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Method for preparing graphitic carbon nanometer tube combination electrode material for lithium ion battery

A nanotube composite, lithium-ion battery technology, applied in the field of graphite electrode material preparation, can solve the problems of reduced electrode life, poor solvent compatibility, poor high current performance, etc., and achieve stable specific capacity, high specific capacity and long life. Effect

Inactive Publication Date: 2009-01-28
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite, as the negative electrode material of lithium-ion batteries, currently exists in the process of use: poor compatibility with solvents, poor high-current performance, the graphite layer peels off due to the co-embedding of solvent molecules during the first charge and discharge, and the life of the electrode is reduced

Method used

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  • Method for preparing graphitic carbon nanometer tube combination electrode material for lithium ion battery
  • Method for preparing graphitic carbon nanometer tube combination electrode material for lithium ion battery
  • Method for preparing graphitic carbon nanometer tube combination electrode material for lithium ion battery

Examples

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Effect test

Embodiment 1

[0027] (1) Weigh a certain amount of Co, Ni, or Mo nitrate (catalyst) (according to the mass ratio of the catalyst and its support from 5% to 40%) to prepare a 50ml solution;

[0028] (2) Mix the corresponding amount of catalyst support graphite into the solution (1), heat it in a water bath at 90°C, and keep stirring until the solution is evaporated;

[0029] (3) Put the solid obtained in (2) into an oven at 80°C for 12 hours, then put N 2 Calcinate in a gas-protected muffle furnace at 500°C for 10 hours, take it out, grind it into powder, and put it in a desiccator for later use;

[0030] (4) Put the prepared catalyst precursor into a fixed bed-mobile gas phase device (WFSM-3011 type), at a gas flow rate of 40ml / min (Ar:H 2 =1:1; Ar is carrier gas, H 2 The temperature is linearly increased from room temperature to 500°C under the atmosphere of reducing gas, and the temperature is maintained for 60 minutes to ensure that the catalyst precursors are all reduced to active catalysts...

Embodiment 2

[0034] The main steps for the preparation of single-layer graphite in-situ modification (multilayer) graphite carbon nanotube composite electrode material:

[0035] (1) When graphite is immersed in concentrated sulfuric acid or concentrated nitric acid to oxidize, a large number of functional groups will appear between the graphite layered structures, the interaction between the graphite layers and the layers will be significantly reduced, and the graphite multilayer structure will be partially converted into single Layer structure, and then reduce the graphite oxide to obtain a composite electrode material of single-layer graphite in-situ modified (multilayer) graphite;

[0036] (2) Growing carbon nanotubes in situ on the material prepared in (1) (same as Example 1) to obtain a single-layer graphite (Graphene) in-situ modified (multilayer) graphite carbon nanotube composite electrode material.

Embodiment 3

[0038] The main steps of preparing single-layer graphite modified (multi-layer) graphite carbon nanotube composite electrode material:

[0039] (1) Heat the graphite to 100-300°C and quickly immerse it in concentrated sulfuric acid or concentrated nitric acid solution below 10°C, add a surfactant (such as SDS) and ultrasonic vibration to fully oxidize and separate the graphite, and then reduce the product to form High-yield single-layer graphite, such as figure 2 (a) shown;

[0040](2) Perform chemical etching or mechanical ball milling on the prepared single-layer graphite oxide, so that many nano-scale micropores appear in the single-layer graphite, which further increases the specific surface area of ​​the single-layer graphite and facilitates the insertion and insertion of lithium ions. De-embedding, such as figure 2 (b) Shown;

[0041] (3) Mix the prepared pure and pretreated single-layer graphite with (multilayer) graphite thoroughly and uniformly, and then grow carbon nan...

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Abstract

The invention discloses a method for preparing a carbon nanotube composite electrode material by modifying graphite electrodes through a carbon nanotube and a single layer of graphite. The method comprises the following steps: (1) a precursor of a catalyst is prepared by an immersion method, and then is reduced to obtain a catalyst; (2) ethanol is cracked on the cracked catalyst and the cabon nanotube is grown in-situ; and (3) the product is mixed with acetylene black and a bonding agent to obtain a graphite carbon nanotube composite electrode material. The method allows the carbon nanotube to be grown on the surface of the graphite in situ, rather than takes the carbon nanotube as an addictive to be mixed in the graphite. The modifying method ensures that the carbon nanotube and the graphite are combined more closely and evenly microcosmically.

Description

Technical field [0001] The invention relates to the technical field of preparation of graphite electrode materials for lithium ion batteries, and specifically to a method for modifying graphite electrodes by using carbon nanotubes and single-layer graphite. Background technique [0002] Lithium-ion batteries are the latest generation of green high-energy rechargeable batteries, and are considered a high-tech industry of great significance to the national economy and people’s lives in the 21st century. However, with the development of battery miniaturization, the development of batteries with high specific capacity and high cycle times has become more and more urgent. Graphite, as a negative electrode material for lithium ion batteries, currently exists in the process of use: poor compatibility with solvents and poor high-current performance. The graphite layer is peeled off due to the co-intercalation of solvent molecules during the first charge and discharge, and the electrode l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36
CPCY02E60/10
Inventor 王惠任兆玉李渭龙王小芳董发昕
Owner NORTHWEST UNIV(CN)
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