Preparation method of porous tin-carbon composite negative material

A composite material, tin-carbon technology, applied in the direction of non-aqueous electrolyte battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of large volume change, structural collapse, loss of electrochemical activity, etc., to achieve wide distribution and low price Effect

Inactive Publication Date: 2015-02-18
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume of tin-based negative electrode materials changes greatly during the process of intercalation and desorption of sodium, which can easily cause electrode pulverization and structural collapse, thereby losing electrochemical activity, which makes it unable to be directly used as a negative electrode for sodium-ion batteries.

Method used

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  • Preparation method of porous tin-carbon composite negative material

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Effect test

Embodiment 1

[0025] A method for preparing a porous tin-carbon composite material, comprising the following preparation steps:

[0026] A. Put tin oxide, sucrose and sodium carbonate into a ball mill tank according to the amount of substances = 1:1:1, and ball mill at 300 rpm for 4 hours to obtain a mixed precursor;

[0027] B. Place the precursor in a flowing nitrogen atmosphere in a tube furnace and other devices, raise the temperature to 600°C at a heating rate of 3°C / min, keep it warm for 6 hours, and cool to room temperature with the furnace;

[0028] C. The obtained calcined product was washed with deionized water, then centrifuged, washed several times, and dried at 80°C to obtain a porous tin-carbon composite material.

Embodiment 2

[0030] A method for preparing a porous tin-carbon composite material, comprising the following preparation steps:

[0031] A. Put tin oxide, glucose and lithium carbonate into a ball mill tank according to the amount of substances = 0.6:1.2:1.2, and ball mill for 1 hour at 400 rpm to obtain a mixed precursor;

[0032] B. Place the precursor in a flowing nitrogen atmosphere in a tube furnace and other devices, raise the temperature to 500°C at a heating rate of 5°C / min, keep it warm for 1 hour, and cool to room temperature with the furnace;

[0033] C. The obtained calcined product was washed with deionized water, then centrifuged, washed several times, and dried at 50°C to obtain a porous tin-carbon composite material.

Embodiment 3

[0035] A method for preparing a porous tin-carbon composite material, comprising the following preparation steps:

[0036] A. Put tin oxide, graphite and sodium carbonate into a ball mill jar according to the amount of substances = 2.8:0.1:0.1, and ball mill at 200 rpm for 12 hours to obtain a mixed precursor;

[0037] B. Place the precursor in a flowing nitrogen atmosphere in a tube furnace and other devices, raise the temperature to 1000°C at a heating rate of 2°C / min, keep it warm for 3 hours, and cool to room temperature with the furnace;

[0038] C. The obtained calcined product was washed with deionized water, then centrifuged, washed several times, and dried at 100°C to obtain a porous tin-carbon composite material.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a porous tin-carbon composite negative material, a composite material prepared through the method and a corresponding battery. The preparation method comprises the following steps of: firstly loading tin oxide, a carbon source and carbonate into a ball-milling tank according to the stoichiometric ratio, and carrying out ball-milling mixing to obtain a precursor; then placing the precursor into a flowing inert atmosphere, and calcining in a tube furnace; finally washing and drying an obtained calcined product to obtain the porous tin-carbon composite negative material. The porous tin-carbon composite negative material obtained through the method disclosed by the invention has the advantages of high capacity, excellent electrochemical property, low cost, simple production process and easiness for operation.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a porous tin-carbon composite negative electrode material, a composite material prepared by the method and a corresponding battery. Background technique [0002] Lithium-ion batteries are widely used in consumer and power electronic products due to their advantages such as high working voltage, high energy density, high safety, low self-discharge, long cycle life and no memory effect. However, the limited lithium resource reserves and high material cost have brought huge obstacles to its widespread application. The development of an advanced battery system with abundant resources, low cost and high safety is an inevitable solution to the future development of new energy. Sodium element is in the same main group as lithium, with similar chemical properties and relatively close electrode potential, and sodium is abundant in resources, and its ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/36H01M4/13H01M10/0525
CPCH01M4/133H01M4/134H01M4/364H01M4/387H01M4/587H01M10/05H01M10/0525Y02E60/10
Inventor 杜陈强张新河唐致远李中延郑新宇丁玉茹汤春微
Owner MCNAIR TECH
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