Li Dan, Zhang Jiaqi, Ahmed Syed Musab, Suo Guoquan, Wang Wei Alex, Feng Lei, Hou Xiaojiang, Yang Yanling, Ye Xiaohui, Zhang Li
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China; School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, China.
J Colloid Interface Sci. 2020 Aug 15;574:174-181. doi: 10.1016/j.jcis.2020.04.045. Epub 2020 Apr 11.
Potassium-ion batteries (KIBs) have becoming a prospective energy storage technique, due to the abundant potassium resources in the earth crust, approximate redox potential and similar electrochemical behavior of potassium and lithium. However, the insufficient capacity, poor stability and volume expansion of electrode materials during charge and discharge are main factors restricting the further development of KIBs. This work reports an amorphous carbon coated SnO nanohseets on hard carbon hollow spheres (AC/SnO@HCHS) anode with enhanced potassium storage performance. The HCHS acts as a carrier for SnO nanosheets, providing high electrical conductivity and stable skeleton. The self-assembled SnO nanosheets with high surface area ensures sufficient contact with the electrolyte. Amorphous carbon wrapping can not only relieve SnO volume expansion but also provide surface-induced capacitive capacity. As a consequence, the AC/SnO@HCHS anode presents excellent potassium-ion storage performance with high discharge capacity of 346 mAh g at 0.1 A g over 200 cycles, ultra-long cycling lifetime and outstanding rate capability (236 mAh g at 1 A g over 1000 cycles).
钾离子电池（KIBs）由于地壳中丰富的钾资源、相近的氧化还原电位以及钾和锂相似的电化学行为，正成为一种具有前景的储能技术。然而，电极材料在充放电过程中容量不足、稳定性差和体积膨胀是限制钾离子电池进一步发展的主要因素。本文报道了一种在硬碳空心球（AC/SnO@HCHS）阳极上包覆非晶碳的SnO纳米片，其具有增强的钾存储性能。硬碳空心球作为SnO纳米片的载体，提供高导电性和稳定的骨架。具有高比表面积的自组装SnO纳米片确保与电解质充分接触。非晶碳包覆不仅可以缓解SnO的体积膨胀，还能提供表面诱导电容。因此，AC/SnO@HCHS阳极具有优异的钾离子存储性能，在0.1 A g下200次循环的放电容量高达346 mAh g，具有超长的循环寿命和出色的倍率性能（在1 A g下1000次循环时为236 mAh g）。
