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Silicon carbon lithium ion battery electrolyte and silicon carbon lithium ion battery using same

A lithium-ion battery and electrolyte technology, applied in the field of silicon-carbon lithium-ion battery and silicon-carbon lithium-ion battery electrolyte, can solve problems such as instability of silicon-carbon negative electrode SEI film, improve cycle performance, increase cycle life, slow down side effects

Inactive Publication Date: 2019-03-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of instability of the existing silicon-carbon negative electrode SEI film, to provide a silicon-carbon lithium-ion battery electrolyte and a silicon-carbon lithium-ion battery using the electrolyte, which has excellent cycle performance , the silicon-carbon lithium-ion battery using this electrolyte has excellent cycle performance

Method used

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  • Silicon carbon lithium ion battery electrolyte and silicon carbon lithium ion battery using same
  • Silicon carbon lithium ion battery electrolyte and silicon carbon lithium ion battery using same
  • Silicon carbon lithium ion battery electrolyte and silicon carbon lithium ion battery using same

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specific Embodiment approach 1

[0011] Specific embodiment one: What this embodiment records is a kind of silicon carbon lithium ion battery electrolyte, comprises non-aqueous organic solvent, conductive lithium salt and film-forming additive, and described film-forming additive accounts for 8%~ of the total weight of electrolyte 15%, the film-forming additives include fluoroethylene carbonate (FEC), vinyl sulfate (DTD) and lithium difluorophosphate, in addition, also include phosphate compounds and / or phosphite compounds; The phosphoric acid ester compound is the material having the chemical structural formula shown in formula (I); The described phosphite compound is the material having the chemical structural formula shown in formula (II):

[0012]

[0013] In formula (I) and formula (II), R1, R2, R3, R4, R5, R6 are independently selected from hydrogen, alkane group, haloalkane group, alkenyl group, alkyne group, aromatic hydrocarbon group, halogenated aromatic hydrocarbon group any kind. The number of...

specific Embodiment approach 2

[0014] Specific embodiment two: a kind of silicon carbon lithium ion battery electrolyte described in specific embodiment one,

[0015] The substance having the chemical structural formula shown in formula (I) is specifically selected from at least one of T1-T5 compounds:

[0016]

[0017] The substance having the chemical structural formula shown in formula (II) is specifically selected from at least one of the following T6-T10 compounds:

[0018]

specific Embodiment approach 3

[0019] Specific embodiment three: a kind of silicon-carbon lithium-ion battery electrolyte described in specific embodiment one, described film-forming additive also comprises positive electrode film-forming additive, and described positive electrode film-forming additive is succinonitrile (SN), Adiponitrile (ADN), 1,3,6-hexanetrinitrile (HTCN), tris(trimethylsilyl) phosphate (TMSB), lithium difluorooxalate borate (LiODFB), lithium bisoxalate borate (LiBOB) at least one of the

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Abstract

A silicon carbon lithium ion battery electrolyte and a silicon carbon lithium ion battery using the same belong to the field of lithium ion battery materials. The electrolyte comprises a film-formingadditive accounting for 8% to 15% by weight of the total weight of the electrolyte. The film-forming additive comprises a phosphate ester / phosphite ester compound, fluoroethylene carbonate (FEC), ethylene sulfate (DTD) and lithium difluorophosphate (LiPO2F2). The electrolyte has excellent cycle performance. The phosphate ester / phosphite ester compound has chemical structural formulas shown by theformulas (I) and (II) which are described in the specifications.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular to a silicon-carbon lithium-ion battery electrolyte and a silicon-carbon lithium-ion battery using the electrolyte. Background technique [0002] As countries around the world have higher and higher requirements on the environment and stricter requirements on vehicle exhaust emissions, new energy vehicles have emerged as the times require, because lithium-ion batteries provide their power to reduce exhaust emissions. However, customers have higher and higher requirements for the mileage of electric vehicles, which requires continuous improvement of the energy density of lithium batteries. The use of high-energy-density silicon-carbon anode materials can greatly increase the energy density of batteries. However, the SEI film of the silicon-carbon negative electrode is unstable. During the cycle, the SEI of the negative electrode will be continuously destroyed and generate...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 母英迪李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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