Preparation method of high-capacity anode material

A negative electrode material and high-capacity technology, which is applied in the field of preparation of high-capacity negative electrode materials for lithium-ion batteries, can solve the problems that the performance of composite materials is difficult to be greatly improved, it is difficult to insert Si and Sn, and the irreversible capacity is high, so as to achieve excellent cycle Performance, improvement of cycle performance, effect of reducing volume effect

Active Publication Date: 2016-04-13
TIANJIN NORMAL UNIVERSITY
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  • Application Information

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Problems solved by technology

However, the sample prepared by ball milling for 20 hours has a larger specific surface area due to the destruction of the structure of the mesophase carbon microspheres, which can form more SEI films, resulting in high irreversible capacity and low capacity retention.
It

Method used

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  • Preparation method of high-capacity anode material
  • Preparation method of high-capacity anode material
  • Preparation method of high-capacity anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] First, add 250 grams of nano-silica powder to 5 kg of petroleum asphalt, raise the temperature to 200°C, stir at high speed for 1 hour, then raise the temperature to 400°C, keep the temperature constant for 2 hours, wash, separate and dry, then put it into the atmosphere furnace, 800°C After carbonization for 1 hour, a core-shell structure composite material with a particle size distribution of 6 μm was obtained, and the nano silicon powder was completely coated in the mesophase carbon microspheres.

Embodiment 2

[0037] Add 25 grams of nano-silicon powder and 100 grams of mesocarbon microspheres into a 500ml ball mill tank with a ball-to-material ratio of 3:1, and ball mill for 2 hours at a speed of 400 rpm to obtain a silicon-mesophase carbon microsphere composite material. The phase carbon microspheres are broken, and most of the nano-silica powder is attached to the surface of the mesophase carbon microspheres.

Embodiment 3

[0039] First, add 250 grams of nano-silicon and 250 grams of nano-tin monoxide powder into a mixture of 1 kg of coal tar pitch, 2 kg of petroleum pitch and 2 kg of heavy oil, raise the temperature to 250 ° C, stir at high speed for 1 hour, and then raise the temperature to 400 ° C , kept at a constant temperature for 8 hours, washed, separated and dried, then placed in an atmosphere furnace, and carbonized at 900°C for 1 hour to obtain a core-shell structure composite material with a particle size distribution of 18 μm. The nano-tin dioxide powder was completely coated in the mesophase carbon particles in the ball.

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Abstract

The invention relates to a preparation method of a high-capacity anode material, in particular to a method for synthesizing a high-capacity core-shell structure anode material for a lithium-ion battery. The method comprises the following steps: firstly, adding high-capacity nano-particles to raw materials of synthesizing mesocarbon microbeads, and carrying out high-speed stirring and high-temperature polymerization; with the high-capacity nano-particles as a core, generating the mesocarbon microbeads on the surface through polymerization of polycyclic aromatic molecules; and finally obtaining the high-capacity core-shell structure anode material with the high-capacity nano-particles as the core and the mesocarbon microbeads as the shell through high-temperature carbonization. Compared with a traditional synthesis process, the preparation method has the advantages ofachieving uniform coating, simple in process, excellent in electrochemical properties and the like.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and mainly relates to a preparation method of a high-capacity negative electrode material for lithium-ion batteries. Background technique [0002] At present, the anode materials for commercial lithium-ion batteries are mainly graphite carbon, and the reversible specific capacity of carbon materials has reached 360mAh / g, which is close to its theoretical specific capacity of 372mAh / g. In order to further improve the energy density of lithium-ion batteries, new high-capacity anode materials have become a hot topic of related research. The alloy materials formed by Si, Sn, Al, etc. and Li have a reversible lithium storage capacity much higher than that of graphite negative electrodes. Among them, silicon and tin have high theoretical specific capacity, low lithium intercalation and extraction potential and low price. Advantages, become the focus and hotspot of lithium-ion battery resea...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/387H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 张波李德军郭志杰
Owner TIANJIN NORMAL UNIVERSITY
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