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Method for refining overcharging additive biphenyl of lithium ion battery

A lithium-ion battery, overcharge additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high industrialization cost, high output of three wastes, environmental pollution, etc., and achieves convenient operation, simple process, and low energy consumption. Effect

Inactive Publication Date: 2013-06-05
TIANJIN JINNIU POWER SOURCES MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complex process and equipment, high energy consumption, easy introduction of new impurities, high cost of industrialization, high difficulty, high output of three wastes, and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 50Kg of dimethyl carbonate with a purity of 99.96% and a moisture content of 10PPm to a 100L dissolving tank, open and stir, and seal and add 25Kg of industrial biphenyl with a purity of 98.9%, raise the temperature to keep the temperature of the dissolving tank at 60°C, stir and dissolve for 2 Hours, under constant temperature, pressurize and pass through 0.45 micron precision filtration into the 100L crystallization tank, lower the temperature to keep the temperature of the crystallization tank at 10°C, after crystallization for 2 hours, filter and discharge the mother liquor, keep the temperature constant, then add 50Kg to the crystallization tank with a purity of Dimethyl carbonate with 99.96% moisture and 10PPm, turn on the stirring, stir at a constant speed for 1 hour, filter and discharge the washing liquid, blow it off, collect the product with a purity of 99.68%, moisture 57PPm, add 5% to the reference electrolyte After mixing, the chromaticity (APHA) index ...

Embodiment 2

[0030] Add 25Kg of dimethyl carbonate and ethyl methyl carbonate with a purity of 99.96% and a water content of 10PPm to a 100L dissolving tank, open and stir, and add 30Kg of industrial biphenyl with a purity of 98.9% in a sealed manner, and raise the temperature to keep the temperature of the dissolving tank constant Stir and dissolve at 60°C for 2 hours, pressurize at a constant temperature and pass through a 0.45 micron precision filter into a 100L crystallization tank. Add 25Kg of dimethyl carbonate and ethyl methyl carbonate with a purity of 99.96% and a moisture content of 10PPm to the crystallization tank, turn on the stirring, and after stirring at a constant speed for 1 hour, filter and discharge the washing liquid, blow it off, and collect the product with a purity of 99.65%. 70PPm, according to the addition amount of 5%, add it into the reference electrolyte solution and mix well, and the chromaticity (APHA) index is: 20, and the water content is 11PPm.

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Abstract

A method for refining overcharging additive biphenyl of lithium ion battery is characterized by comprising the following steps: firstly injecting appropriate amount of high-purity and low-water organic carbonic ester dissolvent with the temperature of 10-30 DEG C into a cased dissolving tank; adding appropriate amount of industrial biphenyl under the mixing state; keeping the temperature in 40-100DEG C for fully dissolving the biphenyl; infusing inert gas for protecting and pressurizing, introducing the solution into the cased crystallizing tank through a precise filter; keeping the temperature of crystallizing tank in 5-20 DEG C for crystallizing the biphenyl; after fully crystallizing, infusing inert gas into the crystallizing tank; filtering and discharging the mother solution; then mixing in the crystallizing tank and adding the high-purity low-water organic carbonic ester dissolvent into the crystallizing tank for washing the biphenyl crystal; after the crystal is fully washed, infusing the inert gas into the crystallizing pot for protecting and pressurizing; filtering and discharging the cleaning solution; and collecting the refined biphenyl material. The refined biphenyl istaken as overcharging agent and is directly used for preparing the non-water electrolyte of lithium ion battery.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte manufacturing technology, in particular to a method for refining biphenyl, an overcharge additive for a lithium-ion battery, which belongs to the organic matter refining and purification technology. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high working voltage, high specific energy, long cycle life, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, cameras, etc. Video recorders, electronic instruments, electric tools, electric vehicles, aerospace, military equipment and other fields. In recent years, the output of lithium-ion batteries has grown rapidly, and the application fields have continued to expand. It has become a high-tech product with important value in the 21st century. [0003] When the lithium-ion batteries cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/14C07C7/14H01M10/38H01M10/40
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 宁延生桑俊利赵庆云侯雷冯锐张艳华
Owner TIANJIN JINNIU POWER SOURCES MATERIAL
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