4.8 Article

Ni-Doped Layered Manganese Oxide as a Stable Cathode for Potassium-Ion Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 9, Pages 10490-10495

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22237

Keywords

potassium-ion batteries; rate capability; nickel doping; Jahn-Teller effect; structural deterioration

Funding

  1. National Key R&D Program of China [2018YFB0104300]
  2. NSF of China [51802149, 21633003]
  3. NSF of Jiangsu Province, China [BK20170630]

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Potassium-ion batteries (PIBs) are one of the promising alternatives to lithium-ion batteries (LIBs). Layered potassium manganese oxides are more attractive as cathodes for PIBs due to their high capacity, low cost, and simple synthesis method but suffer from the Jahn-Teller effect of Mn3+ in material synthesis. Here, a layered P3-type K0.62Mn0.83Ni0.17O2 material with a suppressed Jahn-Teller effect was successfully synthesized. K0.62Mn0.83Ni0.17O2 delivers a specific capacity of 122 mAh at 20 mA g(-1) in the first discharge, superior rate performance, and good cycling stability (75% capacity retention cycled at a high rate of 500 mA after 200 cycles). Besides, the K ion diffusion coefficient of the K0.62Mn0.83Ni0.17O2 electrode can reach 10(-11) cm(2) s(-1), which are larger than the Ni-free electrode. The X-ray diffraction and electron diffraction analyses demonstrate that appropriate nickel could suppress the Jahn-Teller effect and reduce the structural deterioration, resulting in more migration pathways for K ions, thus enhancing the rate capability and cycling performance. These results provide a strategy to develop high-performance cathode materials for PIBs and deepen the understanding of structural deterioration in layered manganese-based oxides.

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