Electrolyte of lithium ion battery adopting natural graphite as negative material

A technology for lithium-ion batteries and negative electrode materials, which is applied in secondary batteries, circuits, electrical components, etc., can solve problems affecting electrolyte performance and side reactions, and achieve the effect of reducing intercalation and improving stability.

Inactive Publication Date: 2011-06-01
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the electrochemical activity of the microscopic surface of the natural graphite system is stronger than that of artificial graphite, which leads to side reactions on the surface of additives or organic solvents, which affects the performance of the electrolyte.

Method used

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  • Electrolyte of lithium ion battery adopting natural graphite as negative material
  • Electrolyte of lithium ion battery adopting natural graphite as negative material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] in an argon-filled glove box (H 2 (0<10ppm), each organic solvent is configured in the following proportions. Ethyl acetate (EC) / dimethyl carbonate (DMC) / ethyl methyl carbonate (EMC)=1:1:1 (wt%). The solvent accounts for 84.5% of the total weight of the electrolyte.

[0026] The lithium salt is lithium hexafluorophosphate (LiPF6), its concentration is 1 mole, and the solute accounts for 12.5% ​​of the total weight.

[0027] The addition of additive VC (vinylene carbonate) is 1%, the addition of additive FEC (fluoroethylene carbonate) is 1%, the additive dimethyl sulfite ((CH 3 ) 2 SO 3 ) in an amount of 1%. Add in order according to the above amounts, and fully stir evenly to obtain the lithium-ion battery electrolyte of the present invention.

Embodiment 2

[0029] in an argon-filled glove box (H 2 (0<10ppm), each organic solvent is configured in the following proportions. Ethyl acetate (EC) / dimethyl carbonate (DMC) / ethyl methyl carbonate (EMC)=1:1:1 (wt%). The solvent accounts for 84.5% of the total weight of the electrolyte.

[0030] The lithium salt is lithium hexafluorophosphate (LiPF 6 ), its concentration is 1 mole, and the solute accounts for 12.5% ​​of the total weight.

[0031] The addition amount of additive VEC (vinyl ethylene carbonate) is 1%, the addition amount of additive FEC (fluoroethylene carbonate) is 1%, the additive ethyl methanesulfonate (CH 3 CH 2 SO 3 CH 3 ) in an amount of 1%. Add in order according to the above amounts, and fully stir evenly to obtain the lithium-ion battery electrolyte of the present invention.

Embodiment 3

[0033] in an argon-filled glove box (H 2 (0<10ppm), each organic solvent is configured in the following proportions. Ethyl acetate (EC) / dimethyl carbonate (DMC) / ethyl methyl carbonate (EMC)=1:1:1 (wt%). The solvent accounts for 84.5% of the total weight of the electrolyte.

[0034] The lithium salt is lithium hexafluorophosphate (LiPF 6 ), its concentration is 1 mole, and the solute accounts for 12.5% ​​of the total weight.

[0035] The addition of additive VEC (vinyl ethylene carbonate) is 1%, the addition of additive FB (fluorobenzene) is 1%, the additive vinyl vinyl sulfite (C 4 h 6 SO 3 ) in an amount of 1%. Add in order according to the above amounts, and fully stir evenly to obtain the lithium-ion battery electrolyte of the present invention.

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Abstract

The invention relates to the technical field of electrolyte of a lithium-ion battery, in particular to electrolyte of a lithium ion battery adopting natural graphite as a negative material. The electrolyte comprises solute adopting lithium salt and an organic solvent for dissolving the solute, and a film additive which is beneficial to formation of a solid electrolyte film is added into the solvent. By adopting the technical scheme of the invention, the film additive which is beneficial to the formation of an SEI (Solid Electrolyte Interface) is added in the electrolyte, therefore, more stable SEI film can be formed on the surface of the natural graphite, the stability of the SEI film is improved, and the embedding quantity of solvent molecules is reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to an electrolyte for lithium-ion batteries using natural graphite as a negative electrode material. A film additive that facilitates the formation of a solid electrolyte membrane is added to the electrolyte. 【Background technique】 [0002] A common lithium-ion battery is formed by stacking (or winding) a positive electrode, a separator, and a negative electrode in sequence, and an electrolyte is added inside. Among them, the positive and negative electrodes are composed of current collectors and active materials coated on their surfaces, and the separator is made of microporous films by plasticization, extraction and other processes, so that lithium salts (such as LiPF 6 ) organic solvent electrolyte can be poured into it. The active material of the negative electrode is a substance that can intercalate and deintercalate lithium ions, such as graphite, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 侯涛
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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