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An electrolyte for secondary lithium battery and secondary lithium battery using this electrolyte

A secondary lithium battery and electrolyte technology, applied in secondary batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problem that the electrolyte cannot simultaneously have high electrical conductivity, anti-oxidation potential and thermal stability, etc. The effect of high oxidation potential, high safety performance and high electrical conductivity

Inactive Publication Date: 2007-12-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings that the existing electrolytes using piperidine ionic liquids cannot have high electrical conductivity, anti-oxidation potential and thermal stability at the same time, and provide a kind of electrolyte with high electrical conductivity, anti-oxidation potential and thermal stability. Stable electrolyte solution for secondary lithium battery

Method used

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  • An electrolyte for secondary lithium battery and secondary lithium battery using this electrolyte
  • An electrolyte for secondary lithium battery and secondary lithium battery using this electrolyte
  • An electrolyte for secondary lithium battery and secondary lithium battery using this electrolyte

Examples

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Embodiment 1

[0052] This embodiment is used to illustrate the electrolyte solution provided by the present invention.

[0053] At room temperature, 30 parts by weight of PP13-TFSI, 20 parts by weight of organic solvent (composed of DMC, DEC and EC in a weight ratio of 1:1:1), 30 parts by weight of 1,2-dimethyl-4-fluoro Pyrazole trifluoromethylsulfonyl imide (DMFP-TFSI) and 20 parts by weight of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) were uniformly mixed to prepare electrolyte sample D1.

Embodiment 2

[0055] This embodiment is used to illustrate the electrolyte solution provided by the present invention.

[0056] At room temperature, 15 parts by weight of PP14-TFSI, 40 parts by weight of organic solvent (composed of DMC and DEC at a weight ratio of 1:1), 5 parts by weight of N,N-dimethylimidazole trifluoromethylsulfonyl The amine and 40 parts by weight of LiTFSI were uniformly mixed to prepare electrolyte sample D2.

Embodiment 3

[0058] This embodiment is used to illustrate the electrolyte solution provided by the present invention.

[0059] At room temperature, 12 parts by weight of PP13-TFSI, 35 parts by weight of organic solvent (composed of DMC, DEC and EC in a weight ratio of 1:1:1), 18 parts by weight of N,N-dimethylimidazole trifluoroform Sulfonimide, 20 parts by weight of DMFP-TFSI and 40 parts by weight of LiTFSI were uniformly mixed to prepare electrolyte sample D3.

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Abstract

A kind of electrolyte used in secondary lithium battery includes lithium salt, ion liquid and organic solvent, thereinto, said ion liquid includes two ion liquids; the first ion liquid is piperidine class ion liquid, the second ion liquid is selected from one or more kinds of pyrromonazole class ion liquid and imidazole class ion liquid. The invention also provides secondary lithium battery using the electrolyte. The inoxidizable potential of the electrolyte in the invention is high, limit potential of negative pole is lower than separate out potential of metal lithium, conductivity is high, and safety of the secondary lithium battery using the electrolyte is high, high voltage secondary lithium battery that metal lithium is negative pole can be realized.

Description

technical field [0001] The present invention relates to an electrolyte and a battery containing the electrolyte, more specifically to an electrolyte for a secondary lithium battery and a secondary lithium battery containing the electrolyte. Background technique [0002] In secondary lithium batteries, lithium metal or carbon materials are mainly used as negative electrode materials. Lithium metal can provide large theoretical capacity and high output voltage when used as a negative electrode material, but the electrolyte currently used is mainly composed of organic solvents and lithium salts. The electrolyte containing organic solvents will chemically and electrochemically react with metallic lithium. It causes uneven passivation of the metal lithium surface, thereby generating lithium dendrites during charging and discharging, which makes the battery invalid and poses a safety hazard. As a new class of highly redox-stable electrolytes, ionic liquids are expected to fundame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/05H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 周耀华黄志娟
Owner BYD CO LTD