Modification method and composite material of natural graphite negative electrode material

A technology of natural graphite and negative electrode material, applied in battery electrodes, electrical components, electrochemical generators, etc., to prevent shedding, easy control, and strong lithium storage capacity

Active Publication Date: 2016-09-14
中建材黑龙江石墨新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for modifying natural graphite negative electrode materials and composite materials. The technical problem to be solved is to improve the high-rate charge-discharge performance and low-temperature performance of natural graphite negative electrode materials, reduce preparation costs, and reduce environmental pollution.

Method used

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  • Modification method and composite material of natural graphite negative electrode material
  • Modification method and composite material of natural graphite negative electrode material
  • Modification method and composite material of natural graphite negative electrode material

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Embodiment 1

[0060] 1. Take 500g of natural graphite with a carbon content of 99%, a particle size D50 of 8.0 μm, and 1750g of formic acid solution electrolyte with a mass fraction of 60%, and the current density between the anode and the cathode is 10mA / cm 2 , electrolytically oxidize natural graphite for 4.0 hours to increase the distance between graphite layers to 0.4-0.7nm, wash with distilled water to a pH value of 6.5, filter, and dry at 60°C to obtain graphite oxide.

[0061] 2. Graphite oxide is prepared into a graphite oxide aqueous solution with a mass content of 30%, adding tin acetate and cobalt acetate with a molar concentration of metal ions of 0.1mol / L can intercalate mixed metal ion solutions, and the addition is 3% of the volume of the graphite oxide aqueous solution times, the frequency is 5.0KHz, and the power density is 0.30w / cm 2 , and ultrasonically dispersed for 60 minutes to obtain a mixed solution of graphite oxide metal ions.

[0062] 3. The nitrogen flow rate is...

Embodiment 2

[0068] 1. Take 500g of natural graphite with a carbon content of 99%, a particle diameter D50 of 11.0 μm, and 1900g of acetic acid solution electrolyte with a mass fraction of 56%. The current density between the anode and the cathode is 15mA / cm 2 , electrolytically oxidize natural graphite for 3.5 hours to increase the distance between graphite layers to 0.4-0.7nm, wash with distilled water to a pH value of 6.5, filter, and dry at 60°C to obtain graphite oxide.

[0069] 2. Graphite oxide is formulated into a graphite oxide aqueous solution with a mass content of 38%, and the molar concentration of metal ions added is 0.28mol / L tin acetate and nickel acetate intercalation mixed metal ion solution, and the addition is 3% of the volume of the graphite oxide aqueous solution times, the frequency is 4.2KHz, and the power density is 0.30w / cm 2 , and ultrasonically dispersed for 53 minutes to obtain a mixed solution of graphite oxide metal ions.

[0070] 3. The nitrogen flow rate i...

Embodiment 3

[0076] 1. Weigh 500g of natural graphite with a carbon content of 99%, a particle diameter D50 of 14.0 μm, and 2050g of phosphoric acid solution electrolyte with a mass fraction of 50%. The current density between the anode and the cathode is 20mA / cm 2 , electrolytically oxidize natural graphite for 3.0 hours to increase the distance between graphite layers to 0.4-0.7nm, wash with distilled water to a pH value of 6.5, filter, and dry at 60°C to obtain graphite oxide.

[0077] Two, the graphite oxide is formulated into a graphite oxide aqueous solution with a mass content of 46%, and the molar concentration of adding metal ions is 0.46mol / L tin sulfate and manganese sulfate intercalation mixed metal ion solution, and the addition is 3% of the volume of the graphite oxide aqueous solution times, the frequency is 3.4KHz, and the power density is 0.37w / cm 2 , and ultrasonically dispersed for 46 minutes to obtain a mixed solution of graphite oxide metal ions.

[0078] 3. The flow ...

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Abstract

The invention discloses a natural graphite negative electrode material modification method and a composite material and aims at improving high-rate charge-discharge ability and low-temperature performance of the natural graphite negative electrode material, lowering preparation cost and reducing environmental pollution. The natural graphite negative electrode material modification method comprises the steps of carrying out electrolytic oxidation, inserting metal ions, reducing, carrying out pyrolysis, coating and sintering. The natural graphite negative electrode material modification method disclosed by the invention has the advantages that a carbon coating layer coats a graphite matrix, and metal and alloy in nano scale range are distributed in the interlayer of the graphite matrix. Compared with the prior art, the modification method has the advantages that electron conductivity of natural graphite in c axis direction is increased, high-rate discharge ability and low-temperature performance of the negative electrode material are improved, the nano metal and ally have strong lithium storage capability, specific discharge capacity of the material is improved, the coating layer can be used for effectively improving graphite layer corrosion caused by electrolyte, graphite sheet falling is prevented, cycling performance of the material is improved, and the preparation method is simple, easy to control, low in cost and easy for industrial production.

Description

technical field [0001] The invention relates to a preparation method and material of a new energy material, in particular to a preparation method and material of a lithium-ion battery composite negative electrode material. Background technique [0002] Graphite is one of the important negative electrode materials for lithium-ion batteries. As an important strategic resource, it is called "industrial monosodium glutamate" together with rare earth elements. Among them, my country's natural graphite accounts for more than 70% of the world's reserves, and is the largest supplier in the international market. Natural graphite is used as the negative electrode material of lithium-ion batteries. It has poor compatibility with organic electrolytes, and graphite flakes are prone to peeling off during charging and discharging, which affects the high-current charging and discharging performance and cycle life. At home and abroad, the research on natural graphite anode materials mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/139H01M4/362H01M10/0525Y02E60/10
Inventor 王兴蔚张勇惠国栋孙永林王北平
Owner 中建材黑龙江石墨新材料有限公司
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