Electrolyte of power lithium ion secondary battery

A secondary battery, lithium-ion technology, applied in the field of electrolyte, can solve the problems of component ratio not optimized in series, poor high-temperature cycle performance, small application range, etc., to achieve improved baking, good high and low temperature and rate performance, slow down effect of effect

Inactive Publication Date: 2014-04-02
JIANGXI CHC BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the power lithium-ion secondary battery industry, after 300 cycles at room temperature, the capacity retention rate of lithium-ion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The electrolytic solution of a kind of power lithium ion secondary battery of the present invention is formulated by electrolyte, main solvent and additive, and electrolyte is made of lithium hexafluorophosphate 8~13% and lithium dioxalate borate (LIBOB) 3~7%, and main solvent is made of Dimethyl carbonate (DMC) 28.0%-32.0%, ethyl methyl carbonate (EMC) 8.0%-13.0%, ethylene carbonate (EC) 5.0%-8.0% and propylene carbonate (PC) 4.0%-6.0% , the additives consist of ethylene sulfite (ES) 1.5% to 2.5%, vinylene carbonate (VC) 1.5% to 2.5%, 1,3-propane sultone (PS) 0.8% to 1.5%, anisole 0.2 %~0.4%, biphenyl (BP) 0.8%~1.5%, adiponitrile 0.01%~1.5%, 1-4-butylene diester (GBL) 0.8%~1.5% and cyclohexylbenzene (CHB) 0.8~1.5% %constitute.

Embodiment 2

[0022] The electrolytic solution of a kind of power lithium ion secondary battery of the present invention is formulated by electrolyte, main solvent and additive, and electrolyte is made of lithium hexafluorophosphate 10~11% and lithium dioxalate borate (LIBOB) 4~8%, and main solvent is made of Dimethyl carbonate (DMC) 30%, ethyl methyl carbonate (EMC) 10-11%, ethylene carbonate (EC) 6.0%-9.0% and propylene carbonate (PC) 5.0%-7.0%, the additive consists of Ethyl sulfate (ES) 2%, vinylene carbonate (VC) 2%, 1,3-propane sultone (PS) 1.0%, anisole 0.3%, biphenyl (BP) 1.0%, adiponitrile 0.01% to 1%, 1.0% of 1-4-butanediol (GBL) and 1.0% of cyclohexylbenzene (CHB).

Embodiment 3

[0023] Embodiment 3: the electrolytic solution of a kind of power lithium ion secondary battery of the present invention is formulated by electrolyte, main solvent and additive, and electrolyte is made of lithium hexafluorophosphate 10% and lithium dioxalate borate (LIBOB) 8%, and main solvent is made of Dimethyl carbonate (DMC) 35%, ethyl methyl carbonate (EMC) 11%, ethylene carbonate (EC) 9.0% and propylene carbonate (PC) 7.0%, the additive is ethylene sulfite (ES) 2% , vinylene carbonate (VC) 2%, 1,3-propane sultone (PS) 1.0%, anisole 0.3%, biphenyl (BP) 1.0%, adiponitrile 1%, 1-4-butane Composed of diester (GBL) 1.0% and cyclohexylbenzene (CHB) 1.0%.

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Abstract

The invention discloses an electrolyte of a power lithium ion secondary battery, which is prepared from an electrolyte, a main solvent and an additive according to certain mass percents; the electrolyte of the invention is characterized in that the electrolyte comprises 5-15% of lithium hexafluorophosphate and 1-10% of lithium bis(oxalate)borate; the main solvent comprises 25.0%-35.0% of dimethyl carbonate (DMC), 5.0%-15.0% of ethyl methyl carbonate (EMC), 3.0%-10.0% of ethylene carbonate (EC), and 2.0%-8.0% of propylene carbonate (PC); the additive comprises 1%-3% of ethylene sulfite (ES), 1%-3% of vinylene carbonate (VC), 0.5%-2.0% of 1,3-propane sultone (PS), 0.1%-0.5% of anisole, 0.5%-2.0% of biphenyl (BP), 0.01%-2% of adiponitrile, 0.5%-2.0% of gamma-butyrolactone (GBL), and 0.5%-2.0% of cyclohexylbenzene (CHB). The electrolyte of the invention can significantly improve conductivity, wettability, and high temperature circularity, thus enlarging the application scope of the electrolyte.

Description

technical field [0001] The invention relates to an electrolyte solution of a power lithium ion secondary battery, which belongs to the field of lithium batteries. Background technique [0002] With the development of microelectronics technology, there are more and more miniaturized mobile devices, which also put forward high requirements for the power supply of the devices. Lithium-ion batteries have entered the stage of large-scale use, and the research on lithium-ion batteries is also moving towards Developing in the direction of high rate, high cycle, and high capacity, power lithium-ion secondary batteries are widely used in notebooks, digital products, miner's lamps, electric bicycles, electric tools and other fields, and the demand is very large. [0003] At present, in the power lithium-ion secondary battery industry, after 300 cycles at room temperature, the capacity retention rate of lithium-ion batteries is between 80% and 95%. Problems such as small scope of appl...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567
CPCH01M10/0567H01M10/0569H01M2300/0042Y02E60/10
Inventor 龚明侯峰
Owner JIANGXI CHC BATTERY
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