摘要
The significant capacity deterioration and inadequate cycling lifespan that are mainly caused by the undesirable “shuttle effect” and torpid redox kinetics have encumbered the development of practically applicable lithium-sulfur (Li-S) battery technology. Modifying sulfur cathodes with lithium polysulfide (LiPS) adsorptive and electrocatalytic host materials is a promising approach to resolving these issues. Herein, a Co0.12Ni1.88S2/NiO heterostructure, which has multiple merits, is designed and serves as a sulfur host to improve the electrochemical performance of Li-S batteries. Possessing strong LiPS adsorbability and excellent electrocatalytic activity, the heterostructural Co0.12Ni1.88S2/NiO exhibits favorable synergistic effects, which effectively facilitate the anchoring and converting of diffused LiPSs. As a result, the corresponding cell delivers rapid redox kinetics and higher sulfur utilization. An impressive initial discharge capacity of 1424.8 mAh g−1 and a reversible capacity near 1056.7 mAh g−1 at 1 C over 1000 cycles are achieved with an average Coulombic efficiency of 98.8%. Benefiting from the unique nanoarchitecture and superior catalytic efficiency, only a very small amount of Co0.12Ni1.88S2/NiO (∼7 wt% in the cathode) is used as the sulfur host. The rational design of Co0.12Ni1.88S2/NiO in this work will hopefully offer inspiration for exploring advanced heterostructure materials for Li-S batteries and other electrochemical devices.
源语言 | 英语 |
---|---|
页(从-至) | 486-499 |
页数 | 14 |
期刊 | Energy Storage Materials |
卷 | 51 |
DOI | |
出版状态 | 已出版 - 10月 2022 |