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Lithium ion secondary battery and electrolyte thereof

A secondary battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as capacity decay and flatulence, and achieve the effects of inhibiting reaction, inhibiting dissolution, and improving high-temperature storage performance

Inactive Publication Date: 2016-07-20
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: provide an electrolyte that can improve the high-temperature storage performance of the battery, and use the electrolyte to manufacture a lithium-ion secondary battery with better high-temperature storage performance, so as to solve the long-term storage process of the battery at room temperature or high temperature Volume fade and flatulence problems caused by

Method used

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  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of the electrolyte: mix ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) uniformly in a mass ratio of 30:50:20 to obtain a non-aqueous organic solvent; use LiPF 6 Lithium salt and lithium 1,1,1,3,3,3-hexafluoro-2-propoxide are used as additives to prepare an electrolyte, and the LiPF in the prepared electrolyte 6 The concentration is 1 mol / L, and the concentration of lithium 1,1,1,3,3,3-hexafluoro-2-propoxide is 1 wt%.

[0028] Preparation of lithium-ion secondary battery:

[0029] 1) Preparation of the positive electrode sheet: the positive electrode active material nickel cobalt lithium manganese oxide (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), the conductive agent Super-P, and the binder PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2.0:2.0, and mixed evenly to make a positive electrode slurry; then the positive electrode slurry is evenly coated on the current collector aluminum foil On, the coating...

Embodiment 2

[0034] The lithium ion secondary battery was prepared according to the method of Example 1, except that when the electrolyte was prepared, the additive was changed to 1,1,1,3,3,3-hexafluoro-2- lithium propoxide.

Embodiment 3

[0036] Lithium-ion secondary batteries were prepared according to the method of Example 1, except that when the electrolyte was prepared, the additive was changed to 1,1,1,3,3,3-hexafluoro-2- lithium propoxide.

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Abstract

The invention discloses a lithium ion secondary battery and electrolyte thereof. The electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, wherein the lithium salt is dissolved in the non-aqueous organic solvent; the additive comprises a first additive; the first additive is a perfluoroalkyl lithium alkoxide compound shown in formula (1), the mass content in the electrolyte is 0.01%-5%, (formula), in the formula (1), R1 and R2 are respectively independently selected from perfluoroalkyl group CnF2n+1 with 1-4 carbon atoms, and n is equal to 1-4. The lithium ion secondary battery is a battery adopting the electrolyte. In comparison with the prior art, through adding a certain amount of perfluoroalkyl lithium alkoxide compound having a structure similar to a fluoroalkyl phosphate compound into the electrolyte of the lithium ion secondary battery as the first additive, the high-temperature storage performance of the lithium ion secondary battery is effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and more specifically, the invention relates to a lithium-ion secondary battery with good high-temperature storage performance and an electrolyte thereof. Background technique [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they have been used in mobile phones. , notebook computers, camcorders, digital cameras, tablet computers and other portable electronic products that emphasize lightness, shortness, and multi-function are rapidly gaining popularity. [0003] In recent years, with the depletion of global petroleum energy and the development of new energy technologies, the lithium-ion battery technology used in automobile power has developed rapidly....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/056
CPCY02E60/10
Inventor 冯绍伟韩昌隆付成华
Owner CONTEMPORARY AMPEREX TECH CO