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High-stability lithium ion battery electrolyte as well as preparation method and application thereof

A lithium-ion battery, high stability technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor cycle performance, increased polarization, and reduced lithium ion diffusion, and achieve improved and stable cycle performance Diffusion of lithium ions, the effect of slowing down the decline in cycle performance

Active Publication Date: 2018-02-23
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, when the voltage is over-discharged to 0V, the interface resistance of lithium titanate increases, the diffusion of lithium ions decreases, and the polarization increases, which eventually leads to poor cycle performance.

Method used

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  • High-stability lithium ion battery electrolyte as well as preparation method and application thereof
  • High-stability lithium ion battery electrolyte as well as preparation method and application thereof
  • High-stability lithium ion battery electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and water;

[0031] (2) Dissolve the conductive lithium salt LiTFSI in the solvent obtained in step (1) at room temperature, with a final concentration of 1.0mol / L, and stir evenly to obtain a standard electrolyte;

[0032] (3) The standard electrolyte configuration prepared in step (2) contains Mn[(TFSI)] of 0.3mol / L 2 , to obtain a stable electrolyte for lithium-ion batteries.

Embodiment 2

[0034] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and water;

[0035] (2) Dissolve the conductive lithium salt LiTFSI in the solvent obtained in step (1) at room temperature, with a final concentration of 1.0mol / L, and stir evenly to obtain a standard electrolyte;

[0036] (3) The standard electrolyte configuration prepared in step (2) contains Mn[(TFSI)] of 0.15mol / L 2 , to obtain a stable electrolyte for lithium-ion batteries.

Embodiment 3

[0038] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and water;

[0039] (2) Dissolve the conductive lithium salt LiTFSI in the solvent obtained in step (1) at room temperature to a final concentration of 1.3 mol / L, and stir evenly to obtain a lithium-ion battery electrolyte.

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Abstract

The invention discloses high-stability lithium ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of a lithium ion battery. The electrolyte is prepared from conductive lithium salt, an organic solvent and a Mn(II) ion stabilizer, wherein the Mn(II) ion stabilizer is Mn[(CF3SO2)2N]2. The Mn(II) ion stabilizer can be deposited on the surface of a cathode SEI film in the charging and discharging processes; a modification effect is achieved in a position near the lithium titanate surface; the lithium ion diffusion is stabilized, so that the reduction of the cycle performance is effectively retarded. The cycle performance of the lithium ion battery containing an electrolyte stabilizer at 0.005 to 2.5V is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-stability lithium-ion battery electrolyte and a preparation method and application thereof. Background technique [0002] In commercial secondary batteries, lithium-ion batteries have the characteristics of high energy density, high output voltage, long cycle life, small self-discharge and no memory effect. Because of the diversity of electrode materials, they are widely used in mobile phones, portable notebooks, It is widely used in electronic equipment such as electric vehicle industry. [0003] At present, the anode materials of commercial lithium-ion batteries are mainly graphite and lithium titanate. In the application of flexible wearable devices, fast charge and fast discharge conditions, the application of graphite is subject to some restrictions. Lithium titanate has the characteristics of high rate and excellent flexibility, and has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0569
CPCH01M10/0525H01M10/0566H01M10/0569Y02E60/10
Inventor 邢丽丹蓝广源李伟善廖友好许梦清
Owner SOUTH CHINA NORMAL UNIVERSITY
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