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Preparation method of graphite-containing modified cobalt

A modification and graphite technology, applied in the field of modified graphite preparation, can solve the problems of poor compatibility between natural graphite and electrolyte, exfoliation of graphite layer, low lithium intercalation potential, etc., to improve electrochemical performance, reduce irreversible loss, The effect of improving compatibility

Inactive Publication Date: 2014-03-19
成都兴能新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite, as the current commercial lithium-ion battery anode material, is cheap, thermally stable, and environmentally friendly; however, due to the relatively low lithium intercalation potential of graphite, it is easy to cause the decomposition of the electrolyte and the precipitation of dendrite lithium, causing a series of problems. safe question
Therefore, the basic solution is to use a redox couple with a higher equilibrium potential, making the precipitation of dendritic Li thermodynamically unfavorable.
[0004] Natural graphite is widely used as the negative electrode material of lithium-ion batteries, but the compatibility between natural graphite and electrolyte is poor, and the graphite layer is prone to peeling off during the intercalation / delithiation process, resulting in a decrease in cycle performance, thus limiting the use of pure natural graphite. Application of Ink in Li-ion Batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of cobalt-containing modified graphite, comprising the following steps:

[0017] (1) Co(NO 3 ) 2 The solid is crushed into a powder with a particle size of 5-10 μm;

[0018] (2) Co (NO 3 ) 2 Powder, citric acid and natural graphite are mixed and ground at a mass ratio of 0.01:0.02:1, and mixture A is obtained after pressure molding;

[0019] (3) The mixture A was sintered at 400° C. for 16 hours (sintering was performed under a nitrogen atmosphere) to obtain the cobalt-containing modified graphite.

Embodiment 2

[0021] A preparation method of cobalt-containing modified graphite, comprising the following steps:

[0022] (1) Co(NO 3 ) 2 The solid is crushed into a powder with a particle size of 5-10 μm;

[0023] (2) Co (NO 3 ) 2 Powder, citric acid and natural graphite are mixed and ground at a mass ratio of 0.05:0.05:1, and mixture A is obtained after pressure molding;

[0024] (3) The mixture A was sintered at 500° C. for 12 hours (sintering was performed under a nitrogen atmosphere) to obtain the cobalt-containing modified graphite.

Embodiment 3

[0026] A preparation method of cobalt-containing modified graphite, comprising the following steps:

[0027] (1) Co(NO 3 ) 2 The solid is crushed into a powder with a particle size of 5-10 μm;

[0028] (2) Co (NO 3 ) 2 The powder, citric acid and natural graphite are mixed and ground according to the mass ratio of 0.02:0.03:1, and the mixture A is obtained after pressure molding;

[0029] (3) The mixture A was sintered at 450° C. for 14 hours (sintering was performed under a nitrogen atmosphere) to obtain the cobalt-containing modified graphite.

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Abstract

The invention relates to a preparation method of graphite-containing modified cobalt, which belongs to the chemical cell preparation field. The method comprises the following steps: uniformly mixing Co(NO3)2 powder, citric acid and natural graphite in proportion, then compacting and sintering to obtain the graphite-containing modified cobalt. The modified graphite can be used for the cathode material of lithium battery, the electrochemistry performance of the graphite material is improved, compatibility of electrode and an electrolyte can be increased, and insertion of a solvent is prevented in a subsequent cycle process, so that irreversible loss is reduced; a graphite flake is fixed by an external layer cladding object, and the shedding of a graphite layer is avoided when Li<+> enables repeated de-intercalation to change the graphite volume.

Description

[0001] technical field [0002] The invention belongs to the field of chemical battery preparation, in particular to a method for preparing cobalt-containing modified graphite. Background technique [0003] In recent years, with the exploitation and massive use of oil and natural gas and the development of the automobile industry, the non-renewability of oil and other resources has attracted widespread attention. People are paying more and more attention to issues such as urban air quality and the earth's oil resource crisis, and the voice of protecting the environment and saving energy is rising day by day, prompting people to attach great importance to the development and utilization of new energy. Lithium-ion batteries are considered to be promising new energy sources for hybrid electric vehicles and portable electronic devices due to their long cycle life and high energy density. Graphite, as the current commercial lithium-ion battery anode material, is cheap, thermall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/21
Inventor 王维利范未峰
Owner 成都兴能新材料股份有限公司