fig1

Figure 1. Screening for smaller volume changes of TM-LFP. A: Cell structure of LFP. B: Cell structure of TM-LFP with a TM doped at Fe site. C: Lattice parameters of LFP and TM-LFP, where doping has a greater effect on the length of the “a” direction than the “c” direction. D: Cell volumes of LFP and TM-LFP. The light-yellow region denotes TM-doped structures with small volume changes. E: Changes in cell volume of TM-LFP compared with LFP and three structures with minimal volume variations, where the darker the color, the greater the volume of TM-LFP changes from LFP. LFP: LiFePO₄; TM-LFP: Transition metal-doped LFP.