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A kind of modification method of lithium ion battery graphite negative electrode material

A technology for lithium-ion batteries and graphite negative electrodes, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant effect, low output, high cost, etc., to ensure long-term cycle stability, improve the first Coulombic efficiency, reduce The effect of irreversible capacity

Active Publication Date: 2017-09-05
JIANGSU DAOYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many inorganic coating methods (such as magnetron sputtering, atomic layer deposition, electrolysis, etc.) have problems of high cost and low yield, which are difficult to be used in industrial mass production
Direct inorganic salt coating, less research, and the effect is not obvious

Method used

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  • A kind of modification method of lithium ion battery graphite negative electrode material
  • A kind of modification method of lithium ion battery graphite negative electrode material
  • A kind of modification method of lithium ion battery graphite negative electrode material

Examples

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Effect test

Embodiment 1

[0026] The present embodiment provides a kind of modification method of lithium-ion battery graphite negative electrode material, and it comprises the following steps:

[0027] (a) Dissolve 0.0152g of maleic acid in 10ml of deionized water, drop into the prepared sodium hydroxide solution until the pH of the solution is 7, the mass of sodium maleate at this time is 0.02g, and then add 2g to the solution Natural graphite and the graphite is completely soaked in the solution by magnetic stirring, and the container used is a 25ml beaker;

[0028] (b) Place the beaker described in step (a) in a water bath under temperature control at 60°C, and continuously stir the mixture in the beaker until dry;

[0029] (c) Place the product in step (b) in a blast drying oven at 60°C for 24 hours to remove residual moisture in step (b).

Embodiment 2

[0031] This embodiment provides a modification method of graphite negative electrode material for lithium ion battery, the preparation process is basically the same as that in Example 1, the difference is that 0.0304g of maleic acid is used to prepare the solution, so that the quality of maleate is graphite 2% of the mass.

Embodiment 3

[0033] This embodiment provides a method for modifying graphite negative electrode materials for lithium ion batteries. The preparation process is basically the same as in Example 1. The difference is that 0.0456g of maleic acid is used to prepare a solution so that the quality of the maleate is graphite. 3% of the mass; the obtained lithium-ion battery graphite anode material EDAX figure is as follows Figure 2 to Figure 4 (in, figure 2 EDAX image for the C element, image 3 is the EDAX image of the O element, Figure 4 EDAX image of Na element), SEM (scanning electron microscope) picture as figure 1 As shown, the TEM (transmission electron microscope) image is shown in Figure 6 shown (in addition, Figure 5 TEM image of uncoated graphite).

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Abstract

The invention relates to a modification method for a lithium-ion battery graphite cathode material. The method comprises the following steps that a, graphite and a maleate water solution are mixed to obtain a mixed solution; b, the mixed solution is heated to be dry on the constant-stirring condition. Due to the existence of a wrapping layer, the effect of an artificial SEI membrane is achieved, the reversible capacity of the material is effectively lowered, and the first-time coulombic efficiency of a lithium-ion battery is improved. In addition, the wrapping layer can be better attached to the surface of the graphite, cointercalation of solvation lithium ions can be resisted to a certain extent, the effect of the SEI membrane is achieved, and the stability of a graphite structure is protected; in addition, lithium consumption can be resisted in the electrode cyclic process, and therefore long-term cyclic stability of the graphite material is better protected.

Description

technical field [0001] The invention belongs to the field of negative electrode materials of lithium batteries, and relates to a preparation method of graphite materials, in particular to a modification method of graphite negative electrode materials of lithium ion batteries. Background technique [0002] The modification of negative electrode materials is an important way to improve the performance and stability of lithium-ion batteries. Graphite, as an anode material for lithium-ion batteries, has many advantages. The cost of graphite is low, the specific capacity is relatively high, and the harm to the environment is relatively small. However, graphite materials also have certain problems. How to suppress the redundant side reactions in the battery cycle and how to maintain the integrity of the graphite material structure are the key points of graphite material modification. [0003] In the electrochemical cycle of graphite negative electrode materials, a series of reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 石强朱国斌曲群婷郑洪河
Owner JIANGSU DAOYING TECH CO LTD
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