CoSnO3 Nanocubes Wrapped by Carbon Nanofibers for Improving Lithium‐Sulfur Battery Performances. Issue 35 (17th September 2021) - Shi, Jing
Abstract: To solve the problem of low conductivity of sulfur and "shuttle effect" of lithium polysulfides, CoSnO3 nanocubes wrapped by carbon nanofibers (CoSnO3 @CNFs) are synthesized by co‐precipitation, electrospinning and calcination techniques. CoSnO3 provides plentiful polar active sites, which restrains the dissolution of polysulfides with chemical interaction. Carbon nanofibers not only provide more ion transport channels, but also increase physical adsorption, provide active sites, and improve the conductivity of the electrode material. As a result, CoSnO3 @CNFs can carry about 60 % sulfur as guest. Evaluated as cathode material for lithium‐sulfur batteries, CoSnO3 @CNFs/S displayed an initial discharge capacity of 554.9 mA h g −1 at 0.2 C, and retained 300.0 mA h g −1 after 200 cycles. The simple synthesis method, high sulfur loading capacity and long cycle life make CoSnO3 @CNFs extremely attractive for practical applications. Abstract : CoSnO3 nanocubes wrapped by carbon nanofibers are fabricated via co‐precipitation followed by electrospinning and calcination process. Deriving from the synergistic effect of CoSnO3 as polar active sites for adsorbing polysulfides and carbon nanofibers as structural matrix for efficient charge/mass transport, improved conductivity, volume expansion tolerance and restrained shuttle effect are achieved, which lead to high performances as cathode material for lithium‐sulfur batteries.