TY  - JOUR
AU  - Wu, Xiaochao
AU  - Rohman, F.
AU  - Meledina, Maria
AU  - Tempel, Hermann
AU  - Schierholz, Roland
AU  - Kungl, Hans
AU  - Mayer, Joachim
AU  - Eichel, Rüdiger-A.
TI  - 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
JO  - Electrochimica acta
VL  - 279
SN  - 0013-4686
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2018-01686
SP  - 108 - 117
PY  - 2018
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000434007000013
DO  - DOI:10.1016/j.electacta.2018.05.067
UR  - https://juser.fz-juelich.de/record/844245
ER  -