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A kind of composite negative electrode material and its preparation method and application

A technology of negative electrode material and mixed solution, which is applied in the field of composite negative electrode material and its preparation, can solve the problems of complex synthesis process, non-uniform performance, expansion and pulverization, etc., so as to relieve volume expansion, improve utilization rate, and improve electronic conductivity. Effect

Active Publication Date: 2021-09-21
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a composite negative electrode material and its preparation method and application, aiming at solving the problem of insufficient conductivity, uneven performance, easy agglomeration, Expansion and pulverization problems, as well as complex synthesis processes

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  • A kind of composite negative electrode material and its preparation method and application
  • A kind of composite negative electrode material and its preparation method and application
  • A kind of composite negative electrode material and its preparation method and application

Examples

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Embodiment 1

[0049] A preparation method of a composite negative electrode material, comprising the following steps:

[0050] 1. Add 1 g of SiO with a diameter of 200 nm 2 The spheres were dispersed in 5 ml deionized water to form a suspension for later use;

[0051] 2. Mix glucose, thioacetamide, and ammonium molybdate in deionized water, add the suspension and continue mixing to obtain a mixed solution; the concentration of glucose is 0.2 g ml -1 , the concentration of ammonium molybdate solution is 0.0075 mol L -1 , the mass ratio of added thioacetamide to ammonium molybdate is 1:3. The preparation method of the molybdenum disulfide-based lithium ion battery negative electrode material with high cycle stability and high specific capacity, wherein the mass of ammonium molybdate is 150 mg, and the aging temperature is 80°C. High-temperature carbonization was carried out under nitrogen protection at a temperature of 900 °C and a holding time of 2 h. Template removal after calcination, ...

Embodiment 2

[0054] A preparation method of a composite negative electrode material, comprising the following steps:

[0055] 1. Add 1 g of SiO with a diameter of 150 nm 2 The spheres were dispersed in 5 ml of deionized water to form a suspension for later use.

[0056] 2. Mix glucose, thioacetamide, and ammonium molybdate in deionized water, add the suspension and continue mixing to obtain a mixed solution; the concentration of glucose is 0.2 g ml -1 , the concentration of ammonium molybdate solution is 0.0075 mol L -1 , the mass ratio of added thioacetamide to ammonium molybdate is 1:3. The preparation method of the molybdenum disulfide-based lithium ion battery negative electrode material with high cycle stability and high specific capacity, wherein the mass of ammonium molybdate is 150 mg, and the aging temperature is 80°C. High-temperature carbonization was carried out under nitrogen protection at a temperature of 1000 °C and a holding time of 1 h. Template removal after calcinati...

Embodiment 3

[0058] A preparation method of a composite negative electrode material, comprising the following steps:

[0059] 1. Add 1.5 g of SiO with a diameter of 100 nm 2 The spheres were dispersed in 5 ml of deionized water to form a suspension for later use.

[0060] 2. Mix glucose, thioacetamide, and ammonium molybdate in deionized water, add the suspension and continue mixing to obtain a mixed solution; the concentration of glucose is 0.2 g ml -1 , the concentration of ammonium molybdate solution is 0.0075 mol L -1 , the mass ratio of added thioacetamide to ammonium molybdate is 1:2. The preparation method of the molybdenum disulfide-based lithium ion battery negative electrode material with high cycle stability and high specific capacity, wherein the mass of ammonium molybdate is 150 mg, and the aging temperature is 80°C. High-temperature carbonization was carried out under nitrogen protection at a temperature of 900 °C and a holding time of 1.5 h. Template removal after calcin...

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Abstract

The invention discloses a composite negative electrode material and its preparation method and application. The method comprises the steps of: mixing glucose, thioacetamide, ammonium molybdate and nano silicon dioxide in deionized water to obtain a mixed solution; Under the following conditions, the mixed solution is subjected to aging treatment to obtain a composite negative electrode material precursor; under the second temperature condition, the composite negative electrode material precursor is subjected to carbonization treatment, and hydrofluoric acid is used to treat the carbonized composite negative electrode material precursor. The body is etched to obtain the composite negative electrode material. MoS in the composite negative electrode material of the present invention 2 The nanosheets provide abundant active sites, which can provide abundant edges for lithium ion storage, thereby significantly improving the cycle stability and specific capacity; the hierarchical porous framework not only facilitates the transport of ions, but also improves the electronic conductivity; the carbon layer also Effectively alleviating volume expansion, these structural features enhance surface reaction kinetics and facilitate charge transport.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrode materials, in particular to a composite negative electrode material and a preparation method and application thereof. Background technique [0002] Over the past few decades, the fossil fuel-based energy economy has faced serious risks, urgently requiring the development of new energy storage and conversion technologies. Lithium-ion batteries (LIBs) are considered as important energy storage devices. However, the low theoretical capacity of current commercial graphite anodes hinders the further large-scale application of next-generation lithium-ion batteries. [0003] Transition metal dichalcogenides (TMDs) have attracted great attention as anodes for LIBs due to their high theoretical specific capacities. In addition, the weak M–S ionic bond may favor the reaction kinetics, thereby enhancing the lithium storage capacity. A typical two-dimensional (2D) layered molybdenum disulfide (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 任祥忠陈焕辉李永亮石钏
Owner SHENZHEN UNIV