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US 8,568,924 B2Granted
Modified battery anode with carbon nanotubes
AssigneeCNano Technology Limited
InventorsJun Ma, Zhaojie Wei, Guanghui Feng, Bin He, Gang Xu, Tao Zheng
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Abstract
An improved anode material for a lithium ion battery is disclosed. The improved anode material can improve both electric conductivity and the mechanical resilience of the anode, thus drastically increasing the lifetime of lithium ion batteries.
Claims12
A method for preparing a composite material for anode of a lithium ion battery, comprising:
- dispersing carbon nanotubes in a binder material to form a mixture of carbon nanotubes and the binder material;
- liquefying the mixture containing carbon nanotubes dispersed in the binder to form a paste;
- mixing graphite particles with the paste containing the carbon nanotubes;
- coating surfaces of the graphite particles with the paste containing the carbon nanotubes;
- carbonizing the paste mixed with the graphite particles;
- after the step of carbonizing, graphitizing the carbon nanotubes and the graphite particles;
- bonding the carbon nanotubes to the graphite particles to form a carbon-carbon composite;
- and
- forming at least a part of an anode in a lithium ion battery using the carbon-carbon composite.
6 more elements
The method of claim , wherein the carbon nanotubes are dispersed with the binder material using a twin screw extruder, a three-roll mill, a high shear mixer, a jet mill, or a ball mill.
Dependencies are inferred from the claim text.