21.J.X. Zheng^, G.F. Teng^, J.L. Yang^, M. Xu, Q.S. Yao, Z.Q. Zhuo, W.L. Yang, Q.H. Liu*, F. Pan*, "Mechanism of exact transition between cationic and anionic redoxactivities in cathode material Li2FeSiO4", J Phys Chem Lett. 2018, 9, 6262-6268.