School of Metallurgy and Environment, Central South University , Changsha 410083, China.
ACS Appl Mater Interfaces. 2018 Jan 31;10(4):3707-3713. doi: 10.1021/acsami.7b18645. Epub 2018 Jan 16.
The further development of lithium-sulfur (Li-S) batteries is limited by the fact that the soluble polysulfide leads to the shuttle effect, thereby reducing the cycle stability and cycle life of the batteries. To address this issue, here a thin and lightweight (8 μm and 0.24 mg cm) reduced graphene oxide@MoS (rGO@MoS) interlayer between the cathode and the commercial separator is developed as a polysulfide barrier. The rGO plays the roles of both a polysulfide physical barrier and an additional current collector, while MoS has a high chemical adsorption for polysulfides. The experiments demonstrate that the Li-S cell constructed with an rGO@MoS-coated separator shows a high reversible capacity of 1122 mAh g at 0.2 C, a low capacity fading rate of 0.116% for 500 cycles at 1 C, and an outstanding rate performance (615 mAh g at 2 C). Such an interlayer is expected to be ideal for lithium-sulfur battery applications because of its excellent electrochemical performance and simple synthesis process.
锂硫（Li-S）电池的进一步发展受到可溶性多硫化物导致穿梭效应的限制，从而降低了电池的循环稳定性和循环寿命。为了解决这个问题，在这里开发了一种薄而轻的（8 μm 和 0.24 mg cm）还原氧化石墨烯@二硫化钼（rGO@MoS）中间层作为多硫化物阻隔层，位于阴极和商业分离器之间。rGO 不仅起到多硫化物物理阻隔层的作用，还起到额外集电器的作用，而 MoS 对多硫化物具有高化学吸附能力。实验表明，用 rGO@MoS 涂层分离器构建的 Li-S 电池在 0.2 C 时具有 1122 mAh g 的高可逆容量，在 1 C 时 500 次循环的容量衰减率低至 0.116%，且具有出色的倍率性能（在 2 C 时为 615 mAh g）。由于其优异的电化学性能和简单的合成工艺，这种中间层有望成为理想的锂硫电池应用材料。
