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Methods of producing cathode active material coated with carbon

A technology for positive electrode active materials and raw materials, applied in the field of production of carbon-coated positive electrode active materials, can solve the problems of increased processing costs, no suitable innovative methods have been proposed, and difficulties, and achieve the effect of improving capacitance and crystallinity

Active Publication Date: 2015-03-04
IND FOUND OF CHONNAM NAT UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not easy to uniformly coat the entire surface of LFP with carbon, and there is a problem of increased processing cost due to the additional carbon coating process
Moreover, although various methods of improving the crystallinity of LFP powder while reducing processing costs are being investigated, no suitable innovative method has been proposed

Method used

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  • Methods of producing cathode active material coated with carbon
  • Methods of producing cathode active material coated with carbon

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Embodiment 1

[0044] After adding the lithium precursor and the iron precursor to the polyol solvent, the mixture was stirred at a temperature of about 50° C. for about 1 hour. The polyol solvent used in this application is triethylene glycol (TEG), and the lithium precursor is lithium acetate (CH 3 COOLi) and the iron precursor is ferrous nitrate (Fe(NO 2 ) 2 ). Next, after the phosphoric acid precursor was added thereto, the mixture was stirred again at a temperature of about 50° C. for 1 hour to prepare a reaction liquid. The phosphoric acid precursor used in this application is phosphoric acid (H 3 PO 4 ). Subsequently, after heating the reaction liquid at a temperature of about 200° C. for about 30 minutes, the reaction liquid was burned to prepare a first cathode active material powder. Then, the first positive electrode active material powder is coated with a diluent, and then the final positive electrode active material powder is generated by burning the diluent.

Embodiment 2

[0046] After adding the lithium precursor and the iron precursor to the polyol solvent, the mixture was stirred at a temperature of about 50° C. for about 1 hour. The polyol solvent used in this application is triethylene glycol (TEG), and the lithium precursor is lithium acetate (CH 3 COOLi) and the iron precursor is ferrous nitrate (Fe(NO 2 ) 2 ). Next, after the phosphoric acid precursor was added thereto, the mixture was stirred again at a temperature of about 50° C. for 1 hour to prepare a reaction liquid. The phosphoric acid precursor used in this application is phosphoric acid (H 3 PO 4 ). Subsequently, after heating the reaction liquid at a temperature of about 200° C. for about 30 minutes, the reaction liquid was combusted while being sprayed to prepare a first cathode active material powder. Then, the first cathode active material powder is coated with a diluent, followed by burning the diluent to prepare a second cathode active material powder. Next, the seco...

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Abstract

A method for producing a positive electrode active material is disclosed. For the production of the positive electrode active material, raw materials are mixed in a polyol solvent in order to produce a reaction solution, which is then burned to produce a first positive electrode active material powder. Then, the first positive electrode active material powder is coated with a combustible organic solvent and then burned to produce a second positive electrode active material powder. The positive electrode active material produced by this method has improved capacity and crystallinity.

Description

technical field [0001] The present invention relates to a method of producing a carbon-coated positive electrode active material, and more particularly, to a method of producing a carbon-coated positive electrode active material for a positive electrode of a storage battery. Background technique [0002] In recent years, due to the rapid development of mobile IT products such as mobile phones, notebooks, etc., research on small storage batteries has also been actively carried out. Also, due to the problems of fossil energy depletion and global warming, interest in energy storage systems for storing environmentally friendly energy has increased, and research on large-scale storage batteries has also been actively conducted. [0003] Recently, LFP (LiFePO 4 ) research has been actively carried out. LFP offers a high theoretical capacity (170 mAh / g), and furthermore, has advantages such as low price due to its abundant and very stable source of raw materials. However, the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/583H01M4/139
CPCH01M4/366H01M4/583Y02E60/10H01M4/04H01M4/139
Inventor 卢熙淑梁日信梁东澈金在国
Owner IND FOUND OF CHONNAM NAT UNIV
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