A green recycling process designed for LiFePO4 cathode materials for Li-ion batteries

Eun Jeong Shin, Soo Kim, Jae Kyo Noh, Dongjin Byun, Kyung Yoon Chung, Hyung Sun Kim, Byung Won Cho

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

A green process route to recycle LiFePO4/C electrode materials is proposed in this work. First, a robust strategy to synthesize LiFePO4/C cathode materials from a precursor of a crystalline FePO4·2H2O phase (metastrengite I) is presented. In order to prepare crystalline FePO4·2H2O, a solution precipitation route is adapted, where the reaction conditions such as temperature and pH are precisely controlled. Among various heat treatment temperatures to calcine our prepared FePO4·2H2O with lithium sources, we find that LiFePO4/C cathode materials synthesized at 700°C deliver a maximum discharge capacity of 168.51 mA h g-1 at 0.1 C (1 C rate = 170 mA h g-1) with a capacity retention of 99.36% after the 25th cycle at 1 C. Furthermore, commercially available LiFePO4 powders and recovered LiFePO4 electrode materials from spent batteries are both tested with our developed recycling process, where we decompose LiFePO4 powders/electrodes to prepare crystalline FePO4·2H2O, and then re-synthesize LiFePO4/C cathode materials. In both cases, our recycled LiFePO4/C exhibits a very comparable discharge capacity of ∼140 mA h g-1 at 1 C with a capacity retention of ∼99%.

Original languageEnglish
Pages (from-to)11493-11502
Number of pages10
JournalJournal of Materials Chemistry A
Volume3
Issue number21
DOIs
Publication statusPublished - 2015 Jun 7

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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