Electrolyte and electrochemical device

An electrolyte and compound technology, applied in electrochemical generators, electrolytes, organic electrolytes, etc., can solve the problems of cycle performance and storage performance to be improved, and achieve the effects of improving electrochemical performance, inhibiting oxidation, and reducing side reactions.

CN110391459AActive Publication Date: 2019-10-29CONTEMPORARY AMPEREX TECH CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-10-29

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Abstract

The invention provides an electrolyte and an electrochemical device. The electrolyte includes an additive A and an additive B; the mass percentage content of the additive A in the electrolyte is 0.01-10%, and the mass percentage content of the additive B in the electrolyte is 0.1-10%; and the conductivity of the electrolyte at 25 DEG C is 6 mS / cm - 10 mS / cm. The cycle performance and storage performance of the electrochemical device can be enhanced, especially the cycle performance and storage performance of the electrochemical device under high temperature and high voltage can be increased, and low temperature performance can also be considered.
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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...

Examples

preparation example Construction

[0118] (2) Preparation of the compound shown in formula I-2:

[0119] The reaction equation is:

[0120]

[0121] The specific preparation process is:

[0122] 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.

[0123] (3) Preparation of the compound shown in formula I-3:

[0124] The reaction equation is:

[0125]

[0126] The specific preparation process is:

[0127] 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.

[0128] The electrochemical device according to the second aspect of the present application will be described below.

[0129] The electrochemical device accordi...