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Liu L, Liang J, Wang W, Han C, Xia Q, Ke X, Liu J, Gu Q, Shi Z, Chou S, Dou S, Li W. A P3-Type K 1/2Mn 5/6Mg 1/12Ni 1/12O 2 Cathode Material for Potassium-Ion Batteries with High Structural Reversibility Secured by the Mg-Ni Pinning Effect. ACS Appl Mater Interfaces 2021; 13:28369-28377. [PMID: 34107212 DOI: 10.1021/acsami.1c07220] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Mn-based layered oxides are very attractive as cathodes for potassium-ion batteries (PIBs) due to their low-cost and environmentally friendly precursors. Their transfer to practical application, however, is inhibited by some issues including consecutive phase transitions, sluggish K+ deintercalation/intercalation, and serious capacity loss. Herein, Mg-Ni co-substituted K1/2Mn5/6Mg1/12Ni1/12O2 is designed as a promising cathode material for PIBs, with suppressed phase transitions that occurred in K1/2MnO2 and improved K+ storage performance. Part of Mg2+ and Ni2+ occupies the K+ layer, playing the role of a "nailed pillar", which restrains metal oxide layer gliding during the K+ (de)intercalation. The "Mg-Ni pinning effect" not only suppresses the phase transitions but also reduces the cell volume variation, leading to the improved cycle performance. Moreover, K1/2Mn5/6Mg1/12Ni1/12O2 has low activation barrier energy for K+ diffusion and high electron conductivity as demonstrated by first-principles calculations, resulting in better rate capability. In addition, K1/2Mn5/6Mg1/12Ni1/12O2 also delivers a higher reversible capacity owing to the participation of the Ni element in electrochemical reactions and the pseudocapacitive contribution. This study provides a basic understanding of structural evolution in layered Mn-based oxides and broadens the strategic design of cathode materials for PIBs.
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Affiliation(s)
- Liying Liu
- School of Materials and Energy, Smart Energy Research Centre, Guangdong University of Technology, Guangzhou 510006, China
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Jinji Liang
- School of Materials and Energy, Smart Energy Research Centre, Guangdong University of Technology, Guangzhou 510006, China
| | - Wanlin Wang
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Chao Han
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Qingbing Xia
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Xi Ke
- School of Materials and Energy, Smart Energy Research Centre, Guangdong University of Technology, Guangzhou 510006, China
| | - Jun Liu
- School of Materials and Energy, Smart Energy Research Centre, Guangdong University of Technology, Guangzhou 510006, China
| | - Qinfen Gu
- Australia Synchrotron (ANSTO), Clayton 3168, Australia
| | - Zhicong Shi
- School of Materials and Energy, Smart Energy Research Centre, Guangdong University of Technology, Guangzhou 510006, China
| | - Shulei Chou
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Shixue Dou
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Weijie Li
- Institute for Superconducting & Electronic Materials, AIIM Building, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
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