共查询到4条相似文献,搜索用时 0 毫秒
1.
Dr. Zhuo Zhu Dr. Yinxiang Zeng Zhihao Pei Dr. Deyan Luan Prof. Xin Wang Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2023,62(31):e202305828
Lithium-sulfur (Li−S) batteries are considered as promising candidates for next-generation energy storage systems in view of the high theoretical energy density and low cost of sulfur resources. The suppression of polysulfide diffusion and promotion of redox kinetics are the main challenges for Li−S batteries. Herein, we design and prepare a novel type of ZnCo-based bimetallic metal–organic framework nanoboxes (ZnCo-MOF NBs) to serve as a functional sulfur host for Li−S batteries. The hollow architecture of ZnCo-MOF NBs can ensure fast charge transfer, improved sulfur utilization, and effective confinement of lithium polysulfides (LiPSs). The atomically dispersed Co−O4 sites in ZnCo-MOF NBs can firmly capture LiPSs and electrocatalytically accelerate their conversion kinetics. Benefiting from the multiple structural advantages, the ZnCo-MOF/S cathode shows high reversible capacity, impressive rate capability, and prolonged cycling performance for 300 cycles. 相似文献
2.
Dr. Ruijin Meng Dr. Xin He Dr. Samuel Jun Hoong Ong Chenxu Cui Prof. Shufeng Song Prof. Peerasak Paoprasert Prof. Quanquan Pang Prof. Zhichuan J. Xu Prof. Xiao Liang 《Angewandte Chemie (International ed. in English)》2023,62(38):e202309046
Passivation of the sulfur cathode by insulating lithium sulfide restricts the reversibility and sulfur utilization of Li−S batteries. 3D nucleation of Li2S enabled by radical conversion may significantly boost the redox kinetics. Electrolytes with high donor number (DN) solvents allow for tri-sulfur (S3⋅−) radicals as intermediates, however, the catastrophic reactivity of such solvents with Li anodes pose a great challenge for their practical application. Here, we propose the use of quaternary ammonium salts as electrolyte additives, which can preserve the partial high-DN characteristics that trigger the S3⋅− radical pathway, and inhibit the growth of Li dendrites. Li−S batteries with tetrapropylammonium bromide (T3Br) electrolyte additive deliver the outstanding cycling stability (700 cycles at 1 C with a low-capacity decay rate of 0.049 % per cycle), and high capacity under a lean electrolyte of 5 μLelectrolyte mgsulfur−1. This work opens a new avenue for the development of electrolyte additives for Li−S batteries. 相似文献
3.
Dr. Xiaoxiao Wang Dr. Nanping Deng Dr. Liying Wei Dr. Qi Yang Dr. Hengying Xiang Dr. Meng Wang Prof. Bowen Cheng Prof. Weimin Kang 《化学:亚洲杂志》2021,16(19):2852-2870
Lithium-sulfur (Li−S) batteries, possessing excellent theoretical capacities, low cost and nontoxicity, are one of the most promising energy storage battery systems. However, poor conductivity of elemental S and the “shuttle effect” of lithium polysulfides hinder the commercialization of Li−S batteries. These problems are closely related to the interface problems between the cathodes, separators/electrolytes and anodes. The review focuses on interface issues for advanced separators/electrolytes based on nanomaterials in Li−S batteries. In the liquid electrolyte systems, electrolytes/separators and electrodes system can be decorated by nano materials coating for separators and electrospinning nanofiber separators. And, interface of anodes and electrolytes/separators can be modified by nano surface coating, nano composite metal lithium and lithium nano alloy, while the interface between cathodes and electrolytes/separators is designed by nano metal sulfide, nanocarbon-based and other nano materials. In all solid-state electrolyte systems, the focus is to increase the ionic conductivity of the solid electrolytes and reduce the resistance in the cathode/polymer electrolyte and Li/electrolyte interfaces through using nanomaterials. The basic mechanism of these interface problems and the corresponding electrochemical performance are discussed. Based on the most critical factors of the interfaces, we provide some insights on nanomaterials in high-performance liquid or state Li−S batteries in the future. 相似文献
4.
Dr. Hongtai Li Pei Shi Lei Wang Tianran Yan Tong Guo Xiao Xia Prof. Chi Chen Prof. Jing Mao Prof. Dan Sun Prof. Liang Zhang 《Angewandte Chemie (International ed. in English)》2023,62(8):e202216286
Fundamentally understanding the structure–property relationship is critical to design advanced electrocatalysts for lithium-sulfur (Li−S) batteries, which remains a formidable challenge. Herein, by manipulating the regulable cations in spinel oxides, their geometrical-site-dependent catalytic activity for sulfur redox is investigated. Experimental and theoretical analyses validate that the modulation essence of cooperative catalysis of lithium polysulfides (LiPSs) is dominated by LiPSs adsorption competition between Co3+ tetrahedral (Td) and Mn3+ octahedral (Oh) sites on Mn3+Oh−O−Co3+Td backbones. Specifically, high-spin Co3+Td with stronger Co−S covalency anchors LiPSs persistently, while electron delocalized Mn3+Oh with adsorptive orbital (dz2) functions better in catalyzing specialized LiPSs conversion. This work inaugurates a universal strategy for sculpting geometrical configuration to achieve charge, spin, and orbital topological regulation in electrocatalysts for Li−S batteries. 相似文献