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Soft carbon negative electrode material and preparation method and application thereof

A negative electrode material, soft carbon technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low capacity retention rate, low initial discharge capacity, and low compaction density

Active Publication Date: 2021-03-26
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problems of low compaction density, low initial discharge capacity and low capacity retention rate of lithium ion battery negative electrode materials in the prior art, and provide a kind of soft carbon negative electrode material and its preparation method and use

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  • Soft carbon negative electrode material and preparation method and application thereof
  • Soft carbon negative electrode material and preparation method and application thereof
  • Soft carbon negative electrode material and preparation method and application thereof

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Embodiment 1

[0065] The preparation of embodiment 1 soft carbon negative electrode material

[0066] Step (1): Polymerize coal tar at 800°C for 40 hours to obtain mesocarbon microspheres;

[0067] Step (2): The mesophase carbon microspheres were fused at 80°C for 3 minutes, then pulverized with a pulverizer at a speed of 500 rpm, passed through a 200-mesh sieve, and the under-sieve was taken in an inert atmosphere at Carry out pre-carbonization treatment at 900°C for 16 hours to obtain a carbon precursor;

[0068] Step (3): The carbon precursor is pulverized with a pulverizer at a speed of 800 rpm, and then classified by a classifier with a frequency of 200 Hz to obtain a carbon precursor with a volume average particle diameter D50 of 15.3 μm. body particles, the carbon precursor particles were carbonized and heat-treated at 2000°C for 30 hours in an inert atmosphere to obtain carbonized particles;

[0069] Step (4): The carbonized particles were mixed with single crystal silicon having ...

Embodiment 2

[0070] The preparation of embodiment 2 soft carbon negative electrode material

[0071] Step (1): Polymerizing coal tar at 600°C for 40 hours to obtain mesophase carbon microspheres;

[0072] Step (2): The mesocarbon microspheres were fused at 80° C. for 5 minutes, then pulverized with a pulverizer at a speed of 300 rpm, passed through a 200-mesh sieve, and the under-sieve was taken in an inert atmosphere at Carry out pre-carbonization treatment at 200°C for 48 hours to obtain a carbon precursor;

[0073] Step (3): The carbon precursor is pulverized by a pulverizer at a speed of 500 rpm, and then classified by a classifier with a frequency of 300 Hz to obtain a carbon precursor with a volume average particle diameter D50 of 22.9 μm. Carbide particles, the carbon precursor particles were carbonized and heat-treated at 1600°C for 30 hours in an inert atmosphere to obtain carbonized particles;

[0074] Step (4): The carbonized particles were mixed with single crystal silicon ha...

Embodiment 3

[0075] The preparation of embodiment 3 soft carbon negative electrode material

[0076] Step (1): Polymerize coal tar at 700°C for 30 hours to obtain mesophase carbon microspheres;

[0077] Step (2): The mesocarbon microspheres were fused at 65° C. for 4 minutes, then pulverized with a pulverizer at a speed of 400 rpm, passed through a 200-mesh sieve, and the under-sieve was taken in an inert atmosphere at Carry out pre-carbonization treatment at 550°C for 32 hours to obtain a carbon precursor;

[0078] Step (3): The carbon precursor is pulverized with a pulverizer at a speed of 650 rpm, and then classified by a classifier with a frequency of 250 Hz to obtain a carbon precursor with a volume average particle diameter D50 of 15.3 μm. body particles, the carbon precursor particles were carbonized and heat-treated at 1800°C for 45 hours in an inert atmosphere to obtain carbonized particles;

[0079] Step (4): The carbonized particles were mixed with single crystal silicon havin...

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Abstract

The invention discloses a soft carbon negative electrode material as well as a preparation method and application thereof. The soft carbon negative electrode material comprises carbonized particles and monocrystalline silicon; and the preparation method comprises the following steps: (1) carrying out polymerization reaction on coal tar to obtain mesocarbon microbeads; (2) carrying out fusion on the mesocarbon microbeads, then carrying out crushing treatment, and then carrying out low-temperature carbonization treatment to obtain a carbon precursor; (3) crushing the carbon precursor, and carrying out high-temperature carbonization treatment to obtain carbonized particles; and (4) mixing the carbonized particles with monocrystalline silicon to prepare the soft carbon negative electrode material. The soft carbon negative electrode material disclosed by the invention is high in compaction density, high in electrochemical performance and high in cycle performance; the preparation method issimple, convenient and feasible, and the raw material cost is relatively low; and the lithium ion battery prepared from the soft carbon negative electrode material is high in safety performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a soft carbon negative electrode material and its preparation method and application. Background technique [0002] At present, electric vehicles generally include electric vehicles (EVs) driven by electric motors and hybrid electric vehicles (HEVs) driven by a combination of engines and electric motors. Among them, hybrid electric vehicles (HEVs) are characterized by economy and low fuel consumption. Therefore, unlike lithium-ion batteries in existing small portable devices, lithium-ion batteries for electric vehicles require better high-current charge and discharge performance and higher safety. [0003] Lithium-ion batteries have excellent performance in terms of small size, light weight, no pollution, fast charge and discharge, and long cycle life. At present, commercially applied anode materials include artificial graphite, nat...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/587H01M10/0525
CPCH01M4/386H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 谢秋生董爱想陈然刘盼
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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