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Lithium ionic cell electrolyte, preparation thereof and lithium ionic cell comprising the electrolyte

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of negative impact on battery cycle performance and reduced conductivity, and achieve good flame retardancy, low conductivity, and wettability good sex effect

Active Publication Date: 2009-02-04
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two types of phosphorus-containing flame retardant additives disclosed have certain flame retardancy, the addition of them often reduces the conductivity of the electrolyte and has a relatively large negative impact on the cycle performance of the battery.

Method used

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  • Lithium ionic cell electrolyte, preparation thereof and lithium ionic cell comprising the electrolyte
  • Lithium ionic cell electrolyte, preparation thereof and lithium ionic cell comprising the electrolyte
  • Lithium ionic cell electrolyte, preparation thereof and lithium ionic cell comprising the electrolyte

Examples

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Effect test

Embodiment 1

[0019] The organic fluorophosphorous compound used in this embodiment has the following structural formula:

[0020]

[0021] That is, all the hydrogens on the benzene ring in the general formula are replaced by fluorine, x=5, and the name of this substance is: three-(pentafluorophenyl) (Alfa Aisha, Tianjin).

[0022] The preparation method of the electrolyte is: mix dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) according to the ratio of 1:1:1 (mass ratio), and make 1M LiPF 6 electrolyte solution, and then add the above-mentioned organic fluorophosphorus compound with a weight ratio of 2% therein, and stir until the solids are all dissolved, that is, the lithium-ion battery electrolyte solution is obtained.

[0023] In order to measure the charging and discharging effect of the battery using the electrolyte prepared in this example, the following operations are carried out: use N-methyl-2-pyrrolidone (NMP) and LiMn 2 o 4 (produced by S...

Embodiment 2

[0033] In this embodiment, the organofluorophosphorus compound has the following structural formula:

[0034]

[0035] That is, the meta-hydrogen on the benzene ring is replaced by three fluorine atoms, x=3, and the name of this substance is: tris-(2,4,6-trifluorophenyl)phosphine (Alfa Aisha, Tianjin).

[0036] The preparation method of lithium-ion battery electrolyte is: will mix dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) according to the ratio of 1: 1: 1 (mass ratio), and prepare into 1M LiPF 6 electrolyte solution, and then add the above organic fluorophosphorus compound with a weight ratio of 10% to it until it is completely dissolved, and then the lithium ion battery electrolyte solution is obtained.

[0037] In order to measure the charging and discharging effect of the battery using the electrolyte prepared in this example, take the same steps to remove the aforementioned substances and carry out the following operations: use ...

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Abstract

The invention discloses a lithium-ion battery electrolyte as well as a preparation method thereof and a lithium-ion battery containing the electrolyte. The electrolyte contains organic fluorine phosphorus compounds as general formula I shows, wherein Ph represents phenyl, P represents phosphorus atom, F represents fluorine atoms, and x is the number of replaced fluorine atoms on the benzene ring, 0 H01M 10 / 40 2 5 2 2008 / 9 / 27 101359751 2009 / 2 / 4 000000000 South China Normal University Guangzhou 510630 Liang Ying Li Weishan Rao Mumin Zhao Lingzhi Cai Zongping yang xiaosong 44245

Description

technical field [0001] The invention relates to the manufacturing field of lithium ion batteries, in particular to an electrolyte of a lithium ion battery, a preparation method thereof and a lithium ion battery containing the electrolyte. Background technique [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high energy density, high operating voltage, long cycle life and low self-discharge. At present, small-capacity lithium-ion batteries have been successfully used in electronic products such as mobile phones, digital cameras and notebook computers. At the same time, large-capacity and high-power lithium-ion power batteries also have good application prospects. However, lithium-ion batteries emit a lot of heat when they are over-charged and discharged, short-circuited, and high-current for a long time. These heats become a safety hazard for flammable electrolytes, which may cause catastrophic thermal breakdown (thermal runaw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40
CPCY02E60/122Y02E60/10
Inventor 梁英李伟善饶睦敏赵灵智蔡宗平
Owner SOUTH CHINA NORMAL UNIVERSITY
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