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Ferrous silicate lithium/carbon/carbon nano tube compound anode material and manufacture method thereof

A carbon nanotube composite and lithium ferrous silicate technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of not meeting the requirements of power batteries, insufficient reversible capacity, and potential safety hazards. Achieve good cycle performance, high charge and discharge capacity, and low cost

Inactive Publication Date: 2010-09-22
CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The shortcomings of various deintercalated lithium oxide materials used in the positive electrode of commercial lithium-ion batteries are: almost all oxides are strong oxidants in the charged state, and there are serious safety hazards in direct contact with the currently used organic electrolytes
However, the reversible capacity of lithium iron silicate / carbon composite cathode material is not high enough to meet the requirements of power batteries under high rate conditions.

Method used

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  • Ferrous silicate lithium/carbon/carbon nano tube compound anode material and manufacture method thereof
  • Ferrous silicate lithium/carbon/carbon nano tube compound anode material and manufacture method thereof
  • Ferrous silicate lithium/carbon/carbon nano tube compound anode material and manufacture method thereof

Examples

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Effect test

Embodiment 1

[0047] Example 1 Preparation of lithium ferrous silicate / carbon / carbon nanotube composite cathode material

[0048] Add ferrous oxalate (7.2177g), silicon dioxide (2.4153g), lithium carbonate (2.9705g) and asphalt into a ball mill jar, and after ball milling and mixing in acetone, vacuum dry at 80°C to obtain lithium ferrous silicate / carbon precursor. Put the carbon nanotubes into a beaker, add acetone and undergo sufficient ultrasonic treatment to obtain a suspension. Under stirring conditions, add lithium ferrous silicate / carbon precursor, and after sufficient ultrasonic treatment, under stirring conditions at 60°C Evaporate to dryness to obtain the precursor of lithium ferrous silicate / carbon / carbon nanotube. The precursor was pressed into tablets, pre-fired at 350° C. for 5 hours in argon, and then fired at 700° C. for 10 hours to obtain a lithium ferrous silicate / carbon / carbon nanotube composite positive electrode material. Through elemental analysis and testing, the t...

Embodiment 2

[0053] Example 2 Preparation of lithium ferrous silicate / carbon / carbon nanotubes

[0054] Add ferrous oxalate (7.2177g), silicon dioxide (2.4153g), lithium carbonate (2.9705g) and asphalt into a ball mill jar, and after ball milling and mixing in acetone, vacuum dry at 80°C to obtain lithium ferrous silicate / carbon precursor. Put the carbon nanotubes into a beaker, add acetone and undergo sufficient ultrasonic treatment to obtain a suspension. Under stirring conditions, add lithium ferrous silicate / carbon precursor, and after sufficient ultrasonic treatment, under stirring conditions at 60°C Evaporate to dryness to obtain the precursor of lithium ferrous silicate / carbon / carbon nanotube. The precursor was pressed into tablets, pre-calcined at 350° C. for 5 h in argon, and then calcined at 700° C. for 10 h to obtain a lithium ferrous silicate / carbon nanotube composite positive electrode material. The total content of carbon and carbon nanotubes in the obtained lithium ferrous...

Embodiment 3

[0055] Example 3 Preparation of lithium ferrous silicate / carbon / carbon nanotubes

[0056] Add ferrous oxalate (7.2177g), silicon dioxide (2.4153g), lithium carbonate (2.9705g) and asphalt into a ball mill jar, and after ball milling and mixing in acetone, vacuum dry at 80°C to obtain lithium ferrous silicate / carbon precursor. Put the carbon nanotubes into a beaker, add acetone and undergo sufficient ultrasonic treatment to obtain a suspension. Under stirring conditions, add lithium ferrous silicate / carbon precursor, and after sufficient ultrasonic treatment, under stirring conditions at 60°C Evaporate to dryness to obtain the precursor of lithium ferrous silicate / carbon / carbon nanotube. The precursor was pressed into tablets, pre-fired at 350° C. for 5 hours in argon, and then fired at 700° C. for 10 hours to obtain a lithium ferrous silicate / carbon / carbon nanotube composite positive electrode material. The total content of carbon and carbon nanotubes in the obtained lithiu...

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Abstract

The invention relates to a ferrous silicate lithium / carbon / carbon nano tube compound anode material and a manufacture method thereof, belonging to the fields of energy sources and new materials. The invention aims to provides a lithium ion battery anode material with high reversible capacity under the condition of high multiplying power; the lithium ion battery anode material consists of particles formed by covering the surface of the ferrous silicate lithium with carbon obtained by heating and carbonizing asphalt and carbon nano tubes, wherein the proportion of the carbon obtained by heating and carbonizing asphalt and the carbon nano tubes is 2%-30% of the ferrous silicate lithium / carbon / carbon nano tube compound anode material, the mass ratio of the carbon nano tubes to the carbon obtained by heating and carbonizing asphalt is 1:0.1-10. The invention uses the asphalt and the carbon nano tubes as carbon sources to in-situ synthesize the ferrous silicate lithium / carbon / carbon nano tube compound anode material by simple and safe processes with low cost; the particle diameter of the obtained ferrous silicate lithium / carbon / carbon nano tube compound anode material is nano dimension and has higher charge-discharge capacity, good circulating performance and high discharge capacity especially under the condition of high multiplying power.

Description

technical field [0001] The invention relates to a lithium ferrous silicate / carbon / carbon nanotube composite used as a cathode material for a lithium ion battery and a preparation method thereof, belonging to the fields of energy and new materials. Background technique [0002] The shortcomings of various deintercalated lithium oxide materials used in the positive electrode of commercial lithium-ion batteries are that almost all oxides are strong oxidants in the charged state, and there are serious safety hazards in direct contact with the currently used organic electrolytes. Iron-based cathode materials have obvious advantages: abundant raw material resources, cheap price, non-toxic, environmentally friendly, good thermal stability, and high safety. The currently reported iron-based cathode materials mainly include LiFePO 4 with Li 2 FeSiO 4 . Since the content of Si element is the first among the elements on the earth, it is not harmful to the environment and human bein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
Inventor 潘中来黄小兵于作龙
Owner CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD