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Lithium battery LiFePO4 anode material with internal three-dimensional conductive structure and preparation method thereof

A lithium iron phosphate, cathode material technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as poor conductivity, reduce resistivity, increase cycle times and lithium battery life, and increase conductivity.

Inactive Publication Date: 2010-12-01
耿世达
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Poor conductivity is a major shortcoming of lithium iron phosphate, and the current solution is to add carbon or other conductive agents

Method used

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  • Lithium battery LiFePO4 anode material with internal three-dimensional conductive structure and preparation method thereof
  • Lithium battery LiFePO4 anode material with internal three-dimensional conductive structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 20 kg of lithium iron phosphate particles and 80 kg of nano-carbon materials into a high-temperature reactor protected by inert gas at the same time. The heating rate of the high-temperature reactor is 150°C per hour, and the temperature rises to 1000°C. The holding time is 2 hours. The stirring speed is 100 rpm; the temperature of the reactor is lowered to 200°C, and the pressure is 10 -5 Pa, reacted for 10 hours, so that the nano-carbon material was coated with lithium iron phosphate particles;

[0019] (2) Coating again: put the cladding in step (1) and nano metal or metal compound according to weight percentage 10%: 90%, put into the high-temperature reactor with inert gas protection at the same time, the heating rate of high-temperature reactor is Raise the temperature by 200°C every 1 hour, the temperature rises to 1000°C, the holding time is 20 hours, and the stirring speed is 300 rpm; the temperature of the reactor drops to 400°C, and the pressure is 10 -5 ...

Embodiment 2

[0022] (1) First coating: Put 60 kg of lithium iron phosphate particles and 40 kg of nano-carbon materials into a high-temperature reactor protected by inert gas at the same time. The heating rate of the high-temperature reactor is 150°C per hour, and the temperature rises to 900°C , the holding time is 10 hours, the stirring speed is 300 rev / min; -5 Pa, reacted for 10 hours, so that the nano-carbon material was coated with lithium iron phosphate particles;

[0023] (2) Coating again: put the cladding in step (1) and the nanometer metal or metal compound according to the weight percentage of 20%: 80%, and put it into a high-temperature reactor with inert gas protection at the same time, and the temperature rise rate of the high-temperature reactor is Raise the temperature by 200°C every 1 hour, the temperature rises to 800°C, the holding time is 10 hours, and the stirring speed is 300 rpm; the temperature of the reactor drops to 800°C, and the pressure is 10 -5 Pa, react for ...

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Abstract

The invention relates to a lithium battery LiFePO4 anode material with an internal three-dimensional conductive structure and a preparation method thereof. In the lithium battery LiFePO4 anode material, LiFePO4 anode micron particles form a core; a nanometer carbon material wraps the LiFePO4 nano particles to form cored conductors, the shell layers and cores of the cored conductors form first conductive layers; a nanometer metal or a metal oxide wraps the core-containing conductor again; shells wrapped again form second conductive layers; the LiFePO4 anode micron particles are formed by two times of wrapping; and the second conductive layers and the first conductive layers of the LiFePO4 anode micron particles form a three-dimensional network together. The lithium battery LiFePO4 anode material with the internal three-dimensional conductive structure is formed by a two-time wrapping process. The capacitance of the material is more than 150mAh / g; and after 200 times of circulation, the capacitance attenuation of the material is less than 5 percent.

Description

technical field [0001] The invention relates to a lithium battery lithium iron phosphate positive electrode material containing a three-dimensional conductive structure inside, in particular to a lithium battery positive electrode material that uses nano carbon materials and nano metals or metal compounds to coat lithium iron phosphate twice. Background technique [0002] There are many kinds of positive electrode materials for lithium batteries, mainly including lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc. [0003] As a cathode material for lithium batteries, lithium iron phosphate has good electrochemical properties, a very stable charge and discharge platform, and a stable structure during charge and discharge. At the same time, the material is non-toxic, non-polluting, has good safety performance, can be used in high-temperature environments, and has a wide range of raw material sources. [0004] Poor conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/62H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 耿世达
Owner 耿世达
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