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Electrolyte containing lithium bis (fluoromalonate) phosphoryl imide and lithium ion battery using electrolyte

A technology of lithium bisfluoromalonate phosphorimide and lithium malonate phosphorimide is applied in non-aqueous electrolyte storage batteries, electrolyte storage battery manufacturing, secondary batteries, etc., and can solve the problems of safety and high and low temperature. Unable to take into account the problems, to solve the safety and high and low temperature can not take into account, low impedance, high conductance effect

Active Publication Date: 2021-01-05
香河昆仑新能源材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte solution of the present invention can solve the problem that the safety under high voltage and the high and low temperature cannot be taken into account in the current non-aqueous electrolyte solution of lithium ion battery

Method used

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  • Electrolyte containing lithium bis (fluoromalonate) phosphoryl imide and lithium ion battery using electrolyte
  • Electrolyte containing lithium bis (fluoromalonate) phosphoryl imide and lithium ion battery using electrolyte
  • Electrolyte containing lithium bis (fluoromalonate) phosphoryl imide and lithium ion battery using electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A LiCoO 2 / The artificial graphite battery includes a positive pole, a negative pole, a diaphragm, and a non-aqueous electrolytic solution prepared according to the present invention, and the total weight of the non-aqueous electrolytic solution is 100 wt%.

[0034]The solvent in the non-aqueous electrolyte is prepared by mixing ethylene carbonate (EC): diethyl carbonate (DEC): ethyl methyl carbonate (EMC) at a ratio of 3:2:5 (vol:vol:vol); additive 1wt % vinylene carbonate (VC), 0.5wt% 1,3-propane sultone (PS); using 12.5wt% LiPF 6 and 5 wt% bisfluoromalonate phosphoramidite.

Embodiment 2-5 and comparative example 1-5

[0036] In Examples 2-5 and Comparative Examples 1-5, except that the electrolyte lithium salt and additives are different, others are the same as Example 1. The details are shown in Table 1.

[0037] Table 1

[0038]

[0039]

[0040] Experimental examples 1-5 and comparative examples 1-5 were respectively tested for high-temperature cycle performance and high-temperature storage performance. The test indicators and test methods are as follows:

[0041] (1) High temperature cycle performance - reflected by testing the capacity retention rate of the battery at 45°C 1C cycle N times, the specific method is:

[0042] The battery was placed in an environment of 45°C, and the formed battery was charged to 4.5V with 1C constant current and constant voltage (LiCoO 2 / artificial graphite), the cut-off current is 0.02C, and then discharged to 3.0V with a constant current of 1C. After such a charge / discharge cycle, calculate the capacity retention rate after the 200th cycle to ...

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Abstract

The invention provides an electrolyte containing lithium bis (fluoromalonate) phosphoryl imide and a lithium ion battery using the electrolyte; the electrolyte comprises a lithium salt, a solvent andan additive, and the additive comprises lithium bis (fluoromalonate) phosphoryl imide shown as a formula I in the specification. According to the electrolyte disclosed by the invention, the lithium bis (fluoromalonate) phosphoryl imide is used as an additive, so that the lithium battery applying the electrolyte has relatively low impedance, relatively high conductivity, good thermal stability andchemical stability, and the problem that the safety, high temperature and low temperature of the non-aqueous electrolyte of the lithium ion battery cannot be considered at the same time can be solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte containing lithium bisfluoromalonate phosphorimide, a lithium ion battery using the electrolyte and applications thereof. Background technique [0002] Lithium cobalt oxide (LiCoO 2 ) is the earliest commercial lithium-ion battery cathode material. Due to its high material density and electrode compaction density, lithium-ion batteries using lithium cobalt oxide cathodes have the highest volumetric energy density, so lithium cobalt oxide is the most widely used cathode material in the consumer electronics market. Increasing the charging voltage of lithium cobalt oxide batteries can increase the volumetric energy density of the battery. The charging cut-off voltage has gradually increased from 4.20V when it was first commercialized in 1991 to 4.45V (vs Li+ / Li), and the volumetric energy density has exceeded 700Wh / Li L. In general, the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 万广聪程梅笑郭营军申海鹏杨冰郑畅庞文博
Owner 香河昆仑新能源材料股份有限公司