Nb-doped and Al2O3 + B2O3-coated granular secondary LiMn2O4 particles as cathode materials for lithium-ion batteries

Chunliu Li; Linchao Zhang; Junfeng Yang; Zhuoming Xie; Tao Zhang; Jianxin Wang; Qianfeng Fang; Xianping Wang

doi:10.1039/c8ra09407a

Nb-doped and Al₂O₃ + B₂O₃-coated granular secondary LiMn₂O₄ particles as cathode materials for lithium-ion batteries

RSC Adv. 2019 Jan 25;9(6):3436-3442. doi: 10.1039/c8ra09407a. eCollection 2019 Jan 22.

Authors

Chunliu Li^{1

2}, Linchao Zhang¹, Junfeng Yang¹, Zhuoming Xie¹, Tao Zhang¹, Jianxin Wang³, Qianfeng Fang^{1

2}, Xianping Wang¹

Affiliations

¹ Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences Hefei 230031 PR China jfyang@issp.ac.cn xpwang@issp.ac.cn.
² Department of Materials Science and Engineering, University of Science and Technology of China Hefei 230026 PR China.
³ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 PR China.

Abstract

In this work, to improve the cyclability and high-temperature performance of cubic spinel LiMn₂O₄ (LMO) as cathode materials, Nb⁵⁺-doped LiMn₂O₄ powders coated and uncoated with Al₂O₃ and/or B₂O₃ were synthesized via the modified solid-state reaction method. It was found that Nb⁵⁺-doped and B₂O₃ + Al₂O₃-coated LMO powders comprising 5 μm granular agglomerated fine primary particles smaller than 350 nm in diameter exhibited superior electrochemical properties with initial discharge capacity of 101.68 mA h g^-1; we also observed capacity retention of 96.31% after 300 cycles at room temperature (RT) and that of 98% after 50 cycles at 55 °C and 1C rate.