High-voltage lithium ion battery electrolyte

An electrolyte and lithium-ion technology, which is applied in the field of chemical materials, can solve the problems of battery performance degradation, electrical conductivity decline, and battery inoperability, etc., and achieve the effects of improving cycle life, excellent film-forming performance, and wide operating temperature

Inactive Publication Date: 2015-05-20
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this liquid electrolyte has been widely used, the following defects hinder its application in high-voltage lithium-ion batteries: (1) LiPF 6 The thermal and chemical stability is poor, especially at low temperature, it is prone to crystallization or solidification, and the viscosity increases, resulting in a sharp drop in electrical conductivity and a rapid increase in the interface impedance between the electrolyte and the electrode, which makes the battery unable to work; (2) when When the system voltage is higher than 4.5V, conventional carbonate-based electrolyte solvents such as EC will decompose and cause battery performance degradation

Method used

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Embodiment Construction

[0026] The following examples are used to illustrate several specific implementations of the present invention, but do not limit the present invention to these specific implementations. Those skilled in the art will realize that the present invention covers all alternatives, modifications and equivalents as may be included within the scope of the claims.

[0027] The present invention lists 1 to 14 kinds of electrolytes based on fluorine-containing sulfonimide lithium in the form of tables, and the test data of the capacity retention rate of the battery 1C after 100 cycles of each electrolyte, see the table below for details :

[0028] Table 1 Composition and battery capacity retention rate of high-voltage lithium-ion battery electrolyte

[0029]

[0030]

[0031]

[0032] Through the above-mentioned examples, especially after comparison with the comparative examples, it can be seen that the battery electrolyte provided by the present invention can greatly improve th...

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Abstract

The invention discloses high-voltage lithium ion battery electrolyte which comprises the following five components: (A) fluorine-containing lithium sulfimide, (B) other lithium salts, (C) a fluorinated organic solvent, (D) carbonate and / or ether type organic solvents and (E) other functional additives. The electrolyte disclosed by the invention has wide service temperature and excellent film-forming performance, can prolong the cycle life and improve high / low-temperature bearing capacity of electric automobiles and is particularly suitable for high-voltage lithium ion batteries of 4.35v or above.

Description

technical field [0001] The invention belongs to the technical field of chemical materials and relates to an electrolyte solution for lithium ion batteries. Background technique [0002] Due to the advantages of high working voltage, high energy density, low self-discharge rate, no memory effect, long cycle life and no pollution, lithium-ion batteries are widely used in various fields of daily life, including various portable electronic devices and electric vehicles, etc. . The main factor that determines the energy density, power density, and cost of lithium-ion batteries is the cathode material, in which the energy density is characterized by two parameters, voltage and capacity. Battery cathode materials with high voltage and large capacity are the development direction of smaller and lighter batteries in the future. , for example using LiNi 0.5 mn 1.5 o 4 and LiCoPO 4 The discharge voltage of lithium-ion batteries as high-voltage cathode materials can be as high as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0568
CPCH01M10/0568H01M10/0569Y02E60/10
Inventor 王传水陈慧闯徐卫国周晓崇赵卫娟
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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