Porous carbon-coated LiFePO4 nanocrystals prepared by in situ plasma-assisted pyrolysis as superior cathode materials for lithium ion batteries
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The porous carbon-coated LiFePO4 (LFP) nanocrystals synthesized by in situ plasma-assisted pyrolysis are reported. The particle size of LFP nanoparticles is well controlled through the coating of polyaniline (PANI) on FePO4. The effect of PANI content in FePO4/PANI on the morphology and electrochemical performance of LiFePO4 particles is extensively investigated. Results show that the optimized amount of PANI in FePO4/PANI is 10.16% and the corresponding carbon content in activated porous carbon-coated LiFePO4 (LFP/AC-P4) is 9.27%. The primary particle size of LFP/AC-P4 is 20~50 nm which are wrapped and connected homogeneously and loosely by activated porous carbon. The LFP/AC-P4 composite delivers a capacity of 166.9 mAh g−1 at 0.2 C, which is much higher than carbon-encapsulated LiFePO4 nanocomposite (LFP/C) synthesized without the assistance of plasma pyrolysis (163.5 mAh g−1). Even at high rate of 5 C, a specific capacity of 128.4 mAh g−1 is achievable with no obvious capacity fading after 250 cycles.
KeywordsIn situ plasma assisted pyrolysis Porous carbon LiFePO4 Excellent rate capability Superior cyclic stability
Authors acknowledge the supports from the Chinese National Natural Science Foundation (No. 11105078), the Guangdong Provincial Natural Science Foundation (No. 2017A030313092), the Science Foundation of Zhejiang Sci-Tech University (No. 18062245-Y), the “Outstanding Talent and Team Plans Program” and “the Fundamental research funds for the central university” of South China University of Technology (No. 2018ZD25).
- 3.Li Y, Meyer S, Lim J, Lee SC, Gent WE, Marchesini S, Krishnan H, Tyliszczak T, Shapiro D, Kilcoyne AL, Chueh WC (2015) Effects of particle size, electronic connectivity, and incoherent nanoscale domains on the sequence of lithiation in LiFePO4 porous electrodes. Adv Mater 27(42):6591–6597PubMedCrossRefGoogle Scholar
- 7.Jiang Z, Jiang Z-j (2012) Effects of carbon content on the electrochemical performance of LiFePO4/C core/shell nanocomposites fabricated using FePO4/polyaniline as an iron source. J Alloys Compd 537:308–317Google Scholar
- 40.Pratheeksha PM, Mohan EH, Sarada BV, Ramakrishna M, Hembram K, Srinivas PV, Daniel PJ, Rao TN, Anandan S (2016) Development of a novel carbon-coating strategy for producing core-shell structured carbon coated LiFePO4 for an improved Li-ion battery performance. Phys Chem Chem Phys 19(1):175–188PubMedCrossRefPubMedCentralGoogle Scholar