Coating and modifying method for electrode material of lithium ion battery

A technology of lithium-ion batteries and electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as difficulty in industrial mass production, high production costs, and low output, and achieve Reduce lithium consumption, prolong life, and improve flexibility

Inactive Publication Date: 2016-09-07
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the previous research work was mainly to artificially manufacture nano-scale films on the surface of electrode materials to provide materials with certain functions. These methods usually h

Method used

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  • Coating and modifying method for electrode material of lithium ion battery
  • Coating and modifying method for electrode material of lithium ion battery
  • Coating and modifying method for electrode material of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0023] The present embodiment provides a kind of encapsulation modification method of lithium-ion battery electrode material, and it comprises the following steps:

[0024] (a) Dissolve 0.025g of potassium vinyl trifluoroborate in 20ml of deionized water, and stir evenly to form a solution with a concentration of 1.25mg / ml;

[0025] (b) Add 5g of natural graphite to the above solution, use mechanical stirring to completely soak the graphite in the solution, then continuously stir in a water bath at 70°C, evaporate and remove the water, at this time, potassium vinyl trifluoroborate is deposited on the natural stone the surface of the ink;

[0026] (c) placing the product in step (b) in a vacuum oven and drying at 170° C. for 12 hours to remove residual moisture in step (b), while making the coating layer closely contact with the graphite surface;

[0027] The obtained SEM image and EDX image are as follows figure 1 and figure 2 As shown, it can be seen that potassium vinyl ...

Embodiment 2

[0029] This embodiment provides a method for coating and modifying lithium-ion battery electrode materials. In 20ml deionized water, stir evenly to form a solution with a concentration of 2.5mg / ml.

Embodiment 3

[0031] This embodiment provides a method for coating and modifying lithium-ion battery electrode materials. In 20ml deionized water, stir evenly to form a solution with a concentration of 2.0mg / ml.

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Abstract

The invention relates to a coating and modifying method for an electrode material of a lithium ion battery. The coating and modifying method comprises the following steps of (1) dissolving alkylene borofluoride into a solvent to form a solution; (b) adding the electrode material into the solution, heating and evaporating to remove the solvent, and enabling the alkylene borofluoride to be deposited on the surface of the electrode material; and (c) carrying out thermal processing on the product obtained in the step (b) under a vacuum condition or under inert gas protection, wherein the thermal processing is carried out at a temperature of 100-300 DEG C. Therefore, inorganic components are connected and fixed through an organic framework; due to high flexibility of a polymer chain section, a certain degree of expansion and shrinkage of the electrode in the lithium intercalation/deintercalation process can be bearable; the high elasticity and flexibility of the SIE film can be ensured; the lithium consumption in the cyclic process of the electrode can be lowered; and the service life of the battery can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials, and relates to a coating modification method of electrode materials, in particular to a coating modification method of lithium ion battery electrode materials. Background technique [0002] Electrode materials are the most critical and core materials of lithium-ion batteries. Modification of electrode materials is an important means to improve the surface and structural stability of electrode materials and develop high-performance and long-life lithium-ion batteries. [0003] Lithium-ion battery electrode materials (especially graphite negative electrode materials, silicon negative electrode materials, high-voltage positive electrode materials, etc.) will undergo a series of reduction decomposition or oxidation decomposition reactions on the electrode and electrolyte phase interface during the electrochemical intercalation and delithiation process, thereby A layer of solid elec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/505H01M4/525H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/587H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 郑雪莹谭啸石强朱国斌曲群婷
Owner HOHAI UNIV
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