An interlayer composed of porous carbon sheet embedded with TiO2 nanoparticles for stable and high rate lithium-sulfur batteries
The shuttling of lithium polysulfides (LiPSs) in lithium-sulfur (Li-S) batteries results in low sulfur utilization and fast capacity decay, hindering their practical applications. Constructing an interlayer is an efficient way to block the LiPSs shuttling, but keeping the low Li ion diffusion resistance with such an interlayer is hard to achieve. Herein, a thin porous carbon nanosheet embedded with TiO2 nanoparticles (denoted PCNS-TiO2) was used to fabricate the interlayer on the separator, which effectively solves the above problems. The PCNS-TiO2 was prepared by using the Ti3C2Tx MXene as the two-dimensional (2D) template directing the porous carbon sheet formation, and the Ti3C2Tx transformed into the TiO2 NPs embedded in the PCNS. The decomposition of MXene eliminates the ion blocking effect by the 2D nanosheet structure. The thin and hierarchical porous structure allows the fast Li ion diffusion across the interlayer, and at the same time, the porous structure and the strong adsorption ability of TiO2 effectively block the LiPSs diffusion. Thus, the Li-S battery with such an interlayer shows good rate performance with a high capacity of 627 mAh g-1 at 2 C. Meanwhile, the stable cycling performance is also achieved, showing a low capacity decay of 0.063% per cycle after 300 cycles at 0.5 C.
- This article is part of the themed collection: 2020 Nanoscale HOT Article Collection