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High-capacity silicon-copper/carbon composite cathode material of lithium ion battery and production process thereof

A technology of lithium ion battery and negative electrode material, which can be applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as unsatisfactory electrochemical performance.

Inactive Publication Date: 2012-11-28
耿世达
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But overall, the electrochemical performance is still not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 85 kg of natural graphite powder with a carbon content of 96% into the nano high temperature and high pressure steam mixer.

[0022] Put 5 kg of nano-silica powder, 5 kg of nano-copper powder and 5 kg of nano-pitch into different feed ports of the nano-high temperature and high-pressure steam mixer, and use water vapor, hydrochloric acid steam and ethanol steam to make the materials and 85 kg The natural graphite powder is mixed, the steam temperature range is 150-200 ° C, the stirring speed is 60 rpm, the heating rate is 100 ° C per hour, the controlled temperature reaches 1500 ° C, the controlled pressure is 10 MPa, and then the heat preservation and pressure holding time is 10 hours. Block composites.

[0023] Use a pulverizer to pulverize the bulk composite material into a powder of 5-50um, which is the negative electrode material of the lithium ion battery, with a capacity of 580mAh / g and a capacity retention of 81% after 300 cycles.

Embodiment 2

[0025] Add 80 kg of artificial graphite powder with a carbon content of 98% into the nanometer high temperature and high pressure steam mixer.

[0026] Put 10 kg of nano silicon powder, 5 kg of nano copper powder and 5 kg of nano asphalt into different feed ports of the nano high temperature and high pressure steam mixer, use water vapor, hydrochloric acid steam and ethyl acetate steam to make the materials and 80kg of artificial graphite powder is mixed, the steam temperature range is 100-150°C, the stirring speed is 90 rpm, the heating rate is 200°C per hour, the control temperature reaches 1400°C, the control pressure is 15MPa, and then the heat preservation and pressure holding time is 15 hours , to obtain bulk composites.

[0027] Use a pulverizer to pulverize the bulk composite material into a 5-50um powder, which is the negative electrode material of the lithium ion battery, with a capacity of 589mAh / g and a capacity retention of 82.5% after 300 cycles.

Embodiment 3

[0029] Add 60 kg of resin carbon powder with a carbon content of 99% into the nano high temperature and high pressure steam mixer.

[0030] Put 20 kg of nano-silicon powder, 10 kg of nano-copper powder and 10 kg of nano-pitch into different feed ports of the nano-high temperature and high-pressure steam mixer, and use water vapor, sulfuric acid steam and acetone steam to make the materials and 60 kg The resin carbon powder is mixed, the steam temperature range is 100-300 ° C, the stirring speed is 120 rpm, the heating rate is 150 ° C per hour, the control temperature reaches 1500 ° C, the control pressure is 20 MPa, and then the heat preservation and pressure holding time is 20 hours. Block composites.

[0031] Use a pulverizer to pulverize the bulk composite material into 5-50um powder, which is the negative electrode material of the lithium ion battery. The capacity is 592mAh / g, and the capacity after 300 cycles is maintained at 81.6%.

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Abstract

The invention relates to a high-capacity silicon-copper / carbon composite cathode material of a lithium ion battery and a production process. The production process comprises the following steps of: mixing nano-silicon powder, nano-copper powder, nano-asphalt and a carbon material in a nano high-temperature high-pressure steam blender to obtain a mixture; and smashing the mixture into powder with the particle size of 5 to 50mu m to obtain the cathode material of the lithium ion battery. The cathode material of the lithium ion battery prepared by the process has the advantages of capacity of more than 578 mAh / g and maintained capacity of over 80 percent after 300 times of circulation.

Description

technical field [0001] The invention relates to a lithium-ion battery high-capacity negative electrode material and a production process, in particular to a lithium-ion battery high-capacity silicon-copper / carbon composite negative electrode material and a production process. Background technique [0002] With the gradual depletion of major natural resources such as coal and oil, the energy crisis has become one of the major issues that human beings must solve in the future. People's demand for new energy is getting higher and higher, lithium-ion batteries are being used more and more widely, and have become one of the new chemical power sources with great development potential in the 21st century. [0003] Lithium-ion batteries are a new generation of batteries following nickel-hydrogen batteries since the 1990s. Because of their advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, they have become the cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/38
CPCY02E60/122Y02E60/10
Inventor 耿世达
Owner 耿世达