Hard carbon cathode material and preparation method thereof, and application of hard carbon cathode material

A technology of negative electrode material and hard carbon, applied in the field of hard carbon negative electrode material and its preparation, can solve the problems of large initial irreversible capacity loss, low initial coulombic efficiency, low battery discharge capacity, etc., achieving low cost, improving initial coulombic efficiency, The effect of prolonging the cycle life

Active Publication Date: 2019-08-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hard carbon has more pores, rough surface, and large specific surface area, resulting in more side reactions and a large initial irreversible capacity loss.
The first irreversible capacity loss consumes a large amount of lithium ions extracted from the electrolyte and positive electrode material, resulting in a lower first Coulombic efficiency, which also makes the battery discharge capacity lower
[0004] The prior art discloses that plant extracts, resins, a

Method used

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  • Hard carbon cathode material and preparation method thereof, and application of hard carbon cathode material
  • Hard carbon cathode material and preparation method thereof, and application of hard carbon cathode material

Examples

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Example Embodiment

[0056] According to the method for preparing hard carbon anode material of the embodiment of the present invention, by pretreating the carbon-containing raw material, the impurities in the carbon-containing raw material can be removed, and the carbon-containing raw material can be transformed into an amorphous structure cross-linked accumulation At the same time, it has a wide range of carbon-containing raw materials and low cost, which is conducive to reducing the preparation cost of hard carbon precursors; by prelithiating the hard carbon precursors, the surface of the hard carbon precursors is coated with lithium-containing substances , Lithium-containing materials can be consumed when the SEI film is formed at the negative electrode interface during battery formation, thereby avoiding the consumption of lithium ions extracted from the electrolyte and the positive electrode material during the formation of the SEI film, thereby increasing the battery capacity and the first cou...

Example Embodiment

[0061] Example 1

[0062] 100g rice husks are washed and floated for 10 minutes to remove dust and other solid particles. After being drained, they are sent to a vacuum drying box for drying at 105 degrees Celsius; the washed and dried carbon-containing raw materials are heat-treated under inert atmosphere nitrogen. The temperature is 800 degrees Celsius and the time is 2h; after cooling, the heat-treated material is crushed by a ball mill to obtain a crushed material with a particle size of D50=15μm; the crushed material is ultrasonically pickled with 100ml of hydrochloric acid with a concentration of 10wt% for 1h, Then the material after ultrasonic pickling is washed with water until the pH value of the washing solution is neutral, and the hard carbon precursor is obtained after drying at 105 degrees Celsius; 25g of the hard carbon precursor is added to 66g of 10wt% lithium acetate, stirring, and then gradually added 26g of ammonium fluoride with a concentration of 10wt% was mi...

Example Embodiment

[0064] Example 2

[0065] 100g of broken reed rods were washed and floated for 10 minutes to remove dust and other solid particles, and then sent to a vacuum drying oven for drying at 105 degrees Celsius; the washed and dried carbonaceous raw materials were heat-treated under an inert atmosphere of argon , The heat treatment temperature is 900 degrees Celsius, and the time is 2h; after cooling, the heat-treated materials are crushed by a ball mill to obtain crushed materials with a particle size of D50=13μm; the crushed materials are ultrasonically pickled with 100ml of hydrochloric acid with a concentration of 10wt% 1h, then wash the material after ultrasonic pickling until the pH of the washing solution is neutral. After drying at 105 degrees Celsius, a hard carbon precursor is obtained; 25g of hard carbon precursor is added to 66g of lithium acetate with a concentration of 10wt% and stirred, and then 26g of ammonium fluoride with a concentration of 10wt% was gradually added, m...

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Abstract

The invention discloses a hard carbon cathode material and a preparation method thereof, and application of a hard carbon cathode material. The method comprises the steps of: (1) performing pre-treatment of a carbon-containing raw material to obtain a hard carbon precursor; (2) performing pre-lithiation treatment on the hard carbon precursor so as to obtain a solid pre-lithiation hard carbon precursor coated with a lithium-containing substance on the surface; (3) performing coating treatment of the pre-lithiation hard carbon precursor and asphalt; and (4) performing carbonizing treatment of the coated pre-lithiated hard carbon precursor obtained in the step (3) in an inert atmosphere, performing crushing, screening and removing magnetism to obtain the hard carbon negative electrode material. The hard negative electrode material is low in preparation cost, and the surface of the hard carbon precursor is coated with the lithium-containing substance and the asphalt so that the first coulombic efficiency of a battery prepared from the hard carbon negative electrode material is not less than 90%, the multiplying power is not less than 98%, and the charge-discharge reversible capacity isnot less than 480 mAh/g.

Description

technical field [0001] The invention belongs to the field of negative electrode materials, in particular, the invention relates to a hard carbon negative electrode material and its preparation method and application. Background technique [0002] With the continuous improvement of power battery energy density and other comprehensive performance requirements, the theoretical capacity of natural graphite and artificial graphite anode materials is 372mAh / g, and it can reach 365mAh / g at present, and it is difficult to increase the anode capacity. Natural graphite and artificial graphite anode materials have been difficult to meet the requirements of high energy density batteries, and hard carbon has attracted more and more attention because of its high specific capacity, excellent cycle, rate and low temperature performance. [0003] Hard carbon is an amorphous carbon that is difficult to graphitize at high temperatures (≥2800°C). It is formed by cross-linking and stacking graph...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 彭友山李宇飞
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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