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Composite hard carbon cathode material of lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low initial charge and discharge efficiency, and achieve the effects of high rate, low production cost, and high initial coulombic efficiency.

Active Publication Date: 2010-11-17
JIXI BTR GRAPHITE IND PARK CO LTD +2
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Problems solved by technology

But its first charge and discharge efficiency is low, only about 45%

Method used

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  • Composite hard carbon cathode material of lithium ion battery and preparation method thereof
  • Composite hard carbon cathode material of lithium ion battery and preparation method thereof
  • Composite hard carbon cathode material of lithium ion battery and preparation method thereof

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Embodiment Construction

[0023] The present invention will be further described in detail below with reference to the drawings and embodiments. In the composite hard carbon negative electrode material of the lithium ion battery of the present invention, the hard carbon matrix is ​​coated with a coating, which is formed by pyrolysis, and the mass of the precursor is 1-15% of the mass of the hard carbon matrix precursor.

[0024] The hard carbon matrix precursor is composed of the following mass ratios: 25% to less than 100% of thermoplastic resin (25%≤thermoplastic resin<100%), greater than 0 to less than 75% of curing agent (0<curing agent≤75 %), more than 0 to less than or equal to 15% of dopants (0<dopants≤15%), dopants are more than one kind of metal element, non-metal element, metal compound and non-metal compound, thermoplastic resin and After the curing agent is polymerized and chemically reacted, it is mixed with the dopant and then pyrolyzed to form a hard carbon matrix.

[0025] The hard carbon m...

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Abstract

The invention discloses a composite hard carbon cathode material of a lithium ion battery and a preparation method thereof, aiming at improving the first coulombic efficiency. In the composite hard carbon cathode material, a coating object is coated outside a hard carbon matrix, a precursor of the hard carbon matrix comprises a thermoplastic resin which forms the hard carbon matrix by pyrolysis, and a precursor of the coating object is an organic matter. The preparation method comprises the steps of curing, pyrolyzing, pulverizing and coating. Compared with the prior art, a curing agent and adopant are added to the resin for curing, the cured mixture is taken as a carbon source, and then the carbon source is pyrolyzed and coated to finally obtain the composite hard carbon cathode material; and the first reversible capacity of the obtained composite hard carbon cathode material is more than 455.2mAh / g and the first coulombic efficiency thereof is more than 79.4% in the case of 0.2C, thus the obtained composite hard carbon cathode material has high capacity and high first coulombic efficiency, meets the requirement of the lithium ion battery with high capacity, high multiplying power and excellent high and low temperature cycle performance on the charge-discharge performances of the cathode material, has low production cost and is suitable for industrial production.

Description

Technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for multifunctional portable electronic equipment in the information age and the rapid development of electric vehicles, the development of new lithium battery electrode materials with high specific energy, high rate, high safety, long life, and low cost has become an internationally important The frontier research field. The most successful carbon anode materials in the prior art include artificial graphite, mesophase carbon microsphere MCMB, and petroleum coke. However, its 372mAh / g specific capacity is too low, and it is increasingly unable to meet the requirements, and its fragile structure will lead to very limited stability, and it is also highly sensitive to electrolyte. Therefore, people turn thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 岳敏汪福明闫慧青邓明华薛嘉渔
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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