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Preparation method of self-supporting flexible composite electrode material used by lithium ion battery

A lithium-ion battery and composite electrode technology, which is applied in the field of electrode materials and composite electrode materials, can solve the problems of battery capacity drop, low conductivity, etc., and achieve the effect of avoiding capacity loss

Inactive Publication Date: 2015-09-23
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its own low conductivity and large volume changes during the long-term intercalation or deintercalation of lithium ions will cause a sharp drop in battery capacity.

Method used

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  • Preparation method of self-supporting flexible composite electrode material used by lithium ion battery
  • Preparation method of self-supporting flexible composite electrode material used by lithium ion battery
  • Preparation method of self-supporting flexible composite electrode material used by lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The self-supporting composite electrode material was prepared by adding graphene oxide / carbon nanotube / metal manganese complex at a mass ratio of 2:1:7, and its electrochemical lithium storage performance was measured. The specific steps are as follows:

[0024] (1) Prepare a 0.6 mg / ml graphene oxide ethanol solution.

[0025] (2) Take 0.0238g of manganese complex nanofibers into a beaker, add 50mL of ethanol, put it into ultrasonic dispersion for 30min, then stir on a magnetic stirrer for 2h to ensure that the manganese salt is evenly dispersed in the solution, and then take 7.5ml of graphene oxide solution and 18ul of 7.5wt% carbon nanotube aqueous dispersion were added to the beaker, followed by stirring for 2 hours to allow the substances in the solution to be evenly distributed, and then suction-filtered to form a film.

[0026] (3) The film was placed in a laser calciner and calcined with a 2.4 W laser for 5 seconds to prepare a self-supporting flexible composite ...

Embodiment 2

[0029] Prepare the self-supporting composite electrode material by adding graphene carbon nanotubes and manganese salt at a mass ratio of 2:2:6, and measure its electrochemical lithium storage performance. The specific steps are as follows:

[0030] (1) Prepare 0.6 mg / ml graphene oxide isopropanol solution.

[0031] (2) Add 0.0208g of manganese complex nanofibers into a beaker, add 30 ml of ethanol to the beaker, put it into ultrasonic dispersion for 30 minutes, and then stir on a magnetic stirrer for 2 hours to ensure that the manganese salt is evenly dispersed in the solution , and then respectively take 7.5ml of graphene oxide solution and 36 ul of 7.5 wt% carbon nanotube aqueous dispersion into the beaker, then stir for 2 h to allow the substances in the solution to be evenly distributed, and then filter to form a film.

[0032] (3) The film was placed in a laser calciner and calcined with a 2.4 W laser for 10 seconds to prepare a self-supporting flexible composite electro...

Embodiment 3

[0036] Prepare a self-supporting composite electrode material by adding graphene carbon nanotubes and manganese salt at a mass ratio of 2:3:5, and measure its electrochemical lithium storage performance. The specific steps are as follows:

[0037] (1) Prepare a 0.6 mg / ml graphene oxide ethanol solution.

[0038] (2) Add 0.0170g of manganese complex nanofibers into a beaker, add 20 ml of ethanol to the beaker, put it into ultrasonic dispersion for 30min, and then stir on a magnetic stirrer for 1h to ensure that the manganese salt is evenly dispersed in the solution , and then respectively take 7.5ml of graphene oxide solution and 54ul of carbon nanotube aqueous dispersion into the beaker, then stir for 4 hours to allow the substances in the solution to be evenly distributed, and then suction filter to form a film.

[0039] (3) The film was placed in a laser calciner and calcined with a 2.4 W laser for 10 seconds to prepare a self-supporting flexible composite electrode film mat...

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Abstract

The invention discloses a preparation method of self-supporting flexible composite electrode material used by a lithium ion battery. Graphene oxide is used as an adhesive, carbon nano tubes are used as a conductive agent and transition metal compound nanofibers are used as an active material precursor, and the bendable self-supporting flexible composite film with excellent mechanical properties is obtained by performing ultrasonic treatment, stirring, filtering and drying. The composite film not only has excellent electrochemical performance after being calcined with laser, but also could maintain excellent flexibility, and could be bent. In the material, a conductive network is formed by interlaced carbon nano tubes and graphene oxide obtained via hot reduction with laser so as to provide a better electronic channel for active material particles with bad electrical conductivity. Without using a binder and a current collector, the electrode material has better active material proportion and could further improve the energy density of the battery.

Description

field of invention [0001] The invention relates to an electrode material for a lithium ion battery, in particular to a method for preparing a self-supporting flexible composite electrode material, and belongs to the technical field of composite electrode materials. Background technique [0002] Lithium-ion batteries, as a class of batteries with high energy density, are currently widely used in personal electronic devices. However, as the performance of personal portable devices continues to leap forward, their requirements for supporting energy systems are also increasing. It is necessary to develop lithium-ion batteries with higher energy, higher power density, longer life, and even flexibility, so that Lithium-ion battery requirements for next-generation electronic devices. [0003] Transition metal oxides (M x o y ) has a high mass specific capacity and is a potential high-performance electrode material for lithium-ion batteries. However, its own low conductivity and...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/48H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 姜一杰曾勇傅立民程少男陈德志
Owner NANCHANG HANGKONG UNIVERSITY
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