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Electrolyte of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low oxidation resistance and large impedance, and achieve good thermal stability and great application value

Inactive Publication Date: 2013-01-16
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The electrolyte system of the present invention solves the problems of high impedance and low oxidation resistance of lithium-ion batteries using LiBOB and (or) LiODFB as electrolytes, and still It maintains the good thermal stability of LiBOB and LiODFB, improves the market competitiveness of LiBOB, LiODFB products and lithium-ion batteries, and has great application value

Method used

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  • Electrolyte of lithium ion battery
  • Electrolyte of lithium ion battery
  • Electrolyte of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 : In a glove box filled with argon, measure 1 mL SL and 1 mL DMS respectively, mix thoroughly, add 0.2713 g of electrolyte lithium salt LiBOB, stir until the lithium salt is completely dissolved, the ratio is: 0.7 mol / L LiBOB-SL / DMS.

[0016] figure 1 It is the impedance comparison diagram of the negative electrodes at room temperature of Example 1 and Comparative Example 1 after the first cycle, and the negative electrode material of the assembled battery is mesocarbon microspheres (MCMB). It can be seen that the impedance of the SEI film formed by the first cycle at room temperature in Example 1 is significantly lower than that of Comparative Example 1, indicating that the internal resistance of the battery assembled with the new electrolyte will be lower than that of LiPF 6 Battery.

Embodiment 2

[0017] Example 2 : In a glove box filled with argon, measure 1 mL SL and 1 mL DEC respectively, mix thoroughly, add 0.2713 g of electrolyte lithium salt LiBOB, stir until the lithium salt is completely dissolved, the ratio is: 0.7 mol / L LiBOB-SL / DEC.

Embodiment 3

[0018] Example 3 : In a glove box filled with argon, measure 1 mL SL, 1 mL GBL, and 1 mL DMC respectively. After mixing well, add 0.5791 g of electrolyte lithium salt LiBOB, and stir until the lithium salt is completely dissolved. The ratio is: 1.0 mol / L LiBOB-SL / GBL / DMC.

[0019] figure 2 It is the oxidation potential graph of embodiment 2, 3 and comparative example 1. It can be seen that the oxidation potential of the example is significantly higher than that of the comparative example.

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Abstract

Electrolyte of a lithium ion battery consists of lithium salt and an organic solvent, wherein the lithium salt is one of bis-oxalic acid lithium borate and lithium difluoroborate or a mixture of the bis-oxalic acid lithium borate and the lithium difluoroborate, the organic solvent consists of a component A, a component B and a component C, the component A is sulfolane, the component B is a linear carbonic ester compound or a linear sulfite compound or a mixture of the linear carbonic ester compound and the linear sulfite compound, and the component C is a cyclic carbonate compound. The molar concentration of the electrolyte lithium salt is 0.4-1.5 mol / L. The volume percentage of the sulfolane SL in the electrolyte is 11%-70%. The linear carbonic ester compound is one or more of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the volume percentage of the linear carbonic ester compound in the electrolyte is 0%-70%. The linear sulfite compound is one or more of sulphurous acid dimethyl ester and sulphurous acid diethyl ester, and the volume percentage of the linear sulfite compound in the electrolyte is 0%-70%.

Description

technical field [0001] The present invention relates to lithium ion battery electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in portable mobile phones, notebook computers and electric vehicles due to their high operating voltage, high specific energy, good safety performance, no memory effect, small self-discharge, long cycle life, and environmental friendliness. Electrolyte is an essential key material for lithium-ion batteries and has an important impact on battery performance. With the continuous expansion of the application field of lithium-ion batteries, higher requirements are put forward for the battery cycle performance, rate performance, high temperature adaptability, etc., and higher requirements are also put forward for the comprehensive performance of the electrolyte. [0003] At present, the electrolyte used in the market is mostly a mixture of carbonates, and the electrolyte is mainly lithium hexafluorophosphate (LiPF 6 )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566
CPCY02E60/12Y02E60/10
Inventor 李世友张宏明赵伟赵阳雨李步成李永立崔孝玲毛丽萍
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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