Sulfur-terminated Tin Oxide for Durable, Highly Reversible Storage of Large-Capacity Lithium
Convertible reactant anodes such as SnO2, GeO2, In2O3, and ZnO offer unusually large capacity for lithium ion batteries (LIBs) but all suffer from a huge volume expansion which triggers internal fracture and reconfiguration. Herein, sulfur-termination as a shifting paradigm to relieve volume expansion is proposed. Sulfur-termination strategy is expected to setting each metal nanocrystal into a conducting container during reduction process and plenty of containers are physically separate from each other but are electrically wired to the current collector. To put the strategy into practice, sulfur-terminated tin oxide (SnO2-x-S) nanocrystals as reactants are demonstrated to resist coarsening and reconfiguration throughout cycling. Such LIB anodes with the addition of conductive supporter provide 1010 mA h g-1 at 2 A g-1 after 800 cycles, breaking new ground on multiple fronts for this promising anode class.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry A HOT Papers