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Method for preparing Fe2O3 and expanded graphite composite material of lithium ion battery

A lithium-ion battery and expanded graphite technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult to meet the application conditions of lithium-ion batteries, achieve superior cycle and rate performance, convenient operation, and low production costs Effect

Inactive Publication Date: 2015-09-30
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the products obtained by such methods are difficult to meet the application conditions of lithium-ion batteries.

Method used

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  • Method for preparing Fe2O3 and expanded graphite composite material of lithium ion battery
  • Method for preparing Fe2O3 and expanded graphite composite material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix expanded graphite with an expansion volume of 350 mL / g and a purity of 95% with ferrocene at a mass ratio of 1:8. Then put it in an autoclave, keep the temperature at 500°C for 4 hours, and take it out after cooling to prepare Fe 2 o 3 Nanoparticles well dispersed Fe 2 o 3 / expanded graphite composites, see figure 1 , B in the figure is an enlargement of A.

[0043] The material's initial charge capacity can reach 685mAh / g at a current density of 50mA / g, and it still maintains a reversible capacity of 653mAh / g after 70 cycles, see figure 2 .

Embodiment 2

[0045] Mix expanded graphite with an expansion volume of 428 mL / g and a purity of 98% with ferrocene at a mass ratio of 1:12. Then put it in an autoclave, keep the temperature at 400°C for 8 hours, and take it out after cooling to prepare Fe 2 o 3 Nanoparticles well dispersed Fe 2 o 3 / Expanded graphite composite.

[0046] The material has an initial charge capacity of 692mAh / g at a current density of 50mA / g, and still maintains a reversible capacity of 658mAh / g after 70 cycles.

Embodiment 3

[0048] Mix expanded graphite with an expansion volume of 560 mL / g and a purity of 98% with ferrocene at a mass ratio of 1:10. Then put it in a closed reaction kettle, preferably at a temperature of 180° C. for 12 hours, and take it out after cooling. Put the product in a microwave oven and heat it for 15s at the preferred power of 700W to produce Fe 2 o 3 Nanoparticles well dispersed Fe 2 o 3 / Expanded graphite composite.

[0049] The material has an initial charge capacity of 672mAh / g at a current density of 50mA / g, and still maintains a reversible capacity of 651mAh / g after 70 cycles.

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Abstract

The invention provides a method for preparing a Fe2O3 and expanded graphite composite material of a lithium ion battery. The method particularly comprises the steps that expanded graphite is used as a carrier material, the ferrocene is used as the precursor of Fe2O3, the expanded graphite and the Fe2O3 are mixed based on the mass ratio being 1:2-12, and the Fe2O3 and expanded graphite composite material is prepared by adopting the high pressure decomposition method or the microwave reaction method or the high temperature thermal decomposition method. The method is wide in raw material source, low in cost, simple in preparation technology, low in investment, high in operability and suitable for large-scale production. The Fe2O3 and expanded graphite composite material can be used as a negative electrode material of a common or flexible lithium ion battery, and has the advantages of being high in capacity, good in circulation and rate capability and the like.

Description

technical field [0001] The present invention relates to a kind of Fe that is used for lithium ion battery negative electrode 2 o 3 / Expanded graphite composite material and preparation method thereof. Background technique [0002] Due to the advantages of high output voltage and energy density, good cycle stability, and environmental friendliness, lithium-ion batteries have occupied most of the consumer electronics market as a power source for various electronic products. In recent years, with the rapid upgrading of electronic products and the continuous development of the electric vehicle market, lithium-ion batteries are required to have lighter weight, smaller volume, and higher power density. As far as negative electrode materials are concerned, the theoretical specific capacity of commercial graphite-based negative electrode materials is only 372mAh / g. Its low energy density and power density are obviously difficult to meet the demanding requirements of the market d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/52H01M10/0525Y02E60/10
Inventor 赵云马灿良李思殿
Owner SHANXI UNIV
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