Preparation method of lithium ion battery negative electrode and application thereof in lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of difficult control of sulfide structure, unfavorable industrial production, long reaction time, etc., to achieve the benefit of electron transmission, Avoid the use of conductive agents and binders, the effect of high specific surface area

Active Publication Date: 2020-10-02
甘肃省民翔新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN111293300A discloses a zinc-cobalt sulfide/carbon nano negative electrode material and its preparation method, first prepares ZIF-8, then hydrothermally prepares ZIF-8@ZIF-67; mixes it with carbon precursor to prepare ZIF-8@ ZIF-67; the product is calcined with S at high temperature to obtain zinc cobalt sulfide/carbon nano negative electrode material; CN109768233A discloses a lithium ion battery NiCo 2 S 4 /The preparation method of graphene composite negative electrode material, resin is joined in catalyst metal salt solution, and this metal salt solution is the mixture of nickel salt sol

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  • Preparation method of lithium ion battery negative electrode and application thereof in lithium ion battery
  • Preparation method of lithium ion battery negative electrode and application thereof in lithium ion battery

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Embodiment 1

[0019] (1) Prepare silica nanorods first: dissolve CTAB, sodium citrate, and TEOS with a mass ratio of 1:1:1.5 in a mixture of organic solvent propanol and water, then add ammonia water, stir, and add to a hydrothermal kettle , then add carbon cloth as a substrate, and react at 220 degrees Celsius for 3 hours to obtain carbon cloth loaded with silica nanorods;

[0020] (2) Dissolve 0.4 mol of thiourea, 0.2 mol of cobalt chloride, and 0.1 mol of nickel chloride in deionized water successively, and mix ultrasonically to obtain an electrochemical deposition precursor solution, and then add the carbon cloth of step (1) to Among them, at 0.5mA / cm 2 Deposit under constant current conditions for 15 minutes, and grow nickel-cobalt sulfide on the surface of silicon dioxide. After the deposition, the electrode material is alternately washed with deionized water and ethanol for several times, and dried to obtain cobalt-cobalt sulfide-loaded nickel-SiO 2 Carbon cloth of composite materia...

Embodiment 2

[0024] (1) Prepare silica nanorods first: dissolve CTAB, sodium citrate, and TEOS with a mass ratio of 1:1.02:1.5 in a mixture of organic solvent propanol and water, then add ammonia water, stir, and add to a hydrothermal kettle , then add carbon cloth as a substrate, and react at 200 degrees Celsius for 3 hours to obtain carbon cloth loaded with silica nanorods;

[0025] (2) Dissolve 0.4 mol of thiourea, 0.2 mol of cobalt chloride, and 0.1 mol of nickel chloride in deionized water successively, and mix ultrasonically to obtain an electrochemical deposition precursor solution, and then add the carbon cloth of step (1) to Among them, by electrochemical deposition method, at 1mA / cm 2 Deposit under constant current conditions for 15 minutes, and grow nickel-cobalt sulfide on the surface of silicon dioxide. After the deposition, the electrode material is alternately washed with deionized water and ethanol for several times, and dried to obtain cobalt-cobalt sulfide-loaded nickel-S...

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Abstract

The invention relates to a preparation method of a lithium ion battery negative electrode material. The preparation method comprises the following steps of (1) preparing a silicon dioxide nanorod on carbon cloth, (2) growing cobalt nickel sulfide on the surface of silicon dioxide through an electrochemical deposition method, (3) putting the carbon cloth obtained in the step (2) into a NaOH solution to etch SiO2 so as to obtain carbon cloth loaded with hollow nanotube nickel sulfide cobalt, (4) putting the carbon cloth in the step (4) into an HAuCl4 solution, performing ultrasonic treatment, and performing microwave radiation to obtain a hollow tube nickel sulfide cobalt/Au nanoparticle composite material. The preparation process is simple and efficient, and the negative electrode materialhas excellent cycle performance and rate capability when applied to the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of battery technology. Background technique [0002] In recent years, with the rapid development of 3C digital products, energy storage, communications and new energy vehicles, people have increasingly stringent requirements on the performance of lithium-ion batteries. Graphite negative electrodes and silicon electrodes are limited in scope of use due to their own defects. Therefore, it is necessary to provide a new high-capacity and high-cycle negative electrode material to promote the development of lithium-ion battery negative electrode materials. Transition metal sulfides, as novel anode materials, have high specific capacity performance, however, their poor conductivity, large volume change and severe capacity fading during charge-discharge cycles as anodes for rechargeable lithium-ion batteries hinder their Use in rechargeable batteries. Therefore, how to further improve its structure to improve its cycle stab...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/362H01M4/5815H01M4/626H01M4/136H01M4/1397H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 李军
Owner 甘肃省民翔新能源科技有限公司
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