Jiao Xun, Tang Xiaoxia, Li Jinrui, Xiang Yujiao, Li Cunpu, Tong Cheng, Shao Minhua, Wei Zidong
State Key Laboratory of Advanced Chemical Power Sources, School of Chemistry and Chemical Engineering China
Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong.
Chem Sci. 2024 May 1;15(21):7949-7964. doi: 10.1039/d4sc02420f. eCollection 2024 May 29.
Lithium-sulfur batteries (LSBs) with two typical platforms during discharge are prone to the formation of soluble lithium polysulfides (LiPS), leading to a decrease in the cycling life of the battery. Under practical working conditions, the transformation of S into LiS is cross-executed rather than a stepwise reaction, where the liquid LiPS to solid LiS conversion can occur at a high state of charge (SOC) to maintain the current requirement. Therefore, advancing LiS deposition can effectively reduce the accumulation of LiPSs and ultimately improve the reaction kinetics. Herein, a "butterfly material" GeS-MoS/rGO is used as a sulfur host. Rich catalytic heterointerfaces can be obtained the abundant S-S bonds formed between GeS and MoS. MoS (left wing) can enhance LiPS adsorption, while the lattice-matching nature of 2 GeS (right wing) and 3̄ LiS can induce multiple nucleation and regulate the 3D growth of LiS. LiS deposition can be advanced to occur at 80% SOC, thereby effectively inhibiting the accumulation of soluble LiPSs. Attributed to the synergistic effect of catalytic and lattice-matching properties, robust coin and pouch LSBs can be achieved.
具有两个典型放电平台的锂硫电池（LSB）易于形成可溶性多硫化锂（LiPS），导致电池循环寿命降低。在实际工作条件下，S向LiS的转化是交叉进行的，而不是逐步反应，其中液态LiPS到固态LiS的转化可以在高充电状态（SOC）下发生，以维持电流需求。因此，促进LiS沉积可以有效减少LiPS的积累，并最终改善反应动力学。在此，一种“蝴蝶材料”GeS-MoS/rGO被用作硫宿主。通过GeS和MoS之间形成的大量S-S键，可以获得丰富的催化异质界面。MoS（左翼）可以增强LiPS吸附，而2 GeS（右翼）和3̄ LiS的晶格匹配性质可以诱导多相成核并调节LiS的三维生长。LiS沉积可以在80% SOC时提前发生，从而有效抑制可溶性LiPS的积累。由于催化和晶格匹配性质的协同作用，可以实现坚固的硬币型和软包型锂硫电池。
