Effect of synthesizing method on the properties of LiFePO4/C composite for rechargeable lithium-ion batteries

Man Soon Yoon, Mobinul Islam, Young Min Park, Soon Chul Ur

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Olivine-type LiFePO4/C cathode materials are fabricated with FePO4 powders that are pre-synthesized by two different processes from iron chloride solution. Process I is a modified precipitation method which is implemented by the pH control of a solution using NH4OH to form FePO4 precipitates at room temperature. Process II is a conventional precipitation method, of which H3PO4 (85%) solution is gradually added to a FeCl3 solution during the process to maintain a designated mole ratio. The solution is subsequently aged at 90°C in a water bath until FePO4 precipitates appear. In order to synthesize LiFePO4/C composites, each batch of FePO4 powders is then mixed with pre-milled lithium carbonate and glucose (8 wt. %) as a carbon source in a ball-mill. The structural characteristics of both LiFePO4/C composites fabricated using iron phospates from two different routes have been examined employing XRD and SEM. The modified precipitation process is considered to be a relatively simple and effective process for the preparation of LiFePO4/C composites owing to their excellent electrochemical properties and rate capabilities.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalElectronic Materials Letters
Volume9
Issue number2
DOIs
StatePublished - Mar 2013

Keywords

  • amorphous material
  • composite material
  • industrial waste
  • lithium iron phosphate
  • precipitation

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