期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 41, 页码 48536-48545出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11793
关键词
Li-S battery; RT-Na/S battery; metal nitride; carbon nanosheets; sulfur cathode; heterostructure
资金
- National Natural Science Foundation of China [U1703251, U1610255, 51672033]
This study designs and fabricates Ni@Ni3N/CNS as a catalyst for lithium-sulfur and room-temperature sodium-sulfur batteries, promoting the conversion and trapping of polysulfides while exhibiting excellent electrochemical performance at high rates.
Lithium-sulfur (Li-S) batteries are recognized as one of the most promising next-generation energy storage devices, but their practical application is greatly limited by several obstacles, such as the highly insulating nature and sluggish redox kinetics of sulfur and the dissolution of lithium polysulfides. Herein, three-dimensional carbon nanosheet frameworks anchored with Ni@Ni3N heterostructure nanoparticles (denoted Ni@Ni3N/CNS) are designed and fabricated by a chemical blowing and thermal nitridation strategy. It is demonstrated that the Ni@Ni3N heterostructure can effectively accelerate polysulfide conversion and promote the chemical trapping of polysulfides. Meanwhile, the carbon nanosheet frameworks of Ni@Ni3N/CNS establish a highly conductive network for fast electron transportation. The cells with Ni@Ni3N heterostructures as the catalyst in the cathode show excellent electrochemical performance, revealing stable cycling over 600 cycles with a low-capacity fading rate of 0.04% per cycle at 0.5 C and high-rate capability (594 mAh g(-1) at 3 C). Furthermore, Ni@Ni3N/CNS can also work well in room-temperature sodium-sulfur (RT-Na/S) batteries, delivering a high specific capacity (454 mAh g(-1) after 400 cycles at 0.5 C). This work provides a rational way to prepare the metal-metal nitride heterostructures to enhance the performance both of Li-S and RT-Na/S batteries.
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