Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery, electrolyte technology, applied in the field of applied chemistry, can solve problems such as insufficient high pressure resistance

Active Publication Date: 2017-04-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of insufficient high-voltage resistance of lithium-ion batteries prep

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] Among them, according to a particularly preferred embodiment of the present invention, the high-pressure additives include: 4-cyanophenoxy, bis(methoxy)phosphate, bis(4-cyanophenoxy), methoxy Phosphate, 4-cyanophenoxy, cyanomethoxy, methoxy phosphate, 3,5-dicyanophenoxy, methoxy, trifluoroethoxy phosphate, 4-cyano Phenoxy, Methoxy, Trifluoroethoxy Phosphate, Bis(4-cyanophenoxy), Trifluoroethoxy Phosphate, Bis(3,5-Dicyanophenoxy), Tris Fluoroethoxy phosphate, 4-cyanophenoxy, bis(methoxy) phosphite, bis(4-cyanophenoxy), methoxy phosphite, 4-cyanophenoxy , cyanomethoxy, methoxy phosphite, 3,5-dicyanophenoxy, methoxy, trifluoroethoxy phosphite, 4-cyanophenoxy, methoxy, Trifluoroethoxyphosphite, bis(4-cyanophenoxy), trifluoroethoxyphosphite, and bis(3,5-dicyanophenoxy), trifluoroethoxyphosphite at least one of phosphate esters. More preferably, the high pressure additives include 3,5-dicyanophenoxy, methoxy, trifluoroethoxy phosphite, 4-cyanophenoxy, methoxy, trifluoroeth...

Embodiment 1

[0039] The electrolyte solution is configured in the glove box, which is filled with nitrogen with a purity of 99.999%, the water and oxygen content in the glove box is controlled at 6 A 1mol / L electrolyte solution is formed. Then add 1 gram of high-pressure additive (3,5-dicyanophenoxy, methoxy, trifluoroethoxy phosphite, as shown in the following formula) and 1 gram of 1,3-propanesulfonate to the above electrolyte solution Lactone, mixed uniformly to obtain the high-pressure non-aqueous electrolyte solution of the present embodiment.

[0040]

[0041] Wherein, the synthetic method of 3,5-dicyanophenoxy group, methoxyl group, trifluoroethoxy phosphite comprises: in a 1000ml three-necked flask, feed nitrogen to displace air, add 3,5- Dicyanophenol (432g, 3mol), phosphorus trichloride (137g, 1mol) was added dropwise and stirred, heated to reflux for 5-6h after the dropwise addition was completed, then decompressed distillation to remove HCl gas, column purification to obtain...

Embodiment 2

[0044] Prepare high-voltage non-aqueous electrolyte and lithium-ion battery according to the method of Example 1, the difference is that the high-voltage additive is 4-cyanophenoxy, methoxy, trifluoroethoxy phosphite, as shown in the following formula.

[0045]

[0046] Wherein, the synthetic method of 4-cyanophenoxy group, methoxyl group, trifluoroethoxy phosphite comprises: in a 1000ml there-necked flask, feed nitrogen to displace air, add 4-cyanophenol (357g, 3mol), phosphorus trichloride (137g, 1mol) was added dropwise and stirred, and after the dropwise addition was completed, it was heated to reflux for 5-6h, then the HCl gas was removed by distillation under reduced pressure, and the column was purified to obtain three (4-cyanophenoxy) Phosphite (335 g, 0.87 mol). Then three (4-cyanophenoxy) phosphite (335g, 0.87mol), add methanol (28g, 0.87mol) and trifluoroethanol (87g, 0.87mol), and stir reflux reaction 5-6h, then The 4-cyanophenol was removed by distillation und...

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Abstract

The invention provides a lithium ion battery electrolyte. The lithium ion battery electrolyte is a liquid containing a lithium salt and an organic solvent, the electrolyte also contains a high pressure additive, the high pressure additive comprises a phosphotriester organic matter and/or a phosphite triester organic matter, and the molecular structures of the phosphotriester organic matter and/or the phosphite triester organic matter respectively have at least one cyanophenyl group. The invention also provides a lithium ion battery. The lithium ion battery comprises a shell, a battery cell positioned in the shell, and the lithium ion battery electrolyte. The high pressure resistance of the lithium ion battery is substantially improved.

Description

technical field [0001] The invention relates to the field of applied chemistry, in particular to a lithium-ion battery electrolyte and a lithium-ion battery comprising the lithium-ion battery electrolyte. Background technique [0002] Lithium-ion battery electrolyte plays the role of conducting electrons between the positive and negative electrodes of the lithium-ion battery. It is generally prepared from high-purity organic solvents, electrolyte lithium salts, additives and other raw materials in a certain proportion under certain conditions. [0003] Improving the safety and energy density of lithium-ion batteries is an important innovation direction to increase the practical application value of lithium-ion batteries. Improving the working voltage of the battery is one of the effective ways to increase the energy density of lithium-ion batteries. High-voltage lithium batteries have not been applied to actual production so far. The biggest reason is that the electrochemica...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 任建新王圣
Owner BYD CO LTD
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