am9b20317_si_001.pdf (1.45 MB)
Interfacial Superassembly of Grape-Like MnO–Ni@C Frameworks for Superior Lithium Storage
journal contribution
posted on 2020-02-25, 19:45 authored by Chuanxin Hou, Jun Wang, Weibin Zhang, Jiajia Li, Runhao Zhang, Junjie Zhou, Yuqi Fan, Dajian Li, Feng Dang, Jiaqing Liu, Yong Li, Kang Liang, Biao KongDespite the excellent electrochemical
performance of MnO-based
electrodes, a large capacity increase cannot be avoided during long-life
cycling, which makes it difficult to seek out appropriate cathode
materials to match for commercial applications. In this work, a grape-like
MnO–Ni@C framework from interfacial superassembly with remarkable
electrochemical properties was fabricated as anode materials for lithium-ion
batteries. Electrochemical analysis indicates that the introduction
of Ni not only contributes to the excellent rate capability and high
specific capacity but also prevents further oxidation of MnO to the
higher valence states for ultrastable long-life cycling performance.
Furthermore, thermodynamic calculation proves that the ultrastable
long cycling life of the Ni–Mn–O system originated from
a buffer composition region to stabilize the MnO structure. Because
of the unique grape-like structure and performance of the Ni–Mn–O
system, the MnO–Ni@C electrode displayed an invertible specific
capacity of 706 mA h g–1 after 200 cycles at a current
density of 0.1 A g–1 and excellent cycling stability
maintained a capacity of 476.8 mA h g–1 after 2100
cycles at 1.0 A g–1 without obvious capacity change.
This new nanocomposite material could offer a novel fabrication strategy
and insight for MnO-based materials and other metal oxides as anodes
for improved electrochemical performance.