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Metal lithium-framework carbon composite material and preparation method thereof, negative electrode and secondary battery

A carbon composite material, secondary battery technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc. The effect of suppressing the formation of dendrites

Active Publication Date: 2016-03-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of melting and emulsification is used to prepare lithium metal particles. This method requires vigorous stirring (>10000rpm). After the emulsification is completed, multiple washings are required. The steps are cumbersome and the preparation process is relatively demanding on equipment.

Method used

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  • Metal lithium-framework carbon composite material and preparation method thereof, negative electrode and secondary battery
  • Metal lithium-framework carbon composite material and preparation method thereof, negative electrode and secondary battery
  • Metal lithium-framework carbon composite material and preparation method thereof, negative electrode and secondary battery

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preparation example Construction

[0032] Another aspect of the embodiment of the present application provides a method for preparing carbon nanotube microspheres, comprising: at least uniformly dispersing carbon nanotubes in a solvent to form a surfactant-free dispersion and then spray-drying to obtain the carbon nanotube microspheres.

[0033] The shape of the carbon nanotube microsphere material can be powder or granular.

[0034]More specifically, as one of the feasible embodiments of the present invention, the preparation method may include: at least dispersing the carbon nanotubes in a solvent to obtain a dispersion without surfactant, and then inputting the dispersion into the mist of the spray dryer In the atomizer, and form tiny mist droplets, and make the mist droplets contact with the hot air flow in the spray dryer, so that the solvent in the liquid mist droplets evaporates rapidly, and then the The carbon nanotubes in the liquid mist are aggregated to form carbon nanotube microspheres, and then th...

Embodiment 1

[0058] First weigh 200mg of battery-grade lithium metal and 200mg of commercial porous carbon (average pore size 2.6nm) into a heater that is inert to lithium metal, heat to the melting temperature of lithium metal, stir vigorously, and continue for several minutes. During the mixing process, pores are found Carbon cannot be used as a carrier to absorb molten metal lithium, and the formed complex is in a block shape, indicating that the average pore size is too small to effectively absorb molten metal lithium.

Embodiment 2

[0060] First weigh 200mg of battery-grade lithium metal and 200mg of commercial acetylene black (average pore size 14.4nm) into a heater that is inert to lithium metal, heat to the melting temperature of lithium metal, stir vigorously for 6-8 minutes, and the mixing is over Afterwards, the temperature was lowered to room temperature, and the whole process was carried out in an argon atmosphere.

[0061] Metal lithium-acetylene black microspheres were obtained, wherein the metal lithium loading was 8.0%.

[0062] Use the material obtained above as the negative electrode of the lithium battery:

[0063] The cathode material of lithium ion battery is LiFePO 4 :PVFD:AB=88:5:7, the thickness is 150um, the electrolyte is 1mol / LLiPF 6 / EC-DMC (1:1vol), assembled into a button battery (CR2025), cycled 25 times, the coulombic efficiency of the battery was not high during the whole cycle, and the coulombic efficiency tended to be stable as the cycle progressed. figure 1 A schematic d...

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Abstract

The present application discloses a metal lithium-framework carbon composite material preparation method, which comprises: uniformly mixing metal lithium having a molten state and a porous carbon material carrier, and cooling to obtain the metal lithium-framework carbon composite material. The invention further discloses a metal lithium-framework carbon composite material, a secondary battery negative electrode, a secondary battery and a metal-framework carbon composite material. According to the present invention, with the prepared metal lithium-framework carbon composite material, the dendritic crystal formation can be inhibited, the whole property of the battery can be improved, and the high specific capacity and the good cycle performance are provided.

Description

technical field [0001] The application belongs to the field of energy batteries, and in particular relates to a metal lithium-skeleton carbon composite material, a preparation method thereof, a negative electrode and a secondary battery. Background technique [0002] Lithium batteries have the advantages of high energy density, good cycle performance, and environmental friendliness, and are widely used in transportation, communication, electronic equipment and other fields. [0003] The currently used lithium batteries are mainly lithium-ion batteries. The working principle is that lithium ions are extracted and clamped in the positive and negative electrode materials. Commercial lithium-ion batteries use graphite as the negative electrode. The low capacity of the graphite negative electrode has always been criticized. During the charging process Lithium ions are extracted from the positive electrode and inserted into the negative electrode. During discharge, lithium ions ar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/13H01M10/0525
CPCY02E60/10
Inventor 王亚龙杜兆龙卢威陈立桅吴晓东
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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