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Non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and lithium salt technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as battery short circuit, achieve uniform deposition, ensure chemical stability, and improve battery safety.

Active Publication Date: 2017-07-14
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a non-aqueous electrolyte and a lithium-ion battery, aiming at the technical defect that lithium dendrites are easily formed in the existing electrolyte and cause a short circuit in the battery

Method used

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Examples

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Embodiment 1

[0037] The electrolyte solution was configured according to the following ratio, which was marked as Example 1. Set the water and oxygen content in the glove box to be less than 0.1ppm, and the temperature is room temperature. 10.0 grams of ethylene carbonate (EC), 30.0 grams of ethyl methyl carbonate (EMC) and 4.4 grams of HF 2 C-CF 2 -CF 2 -CF 2 -CH 2 -O-CF 2 -CF 2 Mix H evenly, seal it and put it in the refrigerator, wait for it to cool to 8°C, transfer it to the glove box, and then add LiPF 6 Mix well to form a lithium ion battery electrolyte with a lithium salt molar concentration of 1 mol / L to obtain a non-aqueous electrolyte with 10 wt.% polyfluorinated compounds, which is left to stand for three days for use.

Embodiment 2

[0039] The electrolyte solution was configured according to the following ratio, which was marked as Example 2. Set the water and oxygen content in the glove box to be less than 0.1ppm, and the temperature is room temperature. 10.0 grams of ethylene carbonate (EC), 30.0 grams of ethyl methyl carbonate (EMC) and 10.0 grams of HF 2 C-CF 2 -CF 2 -CF 2 -CH 2 -O-CF 2 -CF 2 Mix H evenly, seal it and put it in the refrigerator, wait for it to cool to 8°C, transfer it to the glove box, and then add LiPF 6 Mix well to form a lithium ion battery electrolyte with a lithium salt molar concentration of 1 mol / L to obtain a non-aqueous electrolyte with 20 wt.% polyfluorinated compounds, which is left to stand for three days for use.

Embodiment 3

[0041] The electrolyte solution was configured according to the following ratio, which was marked as Example 3. Set the water and oxygen content in the glove box to be less than 0.1ppm, and the temperature is room temperature. 10.0 grams of ethylene carbonate (EC), 30.0 grams of ethyl methyl carbonate (EMC) and 40 grams of HF 2 C-CF 2 -CF 2 -CF 2 -CH 2 -O-CF 2 -CF 2 Mix H evenly, seal it and put it in the refrigerator, wait for it to cool to 8°C, transfer it to the glove box, and then add LiPF 6 Mix well to form a lithium ion battery electrolyte with a lithium salt molar concentration of 1 mol / L to obtain a non-aqueous electrolyte with 50 wt.% polyfluorinated compounds, which is left to stand for three days for use.

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Abstract

The invention belongs to the technical field of lithium ion batteries and in particular relates to a non-aqueous electrolyte and a lithium ion battery. The invention provides the non-aqueous electrolyte which comprises a lithium salt and a flame-retardant additive; the flame-retardant additive comprises a polyfluorine compound or a mixture of the polyfluorine compound and a phosphorous-containing compound; the polyfluorine compound is one or more of polyfluoro chain carbonate, polyfluoro cyclic carbonate, polyfluoro chain ether and polyfluoro cyclic ether. A safety problem that the battery is short-circuited as the lithium ion battery is abused to easily form lithium dendrites is solved. Meanwhile, the invention also provides the lithium ion battery which comprises a lithium ion battery anode, a diaphragm, a cathode, an electrolyte and a battery housing. The electrolyte is the non-aqueous electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to nonaqueous electrolytic solutions and lithium ion batteries. Background technique [0002] Since the Italian physicist Volta invented the "Voda stack" in 1800, the development of chemical power has been more than 200 years. During this period, scientists from all over the world have invented many kinds of batteries. With the continuous development of battery technology, battery performance has been greatly improved, and the use of batteries is becoming wider and wider. In recent years, with the rapid development of science and technology, electronic equipment has become more and more portable and lightweight, and the battery field has received more and more attention. Lithium-ion batteries have become a research topic due to their high energy density and charge-discharge efficiency. hotspot. [0003] While enjoying the convenience brought by high-capacity lithium-...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 钟国彬徐凯琪梁栋栋苏伟郑浩魏增幅赵伟项宏发
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID