A green recycling process designed for LiFePO<inf>4</inf> cathode materials for Li-ion batteries

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

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

A green process route to recycle LiFePO<inf>4</inf>/C electrode materials is proposed in this work. First, a robust strategy to synthesize LiFePO<inf>4</inf>/C cathode materials from a precursor of a crystalline FePO<inf>4</inf>·2H<inf>2</inf>O phase (metastrengite I) is presented. In order to prepare crystalline FePO<inf>4</inf>·2H<inf>2</inf>O, 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 FePO<inf>4</inf>·2H<inf>2</inf>O with lithium sources, we find that LiFePO<inf>4</inf>/C cathode materials synthesized at 700°C deliver a maximum discharge capacity of 168.51 mA h g<sup>-1</sup> at 0.1 C (1 C rate = 170 mA h g<sup>-1</sup>) with a capacity retention of 99.36% after the 25<sup>th</sup> cycle at 1 C. Furthermore, commercially available LiFePO<inf>4</inf> powders and recovered LiFePO<inf>4</inf> electrode materials from spent batteries are both tested with our developed recycling process, where we decompose LiFePO<inf>4</inf> powders/electrodes to prepare crystalline FePO<inf>4</inf>·2H<inf>2</inf>O, and then re-synthesize LiFePO<inf>4</inf>/C cathode materials. In both cases, our recycled LiFePO<inf>4</inf>/C exhibits a very comparable discharge capacity of ∼140 mA h g<sup>-1</sup> 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

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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