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High-safety lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery, high-safety technology, used in electrolytes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of reduced battery safety performance, increased internal temperature, and poor ability to dissolve lithium salts. The effect of reducing side reaction loss, delaying thermal runaway rate, and improving electrode stability

Active Publication Date: 2019-12-20
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing organic solvents have disadvantages such as small dielectric constant, poor ability to dissolve lithium salts, low conductivity, narrow electrochemical window, and low flashover, so the battery will be damaged under conditions such as heating, overcharge or overdischarge, short circuit, and high temperature. Excessive heat accumulation inside the battery will cause the electrolyte to decompose and produce a large amount of gas, causing a sharp increase in the internal pressure of the battery, causing safety hazards such as combustion or explosion
Therefore, the combination of high-voltage cathode materials with traditional electrolytes will inevitably reduce the safety performance of batteries.

Method used

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  • High-safety lithium ion battery electrolyte and lithium ion battery
  • High-safety lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Positive electrode preparation: mix the high-voltage positive electrode active material high-voltage 4.45V lithium cobaltate (Xia Tungsten New Energy), CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to the mass ratio of 98.5:0.5:1.0 and mix evenly , and then dispersed in N-methyl-2-pyrrolidone to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, and the positive electrode sheet is obtained after rolling and cutting, and finally after baking and vacuum drying stand-by.

[0038] (2) Negative electrode preparation: mix artificial graphite negative electrode material (Jiangxi Zichen), acetylene black, CMC (carboxymethyl cellulose), SBR (carboxylated styrene-butadiene rubber) according to the mass ratio of 96.8:1.0:1.2:1.0, and then Dispersed in deionized water to obtain negative electrode slurry; the negative electrode slurry is evenly coated on both sides of the copper foil, ro...

Embodiment 2

[0042] Different from Example 1 is the preparation of the electrolyte: in a nitrogen-filled glove box (O 2 , 5% ionic liquid B 2 , to obtain a mixed solution; then slowly add a mixture of lithium hexafluorophosphate and lithium bisoxalate borate accounting for 15% of the total mass of the electrolyte to the mixed solution to prepare a lithium salt solution with a concentration of lithium hexafluorophosphate of 1.2mol / L, which is prepared after mixing evenly electrolyte.

[0043] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0045] The difference from Example 1 is the preparation of the electrolyte: in a nitrogen-filled glove box (O 3 , 10% ionic liquid B 3 , to obtain a mixed solution; then slowly add a mixture of lithium hexafluorophosphate and lithium difluorooxalate borate accounting for 15% of the total mass of the electrolyte to the mixed solution to prepare a lithium salt solution with a concentration of lithium hexafluorophosphate of 1.2 mol / L, and mix well to prepare into electrolyte.

[0046] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-safety lithium ion battery electrolyte, which comprises an organic solvent, a lithium salt andan additive, wherein the additive comprises a main additive and an auxiliary additive, and the main additive is at least one of a pyrrole ionic liquid and a phosphorus-containing ionic liquid. The major characteristic of the lithium ion battery electrolyte is that the ionic liquid additives are combined, so that a formed protective film has better high voltage resistance, the side reaction loss of the electrolyte is effectively reduced, and the cycle life and the electrode stability of the battery are improved; and the thermal runaway rate of the battery is delayed through the thermal conductivity of the electrolyte, especially a flame retardant element or group is introduced, the flame retardant effect of the battery is improved, and the passing of puncture performance and weight impacttests of the battery is more facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-safety lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] In recent years, with the increasing demand for lithium-ion batteries in electronic products and electric vehicles, lithium-ion batteries have developed rapidly. At the same time, the requirements for high energy density and high power of batteries have also been continuously improved. Lithium-manganese materials, high-voltage lithium cobaltate, high-voltage ternary materials, etc. have been applied, and the voltage of batteries is constantly increasing. [0003] The electrolyte is formed by dissolving an appropriate amount of lithium salt in a non-protonated high-purity organic solvent. The organic solvent must meet the requirements of good electrochemical stability, high dielectric constant to ensure high conductivity, low melting point, high boiling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0091Y02E60/10
Inventor 高学友泉贵岭张霞朱坤庆计阳楚英
Owner 东莞维科电池有限公司
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