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Preparation method for coating anode material of lithium battery

A coating material and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low sulfur conductivity, complicated reaction process, and difficulty in exerting the excellent performance of sulfur electrodes, so as to reduce self-discharge, suppress Dissolving, avoiding the effect of the shuttle effect

Inactive Publication Date: 2014-02-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many technical difficulties to be overcome before the commercialization of lithium-sulfur batteries, such as the low conductivity of the positive electrode active material sulfur (5×10 -30 S / cm) and the "shuttle effect" caused by the solubility of intermediate polysulfides
At the same time, the electrochemical reaction of sulfur is multi-electron and multi-step, which makes the theoretical capacity of sulfur as high as 1675 mAh / g, but the reaction process is complicated, and the structure and volume of the sulfur electrode change with the cycle process, so in fact sulfur The excellent performance of the electrode is difficult to play

Method used

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  • Preparation method for coating anode material of lithium battery
  • Preparation method for coating anode material of lithium battery
  • Preparation method for coating anode material of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Lithium cobaltate is used as the coating material, lithium cobaltate and elemental sulfur are weighed according to the mass ratio, and the mass ratio of lithium cobaltate to elemental sulfur is 1:2; In the sodium polyacrylate aqueous solution, wherein the number average molecular weight of the sodium polyacrylate is 2200, stir for 10 minutes to obtain a dispersed solution of sulfur; 3 (CH 2 ) 16 COONa is the solute, water is used as the solvent, and a surfactant aqueous solution with a mass percentage concentration of 5% is prepared, and then lithium cobaltate is dissolved in the surfactant aqueous solution at 25°C to obtain a dispersed solution of lithium cobaltate. Lithium cobaltate with CH 3 (CH 2 ) 16 The mass ratio of COONa is 1:0.01; the dispersion solution of sulfur and the dispersion solution of lithium cobaltate are mixed uniformly to obtain a mixed solution system, and the pH value of the mixed solution system is adjusted to 8 with 0.01mol / L acetic acid, a...

Embodiment 2

[0029] Lithium iron phosphate is used as the coating material, and lithium iron phosphate and elemental sulfur are weighed according to the mass ratio. The mass ratio of lithium iron phosphate to elemental sulfur is 1:4; In the sodium polyacrylate aqueous solution, wherein the number average molecular weight of the sodium polyacrylate is 2200, stir for 10 minutes to obtain a dispersed solution of sulfur; 3 (CH 2 ) 16 COONa is the solute, water is used as the solvent, and a surfactant aqueous solution with a mass percentage concentration of 5% is prepared, and then lithium iron phosphate is dissolved in the surfactant aqueous solution at 25°C to obtain a dispersed solution of lithium iron phosphate, lithium iron phosphate with CH 3 (CH 2 ) 16 The mass ratio of COONa is 1:0.01; the dispersion solution of sulfur and the dispersion solution of lithium iron phosphate are mixed uniformly to obtain a mixed solution system, and the pH value of the mixed solution system is adjusted...

Embodiment 3

[0035] Lithium manganate is used as the coating material, lithium manganate and elemental sulfur are weighed according to the mass ratio, and the mass ratio of lithium manganate to elemental sulfur is 1:9; In the sodium polyacrylate aqueous solution, wherein the number average molecular weight of the sodium polyacrylate is 2200, stir for 10 minutes to obtain a dispersed solution of sulfur; 3 (CH 2 ) 16 COONa is the solute, water is used as the solvent, and a surfactant aqueous solution with a mass percentage concentration of 5% is prepared, and then lithium manganate is dissolved in the surfactant aqueous solution at 25°C to obtain a dispersion solution of lithium manganate. Lithium manganate with CH 3 (CH 2 ) 16 The mass ratio of COONa is 1:0.01; the dispersion solution of sulfur is mixed with the dispersion solution of lithium manganate evenly to obtain a mixed solution system, and the pH value of the mixed solution system is adjusted to 8 with 0.01mol / L acetic acid, and...

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Abstract

The invention provides a preparation method for a coating anode material of a lithium battery. The preparation method comprises the following specific steps: (1) weighing a coating material and monomer sulfur; weighing the coating material and the monomer sulfur according to a mass ratio, wherein the mass ratio of the coating material to the monomer sulfur ranges from 1:1 to 1:100; (2) preparing a dispersion solution of the sulfur: dissolving the monomer sulfur into a sodium polyacrylate water solution with the mass percentage of 2%-10% at a room temperature to obtain the dispersion solution of the sulfur; (3) preparing a dispersion solution of the coating material: dissolving the coating material into a surfactant water solution at 20-45 DEG C to obtain the dispersion solution of the coating material; and (4) preparing the coating anode material of the lithium battery. According to the preparation method for the coating anode material of the lithium battery, self discharge of the battery is reduced effectively and the stability of the structure in a charging / discharging process of a sulfur electrode is kept; a sulfur active material prepared by the preparation method is used as a lithium-sulfur secondary battery anode material and the prepared lithium material has a high specific discharge capacity and a good circulating performance.

Description

technical field [0001] The invention relates to a method for preparing a coated positive electrode material of a lithium battery, belonging to the field of battery materials. Background technique [0002] The theoretical specific capacity of lithium-sulfur battery is as high as 1675 mAh / g, the theoretical energy density is 2600Wh / kg, and the cost of elemental sulfur is low, the environment is friendly, the source is abundant, and the battery safety is good, which can meet the current market demand for lightweight and miniaturized chemical power sources. , low cost and non-toxic urgent requirements, so it has received extensive attention in recent years. However, there are still many technical difficulties to be overcome before the commercialization of lithium-sulfur batteries, such as the low conductivity of the positive electrode active material sulfur (5×10 -30 S / cm) and the "shuttle effect" caused by the solubility of intermediate polysulfides. At the same time, the el...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/364H01M4/38H01M10/0525Y02E60/10
Inventor 王圣平
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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