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Three-dimensional Co3Sn2/SnO2 anode material for lithium ion batteries and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as long process time, and achieve the effects of improving electrical conductivity, improving electrochemical performance, and improving reversibility

Active Publication Date: 2019-02-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process time of this method is long, and the problem of volume expansion after the cycle cannot be effectively solved

Method used

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  • Three-dimensional Co3Sn2/SnO2 anode material for lithium ion batteries and preparation method thereof
  • Three-dimensional Co3Sn2/SnO2 anode material for lithium ion batteries and preparation method thereof
  • Three-dimensional Co3Sn2/SnO2 anode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A three-dimensional Co for lithium-ion batteries 3 sn 2 / SnO 2 A method for preparing a composite negative electrode material, comprising the steps of:

[0040] S1. Clean the nickel foam with an average pore diameter of 200 μm with concentrated hydrochloric acid to remove the oxide layer and organic substances, then ultrasonically clean it with deionized water and absolute ethanol for 4 minutes, and dry at 65°C to obtain pretreated nickel foam;

[0041] S2. The tin-containing precursor is prepared by the following process: dissolve tin chloride pentahydrate in deionized water, then add citric acid, the mass ratio of tin chloride pentahydrate to citric acid is 3:1.22, heat in a water bath to 55°C, Then add ammonia water with a concentration of 0.6mol / L dropwise, then adjust the pH value to 1-2, let stand and age for 11 hours, filter, clean the filter cake, add saturated oxalic acid solution until the filter cake is dissolved;

[0042] The cobalt-containing precursor i...

Embodiment 2

[0046] A three-dimensional Co for lithium-ion batteries 3 sn 2 / SnO 2 A method for preparing a composite negative electrode material, comprising the steps of:

[0047] S1. Wash the zinc foam with an average pore diameter of 200 μm with concentrated hydrochloric acid to remove the oxide layer and organic substances, then ultrasonically clean it with deionized water and absolute ethanol for 6 minutes, and dry at 55°C to obtain pretreated zinc foam;

[0048] S2. The tin-containing precursor is prepared by the following process: dissolve tin chloride pentahydrate in deionized water, then add citric acid, the mass ratio of tin chloride pentahydrate to citric acid is 5:0.60, heat in a water bath to 65°C, Then add ammonia water with a concentration of 0.2mol / L dropwise, then adjust the pH value to 1-2, let stand and age for 13h, filter, clean the filter cake, add saturated oxalic acid solution until the filter cake is dissolved;

[0049] The cobalt-containing precursor is prepared...

Embodiment 3

[0053] A three-dimensional Co for lithium-ion batteries 3 sn 2 / SnO 2 A method for preparing a composite negative electrode material, comprising the steps of:

[0054] S1. Wash the copper foam with an average pore diameter of 200 μm with concentrated hydrochloric acid to remove the oxide layer and organic substances, then ultrasonically clean it with deionized water and absolute ethanol for 4.5 minutes, and dry at 62°C to obtain pretreated copper foam;

[0055] S2. The tin-containing precursor is prepared by the following process: dissolve tin chloride pentahydrate in deionized water, then add citric acid, the mass ratio of tin chloride pentahydrate to citric acid is 3.5:1, heat in a water bath to 58°C, Then add ammonia water with a concentration of 0.5mol / L dropwise, then adjust the pH value to 1-2, let stand and age for 11.5h, filter, clean the filter cake, add saturated oxalic acid solution until the filter cake is dissolved;

[0056] The cobalt-containing precursor is p...

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Abstract

The invention relates to the field of anode materials for lithium ion batteries, and relates to a three-dimensional Co3Sn2 / SnO2 composite anode material for lithium ion batteries and a preparation method thereof. The method mainly includes two key preparation parts of a cobalt / tin precursor part and solidification sintering part, that is, foam metal is used as a template to perform mixed infiltration of the cobalt / tin precursor and low temperature curing and high temperature sintering to obtain the three-dimensional Co3Sn2 / SnO2 composite anode material for lithium ion batteries. The anode material herein has a unique three-dimensional structure, and not only provides a fast transmission channel for lithium ions and electrons through the porous structure, but also has a copper matrix with high conductivity and embedded Co nanoparticles, thereby gaining improved overall conductivity. The operation process herein is simple, and the cost is low. No conductive agent or additive is requiredfor assembling the batteries.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a three-dimensional Co 3 sn 2 / SnO 2 Composite negative electrode material and preparation method thereof. Background technique [0002] Foam metal refers to special metal materials containing foam pores. Through its unique structural characteristics, metal foam has a series of good advantages such as low density, good heat insulation performance, good sound insulation performance, and the ability to absorb electromagnetic waves. It is a new type of material that has gradually developed with human science and technology. A series of industrial development such as chemical industry. The porosity of metal foam often reaches more than 90%, and it is a porous metal with certain strength and rigidity. This kind of metal has high porosity, and the pore diameter can reach millimeter level. Its air permeability is very high, almost all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/66H01M4/80H01M10/0525
CPCH01M4/364H01M4/485H01M4/58H01M4/661H01M4/808H01M10/0525H01M2004/027Y02E60/10
Inventor 毕超奇谢李昭杨立铭谢李生王辉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY