Electrolyte additive for improving high-temperature performance of lithium battery, electrolyte and electrochemical device

An electrolyte additive and high-temperature performance technology, applied in the field of lithium batteries, can solve problems such as low solubility, high cost, and crystallization

Active Publication Date: 2021-11-16
XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these lithium salts still have other defects. For example, although LiBF4 has excellent high-temperature performance, its SEI film formation is unstable; LiBOB and LiF2PO 2, etc. have low solubility in carbonate solvent systems, and there is a risk of crystallization when the temperature changes; LiFSI is considered to be the most promising to re

Method used

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  • Electrolyte additive for improving high-temperature performance of lithium battery, electrolyte and electrochemical device
  • Electrolyte additive for improving high-temperature performance of lithium battery, electrolyte and electrochemical device
  • Electrolyte additive for improving high-temperature performance of lithium battery, electrolyte and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A mixed solvent of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) with a weight ratio of 1:1:1 is used as the organic solvent of the lithium battery electrolyte, and LiPF is added to it. 6 Lithium salt, vinylene carbonate (VC) and fluoroethylene carbonate (FEC) and electrolyte additive (compound I) according to the application, so that the concentration of electrolyte lithium salt is 1.0mol / L, vinylene carbonate The concentration is 2wt%, the concentration of fluoroethylene carbonate is 1wt%, and the concentration of compound I is 0.5wt%, thus obtaining the lithium battery electrolyte.

Embodiment 2

[0071] A lithium battery electrolyte was prepared in the same manner as in Example 1, except that the concentration of the electrolyte additive (compound I) according to the present application was 1.5 wt%.

Embodiment 3

[0073] A lithium battery electrolyte was prepared in the same manner as in Example 1, except that the concentration of the electrolyte additive (compound I) according to the present application was 3.0 wt%.

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Abstract

The invention discloses an electrolyte additive for improving the high-temperature performance of a lithium battery, an electrolyte and an electrochemical device. The electrolyte additive comprises at least one selected from a compound I or a compound II with a structure shown in the description, and the electrolyte additive can relatively improve the capacity retention ratio of a lithium battery containing the electrolyte additive at high temperature, and also can improve the capacity retention ratio at relatively high temperature and charge-discharge voltage.

Description

technical field [0001] The present application relates to the field of lithium batteries, more specifically, to an electrolyte additive for improving the high-temperature performance of a lithium battery, an electrolyte containing the electrolyte additive, and an electrochemical device. Background technique [0002] Lithium battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions (Li + ) to work by moving between positive and negative poles. During the charging process of lithium battery, Li + Deintercalation from the positive electrode, intercalation into the negative electrode through the electrolyte, makes the negative electrode in a lithium-rich state, and realizes the conversion of electrical energy into chemical energy, while the discharge process is just the opposite. [0003] Lithium batteries are widely used in 3C consumer batteries, power batteries, and energy storage batteries due to their high operating voltage, high energy densi...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 熊超杰郭敏
Owner XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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