Synthesis and Electrochemical Properties of Carbon-Coated Li2FeP2O7 for Li-Ion Batteries

Carbon-coated Li2FeP2O7 (Li2FeP2O7-C) and Mg-doped Li2FeP2O7-C were succeccfully synthesized with pitch as a carbon source and Mg(C2O4)·2H2O as a Mg source, and the charge/discharge properties were compared with that of bare Li2FeP2O7. A thin carbon layer (ca. 5 nm in thickness) was coated on Li2FeP...

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Main Authors: Saito, Morihiro, Yano, Sosuke, Maekawa, Takuma, Tasaka, Akimasa, Inaba, Minoru
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:Carbon-coated Li2FeP2O7 (Li2FeP2O7-C) and Mg-doped Li2FeP2O7-C were succeccfully synthesized with pitch as a carbon source and Mg(C2O4)·2H2O as a Mg source, and the charge/discharge properties were compared with that of bare Li2FeP2O7. A thin carbon layer (ca. 5 nm in thickness) was coated on Li2FeP2O7 powder after heat-treatment. Li2FeP2O7-C and Mg-doped Li2FeP2O7-C exhibited high discharge capacities of 97 and 104 mAh g-1, respectively, at C/10 rate, implying a great improvement from that of bare Li2FeP2O7 (69 mAh g-1). The cycleability and rate-capability were also improved by carbon-coating and Mg doping. Mg-doped Li2FeP2O7-C kept a high discharge capacity of 88 mAh g-1 even at 1 C rate. AC impedance analysis revealed that Mg-addition suppresses excess electrolyte decomposition on the surface of Li2FeP2O7 and reduces the resistance of SEI.
ISSN:1938-5862
1938-6737
DOI:10.1149/05026.0251ecst