Enhancing Lithium Storage Performances of the Li4Ti5O12 Anode by Introducing the CuV2O6 Phase

Rui Wang; Xiaoyu Cao; Dexing Zhao; Limin Zhu; Lingling Xie; Jingjing Li; Yongxia Miao

doi:10.1021/acsami.0c10603

Enhancing Lithium Storage Performances of the Li₄Ti₅O₁₂ Anode by Introducing the CuV₂O₆ Phase

ACS Appl Mater Interfaces. 2020 Sep 2;12(35):39170-39180. doi: 10.1021/acsami.0c10603. Epub 2020 Aug 18.

Authors

Rui Wang^{1

2}, Xiaoyu Cao^{1

2}, Dexing Zhao^{1

2}, Limin Zhu^{1

2}, Lingling Xie^{3

2}, Jingjing Li^{1

2}, Yongxia Miao^{1

2}

Affiliations

¹ School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
² Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City, Henan University of Technology, Zhengzhou 450001, PR China.
³ School of Environmental Engineering, Henan University of Technology, Zhengzhou 450001, PR China.

PMID: 32805946
DOI: 10.1021/acsami.0c10603

Abstract

The low electronic conductivity of spinel-structured Li₄Ti₅O₁₂ could be improved by introducing CuV₂O₆. Herein, several Li₄Ti₅O₁₂/CuV₂O₆ composites with different CuV₂O₆ contents have been successfully prepared by a facile liquid-phase dispersion technique. The amount of CuV₂O₆ in composites is shown to affect the particle size and electrochemical performances of Li₄Ti₅O₁₂. The Li₄Ti₅O₁₂/CuV₂O₆ composite prepared with a 5 wt % CuV₂O₆ content (referred to as 5 wt % Li₄Ti₅O₁₂/CuV₂O₆) exhibits the best electrochemical performances among all the Li₄Ti₅O₁₂/CuV₂O₆ composites. The initial discharge/charge capacities of the 5 wt % Li₄Ti₅O₁₂/CuV₂O₆ composite reach 241.1/199.8 mAh g^-1 and retain at 136.8/135.7 mAh g^-1 over 500 cycles at 30 mA g^-1 between 1.0 and 3.0 V. In addition, initial discharge/charge capacities of the 5 wt % Li₄Ti₅O₁₂/CuV₂O₆ composite amount to 129.8/90.5 mAh g^-1 even at 1200 mA g^-1 with maintained discharge/charge capacities of 71.1/71.1 mAh g^-1 over 2500 cycles, which are superior to the pristine Li₄Ti₅O₁₂ in all cases. The detailed electrode kinetic analysis reveals that the introduction of the CuV₂O₆ phase can enhance the lithium-ion transferring rate and cycling stability of Li₄Ti₅O₁₂. The enhanced lithium-storage mechanism of the 5 wt % Li₄Ti₅O₁₂/CuV₂O₆ composite is clarified by in situ X-ray diffraction (XRD) analysis. The acquired data confirms that in situ formation of small amounts of metallic Cu during discharge/charge processes highly enhance the electronic conductivity and decreases the charge-transfer resistance of Li₄Ti₅O₁₂. In sum, the as-obtained 5 wt % Li₄Ti₅O₁₂/CuV₂O₆ composite has potential for future construction of high-rate and long-lifespan anode materials for Li-ion batteries. The work also provides an innovative route to improve electrochemical performances of Li₄Ti₅O₁₂.

Keywords: Li-ion batteries; Li4Ti5O12/CuV2O6 composites; anode materials; enhanced lithium storage performances; liquid-phase dispersion technique.