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Preparation method of silicon intermediate-phase carbon microsphere for lithium ion battery

A technology of mesocarbon microspheres and lithium-ion batteries, which is applied in the field of preparation of lithium-ion battery materials, can solve problems such as the inability to effectively eliminate the volume expansion effect of silicon, and achieve the effect of solving low specific capacity

Inactive Publication Date: 2018-03-06
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The silicon / mesocarbon microsphere negative electrode prepared by physical methods cannot effectively eliminate the volume expansion effect of silicon

Method used

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  • Preparation method of silicon intermediate-phase carbon microsphere for lithium ion battery

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Effect test

Embodiment 1

[0022] Mix elemental silicon (particle size 50nm) and coal tar pitch at a ratio of 1:30, and disperse them using ultrasonic waves. After cooling down to room temperature at a cooling rate of min, mesophase carbon microspheres were obtained by precipitation separation. Under a nitrogen protective atmosphere, the temperature was raised to 800° C. at a heating rate of 8° C. / min, then kept at a temperature of 3 hours, and then naturally cooled to room temperature to obtain silicon mesocarbon microspheres for lithium-ion batteries.

Embodiment 2

[0024] Mix silicon-containing oxides (particle size 50nm) and coal tar pitch at a ratio of 1:60, and disperse them using ultrasonic waves. The pressure of the reactor is 1Mpa, and the heating rate is 5°C / min. After the cooling rate of ℃ / min is reduced to room temperature, the mesophase carbon microspheres are obtained by precipitation separation method. Under a nitrogen protective atmosphere, the temperature was raised to 950° C. at a rate of 11° C. / min, then kept for 5 hours, and cooled naturally to room temperature to obtain silicon mesocarbon microspheres for lithium-ion batteries.

Embodiment 3

[0026] Mix elemental silicon (particle size 80nm) and petroleum asphalt at a ratio of 1:90, and disperse by ultrasonic waves. The pressure of the reactor is 5Mpa, the heating rate is 8°C / min, and the temperature is raised to 480°C. After cooling down to room temperature at a cooling rate of min, mesophase carbon microspheres were obtained by precipitation separation. Under a nitrogen protective atmosphere, the temperature was raised to 1100° C. at a rate of 15° C. / min, then kept for 8 hours, and naturally cooled to room temperature to obtain silicon mesocarbon microspheres for lithium-ion batteries.

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Abstract

The invention provides a preparation method of a silicon intermediate-phase carbon microsphere for a lithium ion battery. An intermediate-phase carbon microsphere blank sphere taking silicon as a coreis obtained by adding elemental silicon or a silicon-containing oxide into a raw material and performing uniform mixing, thermal polycondensation and separation, and the intermediate-phase carbon microsphere taking the silicon as the core for the lithium ion battery is obtained by carbonization. The intermediate-phase carbon microsphere taking the silicon as the core is grown and prepared by taking the silicon or the silicon-containing oxide as a crystal nucleus, and the problem of low specific capacity of a conventional intermediate-phase carbon microsphere is solved on the premise of no influence on advantage and performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material, in particular to a preparation method of a silicon mesophase carbon microsphere for a lithium ion battery. Background technique [0002] Lithium-ion batteries are favored for their excellent properties such as high capacity, high voltage, high cycle stability, high energy density and no pollution to the environment. Due to the high packing density, mesocarbon microspheres can be tightly packed; the layered molecular structure is arranged in parallel, which is conducive to the intercalation and intercalation of lithium ions, and can support high-current charging and discharging. It is widely used in lithium-ion battery anode materials. However, the mesophase carbon microspheres have an inherent defect, that is, the specific capacity is low (340mAh / g). As a negative electrode material, silicon has the advantage of high specific capacity (4200mAh / g), but its significant disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/625Y02E60/10
Inventor 肖志平皮涛黄越华邵浩明黎剑锋李能
Owner HUNAN SHINZOOM TECH