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Composite negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery

A negative electrode material and polymer technology, applied in the field of battery materials, can solve the problems of material performance impact, unstable large particles, and graphite layer peeling, and achieve the effects of uniform size, good cycle performance, and increased specific capacity.

Pending Publication Date: 2022-07-26
贝特瑞(江苏)新能源材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing treatment methods for small particle size graphite are generally to wrap smaller graphite particles into larger particle products. The above-mentioned wrapping is generally a physical combination, which makes the large particles behind the coating layer unstable, and the charge and discharge process The exfoliation of the graphite layer will occur in the medium; there are also some chemical treatment methods, but heteroatoms will be introduced, which will affect the performance of the material

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  • Composite negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery
  • Composite negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery
  • Composite negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery

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preparation example Construction

[0080] The present application further proposes a preparation method of the composite negative electrode material, figure 1 For a schematic flowchart of an embodiment of the method for preparing a composite negative electrode material proposed in this application, please refer to figure 1 , the preparation method of composite negative electrode material comprises the following steps:

[0081] S10, sulfonating the graphite to obtain sulfonated graphite.

[0082] In the embodiment of the present application, it is preferable to use graphite tailings for processing. Before preparing the graphite as the negative electrode material for the battery, the graphite needs to be classified to obtain the negative electrode material with the desired particle size range and the graphite tailings with a particle size of less than 2 μm. The embodiments of the present application aim to use graphite tailings with a particle size of less than 2 μm to prepare secondary carbon particles, so as t...

Embodiment 1

[0120] (1) Sulfonation of graphite tailings: 5.0 g of graphite tailings were added to a mixed solution of 5 mL of concentrated sulfuric acid and 100 mL of acetic anhydride, and stirred at 70° C. for 4 h to obtain crude sulfonated graphite tailings.

[0121] The crude sulfonated graphite tailings were repeatedly washed with deionized water until the pH of the cleaning solution was neutral, and then dried in a vacuum drying oven at 60 °C for 24 h.

[0122] (2) Disperse 0.5 g of citric acid in 30 mL of deionized water, stir with a magnetic stirrer for 30 min at 60° C. to obtain a solution; gradually add 0.5 g of the sulfonated graphite tailings prepared in step (1) to the solution, and then add 0.5 g of the sulfonated graphite tailings prepared in step (1). At 60 °C, stir with a magnetic stirrer for 2 h to obtain a mixed solution;

[0123] (3) Add 0.32 g of ethylene glycol (ethylene glycol:citric acid=2:1, mol / mol) to the mixed solution in step (2). Stir at 130 °C for 6 h to obt...

Embodiment 2

[0129] (1) Sulfonation of graphite tailings: Add 1.05 g of graphite tailings to a mixed solution of 5 mL of concentrated sulfuric acid and 100 mL of acetic anhydride, and stir at 70° C. for 4 h to obtain crude sulfonated graphite tailings.

[0130] The crude sulfonated graphite tailings were repeatedly washed with deionized water until the pH of the cleaning solution was neutral, and then dried in a vacuum drying oven at 60 °C for 24 h.

[0131] (2) Disperse 0.5 g of citric acid in 30 mL of deionized water, stir with a magnetic stirrer for 30 min at 60° C. to obtain a solution; gradually add 0.5 g of the sulfonated graphite tailings prepared in step (1) to the solution, and then add 0.5 g of the sulfonated graphite tailings prepared in step (1). At 60 °C, stir with a magnetic stirrer for 2 h to obtain a mixed solution;

[0132] (3) adding glycerol to the mixed solution in step (2) so that the molar ratio of glycerol and citric acid is 1:1, and stirring at 130° C. for 6 hours t...

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Abstract

The invention discloses a composite negative electrode material, a preparation method thereof, a battery negative electrode and a lithium ion battery, and relates to the technical field of battery materials. The composite negative electrode material comprises secondary carbon particles and gamma-MnS loaded on the secondary carbon particles, the secondary carbon particles comprise amorphous carbon and graphite, the particle size of the graphite is less than 2 microns, and the particle size of the secondary carbon particles is 10-50 microns. According to the composite negative electrode material provided by the invention, the particle size of the composite negative electrode material is increased, so that the particle size of the composite negative electrode material is uniform, the doping structure is stable, graphite is not easy to peel off in charge and discharge cycles when the composite negative electrode material is prepared into a battery negative electrode, and in addition, gamma-MnS is loaded on the surfaces of secondary carbon particles, so that the specific capacity of the composite negative electrode material is greatly improved; the contact area between the gamma-MnS and the electrolyte and the conductive substrate is increased, so that the Li < + > ion transmission coefficient is increased, the lithium removal and lithium insertion capabilities of the composite negative electrode material are stronger, the material is not easy to pulverize, and the cycle performance is better.

Description

technical field [0001] The present application relates to the technical field of battery materials, in particular to a composite negative electrode material, a preparation method thereof, a battery negative electrode and a lithium ion battery. Background technique [0002] Graphite as a negative electrode material for secondary rechargeable batteries has the following advantages: 1. Graphite has high electronic conductivity; 2. The layered structure has little volume change before and after lithium intercalation; 3. High capacity; 4. Low potential. During the charging and discharging process, the ion migration path in the small graphite particles of the negative electrode is short, and the diffusion resistance is small, but the blocking effect between the small particles will reduce the liquid phase diffusion rate. On the contrary, although large particles are beneficial to the liquid-phase diffusion of ions, the solid-phase diffusion process of ions in carbon materials beco...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/5815H01M4/628H01M4/625H01M4/136H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021
Inventor 郭道峰程兴旺吴敦勇李守斌
Owner 贝特瑞(江苏)新能源材料有限公司
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