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Triketone electrolyte used for silicon negative electrode lithium battery

An electrolyte and lithium battery technology, which is applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems such as the type and amount of additives that need to be carefully studied, so as to improve the battery cycle life, reduce side reactions, and reduce battery life. The effect of flatulence

Inactive Publication Date: 2017-03-15
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of general additives should be reduced as much as possible when the effect is achieved, and in order to achieve good results, some of the different additives have a good effect when used alone, and some need to be used in combination for better results. The type and amount of additives need to be carefully considered. Research

Method used

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  • Triketone electrolyte used for silicon negative electrode lithium battery
  • Triketone electrolyte used for silicon negative electrode lithium battery
  • Triketone electrolyte used for silicon negative electrode lithium battery

Examples

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Embodiment 1

[0021] Organic solvent is ethylene carbonate, ethyl methyl carbonate (the volume ratio of the two is 40:60); Lithium salt is LiPF6, lithium salt concentration is 1M / L, and film-forming additive is ethylene carbonate and cyclopententrione, The proportions are 1% each, the anti-overcharge additive is 2,4-difluorobiphenyl, accounting for 1%, and the positive electrode protection additive is hexamethyldisilazane, accounting for 0.2%.

Embodiment 2

[0023] The organic solvent is ethylene carbonate, ethyl methyl carbonate (the volume ratio of the two is 40:60); the lithium salt is LiPF6, the lithium salt concentration is 1M / L, and the film-forming additive is 1,3-propane sultone and Cyclopentenetrione, each accounting for 1%, the anti-overcharge additive is 2,4-difluorobiphenyl, accounting for 1%, and the positive electrode protection additive is hexamethyldisilazane, accounting for 0.2% .

Embodiment 3

[0025] The organic solvent is ethylene carbonate, ethyl methyl carbonate (the volume ratio of the two is 40:60); the lithium salt is LiPF6, the lithium salt concentration is 1M / L, and the film-forming additive is fluoroethylene carbonate (FEC) and cyclic Pentenetrione accounts for 1% each, the anti-overcharge additive is 2,4-difluorobiphenyl, accounting for 1%, and the positive electrode protection additive is hexamethyldisilazane, accounting for 0.2%.

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Abstract

The invention discloses a triketone electrolyte used for a silicon negative electrode lithium battery, and belongs to the technical field of a lithium ion battery electrolyte. The triketone electrolyte comprises a lithium salt, an organic solvent and additives, wherein the concentration of the lithium salt in the organic solvent is 1-1.5mol / L; the dosage of the additives is 0.5-10%; the organic solvent is carbonate ester; and the additives comprise 0.2-2% of film-forming additive, 0.5-3% of anti-overcharging additive and 0.1-2% of positive electrode protection additive based on mass percentage, wherein the film-forming additive comprises 0.1-5% of cyclopentene triketone based on mass percentage. By reasonable preparation of the additives, the charge-discharge performance of the silicon negative electrode lithium battery can be effectively improved by virtue of the electrolyte containing the additives, and generation of side reactions is reduced, thereby reducing battery gas bubbling and prolonging the cycling life of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrolyte, and relates to a triketone electrolyte used for a silicon negative electrode lithium battery. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices such as notebook computers, mobile phones, and MP4s because of their advantages such as high working voltage, high energy density, environmental friendliness, stable cycle, and safety. However, with the improvement of battery capacity in electronic equipment, people have put forward higher requirements for the working voltage and energy density of lithium-ion batteries. [0003] The electrolyte is an important part of the battery, which is responsible for the transmission of ions between the positive and negative electrodes through the interior of the battery. It has an important impact on the capacity, operating temperature range, cycle performance and safety performance of the battery. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0565H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 刘鹏田丽霞梅银平
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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