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Electrolyte and electrochemical device

An electrolyte and electrochemical technology, applied in the field of energy storage materials, can solve the problems of cycle performance and storage performance to be improved, and achieve the effects of improving electrochemical performance, reducing side reactions, and high decomposition temperature

Active Publication Date: 2021-01-15
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the above-mentioned electrolyte system. For example, under high voltage and high temperature conditions, the cycle performance and storage performance of the above-mentioned electrolyte system need to be improved.

Method used

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  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0122] (2) Preparation of the compound shown in formula I-2:

[0123] The reaction equation is:

[0124]

[0125] The specific preparation process is:

[0126] Mix anhydrous sodium carbonate, raw material P-4 and raw material P-3 in absolute ethanol, react and stir for 2h to 5h; wash with hot ethanol several times to obtain the crude product, and recrystallize to obtain the compound shown in formula I-2.

[0127] (3) Preparation of the compound shown in formula I-3:

[0128] The reaction equation is:

[0129]

[0130] The specific preparation process is:

[0131] Mix anhydrous sodium carbonate, raw materials P-5 and raw materials P-3 in absolute ethanol, react and stir for 2h to 5h; wash with hot ethanol several times to obtain a crude product, and recrystallize to obtain the compound shown in formula I-3.

[0132] The electrochemical device according to the second aspect of the present application will be described below.

[0133] The electrochemical device accordi...

Embodiment 1

[0181] Examples 1-12 are the effects of the mutual coordination of additives A and B in different proportions on the performance of lithium-ion secondary batteries. It can be seen from Example 1 that when the amount of additive A added is small and the amount of additive B added is large, the cycle performance of the lithium-ion secondary battery deteriorates, and the problem of gas production is improved to a certain extent, but the improvement effect is not great. The reason is: when the additive A is added in a small amount, the protective effect of the additive A on the positive active material is not obvious, while the additive B is added in a large amount, and the phenomenon of strong corrosion of the aluminum foil occurs under high voltage conditions, resulting in deterioration of the cycle performance. With the increase of Additive A and the decrease of Additive B, the synergistic advantages of Additive A and Additive B on lithium-ion secondary batteries are gradually m...

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Abstract

The present application provides an electrolyte and an electrochemical device. The electrolyte contains an additive A and an additive B. The mass percentage of the additive A in the electrolyte is 0.001% to 10%. The mass percentage content of B in the electrolyte is 0.1% to 10%. The present application can improve the cycle performance and storage performance of the electrochemical device, especially the cycle performance and storage performance of the electrochemical device under the condition of high temperature and high voltage.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to an electrolyte and an electrochemical device. Background technique [0002] Lithium-ion secondary batteries are widely used in electric vehicles and consumer electronics products due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. The current demand for lithium-ion secondary batteries is: high voltage, high power, long cycle life, long storage life and excellent safety performance. [0003] Lithium-ion secondary batteries currently widely use an electrolyte system in which lithium hexafluorophosphate is used as a conductive lithium salt and cyclic carbonate and / or chain carbonate is used as an organic solvent. However, there are still many deficiencies in the above-mentioned electrolyte system, for example, under the condition of high voltage and high temperature, the cycle performance and sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/42
CPCH01M10/0567H01M10/0566H01M10/4235H01M10/0525H01M6/168H01M2300/0025H01G11/64H01G11/06Y02E60/10C07D239/04C07D241/04C07D251/04H01M10/0568H01M10/0569
Inventor 伊天成胡春华苗露徐子俊梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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