighed according to the following mass percentages:

[0040] EC: 24.5%;

[0041] PC: 4.5%;

[0042] PP: 4.5%;

[0043] DEC: 47.5%;

[0044] LiC(SO 2 CF 3 ) 3 : 8.7%;

[0045] LiODFB: 2.9%;

[0046] LiPF 6 : 2.9%;

[0047] Additives 4.5% (including DTD, 1,3-PS, VC, FPMS).

Embodiment 2

[0076] The electrolytes in Example 1 and Comparative Examples 1-3 were respectively taken, and the type of the electrolyte was used as a single variable to make batteries and conduct tests. The specific method of making the battery is as follows:

[0077] (1) Preparation of positive pole piece

[0078] Nickel cobalt lithium manganese oxide (NCM811) is selected as the active material of the positive electrode, and the ratio of nickel cobalt lithium manganese oxide (NCM811), binder polyvinylidene fluoride (PVDF), and conductive agent (LITX300) in the positive electrode slurry formula is 94.5:2 : 3.5, three kinds of materials are put into 50L stirring kettle in proportion and stir evenly, then add N-methylpyrrolidone (NMP) to prepare positive electrode slurry, control slurry solid content at 64% ± 2%. When the viscosity range of the slurry is 5000±1000 centipoise and the fineness is between 10 and 30 μm, the material is discharged, the slurry is coated on an aluminum foil with a t...

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Abstract

Electrolyte and application thereof are disclosed. The invention discloses an electrolyte for a lithium-ion battery and the lithium-ion battery. The electrolyte for the lithium-ion battery comprises amain lithium salt, an auxiliary lithium salt and an organic solvent, wherein the main lithium salt is tris(trifluoromethylsulfonyl) methyl lithium (LiC(SO2CF3)3), and the auxiliary lithium salt comprises lithium oxalyldifluoroborate(LiODFB) and lithium hexafluorophosphate(LiPF6). The electrolyte takes tri(trifluoromethylsulfonyl) methyl lithium as a main lithium salt, so that the high and low temperature performance of the battery can be obviously improved, the rate capability and the cycling stability of the battery are improved, and the direct-current internal resistance of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular, the invention relates to an electrolyte for lithium-ion batteries and the lithium-ion batteries. Background technique [0002] In the main material of the battery, the electrolyte is called the "blood" of the lithium-ion battery, and it is the medium for the transmission of lithium ions between the positive and negative electrodes. The dissociation ability of the electrolyte to lithium salts, the transmission rate of lithium ions in it, the high and low temperature stability, and the electrochemical window are key indicators to measure the performance of the electrolyte. From the current development trend of the electrolyte, according to the performance requirements of different lithium-ion batteries, selecting organic solvents and lithium salts with excellent performance and adding high-quality performance additives is the first choice to improve and meet battery per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0568H01M10/4235H01M2300/0088Y02E60/10
Inventor 周伟杰张芳芳张要军
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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