Yue Chen , Zhaomeng Liu , Yue Lu , Xuan-Wen Gao , Jun-Long Zhou , Xuan-Chen Wang , Qin-Fen Gu , Wen-Bin Luo
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引用次数: 0
Abstract
Potassium Metal Batteries (KMBs) are emerging as favorable candidates for next-generation high-efficiency energy storage technologies, due to their impressive specific capacity, low redox potential, and the abundance of K. Nevertheless, challenges such as dendrite growth and considerable volume expansion have been hindering in their commercial utilization. Herein, a lightweight and self-supporting flexible three-dimensional (3D) composite host with porous metal–organic frameworks and carbon-nanotube (CNT@ZIF-8) is developed. The unique design of CNT@ZIF-8 composite host offers a multitude of potassiophilic N/Zn active nuleation sites, extensive surface area, and a porous structure. These features play a pivotal role in the management of K transport dynamics, facilitating K+ prestoring and predistribution. Benefiting from the narrowed concentration polarization and uniform nucleation, a dendrite-free K metal anode is constructed. The K@CNT@ZIF-8 anode demonstrates a remarkable durability, operating for 3200 h under 0.35 mA cm−2 and 0.35 mAh·cm−2 conditions, while also maintaining stability over 650 h at 1.0 mA cm−2 and 1.0 mAh·cm−2. Additionally, the full cell of PTCDA||K@CNT@ZIF-8 variant exhibits a boosted cycling stability (88 mAh g−1 at 5 C after 1000 cycles) and rate performance (98 mAh g−1 at 20 C). The results underscore the immense potential of CNT@ZIF-8 in facilitating practical applications for energy storage.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems