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Preparation method for nano-granular Mn3O4/Super P lithium ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsuitability for large-scale industrial production and complex preparation process of carbon quantum dots, achieve good cycle stability, improve electrical Chemical properties, high capacity effects

Inactive Publication Date: 2016-05-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle stability of the product prepared by this method has been improved, but the preparation process of carbon quantum dots is still relatively complicated, which is not suitable for large-scale industrial production.

Method used

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  • Preparation method for nano-granular Mn3O4/Super P lithium ion battery negative electrode material
  • Preparation method for nano-granular Mn3O4/Super P lithium ion battery negative electrode material
  • Preparation method for nano-granular Mn3O4/Super P lithium ion battery negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Potassium permanganate and manganese chloride tetrahydrate were added into water respectively according to the ratio of substances of 2:3 to prepare a potassium permanganate solution of 1.25% and a solution of manganese chloride tetrahydrate of 2.25% by mass fraction, and Mix, stir magnetically at room temperature, and filter to obtain manganese dioxide precipitation;

[0023] 2) washing the manganese dioxide precipitate with deionized water until the washing liquid is neutral and drying to obtain manganese dioxide powder;

[0024] 3) Mix manganese dioxide powder and SuperP uniformly in a mass ratio of 3:1 to obtain a mixed material;

[0025] 4) heat-treating the mixed material at 400° C. for 5 h in an argon atmosphere to obtain a solid battery negative electrode material.

Embodiment 2

[0027] 1) Potassium permanganate and manganese chloride tetrahydrate were added into water according to the ratio of substances of 2:3 to prepare potassium permanganate solution of 2.5% and manganese chloride tetrahydrate solution of 4% by mass fraction, and Mix, stir magnetically at room temperature, and filter to obtain manganese dioxide precipitation;

[0028] 2) washing the manganese dioxide precipitate with deionized water until the washing liquid is neutral and drying to obtain manganese dioxide powder;

[0029] 3) Mix manganese dioxide powder and SuperP uniformly in a mass ratio of 2:1 to obtain a mixed material;

[0030] 4) heat-treating the mixed material at 600° C. for 2 h in an argon atmosphere to obtain a solid battery negative electrode material.

Embodiment 3

[0032] 1) Potassium permanganate and manganese chloride tetrahydrate were added into water according to the ratio of substances of 2:3 to prepare potassium permanganate solution and 3% manganese chloride tetrahydrate solution with a mass fraction of 1.5%, and Mix, stir magnetically at room temperature, and filter to obtain manganese dioxide precipitation;

[0033] 2) washing the manganese dioxide precipitate with deionized water until the washing liquid is neutral and drying to obtain manganese dioxide powder;

[0034] 3) Mix manganese dioxide powder and SuperP uniformly in a mass ratio of 1:1 to obtain a mixed material;

[0035] 4) The mixed material was heat-treated at 500° C. for 3.5 h in an argon atmosphere to obtain a solid battery negative electrode material.

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Abstract

The invention relates to a nano-granular Mn3O4 / Super P lithium ion battery negative electrode material and a preparation method therefor. Potassium permanganate, tetrahydrate manganese chloride and Super P are taken as raw materials; manganese dioxide is prepared by adopting a low temperature coprecipitation method firstly; then manganese dioxide is mixed with Super P to be subjected to thermal treatment to obtain a nano-granular Mn3O4 / Super P (MS) compound; and the compound can be used as the high-performance lithium ion battery negative electrode material. The MS nanoparticles have relatively large specific surface areas and can be in full contact with an electrolyte, so that the activity injection site of the material can be greatly improved; meanwhile, the diffusion distance of lithium ions in the material is shortened, ion transport is accelerated, and the material obtains high specific capacity; and in addition, the granular nanostructure can effectively relieve structural expansion / shrinkage in ion intercalation / deintercalation, so that high cycling stability of the MS particles is realized.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a nano-particle-shaped Mn 3 o 4 / The preparation method of SuperP lithium ion battery anode material. Background technique [0002] Since the 21st century, people's demand for more energy and a cleaner environment has forced many countries to develop a more environmentally friendly energy storage system. Compared with lead-acid batteries and nickel-cadmium batteries, rechargeable lithium-ion batteries have a high Energy density, long cycle life, no memory effect, etc., are expected to be used in electric vehicles and hybrid vehicles. As its application range becomes wider and wider, people have higher and higher performance requirements for lithium-ion batteries. The capacity of lithium-ion batteries depends strongly on its electrode materials, especially the negative electrode materials. The traditional negative electrode material is carbon materials. , but because its th...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M10/0525
CPCH01M4/50H01M10/0525Y02E60/10
Inventor 曹丽云王瑞谊李瑞梓许占位黄剑锋李嘉胤康倩
Owner SHAANXI UNIV OF SCI & TECH
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