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Hard carbon cathode material for lithium ion power and energy storage battery and preparation method of hard carbon cathode material

A negative electrode material, hard carbon technology, applied in battery electrodes, carbon preparation/purification, circuits, etc., can solve the problems that the electrical properties of negative electrode materials cannot meet the needs, cannot meet the needs, and the reversible capacity is low, and the first Coulomb efficiency is large. , low cost, and the effect of improving cycle performance

Active Publication Date: 2013-05-08
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its theoretical lithium intercalation capacity of 372mAh / g is increasingly unable to meet the demand, and the unique layered structure leads to limited cycle stability and is highly sensitive to the electrolyte. Therefore, it is urgent to find a negative electrode material to replace graphite
[0003] Hard carbon is a kind of carbon material, which has the characteristics of high specific capacity, large irreversible capacity for the first time, good rate performance, etc., as well as excellent rate and cycle performance and low temperature characteristics. Such as furfural resin thermal decomposition products, phenolic resin thermal decomposition products, carbon black, etc., have the disadvantages of low reversible capacity, low initial efficiency, and low discharge voltage. Therefore, hard carbon materials need to be modified
[0004] CN101887966B discloses a preparation method of a lithium-ion battery composite hard carbon negative electrode material, including: curing, pyrolysis, pulverization, and coating. Compared with the prior art, the resin is cured by adding a curing agent and a dopant. The carbon source is pyrolyzed and coated to obtain a composite hard carbon negative electrode material, but this method uses thermoplastic resin as a raw material, and the cost is high, and the electrical properties of the obtained negative electrode material cannot meet the needs

Method used

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  • Hard carbon cathode material for lithium ion power and energy storage battery and preparation method of hard carbon cathode material
  • Hard carbon cathode material for lithium ion power and energy storage battery and preparation method of hard carbon cathode material
  • Hard carbon cathode material for lithium ion power and energy storage battery and preparation method of hard carbon cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Pre-curing: add 15 g of dopant ammonium dihydrogen phosphate to 60 g of furfural phenol resin, use a high-speed disperser at a speed of 2800r / min, and cure for 30 minutes in air at 250°C for 4 hours to obtain pre-curing Precursor.

[0062] (2) Crushing: The pre-cured precursor is ball-milled with a planetary ball mill to obtain powder particles with an average particle size of 20 μm.

[0063] (3) Curing: 25g of curing agent hexamethylenediamine was added to the powder, stirred evenly, and cured in air at 200°C for 12 hours to obtain a solid precursor.

[0064] (4) Pyrolysis: put the cured precursor into a box-type resistance furnace, heat up to 1050°C at a heating rate of 10°C / min, pyrolyze for 1 hour, and cool down to room temperature naturally to obtain hard carbon. The pyrolysis is carried out under a nitrogen atmosphere , the nitrogen flow rate is 0.3m 3 / h.

[0065] (5) Crushing: use a planetary ball mill to grind the hard carbon balls to an average particle...

Embodiment 2

[0068] (1) Pre-curing: Add 10 g of dopant phosphoric acid to 80 g of phenolic resin, use a high-speed disperser at a speed of 2000 r / min, and cure for 60 minutes in air at 200°C for 6 hours to obtain a pre-cured precursor.

[0069] (2) Crushing: The pre-cured precursor was ball-milled with a planetary ball mill to obtain powder particles with an average particle size of 24 μm.

[0070] (3) Curing: 10 g of curing agent melamine was added to the powder, stirred evenly, and cured in air at 220° C. for 6 hours to obtain a solid precursor.

[0071] (4) Pyrolysis: put the cured precursor into a box-type resistance furnace, heat up to 950°C at a heating rate of 5°C / min, pyrolyze for 2 hours, and cool down to room temperature naturally to obtain hard carbon. The pyrolysis is carried out under a nitrogen atmosphere , the nitrogen flow rate is 0.4m 3 / h.

[0072] (5) Crushing: use a planetary ball mill to grind the hard carbon balls to an average particle size of 10 μm to obtain a har...

Embodiment 3

[0075] (1) Pre-curing: Add 15 g of dopant boric acid to 70 g of epoxy resin, use a high-speed disperser at a speed of 1200 r / min, and cure for 120 min in air at 150°C for 8 hours to obtain a pre-cured precursor.

[0076] (2) Crushing: The pre-cured precursor is ball-milled with a planetary ball mill to obtain powder particles with an average particle size of 22 μm.

[0077] (3) Curing: 15g of curing agent phthalic anhydride was added to the powder, stirred evenly, and cured in air at 80°C for 20 hours to obtain a solid precursor.

[0078] (4) Pyrolysis: put the cured precursor into a box-type resistance furnace, heat up to 950°C at a heating rate of 12°C / min, pyrolyze for 1 hour, and cool down to room temperature naturally to produce hard carbon. The pyrolysis is carried out under a nitrogen atmosphere , the nitrogen flow rate is 0.4m 3 / h.

[0079] (5) Crushing: use a planetary ball mill to grind the hard carbon balls to an average particle size of 16 μm to obtain a hard ca...

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Abstract

The invention relates to a preparation method of a hard carbon cathode material. The preparation method comprises the step of preparing the hard carbon cathode material by using thermosetting resin or pyrolysis products of a mixture of thermosetting resin and thermoplastic resin as a hard carbon matrix and adopting a carbon material as a coating. In the preparation process of the hard carbon cathode material, a curing agent and a doping matter can be added. The hard carbon cathode material prepared by adopting the preparation method has the characteristics of high capacity, high first-time coulombic efficiency, excellent rate performance, low cost and the like, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a hard carbon negative electrode material for lithium ion power and energy storage batteries and a preparation method thereof. Background technique [0002] With the development of science and technology and the improvement of living standards, human beings have an increasing demand for multifunctional portable electronic devices and electric vehicles. Therefore, research on high energy density, good load characteristics, fast charging and discharging, high safety performance, long cycle life, Low-cost new lithium-ion battery electrode materials have become an important frontier field in the world. The negative electrode material is one of the important factors affecting the capacity of lithium-ion batteries. In the prior art, graphite or modified graphite is generally used. However, its theoretical lithium intercalation capacity of 372mAh / g ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36C01B31/02C01B32/05
CPCY02E60/12Y02E60/10
Inventor 岳敏沈海杰汪福明黄友元贺雪琴
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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