%0 Journal Article
%A Wu, Xiaochao
%A Meledina, Maria
%A Barthel, Juri
%A Liu, Zigeng
%A Tempel, Hermann
%A Kungl, Hans
%A Mayer, Joachim
%A Eichel, Rüdiger-A.
%T Investigation of the Li-Co antisite exchange in Fe-substitued LiCoPO4 cathode for high-voltage lithium ion batteries
%J Energy storage materials
%V 22
%@ 2405-8297
%C Amsterdam
%I Elsevier
%M FZJ-2019-04192
%P 138 - 146
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000488256300014
%R 10.1016/j.ensm.2019.07.004
%U https://juser.fz-juelich.de/record/864400