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Modified battery anode with carbon nanotubes

A technology of carbon nanotubes and battery negative electrodes, which is applied in the field of lithium-ion battery technology and nanomaterials, and can solve problems such as battery failure, negative electrode loss, and negative electrode material rupture.

Active Publication Date: 2013-04-17
JIANGSU CNANO TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion and contraction during the charge-discharge cycle will cause the negative electrode material to crack (collapse) or delaminate, which will irreparably cause the negative electrode to lose electrical contact with the current collector and cause the battery to fail

Method used

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  • Modified battery anode with carbon nanotubes
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1. Mixing carbon nanotubes and mesophase pitch by solid pulverization

[0052] In this example, the carbon nanotubes and pitch pieces were first conveyed into a jet mill at a ratio of 1 / 10. Pulverization is then carried out at a rotational speed higher than 45 Hz. After crushing, the carbon nanotubes can be seen mixed with powdered pitch particles.

Embodiment 2

[0053] Example 2. Mixing carbon nanotubes and pitch by liquid processing

[0054] Although pitch is not uniform in chemical composition, it is soluble in many solvents, including xylene, among others. In a container, a predetermined amount of bitumen is first mixed with xylene. The amount of asphalt added in xylene is about 20%. When all the pitch particles were dissolved in the solvent, carbon nanotubes were added to the solution at a ratio (CNT / pitch) of 1 / 5 (20% carbon nanotubes in the paste). The resulting paste is then sent to a ball mill or three-roll mill for further dispersion.

Embodiment 3

[0055] Example 3. Mixing of carbon nanotubes and epoxy resin by twin screw extruder

[0056] The twin-screw extruder is a general-purpose mixing machine used in the plastics industry. The prior art has disclosed techniques for dispersing carbon nanotubes in plastics and epoxy resins. Typically, carbon nanotubes and epoxy resin are fed into a twin-screw extruder from separate inlets. The melted epoxy resin moves the carbon nanotubes to the dispersion area, where the designed helical structure generates a suitable shear force to open the agglomerated carbon nanotubes and disperse them in the epoxy resin. The molten epoxy resin containing dispersed carbon nanotubes is eventually extruded out of the device and cut into pellets after cooling to cryogenic temperatures.

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Abstract

A modified battery anode with carbon nanotubes is disclosed. The anode includes graphite particles and carbon nanotubes, the carbon nanotubes are bonded to the surfaces of the graphite particles through atom bonds. The method includes the steps as following: the carbon nanotubes are dispersed in a mixture formed by a binding material; the mixture is liquified to a mushy material, the graphite particles are mixed with the mushy material, the surfaces of the graphite particles are coated by the mushy material, the mushy material mixed with graphite particles is processed by carbonization, the carbon nanotubes and the graphite particles are processed by graphitization, carbon-carbon compounds are formed, the carbon nanotubes are bonded to the surface of the graphite particles, and the carbon-carbon compounds play as at least a part of the lithium ion battery anode. 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.

Description

technical field [0001] The invention belongs to the technical fields of lithium-ion batteries and nanometer materials, and in particular relates to a negative electrode of lithium-ion batteries modified with carbon nanotubes. Background technique [0002] The content disclosed in the present invention relates to improving the performance of lithium-ion battery negative electrode materials. [0003] Lithium-ion batteries are widely used because of their high energy density, low memory effect and low power loss in standby. The positive electrode of traditional lithium-ion batteries uses lithium composite oxides, such as lithium cobaltate, lithium iron phosphate, lithium manganate, etc., and the negative electrode uses carbon or graphite. One problem with lithium batteries is that the lithium alloy expands and contracts during charge and discharge cycles. For example, some lithium alloys can expand by 300% when fully charged. The expansion and contraction during the charge-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M10/0525
CPCH01M4/0471H01M4/133H01M4/1393H01M4/587H01M4/622H01M10/0525Y10T29/49108Y10T29/49115Y02E60/10
Inventor 马军魏兆杰冯广辉何斌许刚郑涛
Owner JIANGSU CNANO TECHNOLOGY CO LTD
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