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Surface-modified hard-carbon negative electrode material and preparation method thereof

A surface modification and negative electrode material technology, which is applied in the preparation/purification of carbon, electrode manufacturing, battery electrodes, etc., can solve the problems of low initial charge and discharge efficiency, interface side reactions, etc. Stable and adaptable effect

Active Publication Date: 2013-09-18
SHANGHAI SHANSHAN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of the existing hard carbon negative electrode materials such as low initial charge and discharge efficiency and side reactions at the interface, and provide a surface-modified hard carbon negative electrode material and its preparation method

Method used

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  • Surface-modified hard-carbon negative electrode material and preparation method thereof
  • Surface-modified hard-carbon negative electrode material and preparation method thereof
  • Surface-modified hard-carbon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Under stirring, add coal tar pitch, benzaldehyde and p-toluenesulfonic acid in a mass ratio of 10:5:2 into the reactor, mix well, heat up to 120°C for 2 hours of cross-linking polymerization, and cool to room temperature to discharge; The hard carbon carbon precursor is obtained by pulverization and classification, and the particle size is controlled at a volume average particle size D50 of 8-10μm; the hard carbon carbon precursor and the coating agent petroleum pitch (mass ratio 90:10) are alternately added to the coating kettle under stirring During the coating process, heat to 600°C for 3 hours; after coating, perform carbonization treatment at 1150°C for 4 hours under the protection of nitrogen; then cool the reaction product to room temperature and ball mill (ball to material ratio 1:1, speed 400Hz ) For 12 hours, use a 250-mesh vibrating screen to obtain a surface-modified hard carbon negative electrode material with a half-cell capacity of 285.6mAh / g and a first ch...

Embodiment 2

[0034] Under stirring, add coal tar pitch, benzaldehyde and p-toluenesulfonic acid in a mass ratio of 10:7:2 into the reactor, mix well, heat up to 120°C for 2 hours of cross-linking polymerization, and cool down to room temperature for discharge; The hard carbon carbon precursor is obtained by pulverization and classification, and the particle size is controlled at a volume average particle size D50 of 8-10μm; the hard carbon carbon precursor and the coating agent petroleum pitch (mass ratio 85:15) are alternately added to the coating kettle under stirring During the coating process, heat to 350°C for 10 hours; after coating, under the protection of nitrogen, carry out carbonization treatment at 1000°C for 3 hours; then cool the reaction product to room temperature and ball mill (ball to material ratio 1.5:1, speed 400Hz ) For 6 hours, use a 250 mesh vibrating sieving machine to obtain surface-modified hard carbon anode materials, with a half-cell capacity of 286.4mAh / g and an ...

Embodiment 3

[0036] Under stirring, add coal tar pitch, benzaldehyde and sulfuric acid into the reactor at a mass ratio of 10:7:1, mix well, heat up to 120°C for 2 hours of cross-linking polymerization, cool to room temperature and discharge; Hard carbon carbon precursor, the particle size is controlled at the volume average particle size D50 of 8-10μm; the hard carbon carbon precursor and the coating agent coal pitch (mass ratio 90:10) are alternately added to the coating kettle under stirring, and heated Coating treatment to 500℃ for 5 hours; after coating, under the protection of nitrogen, carry out carbonization treatment at 800℃ for 6 hours; then the reaction product is cooled to room temperature and ball milled (ball to material ratio 1:1, rotation speed 400Hz) for 12 hours , Use a 250-mesh vibrating sieving machine to screen to prepare a surface-modified hard carbon anode material with a half-cell capacity of 285.7mAh / g and a first charge-discharge efficiency of 80.5%.

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Abstract

The invention discloses a preparation method for a surface-modified hard-carbon negative electrode material. The preparation method comprises the following steps: (1) subjecting asphalt and a cross-linking agent to cross-linking polymerization and successively carrying out crushing and grading so as to obtain a hard-carbon precursor with a volume mean particle size D50 of 8 to 10 mu m; (2) coating a coating agent on the surface of the hard-carbon precursor; (3) carrying out carbonizing treatment; and (4) carrying out ball milling and grading. The invention further provides the surface-modified hard-carbon negative electrode material prepared by using the method. The surface-modified hard-carbon negative electrode material provided by the invention has high discharge capacity and initial charge and discharge efficiency, good heavy-current charge and discharge performance, good cycle performance, good security, good adaptability to an electrolyte and other additives and stable properties, and different batches of the prepared material barely show a difference. The preparation method provided by the invention has the advantages of easiness, feasibility, wide sources of raw materials and low cost.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a surface modified hard carbon negative electrode material and a preparation method thereof. Background technique [0002] In the 21st century, the earth's oil reserves are increasingly depleted, and the greenhouse effect of automobile exhaust emissions on the environment is becoming more and more serious. In recent years, electric vehicles (EVs) driven by electric motors and hybrid electric vehicles (HEVs) with a combination of engines and electric motors have become the focus of research and development due to the effective use of small and light lithium-ion batteries. Among them, hybrid electric vehicles have the characteristics of economy and low fuel consumption. [0003] Hard carbon anode materials have attracted much attention due to their strong and stable macromolecular structure and are more suitable for charging and discharging at high currents (above 5C / 5C), and their g...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/04H01M4/1393C01B32/05
CPCY02E60/10
Inventor 谢秋生陈志明薄维通杜旭
Owner SHANGHAI SHANSHAN TECH CO LTD
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