Structure and electrochemical performance modulation of a LiNi0.8Co0.1Mn0.1O2 cathode material by anion and cation co-doping for lithium ion batteries

Rong Li; Yong Ming; Wei Xiang; Chunliu Xu; Guilin Feng; Yongchun Li; Yanxiao Chen; Zhenguo Wu; Benhe Zhong; Xiaodong Guo

doi:10.1039/c9ra07873h

Structure and electrochemical performance modulation of a LiNi_0.8Co_0.1Mn_0.1O₂ cathode material by anion and cation co-doping for lithium ion batteries

RSC Adv. 2019 Nov 12;9(63):36849-36857. doi: 10.1039/c9ra07873h. eCollection 2019 Nov 11.

Authors

Rong Li¹, Yong Ming¹, Wei Xiang², Chunliu Xu¹, Guilin Feng¹, Yongchun Li¹, Yanxiao Chen¹, Zhenguo Wu^{1

3}, Benhe Zhong¹, Xiaodong Guo^{1

4}

Affiliations

¹ School of Chemical Engineering, Sichuan University Chengdu 610065 P. R. China.
² College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology Chengdu 610059 P. R. China.
³ State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 P. R. China.
⁴ Institute for Superconducting and Electronic Materials, University of Wollongong Wollongong NSW 2522 Australia.

Abstract

Ni-rich layered transition metal oxides show great energy density but suffer poor thermal stability and inferior cycling performance, which limit their practical application. In this work, a minor content of Co and B were co-doped into the crystal of a Ni-rich cathode (LiNi_0.8Co_0.1Mn_0.1O₂) using cobalt acetate and boric acid as dopants. The results analyzed by XRD, TEM, XPS and SEM reveal that the modified sample shows a reduced energy barrier for Li⁺ insertion/extraction and alleviated Li⁺/Ni²⁺ cation mixing. With the doping of B and Co, corresponding enhanced cycle stability was achieved with a high capacity retention of 86.1% at 1.0C after 300 cycles in the range of 2.7 and 4.3 V at 25 °C, which obviously outperformed the pristine cathode (52.9%). When cycled after 300 cycles at 5C, the material exhibits significantly enhanced cycle stability with a capacity retention of 81.9%. This strategy for the enhancement of the electrochemical performance may provide some guiding significance for the practical application of high nickel content cathodes.