Process for stabilizing color and lustre of non-aqueous electrolyte

A non-aqueous electrolyte, color technology, applied in alkaline storage batteries, ion exchange treatment devices, selective adsorption and other directions, can solve the problem of easy discoloration of non-aqueous electrolytes

Active Publication Date: 2010-05-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the problem that the existing non-aqueous electrolyte is easy to change color, and to provide a method for stabilizing the color of the non-aqueous electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) 400g of fine-pored silica gel was vacuum dried at 100 degrees Celsius for 20 hours, and then filled into a silica gel column.

[0014] (2) Take 1000ml of the non-aqueous electrolyte of the lithium-ion battery to be treated, with a water content of 20ppm and a color of 5APHA.

[0015] Wherein: the non-aqueous electrolyte ratio (mass ratio) is: dimethyl carbonate: diethyl carbonate: ethyl methyl carbonate = 1:1:1, and 1% carbonic acid by weight of the electrolyte Vinylene ester, 1% biphenyl, 0.5% 1,3-propane sultone; 1mol / L lithium hexafluorophosphate.

[0016] (3) Pass through silica gel column at a rate of 200ml / h.

[0017] (4) Obtain 960ml lithium-ion battery electrolyte product, water 18pm, inert gas protection and avoid light preservation.

[0018] (5) The color test after 90 days is 5APHA; the color test after 180 days is 10APHA.

Embodiment 2

[0020] (1) After 500 g of fine-pored silica gel is vacuum dried at 200 degrees Celsius for 16 hours, it is filled into a silica gel column.

[0021] (2) Take 1500ml of the lithium-ion battery electrolyte to be processed, with a moisture content of 15.4ppm and a color degree of 7.5APHA.

[0022] Among them: the electrolyte ratio (mass ratio) is: ethyl methyl carbonate: ethylene carbonate: diethyl carbonate = 2:1:1, and 1% vinylene carbonate by weight of the electrolyte, 1.5% Phenylcyclohexane; 1mol / L lithium hexafluorophosphate.

[0023] (3) 300ml / h through silica gel column.

[0024] (4) Obtained 1430ml lithium-ion battery electrolyte product with a moisture content of 13.2ppm, protected by inert gas and kept away from light.

[0025] (5) The color test after 90 days is 7.5APHA; the color test after 180 days is 7.5APHA.

Embodiment 3

[0027] (1) 200g of fine-pored silica gel is vacuum dried at 250 degrees Celsius for 8 hours, and then filled into a silica gel column.

[0028] (2) Take 800ml of the lithium-ion battery electrolyte to be processed, with a water content of 21.7ppm and a color of 5APHA.

[0029] Note: The electrolyte ratio (mass ratio) is: ethyl methyl carbonate: ethylene carbonate: diethyl carbonate = 1:1:1, and 2% vinylene carbonate by weight of electrolyte, 0.5% 1,3-propane sultone; 1.5mol / L lithium hexafluorophosphate.

[0030] (3) 400ml / h through silica gel column.

[0031] (4) Obtain 740ml of lithium-ion battery electrolyte product, protected from light by inert gas.

[0032] (5) The color test after 90 days is 7.5 APHA; the color test after 180 days is 10 APHA.

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Abstract

The present invention provides method of lowering chroma of non-aqueous electrolyte, and the method includes one step of making the compounded non-aqueous electrolyte flow through silica gel column filled with silica gel of granularity 0.5-8 mm and average pore size 1-5 nm. The present invention provides simple method for solving the problem of discoloration of electrolyte in lithium ion cell. Themethod can make electrolyte in lithium ion cell possess chroma change in 180 days lower than 15 APHA.

Description

Technical field [0001] The invention relates to a method for preventing discoloration of non-aqueous electrolyte and stabilizing color. Background technique [0002] Non-aqueous electrolyte is an important part of lithium ion secondary batteries. Due to various reasons, non-aqueous electrolytes are easily discolored during storage and transportation. There are many factors that cause the discoloration of the non-aqueous electrolyte, among which trace impurities and moisture are an important factor that promotes the darkening of the non-aqueous electrolyte. The possible reason is that the existence of the above substances promotes the decomposition of the electrolyte and causes the discoloration of the electrolyte. . The discoloration of the electrolyte will directly affect the sales and use of non-aqueous electrolyte. Summary of the invention [0003] The technical problem to be solved by the present invention is to overcome the problem that the existing non-aqueous electrolyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/08H01M10/26
CPCY02E60/124Y02E60/10
Inventor 陈明
Owner BYD CO LTD
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