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Synthesis of Li excess LiFePO4/C using iron chloride extracted from steel scrap pickling

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Abstract

Olivine-type Li rich Li1+xFePO4/C composites are synthesized by a solid state reaction process using premilled Li2CO3 and pre-synthesized amorphous FePO4·xH2O powders. The amorphous FePO4·xH2O powders are prepared from an industrial waste liquid (by-product), a FeCl3 (38%) solution, via a precipitation process. In addition, lithium carbonate is pre-milled using a high energy nano mill to control particle sizes and shape differences for enhancing the reaction activity in the starting materials. The main purpose of this study is to investigate the effect of excess Li on the electrochemical properties of LiFePO4 cathode materials. The pre-synthesized FePO4 powders are mixed with pre-milled lithium carbonate and glucose (8 wt%) using a ball-mill process. The structural characteristics of the Li1+xFePO4/C composites are examined by XRD and SEM. To investigate the effect of excess Li content on the electrochemical properties in Li1+xFePO4/C composites, a Li[LiPF6 (Ethylene carbonate + Dimethyl carbonate)] Li1+xFePO4/C model cell is used. It is demonstrated that the 1% Li rich Li/[Li1.01FePO4/C] cell exhibits the best electrochemical performance and delivers an initial discharge capacity of 161 mAhg−1, which is 25 mAhg−1 higher than that of the Li/[LiFePO4/C] cell.

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Authors and Affiliations

  1. Department of Materials Sci. and Eng./Research Center for Sustainable Eco-Devices and Materials (ReSEM), Korea National University of Transportation, Chungju, Chungbuk, 380-702, Korea

    Man-Soon Yoon, Mobinul Islam & Soon-Chul Ur

  2. Fuel Cell Project, Research Institutes of Industrial Science and Technology, 32 Hyoja-Dong, Nam-Gu, Pohang, Gyeongbuk, 790-330, Korea

    Young Min Park & Song Jung Hoon

  3. Department of Polymer Sci. and Eng., Korea National University of Transportation, Chungju, Chungbuk, 380-702, Korea

    Jong-Tae Son

Authors
  1. Man-Soon Yoon
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  2. Mobinul Islam
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  3. Young Min Park
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  4. Song Jung Hoon
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  5. Jong-Tae Son
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  6. Soon-Chul Ur
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Correspondence to Soon-Chul Ur.

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Yoon, MS., Islam, M., Park, Y.M. et al. Synthesis of Li excess LiFePO4/C using iron chloride extracted from steel scrap pickling. Met. Mater. Int. 20, 785–791 (2014). https://doi.org/10.1007/s12540-014-4024-z

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  • DOI: https://doi.org/10.1007/s12540-014-4024-z

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