TY  - JOUR
AU  - Wu, Xiaochao
AU  - Meledina, Maria
AU  - Barthel, Juri
AU  - Liu, Zigeng
AU  - Tempel, Hermann
AU  - Kungl, Hans
AU  - Mayer, Joachim
AU  - Eichel, Rüdiger-A.
TI  - Investigation of the Li-Co antisite exchange in Fe-substitued LiCoPO4 cathode for high-voltage lithium ion batteries
JO  - Energy storage materials
VL  - 22
SN  - 2405-8297
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2019-04192
SP  - 138 - 146
PY  - 2019
AB  - Carbon coated olivine Pnma LiCoPO4 (LCP/C) and Fe-substituted LiCo0.8Fe0.2PO4 (LCFP/C) were synthesized by a solvothermal method and their structural features and electrochemical properties were investigated. The electrochemical performance of LCFP/C is better than that of LCP/C, owing to the partial substitution of Co by Fe which effectively suppresses the increasement of antisite exchange between Li+ and Co2+ ions within the structure during cycling, despite a similar amount of Li–Co antisite exchange in pristine LCP/C and LCFP/C samples. Furthermore, direct visualization of Co in Li sites in the pristine samples and after 50 cycles was achieved through high-resolution scanning transmission electron microscopy for both LCP/C and LCFP/C. It was found that LCP/C locally formed a new cation-ordered structure after cycling due to the Li–Co antisite exchange, while the structure of LCFP/C remains almost the same. This study provides direct evidence that Fe substitution reduced the Li–Co exchange and improved the electrochemical cycling life of the LiCoPO4 cathode for high-voltage lithium ion batteries.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000488256300014
DO  - DOI:10.1016/j.ensm.2019.07.004
UR  - https://juser.fz-juelich.de/record/864400
ER  -