Polypyrrole-Coated Sodium Manganate Hollow Microspheres as a Superior Cathode for Sodium Ion Batteries

Di Lu; Zhujun Yao; Yu Zhong; Xiuli Wang; Xinhui Xia; Changdong Gu; Jianbo Wu; Jiangping Tu

doi:10.1021/acsami.9b02555

Polypyrrole-Coated Sodium Manganate Hollow Microspheres as a Superior Cathode for Sodium Ion Batteries

ACS Appl Mater Interfaces. 2019 May 1;11(17):15630-15637. doi: 10.1021/acsami.9b02555. Epub 2019 Apr 22.

Authors

Di Lu¹, Zhujun Yao¹, Yu Zhong¹, Xiuli Wang¹, Xinhui Xia¹, Changdong Gu¹, Jianbo Wu², Jiangping Tu¹

Affiliations

¹ 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.
² Zhejiang Provincial Key Laboratory for Cutting Tools, School of Materials Science and Engineering , Taizhou University , Taizhou 318000 , China.

PMID: 30973004
DOI: 10.1021/acsami.9b02555

Abstract

Advanced electrode materials play a very important role in the development of large-scale production of sodium-ion batteries. Herein, Na_0.7MnO_2.05 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^-1, capacity retention of 88.6% at 0.1 A g^-1 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.

Keywords: electrochemical property; hollow microsphere; polypyrrole; sodium manganate; sodium-ion battery.