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Lithium ion cell composite anode material and preparing process thereof

A composite positive electrode material and lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as poor charge and discharge rate characteristics

Inactive Publication Date: 2005-10-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore LiFePO 4 Limited to work at a small current density, the charge and discharge rate characteristics are poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First LiCoO 2 Powder, polyvinylidene fluoride (PVDF), single-walled carbon nanotubes, and carbon black are mixed in a mass ratio of 84:10:3:3, and the mixture is dissolved in N-methylpyrrolidone (NMP) solvent to form slurry, and keep stirring until the slurry is evenly mixed, then coat the slurry on aluminum foil, dry it at 80°C for 2 hours, roll it, punch it, and then put it in a vacuum oven with a pressure of -0.1Mpa and a temperature of 120 °C for 12 hours to obtain the final electrode membrane.

Embodiment 2

[0021] LiNi 0.8 co 0.2 o 2 Powder, polytetrafluoroethylene (PTFE), carbon black, and multi-walled carbon nanotubes are mixed in a mass ratio of 86:8:3:3, and the mixture is dissolved in N-methylpyrrolidone (NMP) solvent to form a slurry Stir continuously until the slurry is evenly mixed, then coat the slurry on aluminum foil, dry at 80°C for 2 hours, roll and punch, and then put it in a vacuum oven at a pressure of -0.1Mpa and a temperature of 120°C The final electrode membrane can be obtained by drying under certain conditions for 12 hours.

Embodiment 3

[0023] LiNi 0.7 co 0.3 o 2 Powder, polyvinylidene fluoride (PVDF), and single-walled carbon nanotubes are mixed in a mass ratio of 87:8:5, and the mixture is dissolved in N-methylpyrrolidone (NMP) solvent to form a slurry, and continuously Stir until the slurry is evenly mixed, then coat the slurry on aluminum foil, dry at 80°C for 2 hours, roll and punch, and then dry in a vacuum oven at a pressure of -0.1Mpa and a temperature of 120°C The final electrode membrane can be obtained in 12 hours.

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Abstract

This invention relates to a Li ionic battery positive material and its preparation method. Said material contains Li transition metal oxide, carbon nm-tube, black carbon and an adhesive mixed in the quality ratio of 80-90%, 3-10%, 0-8% and 3-10% and mixed to a slurry after dissolved by an organic solvent then to be coated on the Al foil to be rolled and dried in vacuum to get the electrode membrane, which gets the advantages of high capacity, high circulation stability and high charge / discharge multiplying factor.

Description

technical field [0001] The invention relates to a preparation method of a high-capacity lithium-ion battery positive electrode material capable of rapid charge and discharge, in particular to a composite positive electrode material prepared by using lithium-containing transition metal oxides and carbon nanotubes, and is especially suitable for high-power and high-current charge-discharge application conditions The invention belongs to the technical field of functional ceramics and chemical power supply. Background of the invention [0002] Lithium-ion batteries are widely used in mobile electronic appliances, such as mobile phones, cameras, notebook computers, etc. Compared with traditional batteries, they have the advantages of high energy density, low self-discharge rate, high discharge voltage and no memory effect. As lithium-ion batteries are expected to be popularized and applied in electric vehicles or power storage power supplies, the price of batteries seriously rest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李新禄康飞宇施秀娟郑永平沈万慈
Owner TSINGHUA UNIV
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