This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1016/j.electacta.2018.05.067 in citations.
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
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
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...
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Personal Name(s): | Wu, Xiaochao (Corresponding author) |
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Rohman, F. / Meledina, Maria / Tempel, Hermann / Schierholz, Roland / Kungl, Hans / Mayer, Joachim / Eichel, Rüdiger-A. | |
Contributing Institute: |
Materialwissenschaft u. Werkstofftechnik; ER-C-2 Grundlagen der Elektrochemie; IEK-9 |
Published in: | Electrochimica acta, 279 (2018) S. 108 - 117 |
Imprint: |
New York, NY [u.a.]
Elsevier
2018
|
DOI: |
10.1016/j.electacta.2018.05.067 |
Document Type: |
Journal Article |
Research Program: |
Electrochemical Storage |
Publikationsportal JuSER |
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 |