It is still challenging in developing high performance lithium ion batteries to empower electric vehicles as well as sustainable candidates for large-scale energy storage systems. In this project, the candidate will develop advanced high capacity lithium ion batteries (HC-LIBs) based on fundamental and applicable research contents as follows: (i) Unlocking the multi-mechanistic of high capacity cathodes (HCC). In contrast to the conventional single crystalline intercalation or conversion-type electrodes, we will exploit electrode with total amorphous phase utilizing intercalation and conversion reactions, as well as crystalline-amorphous mixed phases utilizing crystallization intercalation and amorphous intercalation reactions. The materials will be firstly derived from two main methods as mechanochemical and electrochemical ways. (ii) Optimizing the performance and elucidating the mechanism of Li storage properties in HCC. The reversibility of the electrode will be firstly optimized by synthesis process and/or controllable adjustment of phase transition conditions. Followed by investigation on structure evolution with multiple ex-situ and in-situ characterization methods. Finally, both phase transferring mechanism and lithium storage mechanism will be theoretical revealed by density functional theory calculation. (iii) Exploiting novel phosphate electrolyte based on adjusting solvation structure and building full cells. Our preliminary result (see details in the following Section V of Research Plans) also shows present commercial carbonate electrolyte are not able to support the reversibility and long-term stability of multi-mechanistic cathodes. Correspondingly, we will develop phosphate ester-based electrolytes to support the smooth application of HCC through adjusting the anion-induced ion？solvent-coordinated (AI-ISC) structure. Subsequently, Building full cells with high capacity cathode and tailored phosphate electrolyte. The electrochemical performance of full cells as well as the degradation mechanism during long cycles will be studied to enhance stability and kinetics. To sum up, this research aims at inventing novel high capacity lithium ion batteries based on disclosing the multi-mechanistic electrochemistry of cathodes as well as novel phosphate electrolyte.