High-temperature and high-voltage electrolyte and battery containing same

A technology of electrolyte solution and electrolyte salt, which is applied in the direction of non-aqueous electrolyte storage battery, lithium storage battery, secondary battery, etc., which can solve the performance degradation of battery charge and discharge cycles, poor matching of ternary positive electrode materials, and insufficient ternary positive electrode materials Stability and other issues, to achieve the effect of improving normal temperature cycle performance, improving high temperature storage performance and high temperature cycle performance, and inhibiting reduction reaction

Active Publication Date: 2022-05-13
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the working voltage of the battery assembled with the ternary positive electrode material is increased, the performance of the battery such as charge and discharge cycle decreases.
The reason may be: on the one hand, the ternary cathode material is not stable enough under high voltage, and on the other hand, the matching between the electrolyte and the ternary cathode material is not good, and the electrolyte will be oxidized and decomposed under high voltage conditions, resulting in The battery has poor high-temperature storage performance and high-temperature cycle performance

Method used

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  • High-temperature and high-voltage electrolyte and battery containing same
  • High-temperature and high-voltage electrolyte and battery containing same
  • High-temperature and high-voltage electrolyte and battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In a glove box filled with argon (oxygen content ≤ 1ppm, water content ≤ 1ppm), ethylene carbonate, ethyl methyl carbonate, and diethyl carbonate were uniformly mixed in a mass ratio of 1:1:1, and added to the mixture Add 0.3wt% of the first additive based on the total mass of the electrolyte and 1.2wt% of the second additive based on the total mass of the electrolyte (as shown in Table 1), and then add 12.5wt% of the total mass of the electrolyte Lithium hexafluorophosphate (LiPF 6 ), and stir to obtain the battery electrolyte of Example 1.

Embodiment 2～18

[0063] Embodiment 2~18 and comparative example 1~2

[0064] In Examples 2-18 and Comparative Examples 1-2, except that the amount and selection of the first additive and the second additive in the electrolyte are added as shown in Table 1, the others are the same as in Example 1.

[0065] The electrolyte composition of table 1 embodiment and comparative example

[0066] The first additive and content The second additive and content Example 1 0.3 wt% compound 1 1.2 wt% compound 9 Example 2 0.3 wt% compound 1 1.2 wt% compound 10 Example 3 0.3 wt% compound 1 1.2 wt% compound 11 Example 4 0.3 wt% compound 1 1.2 wt% compound 12 Example 5 0.3 wt% compound 1 1.2 wt% compound 13 Example 6 0.3 wt% compound 1 1.2 wt% Compound 14 Example 7 0.3 wt% compound 1 1.2 wt% compound 15 Example 8 0.3 wt% compound 2 1.2 wt% compound 9 Example 9 0.3 wt% compound 3 1.2 wt% compound 9 Example 10 0.3 wt...

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Abstract

The invention provides a high-temperature and high-voltage electrolyte and a battery containing the electrolyte, the electrolyte comprises an electrolyte salt, an organic solvent and an additive, and the additive comprises a first additive and a second additive; the first additive is selected from sulfonamide compounds, and the second additive is selected from oxazolone compounds. Through the synergistic effect of the first additive and the second additive, a film can be formed on the surface of a positive electrode, direct contact between an electrode material and an electrolyte is avoided, the microstructure of the electrode material is stabilized, dissolution of transition metal elements at high temperature is reduced, and an SEI film can be formed on the surface of a negative electrode material; and meanwhile, the interface impedance can be reduced, so that the high-temperature storage performance and the high-temperature cycle performance of the battery at high temperature and high voltage are effectively improved, and meanwhile, the normal-temperature cycle performance of the battery can be further improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a high-temperature, high-voltage electrolyte solution and a battery containing the electrolyte solution. Background technique [0002] Due to the advantages of high energy density, environmental friendliness, and long cycle life, ternary cathode materials are widely used in portable electronic devices such as mobile phones and notebook computers, electric vehicles, and large energy storage devices. At this stage, the energy density requirements for ternary cathode materials are getting higher and higher. [0003] Studies have shown that one of the effective ways to increase the energy density of ternary cathode materials is to increase the working voltage of the battery, which is the trend of battery development and an inevitable requirement for the development of new energy vehicles. However, when the operating voltage of the battery assembled with ternary cathode material is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052H01M2300/0025Y02E60/10
Inventor 王海李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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