Yao Weiqi, Tian Chengxiang, Yang Chao, Xu Jie, Meng Yufeng, Manke Ingo, Chen Nan, Wu Ziling, Zhan Liang, Wang Yanli, Chen Renjie
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore.
Adv Mater. 2022 Mar;34(11):e2106370. doi: 10.1002/adma.202106370. Epub 2022 Feb 3.
Lithium-sulfur (Li-S) batteries have been hindered by the shuttle effect and sluggish polysulfide conversion kinetics. Here, a P-doped nickel tellurium electrocatalyst with Te-vacancies (P⊂NiTe ) anchored on maize-straw carbon (MSC) nanosheets, served as a functional layer (MSC/P⊂NiTe ) on the separator of high-performance Li-S batteries. The P⊂NiTe electrocatalyst enhanced the intrinsic conductivity, strengthened the chemical affinity for polysulfides, and accelerated sulfur redox conversion. The MSC nanosheets enabled NiTe nanoparticle dispersion and Li diffusion. In situ Raman and ex situ X-ray absorption spectra confirmed that the MSC/P⊂NiTe restrained the shuttle effect and accelerated the redox conversion. The MSC/P⊂NiTe -based cell has a cyclability of 637 mAh g at 4 C over 1800 cycles with a degradation rate of 0.0139% per cycle, high rate performance of 726 mAh g at 6 C, and a high areal capacity of 8.47 mAh cm under a sulfur configuration of 10.2 mg cm , and a low electrolyte/sulfur usage ratio of 3.9. This work demonstrates that vacancy-induced doping of heterogeneous atoms enables durable sulfur electrochemistry and can impact future electrocatalytic designs related to various energy-storage applications.
锂硫（Li-S）电池一直受到穿梭效应和缓慢的多硫化物转化动力学的阻碍。在此，一种具有碲空位的磷掺杂碲化镍电催化剂（P⊂NiTe ）锚定在玉米秸秆碳（MSC）纳米片上，用作高性能锂硫电池隔膜上的功能层（MSC/P⊂NiTe ）。P⊂NiTe 电催化剂提高了本征电导率，增强了对多硫化物的化学亲和力，并加速了硫的氧化还原转化。MSC纳米片实现了碲化镍纳米颗粒的分散和锂的扩散。原位拉曼光谱和非原位X射线吸收光谱证实，MSC/P⊂NiTe 抑制了穿梭效应并加速了氧化还原转化。基于MSC/P⊂NiTe 的电池在4 C下1800次循环中具有637 mAh g的循环稳定性，每循环的降解率为0.0139%，在6 C下具有726 mAh g的高倍率性能，在硫负载为10.2 mg cm 时具有8.47 mAh cm 的高面积容量，以及3.9的低电解质/硫使用比。这项工作表明，空位诱导的异质原子掺杂能够实现持久的硫电化学，并可能影响未来与各种储能应用相关的电催化设计。
