Cation and anion Co-doping synergy to improve structural stability of Li-and Mn-rich layered cathode materials for lithium-ion batteries

Chen, Guorong and An, Juan and Meng, Yiming and Yuan, Changzhou and Matthews, Bryan and Dou, Fei and Shi, Liyi and Zhou, Yongfeng and Song, Pingan and Wu, Gang and Zhang, Dengsong (2019) Cation and anion Co-doping synergy to improve structural stability of Li-and Mn-rich layered cathode materials for lithium-ion batteries. Nano Energy, 57. pp. 157-165. ISSN 2211-2855


Cobalt-free Li and Mn-rich layered cathode materials are promising for next generation lithium ion batteries due to their high specific capacity and low cost. However, these materials are facing serious issues, such as structural collapse due to volume shrinkage during Ni2+ oxidation to Ni4+ and oxygen vacancy generation over 4.5V. In this work, we report a strategy to address the issue of volume shrinkage caused by structural deformation via constructing a large-size rigid frame by simultaneously doping inactive and large radius atoms of Cd and S. This strategy significantly reduces the volume shrinkage when fully delithiated relative to the pristine material. The Cd- and S-doped cathode materials present a highly reversible structure, which were determined by using HAADF-STEM and in-situ XRD characterization. The doped Cd and S atoms act as supporting atoms and synergistically enlarge the layer spacing of crystalline from 0.455 to 0.483 nm. The in-situ XRD monitors the structural changes in real time during charging and discharging processes, further verifying structural stability during cycling. Due to the unique structural properites, an initial capacity of 268.5 mAh g−1 at 0.1 C along with a good rate capacity of 153.8 mAh g−1 at 5 C were achieved. Also, a capacity of 243.4 mAh g-1 at 0.1 C over 80 cycles indicate good cyclic stability of the co-doped Li- and Mn-rich layered cathode.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 19 Feb 2019 01:08
Last Modified: 12 Mar 2019 05:17
Uncontrolled Keywords: lLayered cathode materials; doping; Li and Mn rich; inactive frame; lithium ion battery
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
Socio-Economic Objective: B Economic Development > 85 Energy > 8506 Energy Storage, Distribution and Supply > 850602 Energy Storage (excl. Hydrogen)
Identification Number or DOI: 10.1016/j.nanoen.2018.12.049

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