Application of cyclic silicate compounds in battery electrolyte

A silicate and compound technology, applied in the direction of silicon organic compounds, compounds of elements of Group 4/14 of the periodic table, secondary batteries, etc., can solve the problems of battery capacity loss, battery performance reduction, and manufacturing cost increase, etc. To achieve the effect of improving high temperature cycle performance, increasing storage performance and improving performance

Inactive Publication Date: 2018-12-14
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent structure of these positive electrode materials changes under high voltage, and the transition metal is easy to dissolve and deposit on the negative electrode. In addition, the commonly used electrolyte usually decomposes at a voltage higher than 4V, producing gas, thereby will lead to a decrease in battery performance
In order to solve the above problems, researchers usually carry out surface protection coating or doping on the positive electrode material to improve the cycle performance under high voltage, but these methods are often accompanied by the loss of battery capacity, and the manufacturing process is cumbersome and the manufacturing cost increases.

Method used

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  • Application of cyclic silicate compounds in battery electrolyte
  • Application of cyclic silicate compounds in battery electrolyte
  • Application of cyclic silicate compounds in battery electrolyte

Examples

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Effect test

Embodiment 1

[0019] The battery electrolyte includes a lithium salt, an organic solvent and a cyclic silicate compound in a mass ratio of 20:79.99:0.01. The organic solvent is ethylene carbonate and methyl trifluoroacetate in a volume ratio of 40:60. The lithium salt is LiPF 6 , concentration 1mol / L. The additive is dimethyl silicate-1,4-butylene glycol ester, the purity is 99.6%, the moisture content is 34ppm, and the acid value is 42ppm

Embodiment 2

[0021] The battery electrolyte includes a lithium salt, an organic solvent and a cyclic silicate compound in a mass ratio of 20:70:10. The organic solvent is propylene carbonate, methyl propionate, and butyl trifluoroacetate in a volume ratio of 30:40:30. Described lithium salt is LiBF 4 , concentration 1mol / L. The additive is 1,5-pentanediol dimethyl silicate with a purity of 99.72%, a water content of 28 ppm and an acid value of 32 ppm.

Embodiment 3

[0023] The battery electrolyte includes a lithium salt, an organic solvent and a cyclic silicate compound in a mass ratio of 15:80:5. The organic solvent is gamma-butyrolactone and diethyl carbonate with a volume ratio of 50:50. The lithium salt is LiPF 6 , concentration 1mol / L. The additive is ethylene glycol diethyl silicate with a purity of 99.68%, a moisture content of 30 ppm, and an acid value of 37 ppm.

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Abstract

The application of cyclic silicate compound in battery electrolyte belongs to the technical field of battery electrolyte. The cyclic silicate compound is added into battery electrolyte as additive, and the addition amount is 0.01-10%. By adding cyclic silicate compound into the electrolyte of lithium battery, the low temperature discharge characteristics and life cycle characteristics of the battery are excellent. The decomposition reaction of carbonate-based organic solvents is suppressed even if the battery is stored at a high temperature in a fully charged state or is undergoing a charge/discharge process, thereby solving the expansion problem and improving the high temperature life cycle characteristics of the battery.

Description

technical field [0001] The invention belongs to the technical field of battery electrolytes, relates to an additive for battery electrolytes, and in particular relates to applying cyclic silicate compounds to battery electrolytes. By adding a cyclic silicate compound to the lithium battery electrolyte, the low-temperature discharge characteristics and life cycle characteristics of the battery are excellent; even when the battery is stored at a high temperature in a fully charged state or is undergoing a charge / discharge process, a carbonate-based organic solvent The decomposition reaction of the battery is also suppressed, thereby solving the swelling problem, and the high-temperature life cycle characteristics of the battery are also improved. Background technique [0002] Recently, there has been increasing interest in energy storage technologies. As energy storage technology extends to devices such as cellular phones, camcorders, notebook computers, personal computers, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569C07F7/08
CPCC07F7/0816H01M10/0569Y02E60/10
Inventor 葛建民苗强强闫彩桥王军郝俊张民武利斌侯荣雪
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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