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Phosphorus/carbon composite negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of restricting the development and application of black phosphorus negative electrode materials, difficult industrialization of black phosphorus negative electrodes, and fast capacity decay of black phosphorus, etc. The effect of electrochemical cycle stability, easy large-scale industrial production, and convenient operation

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the conditions for synthesizing black phosphorus are harsh, or require high pressure, or require toxic mercury as a catalyst, or require a long reaction time, it is difficult to industrialize the black phosphorus negative electrode, and the capacity of black phosphorus in the charge-discharge cycle Fast decay, which limits the development and application of black phosphorus anode materials

Method used

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  • Phosphorus/carbon composite negative electrode material of lithium ion battery and preparation method thereof
  • Phosphorus/carbon composite negative electrode material of lithium ion battery and preparation method thereof
  • Phosphorus/carbon composite negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Weigh 8g of red phosphorus and 2g of graphite according to the ratio of P / C mass ratio of 8 / 2 and manually grind them with an agate mortar for 2 hours to mix them evenly, put the above mixture into a stainless steel tank, and add 500g of stainless steel balls. After being sealed with nitrogen gas, ball milling was carried out for 30 hours at a speed of 550 rpm to obtain a black powder product.

[0038] The morphology of the phosphorus / carbon composite was characterized by a Hitachi S-4700 field emission scanning electron microscope, and the test results were as follows: figure 1 shown. Adopt Japan Shimadzu XRD-6000 type X-ray powder diffractometer to characterize the product structure as amorphous structure, its XRD test result is as follows figure 2 as shown in a. The PHI Quantera SXM type X-ray photoelectron energy spectrometer of Japan Vacuum-PHI Company was used to characterize the bonding situation between atoms in the product, and the XPS test results before and...

Embodiment 2

[0040] Weigh 4g of red phosphorus and 6g of acetylene black according to the ratio of P / C mass ratio of 4 / 6 and manually grind them with an agate mortar for 2 hours to mix them evenly. Put the above mixture into a stainless steel tank and add 200g of stainless steel balls. After being sealed with nitrogen gas, ball milling was performed for 15 hours at a speed of 450 rpm to obtain a black powder product.

[0041] Adopt Japan Shimadzu XRD-6000 type X-ray powder diffractometer to characterize the product structure as amorphous structure, its XRD test result is as follows figure 2 as shown in b. The electrochemical performance test was carried out by Wuhan Landian CT 2001A battery test system, at 2.0~0.1V (vs. Li + / Li) range, the first discharge and charge curves such as Figure 4 As shown in b, the first discharge and charge specific capacities are 1354.6 and 1061.3mAh / g, respectively. Electrochemical cycle performance curves such as Figure 5 As shown in a, at 2.0~0.1V (v...

Embodiment 3

[0043] Weigh 3g of red phosphorus and 7g of acetylene black according to the ratio of P / C mass ratio of 7 / 3 and manually grind them with an agate mortar for 2 hours to mix them evenly. Put the above mixture into a stainless steel tank and add 800g of stainless steel balls. After sealing with nitrogen gas, ball mill for 20 hours under the condition of rotating speed of 350 rpm to obtain a black powder product.

[0044] Adopt Japan Shimadzu XRD-6000 type X-ray powder diffractometer to characterize the product structure as amorphous structure, its XRD test result is as follows figure 2 as shown in c. The electrochemical performance test was carried out by Wuhan Landian CT 2001A battery test system, at 2.0~0.1V (vs.Li + / Li) range, the first discharge and charge curves such as Figure 4 As shown in c, the first discharge and charge specific capacities are 2194.3 and 1755.1mAh / g, respectively. At 2.0~0.78V (vs. Li + After 40 cycles in the range of / Li), the discharge and charg...

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Abstract

The invention discloses a phosphorus / carbon composite negative electrode material of a lithium ion battery and a preparation method thereof, which belong to the technical field of electrode materials of the lithium ion batteries and preparation thereof. In the composite material, the mass ratio of P to C is 8 / 2-4 / 6, and the composite material has an amorphous structure containing P-C chemical bonds. A phosphorus source material and a carbon source material are mixed according to the mass ratio of the P to the C of 8 / 2-4 / 6; then the mixed material is added into a stainless steel tank; stainless steel balls are added into the mixed material according to the mass ratio of the mixed material and the stainless steel balls of 1:20-1:80; and the ball milling is performed for 5 to 30 hours under the protection of nitrogen to obtain the phosphorus / carbon composite material. The phosphorus / carbon composite material has higher reversible specific capacity and good electrochemical cycle stability; and the material has simple process and convenient operation, and is easy to realize mass industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials and preparation thereof, and in particular relates to a lithium-ion battery phosphorus / carbon composite negative electrode material and a preparation method thereof. Background technique [0002] Graphite, as an anode material for lithium-ion batteries, has low cost, high cycle efficiency and good electrochemical cycle stability. However, its lithium storage capacity is low, with a theoretical specific capacity of 372mAh / g, and there are safety hazards when charging at high rates. Therefore, the development of new negative electrode materials has become the key to improving the performance of lithium-ion batteries. [0003] Phosphorus anode materials are considered to be one of the most promising anode materials for lithium-ion batteries due to their advantages of high capacity, low cost, non-toxicity and pollution-free. Among the allotropes of phosphorus, the phos...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04
CPCY02E60/12Y02E60/10
Inventor 杨文胜孙洁杨占旭
Owner BEIJING UNIV OF CHEM TECH
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