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

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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Example Embodiment

[0036] Example 1:

[0037]According to the ratio of P / C mass ratio of 8 / 2, 8g of red phosphorus and 2g of graphite were weighed and manually ground with an agate mortar for 2 hours to make them evenly mixed. After being sealed with nitrogen, the product was ball-milled for 30 hours at a rotational 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. The test results are as follows figure 1 shown. The structure of the product was characterized by Shimadzu XRD-6000 X-ray powder diffractometer as amorphous structure, and the XRD test results are as follows figure 2 a shown. The PHI Quantera SXM X-ray photoelectron spectrometer of Japan Vacuum-PHI Company was used to characterize the bonding between atoms in the product. The XPS test results before and after ball milling of the red phosphorus and graphite mixture are as follows image 3 A...

Example Embodiment

[0039] Example 2:

[0040] According to the ratio of P / C mass ratio of 4 / 6, 4g of red phosphorus and 6g of acetylene black were weighed and manually ground with an agate mortar for 2 hours to make them evenly mixed. After being sealed with nitrogen, the product was ball-milled for 15 hours at a rotational speed of 450 rpm to obtain a black powder product.

[0041] The structure of the product was characterized by Shimadzu XRD-6000 X-ray powder diffractometer as amorphous structure, and the XRD test results are as follows figure 2 b shown. The electrochemical performance was tested by Wuhan Blue Electric CT 2001A battery test system, at 2.0~0.1V (vs.Li + / Li), the first discharge and charge curves are as follows Figure 4 As shown in b, the first discharge and charge specific capacities are 1354.6 and 1061.3 mAh / g, respectively. The electrochemical cycle performance curve is as Figure 5 As shown in a, at 2.0~0.1V (vs.Li + The discharge and charge specific capacities wer...

Example Embodiment

[0042] Example 3:

[0043] According to the ratio of P / C mass ratio of 7 / 3, 3g of red phosphorus and 7g of acetylene black were weighed and manually ground with an agate mortar for 2 hours to make them evenly mixed. After being sealed with nitrogen, the product was ball-milled for 20 hours at a rotational speed of 350 rpm to obtain a black powder product.

[0044] The structure of the product was characterized by Shimadzu XRD-6000 X-ray powder diffractometer as amorphous structure, and the XRD test results are as follows figure 2 c shown. The electrochemical performance was tested by Wuhan Blue Electric CT 2001A battery test system, at 2.0~0.1V (vs.Li + / Li), the first discharge and charge curves are as follows Figure 4 As shown in c, the first discharge and charge specific capacities are 2194.3 and 1755.1 mAh / g, respectively. At 2.0~0.78V(vs.Li + After 40 cycles in the range of / Li), the discharge and charge specific capacities were 545.8 and 552.6 mAh / g, respectively....

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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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