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Cyclic silicate compound used in battery electrolyte and preparation method thereof

A technology of electrolyte and silicate, which is applied in the fields of compounds of group 4/14 elements of the periodic table, chemical instruments and methods, and secondary batteries, etc. Long working hours and other problems, to achieve the effect of increasing reversible specific capacity, high purity and low acid value

Active Publication Date: 2021-03-12
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing battery electrolyte additives are prepared, there are many wastes, high energy consumption, long working hours, and large investment in equipment, which is not conducive to industrialized mass production and the concept of green environmental protection.

Method used

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  • Cyclic silicate compound used in battery electrolyte and preparation method thereof
  • Cyclic silicate compound used in battery electrolyte and preparation method thereof
  • Cyclic silicate compound used in battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dimethyl silicate-1,4-butanediol, the structural formula is as follows:

[0030]

[0031] The above-mentioned 1,4-butanediol dimethyl silicate is prepared from 1,4-butanediol and dimethyldichlorosilane as follows, including the following steps: adding 1.1 mol of 1,4- Dissolve butanediol in ethylene dichloride, then add 1mol dimethyldichlorosilane dropwise at 23°C, control the temperature during the dropwise addition to not exceed 35°C, and add dimethyldichlorosilane by volume The ratio 1:2:3 is divided into three parts, and then the three times of dripping time are controlled to be 8min, 10min, and 12min in sequence. After the dropping is completed (the detection temperature is 30°C), firstly, heat at a heating rate of 1°C / min for 10min. Then heat at a heating rate of 5°C / min for 19 minutes, then heat at a heating rate of 0.5°C / min for 10 minutes, and then heat up to 140°C, and then perform a heat preservation reaction (by timing, the heat preservation reaction only ...

Embodiment 2

[0034] 1,5-pentanediol dimethyl silicate, the structural formula is as follows:

[0035]

[0036] The above-mentioned 1,5-pentanediol dimethyl silicate is prepared from 1,5-pentanediol and dimethyldichlorosilane as follows, including the following steps: adding 1.3 mol of 1,5- Pentylene glycol was dissolved in ethylene glycol dimethyl ether, and then 1mol dimethyldichlorosilane was added dropwise at 27°C. During the dropping process, the temperature was controlled not to exceed 35°C. According to the volume ratio of 1:2:3, it is divided into three parts, and then the three times of dropping time are controlled to be 8min, 10min, and 12min. 15min, then heated at a heating rate of 5°C / min for 18.4min, then heated at a heating rate of 1°C / min for 10min, raised to 150°C, and then carried out a heat preservation reaction (by timing, the heat preservation reaction only needs 1.5h). Then add N,N-dimethylaniline, adjust the pH value to 6, stir for 25 minutes, suction filter while ...

Embodiment 3

[0039] Ethylene glycol diethyl silicate, the structural formula is as follows:

[0040]

[0041] The above-mentioned ethylene glycol diethyl silicate is prepared from ethylene glycol and diethyldichlorosilane as follows, including the following steps: dissolving 1.2 mol of ethylene glycol in toluene, and then at 25°C Add 1 mol of diethyldichlorosilane dropwise, and control the temperature during the dropping process to not exceed 35°C. During the dropwise addition, divide diethyldichlorosilane into three parts according to the volume ratio of 1:2:3, and then control the three times of dropping Adding time is 8min, 10min, 12min in turn. After the dropwise addition is completed (detection temperature is 32°C), first heat at a heating rate of 0.5°C / min for 10min, then heat at a heating rate of 3°C / min for 15min, and then heat at a heating rate of 0.5°C Heating at a heating rate of 1 / min for 5 minutes, raising the temperature to 84.5°C, and then performing a heat preservation r...

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Abstract

The cyclic silicate compound used in the battery electrolyte and its preparation method belong to the technical field of the battery electrolyte, and the structure of the compound is shown in the following formula: wherein n≥2, R 1 , R 2 Selected from C1-C8 straight chain alkyl or branched chain alkyl, when n=2 or 3, R 1 , R 2 Not simultaneously methyl. The present invention also provides a cyclic silicate compound used in the battery electrolyte and a preparation method thereof. Adding the cyclic silicate compound prepared in the present invention to the battery electrolyte can significantly improve the performance of the battery. The present invention The preparation method is simple in operation, the preparation process is mild and stable, and the synthesis time for preparing the cyclic silicate compound is greatly shortened through the process control of the invention.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte, and relates to a cyclic silicate compound used in the battery electrolyte and a preparation method thereof. Background technique [0002] In recent years, portable electronic devices such as video cameras, digital cameras, cellular phones, and notebook computers have been widely used, and reducing their size and weight and achieving their long lifespan have become urgent demands. Accompanying this demand, batteries, particularly secondary batteries that are small and lightweight and capable of obtaining high energy density have been developed as power sources. [0003] Among them, lithium ion secondary batteries in which lithium ions are inserted and extracted for charge and discharge reactions, lithium metal secondary batteries in which lithium metal is deposited and dissolved, and the like are very promising. This is because such secondary batteries can provide higher energy densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/18H01M10/0567
CPCC07F7/188H01M10/0567Y02E60/10
Inventor 闫彩桥葛建民苗强强王军郝俊张民武利斌侯荣雪
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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