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Title:
LITHIUM IRON PHOSPHATE COMPOSITE MATERIAL, PRODUCTION METHOD AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2012/040920
Kind Code:
A1
Abstract:
Provided are a lithium iron phosphate composite material, the production method thereof and the use thereof. The lithium iron phosphate composite material has a micro-size particle structure, which contains nano-size grains of lithium iron phosphate and graphene inside, and bears nano-carbon particulates outside. The lithium iron phosphate composite material has the properties of high conductivity, high-rate charge-/-discharge performance and high tap density. The production method comprises: preparing an iron salt mixed solution according to the mole ratio of P : Fe = 1 : 1; adding the above solution into an organic carbon source aqueous solution, followed by mixing and reacting, so as to obtain nano-iron phosphate covered with organic carbon source; adding the above nano-iron phosphate covered with organic carbon source and a lithium source compound into an aqueous solution of graphene oxide, agitating, mixing, and then spray drying, so as to obtain a precursor of lithium iron phosphate composite material; calcinating said precursor in a reduction atmosphere and cooling naturally, so as to obtain said lithium iron phosphate composite material. The material is used for lithium ion battery or positive electrode material.

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Inventors:
ZHOU MINGJIE (CN)
PAN JUN (CN)
WANG YAOBING (CN)
Application Number:
PCT/CN2010/077468
Publication Date:
April 05, 2012
Filing Date:
September 29, 2010
Export Citation:
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Assignee:
OCEANS KING LIGHTING SCIENCE (CN)
ZHOU MINGJIE (CN)
PAN JUN (CN)
WANG YAOBING (CN)
International Classes:
C01B25/45; C01B31/04; H01M4/04
Domestic Patent References:
WO2009061685A12009-05-14
Foreign References:
CN101562248A2009-10-21
CN101752561A2010-06-23
CN101800310A2010-08-11
CN101478045A2009-07-08
Other References:
See also references of EP 2623459A4
J. AM. CHEM. SOC., vol. 80, no. 6, 1958, pages 1339 - 1339
Attorney, Agent or Firm:
SHENZHEN ZHONGYI PATENT AND TRADEMARK OFFICE (CN)
深圳中一专利商标事务所 (CN)
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