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Preparation method of nitrogen-doped graphene coated SiC nanoparticle lithium ion battery negative electrode material

A technology of nitrogen-doped graphene and lithium-ion batteries, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem that the shape and size cannot fundamentally change the slow kinetic process of electrode materials, and the lithium-ion battery rate Reduced performance and cycle life, etc., to achieve the effect of simple preparation steps and good electrolyte wettability

Inactive Publication Date: 2020-12-08
DONGGUAN UNIV OF TECH
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Problems solved by technology

However, since the charging and discharging process involves the transfer of multiple electrons and multiple ions, the regulation of morphology and size cannot fundamentally change the slow kinetic process of the electrode material itself, which leads to a significant decrease in the rate performance and cycle life of lithium-ion batteries.

Method used

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  • Preparation method of nitrogen-doped graphene coated SiC nanoparticle lithium ion battery negative electrode material
  • Preparation method of nitrogen-doped graphene coated SiC nanoparticle lithium ion battery negative electrode material
  • Preparation method of nitrogen-doped graphene coated SiC nanoparticle lithium ion battery negative electrode material

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Embodiment Construction

[0029] 1. The equipment required for the preparation of nitrogen-doped graphene-coated SiC nanoparticles

[0030] Single temperature zone horizontal high temperature tube furnace and corundum boat.

[0031] 2. Reagents required for the preparation of nitrogen-doped graphene-coated SiC nanoparticles

[0032] SiC nanoparticles with a diameter of 100–300 nm and ammonia gas.

[0033] 3. Preparation process of nitrogen-doped graphene-coated SiC nanoparticles

[0034] In an ammonia atmosphere, the SiC nanoparticles are heated for a predetermined time, and cooled to obtain nitrogen-doped graphene-coated SiC nanoparticles.

[0035] Preferably, the preparation method of nitrogen-doped graphene-coated SiC nanoparticles comprises the steps of:

[0036] S1. Weigh a certain mass of SiC nanoparticles and place them in a container, and place the container containing a certain mass of SiC nanoparticles in a heating system;

[0037] S2. Evacuate the air in the heating system, and then feed...

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Abstract

The invention provides a preparation method of a nitrogen-doped graphene coated SiC nanoparticle lithium ion battery negative electrode material. The method comprises the following steps: in an ammonia atmosphere, heating SiC nanoparticles to a predetermined time, and cooling to obtain nitrogen-doped graphene coated SiC nanoparticles. The prepared nitrogen-doped graphene coated SiC nanoparticles can significantly improve the electrochemical performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of novel lithium-ion battery negative electrode materials, in particular to a method for developing a nitrogen-doped graphene-coated SiC nanoparticle lithium-ion battery negative electrode material. Background technique [0002] The current commercial lithium-ion battery system usually uses graphite as the negative electrode material and lithium nickel manganese cobalt oxide (NMC) as the positive electrode material. Among them, the theoretical mass specific capacity of the graphite negative electrode is 370 mAh g −1 (unlithiated), with a crystal density of 2.266 g cm −3 , with a volume specific capacity of 841 mAh cm −3 (unlithiated) or 719 mAh cm −3 lithiation). Therefore, when matched with commercial cathode materials, graphite can account for 55-60% of the total battery volume. In addition, there is a problem of lithium dendrites in graphite anodes at high magnifications, which seriously restricts th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10H01M4/386H01M4/366H01M4/139
Inventor 王严杰孙长龙崔立峰刘丹
Owner DONGGUAN UNIV OF TECH
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