Feasibility of Prelithiation in LiFePO<sub>4</sub>
Mengyan Cao, Zepeng Liu, Xiao Zhang, Lu Yang, Shiwei Xu, Suting Weng, Simeng Zhang, Xiaoyun Li, Yejing Li, Tongchao Liu, Yurui Gao, Xuefeng Wang, Zhaoxiang Wang, Liquan Chen
Abstract
Abstract Lithium iron phosphate (LiFePO 4 ) is widely applied as the cathode material for the energy storage Li‐ion batteries due to its low cost and high cycling stability. However, the low theoretical specific capacity of LiFePO 4 makes its initial capacity loss more concerning. Therefore, lithium compensation by way of prelithiation and applications of sacrificial Li‐rich additives in LiFePO 4 is imminent in elevating the energy density and/or prolonging the lifetime of the LiFePO 4 ‐based Li‐ion batteries (LIBs). Prelithiation in LiFePO 4 is herein carried out by electrochemical and chemical methods and its feasibility is proved on the basis of the electrochemical evaluations such as the initial charge capacity and the cycling stability. In addition, the site of the pre‐intercalated Li‐ions is found via comprehensive physical characterizations and the density functional theory (DFT) calculations. These findings open a new avenue for elevating the energy density and/or prolonging the lifetime of the high‐energy‐density batteries.