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Anode composite material, and preparation method thereof

A composite material and anode technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of large irreversible capacity loss and failure to become a high-energy density battery, so as to avoid large-sized dendrites, improve ion conductivity, and strong The effect of absorbency

Active Publication Date: 2017-04-19
赛福纳米科技(徐州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the theoretical capacity of graphite is only 372mAh / g, and the first charge and discharge cycle will produce a large irreversible capacity loss, it cannot be a high energy density battery

Method used

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  • Anode composite material, and preparation method thereof
  • Anode composite material, and preparation method thereof
  • Anode composite material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Prepare 800g of copper powder as a raw material, with a particle size of less than 500nm; 200g of carbon nanotube dry powder, with a diameter of 20-120nm and a length of 2-20μm. Copper powder and carbon nanotube dry powder were uniformly mixed under vacuum conditions, pressed at 250 MPa at 200° C., and kept under pressure for 1 hour. Then it was moved to a tube furnace, and under the protection of hydrogen, it was first raised to 350°C at a rate of 4°C / min, kept for 4 hours, then rapidly raised to 900°C at 18°C / min, kept for 1 hour, and then cooled naturally with the furnace. That is, the C-Cu composite material in which carbon nanotubes are uniformly dispersed in the copper matrix is ​​obtained, and rolled to a thickness of about 0.9mm under the protection of high-temperature inert gas (argon), that is, a C-Cu composite current collector is obtained, in which the carbon nanotubes The tube content is 50 vol.%.

Embodiment 2

[0031]Prepare 800g of copper powder as a raw material, with a particle size of less than 500nm; 200g of carbon nanotube dry powder, with a diameter of 20-120nm and a length of 2-20μm. Copper powder and carbon nanotube dry powder were uniformly mixed under vacuum conditions, pressed at 200° C. at 250 MPa and held for 1 hour. Then it was moved to a tube furnace, and under the protection of hydrogen, it was first raised to 350°C at a rate of 4°C / min, kept for 4 hours, then rapidly raised to 900°C at 18°C / min, kept for 1 hour, and then cooled naturally with the furnace. That is, the C-Cu composite material in which carbon nanotubes are uniformly dispersed in the copper matrix is ​​obtained, and rolled to a thickness of about 0.9mm under the protection of high-temperature inert gas (argon), that is, a C-Cu composite current collector is obtained, in which the carbon nanotubes The tube content is 50 vol.%.

[0032] Vacuum-evaporate lithium on the surface of C-Cu composite current c...

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Abstract

The invention discloses an anode composite material, and a preparation method thereof. The anode composite material is prepared via combination of a C-Cu composite current collector, and metal M (M=Li, Na, Mg, or Al), and possesses a C-Cu-CuM-M laminated structure. According to the preparation method, nanocarbon-copper is taken as the current collector, and metal lithium (or sodium, magnesium, and aluminium) is deposited onto the surface of the current collector, so as to prepare a combined electrode with high heat conduction performance, electric conduction performance, and mechanical strength; and in addition, utilization of the excellent liquid absorbing capacity of nanocarbon is adopted to reduce concentration polarization, improve ion conductive ability of the combined electrode, avoide generation of metallic dendrite effectively, and improve the safety and reliability of corresponding secondary batteries effectively.

Description

technical field [0001] The invention belongs to the field of new energy battery materials, and in particular relates to an anode composite material and a preparation method thereof. Background technique [0002] In the research of new high-energy power sources, the research of metal lithium secondary batteries was carried out very early. As early as 1972, the American Exxon company launched the Li / TiS 2 Secondary battery, the Canadian Moli company launched Li / MoS in the late 1980s 2 secondary battery. However, since metal lithium electrodes are prone to lithium dendrites during charging and discharging, if lithium dendrites fall off from the plate, the electrical contact with the plate will be broken after falling off, and they cannot be used for charging and discharging reactions, resulting in a decrease in battery capacity; If the crystal gradually grows, it will pierce the separator and extend to the positive electrode, causing an internal short circuit, causing fire or...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/366Y02E60/10
Inventor 肖伟李红董明
Owner 赛福纳米科技(徐州)有限公司
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