Application of Li₂S to compensate for loss of active lithium in a Si–C anode

Abstract

A battery consisting of a Li2S pre-lithiated material/cathode and Si–C anode shows both high energy density and excellent capacity retention.

Prelithiation/Presodiation Techniques for Advanced Electrochemical Energy Storage Systems: Concepts, Applications, and Perspectives

“…Zhan et al utilized Li 2 S species to replenish for the loss of active lithium source in the first cycle for improving the specific energy densities of LIBs. [ 123 ] Note that the prelithiation material with a core–shell structure fabricated by mixing Li 2 S, Ketjenblack and poly(vinylpyrrolidone) could exhibit a high irreversible capacity of 1084 mAh g −1 . The prelithiation effect of Li 2 S is evaluated through the investigation of LiFePO 4 (Li 2 S)/Si‐C full cell.…”

Prelithiation Bridges the Gap for Developing Next‐Generation Lithium‐Ion Batteries/Capacitors

“…Huang and co‐workers prepared a core–shell structured Li 2 S/Ketjen black (KB)/poly(vinylpyrrolidone) nanocomposite. [ 88 ] By coating it over the LiFePO 4 cathode, the initial CE of the graphite/LiFePO 4 full cell was increased to nearly 100%.…”

Opportunities and Challenges of Li2C4O4 as Pre‐Lithiation Additive for the Positive Electrode in NMC622||Silicon/Graphite Lithium Ion Cells

“…[ 7b ] An ideal pre‐lithiation additive has to irreversibly release extra Li + in the working potential range of the cathode active material, exhibit a high volumetric and gravimetric capacity, does not result in strong dead weight residues after use, and be only electrochemically active in the first charge of a LIB cell to compensate for ALL due to SEI formation at the anode surface. [ 7a ] Several lithium compounds have been investigated as cathode additives so far, including binary compounds, such as Li 2 S, [ 14 ] Li 3 N, [ 15 ] LiN 3 , [ 16 ] Li 2 O, [ 17 ] Li 2 O 2 , [ 18 ] and LiF, [ 19 ] as well as ternary compounds, such as Li 5 FeO 4 , [ 20 ] Li 2 NiO 2 , [ 21 ] Li 6 CoO 4 , [ 22 ] and Li 2 MoO 3 . [ 23 ] However, most of these additives are unstable in ambient atmosphere or incompatible with standard cathode processing protocols, e.g., using N ‐methyl‐2‐pyrrolidone (NMP) as solvent.…”