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A kind of 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 interface side reactions, low initial charge and discharge efficiency, etc., and achieve stable product properties and simple and easy preparation methods Good effect of charging and discharging performance

Active Publication Date: 2016-05-18
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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  • A kind of surface-modified hard carbon negative electrode material and preparation method thereof
  • A kind of surface-modified hard carbon negative electrode material and preparation method thereof
  • A kind of 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, coal tar pitch, benzaldehyde and p-toluenesulfonic acid were added to the reaction kettle at a mass ratio of 10:5:2, mixed uniformly, heated to 120°C for 2 hours for cross-linking polymerization, cooled to room temperature and discharged; Pulverize and classify the hard carbon carbon precursor, the particle size is controlled at a volume average particle diameter D50 of 8-10 μm; the hard carbon carbon precursor and the coating agent petroleum pitch (mass ratio 90:10) are alternately added to the coating tank under stirring , heated to 600°C for 3 hours; after coating, under the protection of nitrogen, carbonized at 1150°C for 4 hours; after that, the reaction product was cooled to room temperature and ball milled (ball-to-material ratio 1:1, speed 400Hz ) for 12 hours, using a 250-mesh vibrating sieving machine to sieve to obtain a surface-modified hard carbon negative electrode material with a half-cell capacity of 285.6mAh / g and an initial charge-discha...

Embodiment 2

[0034] Under stirring, coal tar pitch, benzaldehyde and p-toluenesulfonic acid were added to the reaction kettle at a mass ratio of 10:7:2, mixed evenly, heated to 120°C for 2 hours for cross-linking polymerization, cooled to room temperature and discharged; Pulverize and classify the hard carbon carbon precursor, the particle size is controlled at a volume average particle diameter D50 of 8-10 μm; the hard carbon carbon precursor and the coating agent petroleum pitch (mass ratio 85:15) are alternately added to the coating tank under stirring , heated to 350°C for 10 hours of coating treatment; after the coating was completed, under the protection of nitrogen, carbonization treatment was carried out at 1000°C for 3 hours; after that, the reaction product was cooled to room temperature and ball milled (ball-to-material ratio 1.5:1, speed 400Hz ) for 6 hours, using a 250-mesh vibrating sieving machine to sieve to obtain a surface-modified hard carbon negative electrode material, ...

Embodiment 3

[0036] Under stirring, coal tar pitch, benzaldehyde and sulfuric acid were added to the reaction kettle at a mass ratio of 10:7:1, mixed evenly, heated to 120°C for 2 hours for cross-linking polymerization, cooled to room temperature and discharged; jet crushing and classification to obtain Hard carbon carbon precursor, the particle size is controlled so that the volume average particle size D50 is 8-10 μm; the hard carbon carbon precursor and the coating agent coal tar pitch (mass ratio 90:10) are alternately added to the coating kettle under stirring, and heated Coating treatment at 500°C for 5 hours; after coating, under the protection of nitrogen, carry out carbonization treatment at 800°C for 6 hours; then cool the reaction product to room temperature, and ball mill (ball-to-material ratio 1:1, speed 400Hz) for 12 hours , using a 250-mesh vibrating sieving machine to sieve to obtain a surface-modified hard carbon negative electrode material, with a half-cell capacity of 28...

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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 oil reserves on the earth are increasingly depleted, and the greenhouse effect of automobile exhaust emissions on the environment is becoming increasingly serious. In recent years, electric motor-driven electric vehicles (EVs) and hybrid electric vehicles (HEVs) that combine engines and electric motors have become the focus of research and development due to their ability to effectively utilize small and light lithium-ion batteries. Among them, hybrid electric vehicles are more economical and low fuel consumption. [0003] Due to its firm and stable macromolecular layer structure, hard carbon anode materials are more suitable for charging and discharging under high current (5C / 5C) and have attracted much attention. Its good safet...

Claims

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Application Information

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