Zhou, Hui Shi, Yong Xin, Fengxia Omenya, Fredrick Whittingham, M. Stanley ε- and β‑LiVOPO<sub>4</sub>: Phase Transformation and Electrochemistry ε- and β-LiVOPO<sub>4</sub> were synthesized from the same precursor at different temperatures in an air atmosphere. ε-LiVOPO<sub>4</sub> is obtained at 400 and 700 °C. The 700 °C sample has better purity and crystallinity, but the 400 °C sample has a little better electrochemical performance due to its smaller particle size and the conducting carbon residue in the sample. β-LiVOPO<sub>4</sub> is formed between the above two temperatures, which gives slightly lower capacity than that of the ε-LiVOPO<sub>4</sub> sample, indicating higher kinetics of the lithium reaction for the ε phase than those of the β one. The phase transformation from ε to β then back reversibly to ε was also observed by ex situ X-ray diffraction. This thermal study verifies that ε-LiVOPO<sub>4</sub> is the more stable phase for LiVOPO<sub>4</sub>; however, reaction kinetics control the phases formed at lower temperatures. LiVOPO 4;air atmosphere;Phase Transformation;β- LiVOPO 4;Electrochemistry ε-;study verifies;ε- LiVOPO 4 sample;carbon residue;particle size;ε- LiVOPO 4;X-ray diffraction;phase transformation;electrochemical performance;ε phase;lithium reaction;reaction kinetics control 2017-08-08
    https://acs.figshare.com/articles/journal_contribution/_-_and_LiVOPO_sub_4_sub_Phase_Transformation_and_Electrochemistry/5325094
10.1021/acsami.7b07895.s001