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Flame-retardant electrolyte for lithium ion batteries and preparation method and application thereof

A lithium ion battery and electrolyte technology, which is applied in the field of flame retardant electrolyte and its preparation, can solve the problem that the safety and electrical conductivity of lithium ion batteries cannot be satisfied at the same time, and achieve the effects of low cost, simple method and good application prospect.

Active Publication Date: 2010-05-05
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The primary purpose of the present invention is to overcome the deficiency that the electrolyte for lithium-ion batteries provided by the prior art cannot satisfy the safety and conductivity of lithium-ion batteries at the same time, and provide a flame-retardant electrolyte for lithium-ion batteries

Method used

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  • Flame-retardant electrolyte for lithium ion batteries and preparation method and application thereof
  • Flame-retardant electrolyte for lithium ion batteries and preparation method and application thereof
  • Flame-retardant electrolyte for lithium ion batteries and preparation method and application thereof

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Embodiment 1

[0031] (1) Mix ethylene carbonate (EC), methyl-ethyl carbonate (EMC) and di-methoxy-methyl phosphate (DMMP) in a volume ratio of 42.5:42.5:15, using 4 Molecular sieves, calcium hydride and sodium hydride to remove impurities and water, and then filter under reduced pressure in a glove box filled with high-purity argon to obtain solvent A;

[0032] (2) At room temperature, the LiPF 6 Dissolved in above solvent A, LiPF 6 The concentration is 1mol / L, and stir evenly, obtain solvent B;

[0033] (3) Add LiPF equivalent to step (2) used in solvent B 6 Lithium diacetate borate with 5% mass is mixed evenly to obtain a flame-retardant electrolyte for lithium-ion batteries.

Embodiment 2

[0035] (1) Mix ethylene carbonate (EC), methyl-ethyl carbonate (EMC) and di-methoxy-methyl phosphate (DMMP) in a volume ratio of 40:40:20, using 4 Molecular sieves, calcium hydride and sodium hydride purely remove impurities and water, and then filter under reduced pressure in a glove box filled with high-purity argon to obtain solvent A;

[0036] (2) At room temperature, the LiPF 6 Dissolved in above solvent A, LiPF 6 The concentration is 1mol / L, and stir evenly, obtain solvent B;

[0037] (3) Add LiPF equivalent to step (2) used in solvent B 6 Lithium diacetate borate with 5% mass is mixed evenly to obtain a flame-retardant electrolyte for lithium-ion batteries.

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Abstract

The invention discloses a flame-retardant electrolyte for lithium ion batteries and a preparation method and application thereof. In the invention, the preparation method comprises the following steps: mixing cyclic carbonate, chain carbonate and dimethoxy methyl phosphate according to the volume ratio of 1:1:(0.35-0.5), purifying the mixture, and then, adding lithium salts with the concentration of 0.8-1.2mol / L; and then, adding lithium borate diacetate the quality of which is equivalent to 5-10% of the quality of the lithium salts to obtain the flame-retardant electrolyte for lithium ion batteries. The flame-retardant electrolyte of the invention can not be burnt or fired and can effectively improve the safety performance of the lithium ion batteries; and the heat stability of the flame-retardant electrolyte is obviously improved, and after the energy is stored for more than 3 months at 85 DEG C, color of the electrolyte can not be changed, and the electrolyte can not be precipitated. The initial discharge capacity, the cycle performance and the conductivity of the lithium ion batteries prepared from the flame-retardant electrolyte of the invention are equivalent to the initial discharge capacity, the cycle performance and the conductivity of the lithium ion batteries prepared from the standard electrolyte. The flame-retardant electrolyte of the invention has lower cost and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte systems, and in particular relates to a flame-retardant electrolyte for lithium-ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become a research hotspot in the field of new energy due to their high operating voltage, high energy density, and long cycle life. With the continuous development of commercialization of lithium-ion batteries, improving the cycle performance, high-low temperature discharge performance and safety performance of lithium-ion batteries has attracted people's attention. At present, the electrolyte of commercial lithium-ion batteries is LiPF 6 Dissolved in organic carbonate or ether, it can meet the needs of most household electronic devices, such as digital cameras, mobile phones and notebook computers. However, it also means that the organic solvents used in commercial lithium-...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 许梦清邢丽丹李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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