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Electrolytical lithium salt and lithium ion battery electrolyte containing electrolytical lithium salt

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor thermal stability of lithium salts, achieve good overcharge performance, improve long-term cycle performance, and improve overall performance.

Inactive Publication Date: 2013-05-15
JIANGXI YOULI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiPF 6 The thermal stability of lithium salts is poor, and it is necessary to develop new lithium salts to supplement

Method used

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  • Electrolytical lithium salt and lithium ion battery electrolyte containing electrolytical lithium salt
  • Electrolytical lithium salt and lithium ion battery electrolyte containing electrolytical lithium salt

Examples

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Effect test

Embodiment 1

[0015] In a dry glove box filled with high-purity argon (H 2 O 2 6 ), accounting for 5% of the total weight, the new organic lithium salt LiC 11 h 6 BO 3 f 2 , accounting for 15% of the total weight; additives are vinylene carbonate (VC), accounting for 1% of the total weight, 1,3-propane sultone (1,3-PS), accounting for 1% of the total weight; press The above amounts are added in sequence, fully stirred evenly, and the lithium-ion battery electrolyte solution of the present invention is obtained.

Embodiment 2

[0017] In a dry glove box filled with high-purity argon (H 2 O 2 6 ), accounting for 14% of the total weight, the new organic lithium salt LiC 11 h 6 BO 3 f 2 , accounting for 0.5% of the total weight; additives are vinylene carbonate (VC), accounting for 2% of the total weight, fluoroethylene carbonate (FEC), accounting for 5% of the total weight; add in order according to the above amounts, and stir thoroughly Uniform, that is, to obtain the lithium ion battery electrolyte of the present invention.

Embodiment 3

[0019] In a dry glove box filled with high-purity argon (H 2 O 2 6 ), accounting for 12.5% ​​of the total weight, the new organic lithium salt LiC 11 h 6 BO 3 f 2 , accounting for 7% of the total weight; additives are vinylene carbonate (VC), accounting for 1% of the total weight, 1,3-propane sultone (1,3-PS), accounting for 1% of the total weight; according to The above amounts are added in sequence, fully stirred evenly, and the lithium-ion battery electrolyte solution of the present invention is obtained.

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Abstract

The invention discloses an electrolytical lithium salt and a lithium ion battery electrolyte containing the electrolytical lithium salt. The chemical formula of the electrolytical lithium salt is LiC11H6BO3F2; and the structural formula is shown in the specification. The lithium ion battery electrolyte contains a nonaqueous organic solvent, an additive and the electrolytical lithium salt, wherein the content of the electrolytical lithium salt accounts for 0.01-15% of the total weight of the electrolyte. According to the invention, through the introduction of the electrolytical lithium salt LiC11H6BO3F2, the comprehensive performance of the lithium ion battery electrolyte is improved; due to the lithium ion battery electrolyte, the charge and discharge capacities, coulombic efficiency and long cycle performance of a battery can be significantly improved; and the internal resistance of the battery is reduced to some extent. In addition, the lithium ion battery electrolyte containing the electrolytical lithium salt has a good overcharge performance.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrolytes, and more specifically relates to an electrolyte lithium salt LiC 11 h 6 BO 3 f 2 And lithium-ion battery electrolyte containing it. Background technique [0002] At present, commercial lithium-ion battery electrolytes have changed from the initial use of lithium hexafluorophosphate (LiPF 6 ) as the electrolyte, developed to use a variety of lithium salts. For example, lithium bis(trifluoromethylxanthimide) (LiTFSI), lithium bisoxalate borate (LiBOB), lithium difluorooxalate borate (LiDOFB), lithium tetrafluoroborate (LiBF 4 ) and other lithium salts. These lithium salts are continuously improved on the basis of B, N, P and other elements, or from LiPF 6 On the basis of continuous introduction of new functional groups. However, no matter what method is used, researchers hope that by improving the properties of the lithium salt itself, an electrolyte system with excellent the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCY02E60/12Y02E60/10
Inventor 王超颜果春王任衡
Owner JIANGXI YOULI NEW MATERIALS
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