Lu Di, Yao Zhujun, Zhong Yu, Wang Xiuli, Xia Xinhui, Gu Changdong, Wu Jianbo, Tu Jiangping
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
Zhejiang Provincial Key Laboratory for Cutting Tools, School of Materials Science and Engineering , Taizhou University , Taizhou 318000 , China.
ACS Appl Mater Interfaces. 2019 May 1;11(17):15630-15637. doi: 10.1021/acsami.9b02555. Epub 2019 Apr 22.
Advanced electrode materials play a very important role in the development of large-scale production of sodium-ion batteries. Herein, NaMnO hollow microspheres with diameters of 2 μm and a shell thickness of 200 nm are prepared and then modified by polypyrrole (PPy) coating. As cathodes for sodium-ion batteries, the designed PPy-coated sodium manganate hollow microspheres demonstrate enhanced electrochemical performances, with an initial capacity of 165.1 mAh g, capacity retention of 88.6% at 0.1 A g after 100 cycles, and improved rate capability. The excellent electrochemical properties are attributed to the improved electroconductivity and the high stability of hollow spherical structure of sodium manganate oxide particles due to the introduction of conductive polymer coating.
先进的电极材料在大规模生产钠离子电池的发展中起着非常重要的作用。在此，制备了直径为2μm、壳厚度为200nm的NaMnO空心微球，然后通过聚吡咯（PPy）涂层进行改性。作为钠离子电池的阴极，设计的PPy包覆锰酸钠空心微球表现出增强的电化学性能，初始容量为165.1 mAh g，在0.1 A g下循环100次后容量保持率为88.6%，并且倍率性能得到改善。优异的电化学性能归因于导电聚合物涂层的引入提高了电导率以及锰酸钠氧化物颗粒空心球形结构的高稳定性。
