Lithium ion battery electrolyte solution non-combustible in wide temperature area

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, to achieve the effects of stable high and low temperature performance, good market value, and high decomposition voltage

Inactive Publication Date: 2014-10-01
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some polyethers and their derivatives are synthetic polymers that are liquid at room temperature. It has been used as a lubricant for space mechanical components for decades, but it has not been reported as an electrolyte for lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Under anaerobic and anhydrous conditions, the polyether R′-CX2-CY2-(CY2CY2O)m- / -(CY2O)n-CY2-CX2-R, wherein, R, R′ is -OH (hydroxyl), m=n =5000; dissolve with dimethyl carbonate at a ratio of 1:2, and then dissolve in lithium trifluoromethanesulfonate with a molar concentration of 0.1mol / L. The electrolyte is non-flammable and has a temperature range of -30---90°C. The capacity of the assembled button battery is 980 mAH at room temperature 25°C, 810 mAH at low temperature of minus 30°C, and 1045 mAH at high temperature of 80°C.

Embodiment 2

[0031] Under anaerobic and anhydrous conditions, the polyether Rˊ-CX2-CY2-(CY2CY2O)m- / -(CY2O)n-CY2-CX2-R, wherein, R, Rˊ is CH3-O-COO-, that is H3C-O-COO-CX2-CY2-(CY2CY2O)m- / -(CY2O)n-CY2-CX2-O-COOCH3, X=Y=F(fluorine), m=n=1500; then dissolved in 1.5 mol / L Lithium bis(trifluoromethanesulfonate)imide. The electrolyte is non-flammable and has a temperature range of -80---300°C. The capacity of the assembled button battery is 1248 mAH at room temperature 25°C, 1020 mAH at low temperature of minus 40°C, and 1281 mAH at high temperature of 90°C.

Embodiment 3

[0033] Under anaerobic and anhydrous conditions, polyether Rˊ-CX2-CY2-(CY2CY2O)m- / -(CY2O)n-CY2-CX2-R, wherein R, Rˊ is CH3-O-COO-, which is H3C- O-COO -CX2-CY2-(CY2CY2O)m- / -(CY2O)n-CY2-CX2- O-COOCH3, X=Y=Cl(chlorine), m=n=1000; redissolved in 1.0mol / L Lithium bis(trifluoromethanesulfonate)imide. The electrolyte is non-flammable and has a temperature resistance range of -70---300°C. The assembled button battery has a capacity of 1183 mAH at room temperature of 25°C, a capacity of 946 mAH at a low temperature of minus 40°C, and a capacity of 1201 mAH at a high temperature of 90°C.

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Abstract

The invention discloses a lithium ion battery electrolyte solution non-combustible in a wide temperature area, and belongs to the field of lithium ion battery study. The lithium ion battery electrolyte solution comprises lithium salt as well as a polyether and derivative organic solvent. The lithium ion battery electrolyte solution is characterized in that the polyether and derivative organic solvent is taken as the solvent for the lithium ion battery to replace conventional carbonic ester combustible solvent; portions of polyether and derivatives are provided with low melting points, are still in liquid state at environment with temperature of -80 DEG, and exist stably at a high temperature of 200 DEG. Compared with conventional electrolyte solution, the lithium ion battery electrolyte solution acts out relatively high ionic electric conductivity in a relatively wide temperature range (-40 to 80 DEG), is high in flashing point and burning point, and acts out excellent specific capacity, cycle performance and security in wide temperature range as conventional battery electrolyte solution.

Description

technical field [0001] The invention provides a non-combustible electrolyte solution for a lithium-ion battery in a wide temperature range, which belongs to the technical field of electrochemistry. Background technique [0002] At present, the lithium-ion electrolyte is mainly composed of easily volatile, low-flash point organic solutions as solvents, such as ethylene carbonate, dimethyl carbonate, diethyl carbonate, etc.; it also contains lithium salts with low decomposition temperatures as solutes, For example lithium hexafluorophosphate etc. These are flammable and explosive chemicals. It has a great influence on the safety performance of lithium-ion batteries. Seriously hinder the large-scale application of lithium-ion batteries in automotive power batteries, aerospace, mobile base stations, etc. So far, the usual way to improve the safety performance of lithium-ion batteries is to add flame retardant additives to the electrolyte, such as alkyl phosphates, fluorinated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569
CPCH01M6/164H01M6/166H01M10/0568H01M10/0569Y02E60/10
Inventor 谢海明丛丽娜王钊孙立群王荣顺
Owner NORTHEAST NORMAL UNIVERSITY
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