Electrolyte for lithium ion batteries

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems affecting battery life, negative electrode SEI film rupture, and deterioration of battery performance, and achieve the effects of slowing down capacity decay, inhibiting dissolution, and excellent cycle performance

Inactive Publication Date: 2014-05-28
HUIZHOU CAPCHEM CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, at a high temperature of 45°C or higher, the SEI film of the negative electrode will rupture, and the metal ions of the positive electrode will continue to dissolve, which will deteriorate the battery performance and affect the battery life.

Method used

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  • Electrolyte for lithium ion batteries
  • Electrolyte for lithium ion batteries
  • Electrolyte for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The electrolyte is prepared in a glove box with a dew point controlled below -40°C. The configuration process is as follows: the weight ratio of ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) is EC:PC:EMC:DEC=25:5: Mix at 50:20, and then add lithium hexafluorophosphate to prepare a 1M (M is mol / L) electrolyte; and add 1% (by mass, the same below) tetramethyltetravinylcyclotetrasiloxane to it, After fully stirring and mixing uniformly, the desired electrolyte solution is obtained.

Embodiment 2

[0039] The electrolyte preparation method is the same as in Example 1, except that tetramethyltetravinylcyclotetrasiloxane is replaced by tetramethyltetravinylcyclotetrasilazane.

Embodiment 3

[0041] The preparation method of the electrolyte is the same as that of Example 1, except that 0.05% tetramethyltetravinylcyclotetrasiloxane is added to the electrolyte.

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Abstract

The invention discloses an electrolyte for lithium ion batteries, the electrolyte includes an organic solvent, a lithium salt and an additive, the additive is an additive (I), or a combination of the additive (I) and an additive (II) or an additive (III), the additive (I) is selected from tetramethyltetravinylcyclotetra-siloxane, the additive (II) is vinylene carbonate, and the additive (III) is halogenated ethylene carbonate. Because the electrolyte contains the tetramethyltetravinylcyclotetra-siloxane, during battery formation, a stable high-temperature-resistant passive membrane can be formed on positive pole surface, and can effectively restrain dissolving out of positive pole metal ions, and a more superior SEI (solid electrolyte interface) membrane is formed by a synergistic effect of a negative pole and other membrane additives so as to slowing the battery capacity decay in the charge and discharge processes and ensure the batteries have excellent cycle performances.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries. Background technique [0002] In recent years, portable electronic products, such as cameras, digital video cameras, mobile phones, notebook computers, etc. The trend of light weight and longer life is developing. Therefore, it is required to develop a power supply that is compatible with portable electronic products and power vehicles, especially a lightweight secondary battery that can provide high energy density. Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the characteristics of high energy density, high working voltage, long life, and environmental protection. [0003] Lithium-ion batteries are mainly composed of positive electrode, negative electrode, electrolyte and separator. The electrolyte, as a key material, plays the role of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 石桥谭光平
Owner HUIZHOU CAPCHEM CHEM CO LTD
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