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Additive, non-aqueous electrolyte containing additive and lithium ion battery

A non-aqueous electrolyte and additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as accelerated oxidation and decomposition of electrolytes, deterioration of positive electrode materials, etc., to achieve optimized interface, improve high-temperature cycle performance, and improve high-temperature The effect of storage performance

Active Publication Date: 2022-04-12
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The most common method is to increase the voltage of lithium-ion batteries, but all high-voltage cathode materials face a common problem: the decomposition of the electrolyte at high voltage, especially at a higher voltage of 4.5V, conventional electrolyte Oxidation and decomposition on the surface of the positive electrode of the battery are faster, especially under high temperature conditions, which will further accelerate the oxidation and decomposition of the electrolyte, and at the same time promote the deterioration reaction of the positive electrode material

Method used

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  • Additive, non-aqueous electrolyte containing additive and lithium ion battery
  • Additive, non-aqueous electrolyte containing additive and lithium ion battery
  • Additive, non-aqueous electrolyte containing additive and lithium ion battery

Examples

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Embodiment 1

[0037] (1) Preparation of non-aqueous electrolyte

[0038] In an argon-filled glove box (O 2 2 O<1ppm), ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed according to the weight ratio of EC:EMC:DEC=1:1:1 to obtain 86.5 g of non-aqueous organic solvent, then add 1g of compound 1, dissolve and stir thoroughly, then add 12.5g of lithium hexafluorophosphate, and mix well to obtain an electrolyte.

[0039] (2) Preparation of positive electrode

[0040] The nickel-cobalt lithium manganate ternary material LiNi 0.5 co 0.2 mn 0.3 o 2, the binder PVDF and the conductive agent SuperP are mixed uniformly at a mass ratio of 95:1:4 to make a lithium-ion battery positive electrode slurry with a certain viscosity. After the mixed slurry is coated on both sides of the aluminum foil, it is dried and rolled Afterwards, the positive electrode sheet is obtained.

[0041] (3) Preparation of negative electrode

[0042] Prepare artificial graphite,...

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Abstract

The invention discloses an additive, a non-aqueous electrolyte containing the additive and a lithium ion battery. The additive comprises a compound as shown in a structural formula 1, wherein R1-R6 are independently selected from a hydrogen atom, a C1-C10 alkyl group, a C2-C10 alkenyl group, a C2-C10 alkynyl group and a C6-C10 aryl group. The additive can inhibit oxygenolysis of the non-aqueous electrolyte, can improve the high-temperature storage performance and high-temperature cycle performance of the lithium ion battery under a high-voltage (especially 4.5 V) system, and can also improve the low-temperature discharge performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an additive, a nonaqueous electrolytic solution containing the additive, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital, power tools, aerospace, energy storage, power vehicles and other fields due to their advantages such as high specific energy, no memory effect, and long cycle life. The ternary cathode material has become the preferred material for the cathode active material of the lithium-ion battery due to its good safety and low price. [0003] In order to meet the needs of large mobile electrical equipment, the development of lithium-ion batteries with large specific capacity is imminent. The most common method is to increase the voltage of lithium-ion batteries, but all high-voltage cathode materials face a common problem: the decomposition of the electrolyte at high voltage, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10H01M10/0567H01M10/0525
Inventor 黄秋洁欧霜辉白晶张元青陈子勇王霹霹毛冲戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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