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Soft carbon negative material of lithium ion battery, preparation method of soft carbon negative material and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as lack of Coulombic efficiency

Active Publication Date: 2014-04-09
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN103050699A discloses a method for preparing a soft carbon negative electrode material for a lithium ion battery, comprising the following steps: mixing a catalyst with asphalt; raising the temperature to 180-380°C, and reacting for at least 0.7 hours; raising the temperature to 320-600°C, and reacting for at least 0.3 hours, Obtaining the mesophase spherical primary product; removing impurities and drying the mesophase spherical primary product to obtain a soft carbon-like carbon microsphere mesophase precursor; combining the soft carbon-like carbon microsphere mesophase precursor with nitrogen-containing compounds and / or containing The boron compound is mixed and left to stand; under a protective atmosphere, the temperature is raised to 400-1600°C, and the pyrolysis treatment is performed for at least 0.6 hours to obtain a soft carbon negative electrode material. Although the inventive material greatly reflects the capacity of the existing soft carbon materials, The first Coulombic efficiency is still largely lacking (<84%)

Method used

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  • Soft carbon negative material of lithium ion battery, preparation method of soft carbon negative material and lithium ion battery
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Embodiment 1

[0061] The non-graphitized mesophase carbon microspheres (Tianjin Betray) with a carbon content of not less than 98% are ball-milled to a particle size of 1.0-60.0 μm, and then placed in a roller kiln with argon protective gas at 20.0°C / min to 1550.0°C, heat preservation for 0.5h, and naturally cooled to room temperature to obtain the first modified soft carbon material; SiO with a particle size of 1-300nm 0.5 (Si and SiO can be used 2 mixture) and the first modified soft carbon material are dispersed in alcohol at a mass ratio of 5:95, and spray-dried to obtain the second modified soft carbon material; The powder is placed in a VC high-efficiency mixer with a mass ratio of 10:1, the speed is adjusted to 500.0r / min, and mixed for 0.5h, then placed in a roller kiln and fed with nitrogen gas to raise the temperature to 1050.0°C at 0.5°C / min, and keep warm at 10.0°C h, naturally cooled to room temperature, crushed, sieved, and demagnetized to obtain a new type of high-capacity ...

Embodiment 2

[0063] The non-graphitized needle coke (Shenzhen Beiterui) with a carbon content of not less than 98% is ball-milled to a particle size of 1.0-60.0 μm, and then placed in a roller kiln with argon protection gas at 0.5°C / min Raise the temperature to 350.0°C, keep it warm for 10.0h, and cool naturally to room temperature to obtain the first modified soft carbon material; place the first modified soft carbon material in a rotary furnace, adjust the rotation speed to 0.5r / min, and pass in nitrogen protection The temperature of the gas is raised to 1150.0°C at 10.0°C / min, and then SiO is introduced 2 Sublimation steam with Si mixture, the flow rate is 0.1L / min, keep warm for 5.0h, and naturally cool to room temperature to obtain a layer of 1~300nm monodisperse SiO x The second modified soft carbon material of nanoparticles; the second modified soft carbon material and citric acid powder are dispersed in alcohol at a mass ratio of 10:1, spray-dried, and then placed in a pusher kiln ...

Embodiment 3

[0065] The non-graphitized needle coke (Shenzhen Beiterui) with a carbon content of not less than 98% is ball-milled to a particle size of 1.0-60.0 μm, and then placed in a roller kiln with argon protection gas at 10.0°C / min Raise the temperature to 1100.0°C, keep it warm for 3.5 hours, and cool naturally to room temperature to obtain the first modified soft carbon material; put SnO with a particle size of 1-500nm and the first modified soft carbon material in a fusion machine at a mass ratio of 6:94 In the process, the rotating speed is adjusted to 3000.0r / min, the tool gap width is 0.05cm, and the fusion is at least 1.0h to obtain the second modified soft carbon material; the second modified soft carbon material is placed in the rotary furnace, and the rotation speed is adjusted to 0.5 r / min, nitrogen protection gas was introduced and the temperature was raised to 900.0 °C at 5.0 °C / min, then methane gas was introduced at a flow rate of 2.0 L / min, kept for 5.0 h, naturally co...

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Abstract

The invention relates to the field of negative materials of lithium ion batteries and particularly relates to a novel high-volume soft carbon negative material, a preparation method thereof and a lithium ion battery utilizing the soft carbon negative material. The soft carbon negative material comprises a soft carbon powder particle kernel, a nanometer material coating and a conductive carbon layer, wherein the nanometer material coating is loaded on a surface layer of the soft carbon powder particle kernel in a monodisperse manner, and the outer surface of the nanometer material coating is coated by the conductive carbon layer. The soft carbon negative material has high volume and initial charge-discharge efficiencies and excellent rate capability and cycle performance. The soft carbon anode material is prepared by the steps of with soft carbon powder as a ram material, sequentially carrying preburning, nanometer material spraying and conductive carbon layer coating. The preparation method is simple and is easy to control, the manufacturing cost is low, and the scale production is easy to realize.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a novel high-capacity soft carbon negative electrode material, a preparation method thereof, and a lithium ion battery using the soft carbon negative electrode material. Background technique [0002] At present, commercial lithium-ion battery anode materials are mainly graphite-based carbon materials, such as artificial graphite, natural graphite, and mesocarbon microspheres. However, graphite-based anode materials are difficult to keep up with the miniaturization of electronic equipment, vehicles and electric tools due to their low specific capacity (372mAh / g), poor high-rate charge and discharge performance, and safety issues caused by lithium deposition. With the pace of demand for high power and high capacity of lithium-ion batteries, it is necessary to develop new lithium-ion battery anode materials that can replace current graphite mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M4/587H01M10/0525
CPCY02E60/122Y02E60/10H01M4/1393H01M4/583H01M4/587H01M10/0525
Inventor 岳敏余德馨李胜任建国
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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