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A high-temperature lithium secondary battery electrolyte and battery

A lithium secondary battery, electrolyte technology, applied in secondary batteries, lithium storage batteries, organic electrolytes, etc., can solve problems such as inability to achieve performance, improve high-temperature cycle life, inhibit gas generation, and improve high-temperature storage. performance effect

Active Publication Date: 2022-05-27
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In summary, any single use of bicyclic sulfate compounds, monoisocyanate compounds, diisocyanate compounds, and monocyclic sulfate compounds cannot achieve optimal performance
[0016] At the same time, there is no evidence to directly point out that diisocyanate compounds and bispropenyl carbonate lactone compounds have similar properties and have any substitutability.

Method used

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  • A high-temperature lithium secondary battery electrolyte and battery
  • A high-temperature lithium secondary battery electrolyte and battery
  • A high-temperature lithium secondary battery electrolyte and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In this example, an electrolyte solution (100 g) comprising 1 M LiPF6 of a solvent in which ethylene carbonate and ethyl methyl carbonate are mixed in a mass ratio of 1:2 was prepared. Add the diisocyanate compound (0.03g) of the above chemical formula 1c and the bicyclic sulfate compound (1.0g) of the above chemical formula 2a to the electrolyte solution, the positive electrode material is LiNi0.8Co0.1Mn0.1O2; the negative electrode material is artificial graphite ; The diaphragm is a polyethylene film. A soft-pack lithium secondary battery was assembled according to a conventional method.

Embodiment 2

[0077] In place of the diisocyanate compound of Chemical Formula 1c (0.03 g), the diisocyanate compound of Chemical Formula 1c (0.5 g) and the bicyclic sulfate compound of Chemical Formula 2a (0.1 g) were added to the non-aqueous electrolyte of Example 1. g) A lithium secondary battery was prepared in the same manner as in Example 1, except for the bicyclic sulfate compound (1.0 g) of the above-mentioned Chemical Formula 2a.

Embodiment 3

[0079] In place of the diisocyanate compound of Chemical Formula 1c (0.03 g), the diisocyanate compound of Chemical Formula 1c (3.0 g) and the bicyclic sulfate compound of Chemical Formula 2a (1.0 g) were added to the non-aqueous electrolyte of Example 1. g) A lithium secondary battery was prepared in the same manner as in Example 1, except for the bicyclic sulfate compound (1.0 g) of the above-mentioned Chemical Formula 2a.

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Abstract

The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a high-temperature lithium secondary battery electrolyte and a battery. The high-temperature lithium secondary battery of the present invention comprises an additive composition composed of a diisocyanate compound and a bicyclic sulfate compound. When the composition is used together, it forms a flexible thin film on the surface of the negative electrode of the lithium secondary battery through a synergistic effect. The uniform SEI film can passivate the surface of the positive electrode at the same time, suppress the gas generation during the high-temperature storage of the lithium secondary battery, improve the high-temperature cycle performance and high-temperature storage performance, and increase the cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a high-temperature lithium secondary battery electrolyte and a battery. Background technique [0002] With the popularization of portable electronic devices, the secondary batteries required for the electronic devices tend to be miniaturized and light-weighted, so the energy density of the power sources for these devices is required to be higher and higher. Lithium secondary batteries are widely used in power, energy storage, aerospace, digital and other fields due to their high energy density, high charging efficiency, and long cycle life. [0003] The lithium secondary battery includes: a positive electrode composed of a transition metal oxide; a negative electrode composed of a carbon material, a silicon carbon material or a lithium alloy; an electrolyte solution composed of a lithium salt and a solvent. [0004] Since the solvent is volatile a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10H01M10/052H01M10/0568H01M10/0569
Inventor 范超君范伟贞赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH
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