151
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Deng C, Gabriel E, Skinner P, Lee S, Barnes P, Ma C, Gim J, Lau ML, Lee E, Xiong H. Origins of Irreversibility in Layered NaNi xFe yMn zO 2 Cathode Materials for Sodium Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2020; 12:51397-51408. [PMID: 33141552 DOI: 10.1021/acsami.0c13850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Layered NaNixFeyMnzO2 cathode (NFM) is of great interest in sodium ion batteries because of its high theoretical capacity and utilization of abundant, low-cost, environmentally friendly raw materials. Nevertheless, there remains insufficient understanding on the concurrent local environment evolution in each transition metal (TM) that largely influences the reversibility of the cathode materials upon cycling. In this work, we investigate the reversibility of TM ions in layered NFMs with varying Fe contents and potential windows. Utilizing ex situ synchrotron X-ray absorption near-edge spectroscopy and extended X-ray absorption fine structure of precycled samples, the valence and bonding evolution of the TMs are elucidated. It is found that Mn is electrochemically inactive, as indicated by the insignificant change of Mn valence and the Mn-O bonding distance. Fe is electrochemically inactive after the first five cycles. The Ni redox couple contributes most of the charge compensation for NFMs. Ni redox is quite reversible in the cathodes with less Fe content. However, the Ni redox couple shows significant irreversibility with a high Fe content of 0.8. The electrochemical reversibility of the NFM cathode becomes increasingly enhanced with the decrease of either Fe content or with lower upper charge cutoff potential.
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Affiliation(s)
- Changjian Deng
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Eric Gabriel
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Paige Skinner
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Sungsik Lee
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Pete Barnes
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Chunrong Ma
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Jihyeon Gim
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Miu Lun Lau
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Eungje Lee
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Hui Xiong
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center for Advanced Energy Studies (CAES), Idaho Falls, Idaho 83401, United States
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152
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Liu W, Huang H, Jiang Z, Wang J, Yang Y, Chen Z, Liu H, Huang Q, Peng R, Fu Z, Lu Y. Interfacial Titanium Diffusion Self-Adapting Layer in Ultrathin Epitaxial MnO 2/TiO 2 Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2020; 12:47010-47017. [PMID: 32966043 DOI: 10.1021/acsami.0c13532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The electrochemical performance of supercapacitors is suppressed by a large number of defects in the interface of heterostructure due to lattice mismatch. In this paper, the (001) oriented rutile MnO2 thin films with different thicknesses were grown on rutile TiO2 substrates. The lattice mismatch between film and substrate was minimized through a Ti diffusion self-adapting layer. The energy-dispersive spectroscopy mappings were used to measure the diffusion range of Ti. The results of high-resolution X-ray diffraction confirmed that the dependence of the out-of-plane lattice parameter on the thickness was consistent with the self-adapting interface model, indicating that Ti diffusion can indeed alleviate the lattice mismatch. In addition, the results of the synchrotron soft X-ray absorption spectrum indicated that the capacitance of the thin films with a large proportion of Ti diffusion increased with electrons involved in the reaction. Although the decrease of carrier density and conductivity of the thinner films depressed the electrochemical activity, it is worth mentioning that the film we designed still has considerable specific capacitance even when it is very thin, which can provide a new idea for the development of thinner and larger capacity potential micro-supercapacitors.
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Affiliation(s)
- Wenyi Liu
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Haoliang Huang
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zhongyuan Jiang
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Jianlin Wang
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yuanjun Yang
- School of Electronic Science and Applied Physics, and Lab of Quantum Materials and Interfaces, Hefei University of Technology, Hefei, Anhui 230009, P. R. China
| | - Zezhi Chen
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Huan Liu
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Qiuping Huang
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Ranran Peng
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zhengping Fu
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yalin Lu
- Anhui Laboratory of Advanced Photon Science and Technology, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
- CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, P. R. China
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153
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Gompa TP, Ramanathan A, Rice NT, La Pierre HS. The chemical and physical properties of tetravalent lanthanides: Pr, Nd, Tb, and Dy. Dalton Trans 2020; 49:15945-15987. [DOI: 10.1039/d0dt01400a] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The thermochemistry, descriptive chemistry, spectroscopy, and physical properties of the tetravalent lanthanides (Pr, Nd, Tb and Dy) in extended phases, gas phase, solution, and as isolable molecular complexes are presented.
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Affiliation(s)
- Thaige P. Gompa
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Arun Ramanathan
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Natalie T. Rice
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Henry S. La Pierre
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
- Nuclear and Radiological Engineering Program
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