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A kind of positive electrode composite material of lithium battery and preparation method thereof

A composite material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficulty in exerting the excellent performance of sulfur electrodes, complex reaction process, accompanying changes in volume, etc., to achieve good cycle performance, simple preparation method, Effect of high discharge specific capacity

Active Publication Date: 2015-08-05
广州微宏电源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 1675mAh / g, but the reaction process is complicated, and the structure and volume of the sulfur electrode change with it, so in fact the excellent performance of the sulfur electrode Difficult to play

Method used

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  • A kind of positive electrode composite material of lithium battery and preparation method thereof

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Effect test

Embodiment 1

[0019] A lithium battery positive electrode composite material, the material is composed of the following raw materials in mass ratio: 85% of sulfur element, 12.5% ​​of acetylene black, 2.5% of nano-scale copper powder, polyvinylidene fluoride is used as the binder, and the consumption is the mass of the above-mentioned raw materials 3-5% of the total.

[0020] The preparation method of the composite material comprises the following steps in turn: 1) weighing 8.5 kg of sulfur elemental substance, 1.25 kg of acetylene black, 0.25 kg of nano-scale copper powder, and 0.3 kg of polyvinylidene fluoride; 2) weighing the The sulfur element is completely dissolved in 161.5 kilograms of carbon disulfide to form a carbon disulfide solution; 3) at normal temperature, acetylene black, copper powder, polyvinylidene fluoride powder are mixed with the carbon disulfide solution obtained in step 2) to obtain an emulsion; 4) the step 3 ) The obtained emulsion is coated on the aluminum foil, and...

Embodiment 2

[0025] The preparation of the lithium battery positive electrode composite material and the production and testing of the experimental battery are the same as in Example 1, but the following parameters have changed:

[0026] The mass ratio of sulfur element, acetylene black, and nanometer copper powder is 85:13:2.

[0027] The first discharge specific capacity of the sulfur electrode reaches 1288.9mAh / g (calculated based on sulfur).

Embodiment 3

[0029] The preparation of the lithium battery positive electrode composite material and the production and testing of the experimental battery are the same as in Example 1, but the following parameters have changed:

[0030] The mass ratio of sulfur element, acetylene black, and nanometer copper powder is 85:13.5:1.5.

[0031] The first discharge specific capacity of the sulfur electrode reaches 1201.3mAh / g (based on sulfur).

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Abstract

The invention discloses a lithium battery anode composite material and a preparing method thereof, which aim at providing the lithium battery anode composite material with good sulfur dispersity and electrochemical performance. By mass ratio, raw materials of the lithium battery anode composite material include 85% of elemental sulfur, 12.5%-14.9% of acetylene black, 0.1%-2.5% of copper powder and adhesives accounting for 3-5% of mass of the above raw materials. All the materials are mixed uniformly through solvent, coated on aluminium foils and dried to form the lithium battery anode composite material. The preparing method includes the following steps: (1) weighing the raw materials according to the mass ratio: 85% of elemental sulfur, 12.5%-14.9% of acetylene black and 0.1%-2.5% of copper powder; (2) completely dissolving the weighed elemental sulfur in the step (1) in carbon disulfide to form carbon disulfide solution; (3) mixing the acetylene black, the copper powder, polyvinylidene fluoride powder and the carbon disulfide solution obtained through the step (2) so as to obtain emulsion; and (4) coating the emulsion obtained through the step (3) on the aluminium foils, and drying and cutting the aluminium foils to obtain sulfur electrodes of a lithium-sulfur battery. The lithium battery anode composite material and the preparing method thereof belong to the technical field of electrode materials.

Description

technical field [0001] The invention relates to a composite material, specifically, a lithium battery cathode composite material, and also relates to a preparation method of the composite material, which belongs to the technical field of battery materials. Background technique [0002] The theoretical energy density (2600Wh / kg) of lithium-sulfur batteries is 4.5 times that of lithium cobalt oxide-based lithium-ion batteries and 6.6 times that of lithium-iron phosphate-based lithium-ion batteries. At present, the urgent requirements of the market for light weight, miniaturization, low cost and non-toxicity of chemical power sources have attracted 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 polysulfide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10
Inventor 郭志东郭志勤
Owner 广州微宏电源科技有限公司