Nickel substituted LiMn2O4 cathode with durable high-rate capability for Li-ion batteries

Yun Xu; Gen Chen; Engang Fu; Meng Zhou; Marco Dunwell; Ling Fei; Shuguang Deng; Paul Andersen; Yongqiang Wang; Quanxi Jia; Hongmei Luo

doi:10.1039/C3RA42223B

Nickel substituted LiMn₂O₄ cathode with durable high-rate capability for Li-ion batteries

Yun Xu,^a Gen Chen,^a Engang Fu,^b Meng Zhou,^a Marco Dunwell,^a Ling Fei,^a Shuguang Deng,^a Paul Andersen,^a Yongqiang Wang,^c Quanxi Jia^d and Hongmei Luo*^a

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* Corresponding authors

^a Department of Chemical Engineering, New Mexico State University, Las Cruces, New Mexico, United States
E-mail: hluo@nmsu.edu

^b State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, P. R. China

^c Material Science Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA

^d Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Abstract

Spinel LiMn_2−xNi_xO₄ (x = 0, 0.1, 0.2) nanoparticles were prepared through a simple one-step polymer-assisted chemical solution method. When x = 0.1, the cathode exhibited the best durable rate capability, with 100% of the capacity retained (∼100 mAh g⁻¹) after 400 cycles at 10 C current rate. The excellent cyclability and rate capability originate from the thin carbon layer automatically formed from incomplete depolymerisation of polymers and the improved conductivity due to the nickel dopant. The improved conductivity was confirmed by less polarization at high current rate.

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Nickel substituted LiMn₂O₄ cathode with durable high-rate capability for Li-ion batteries

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Nickel substituted LiMn₂O₄ cathode with durable high-rate capability for Li-ion batteries

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