The irreversible capacity loss in the first cycle significantly reduces the specific capacity of lithium ion batteries. Cathode prelithiation is a common method to alleviate this problem. Here, Fe/Li2O were successfully prepared by in situ solid phase reaction method. Fe/Li2O as a cathode prelithiation additive has a high prelithiation specific capacity of 447.3 mAh g -1 during charging, and the first charge capacity of LiNi0.6Co0.2Mn0.2O2 with 7.5% Fe/Li2O additive could be enhanced by 9.1% and its cycling stability was improved from 86.9% to 90.2% after 70 cycles. The cathode prelithiation additive remarkably enhanced the content of active lithium during the initial delithiation process, contributing the formation of solid electrolyte interphase on the anode surface and better cycling stability. This easy-operating cathode prelithiation method could obtain evident effect of prelithiation and had good compatibility with existing lithium ion batteries.
The lithium metal batteries (LMBs) using metallic Li as anode with high-energy density have been prevailed in the field of energy storage, while the aggregation of Li dendrites and brittle solid state electrolyte interface (SEI) impede the development of Li anode. In this work, to regulate the interface of Li anode, a Fe/Li 2 O/LiCl mixed electron/ion conducting layer is in-situ generated on the surface of Li anode, which is derived from the electrochemical reaction between Li anode and Fe 2 O 3 /FeOCl coatings on commercial separator. The synergistic effect between electron conductive Fe and ion conductive Li 2 O/LiCl is beneficial to build up dense and uniform SEI and promote uniform Li + flux, resulting in smooth Li deposition, which will further stabilize the Li metal surface and prolong the battery life of LMBs. Specifically, the symmetric Li||Li cells with Fe 2 O 3 /FeOCl can operate steadily for 600 h at 1 mAh cm −2 without obvious voltage polarization, and the corresponding full battery matched with S-PAN delivers capacity retention of 64.43 % at 500 mA g −1 after 350 cycles.
危险品化学品经营许可证（带存储）