Facile synthesis of Ni11(HPO3)8(OH)6/rGO nanorods with enhanced electrochemical performance for aluminum-ion batteries

Jiguo Tu; Haiping Lei; Mingyong Wang; Zhijing Yu; Shuqiang Jiao

doi:10.1039/c8nr06380j

Facile synthesis of Ni₁₁(HPO₃)₈(OH)₆/rGO nanorods with enhanced electrochemical performance for aluminum-ion batteries

Nanoscale. 2018 Dec 7;10(45):21284-21291. doi: 10.1039/c8nr06380j. Epub 2018 Nov 13.

Authors

Jiguo Tu¹, Haiping Lei, Mingyong Wang, Zhijing Yu, Shuqiang Jiao

Affiliation

¹ State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, PR China. mywang@ustb.edu.cn sjiao@ustb.edu.cn.

PMID: 30422135
DOI: 10.1039/c8nr06380j

Abstract

The electrochemical behaviors of the ultrashort nickel phosphite nanorods supported on reduced graphene oxide (Ni₁₁(HPO₃)₈(OH)₆/rGO nanorods), as a candidate for cathodic applications in aluminum-ion batteries, are firstly investigated. Ni₁₁(HPO₃)₈(OH)₆/rGO nanorods are synthesized by a facile solvothermal process. Ni₁₁(HPO₃)₈(OH)₆ and Ni₁₁(HPO₃)₈(OH)₆/rGO cathodes both possess very high initial discharge capacities of 132.4 and 182.0 mA h g^-1 at a current density of 200 mA g^-1, respectively. In addition, the long-term cycling stability of the Ni₁₁(HPO₃)₈(OH)₆/rGO cathode is further evaluated, exhibiting a discharge capacity of 49.2 mA h g^-1 even over 1500 cycles. More importantly, the redox reaction mechanism of the Ni₁₁(HPO₃)₈(OH)₆ cathode for aluminum-ion batteries revealed that Ni₁₁(HPO₃)₈(OH)₆ is partially substituted with Al³⁺ to form Al_mNi_n(HPO₃)₈(OH)₆ and metallic Ni in the nanorod-like Ni₁₁(HPO₃)₈(OH)₆ cathodes during the discharge process. These findings are of great significance for the further development of novel materials for aluminum-ion batteries.