%0 Journal Article
%A Wu, Xiaochao
%A Rohman, F.
%A Meledina, Maria
%A Tempel, Hermann
%A Schierholz, Roland
%A Kungl, Hans
%A Mayer, Joachim
%A Eichel, Rüdiger-A.
%T Analysis of the effects of different carbon coating strategies onstructure and electrochemical behavior of LiCoPO4 material as a high-voltage cathode electrode for lithium ion batteries
%J Electrochimica acta
%V 279
%@ 0013-4686
%C New York, NY [u.a.]
%I Elsevier
%M FZJ-2018-01686
%P 108 - 117
%D 2018
%X The olivine polymorph LiCoPO4 was synthesized by solvothermal and a subsequent annealing process. Carbon free, ex-situ carbon coated and in-situ carbon coated materials were prepared. With the addition of citric acid in the solvothermal reaction, a carbon layer was coated via an in-situ approach. To systematically compare the different carbon coating routes, the structure and morphology of the LiCoPO4 materials were investigated by XRD, Raman, and SEM. HAADF-STEM combined with EDX was applied to analyze the homogeneity of the carbon layer and corresponding antisite defects. Electrochemical properties were analyzed by half-cells measuring cyclic-voltammograms, charge/discharge cycling behavior stability and rate-capability. It was found that the in-situ carbon coated LiCoPO4/C exhibited a superior electrochemical performance due to the relatively uniform and complete surface-layer formation. As a result, an appropriate carbon layer improves the electronic and ionic transport properties, ensures fast electron-transfer kinetics at the electrode particle surfaces and suppresses unwanted side reactions with the electrolyte
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000434007000013
%R 10.1016/j.electacta.2018.05.067
%U https://juser.fz-juelich.de/record/844245