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Title: Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries

Abstract

P2-type sodium layered transition metal oxides have been intensively investigated as promising cathode materials for sodium-ion batteries (SIBs) by virtue of their high specific capacity and high operating voltage. However, they suffer from problems of voltage decay, capacity fading, and structural deterioration, which hinder their practical application. Therefore, a mechanistic understanding of the cationic/anionic redox activity and capacity fading is indispensable for the further improvement of electrochemical performance. Here, a prototype cathode material of P2-type Na0.6Mg0.3Mn0.7O2 is comprehensively investigated, which presents both cationic and anionic redox behaviors during the cycling process. By a combination of soft X-ray absorption spectroscopy and electroanalytical methods, we unambiguously reveal that only oxygen redox reaction is involved in the initial charge process, then both oxygen and manganese participate in the charge compensation in the following discharge process. In addition, a gradient distribution of Mn valence state from surface to bulk is disclosed, which could be mainly related to the irreversible oxygen activity during the charge process. Furthermore, we find that the average oxidation state of Mn is reduced upon extended cycles, leading to the noticeable capacity fading. Our results provide deeper insights into the intrinsic cationic/anionic redox mechanism of P2-type materials, which is vital formore » the rational design and optimization of advanced cathode materials for SIBs.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [1];  [5]
  1. Soochow Univ., Taipai (Taiwan)
  2. Tianjin Normal University (China)
  3. Zhengzhou University (China)
  4. Chinese Academy of Sciences (CAS), Shanghai (China)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1780750
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Energies
Additional Journal Information:
Journal Volume: 13; Journal Issue: 21; Journal ID: ISSN 1996-1073
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; sodium-ion batteries; P2-tpye oxides; charge compensation mechanism; X-ray absorption spectroscopy; electronic structure

Citation Formats

Cheng, Chen, Ding, Manling, Yan, Tianran, Dai, Kehua, Mao, Jing, Zhang, Nian, Zhang, Liang, and Guo, Jinghua. Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries. United States: N. p., 2020. Web. doi:10.3390/en13215729.
Cheng, Chen, Ding, Manling, Yan, Tianran, Dai, Kehua, Mao, Jing, Zhang, Nian, Zhang, Liang, & Guo, Jinghua. Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries. United States. https://doi.org/10.3390/en13215729
Cheng, Chen, Ding, Manling, Yan, Tianran, Dai, Kehua, Mao, Jing, Zhang, Nian, Zhang, Liang, and Guo, Jinghua. Mon . "Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries". United States. https://doi.org/10.3390/en13215729. https://www.osti.gov/servlets/purl/1780750.
@article{osti_1780750,
title = {Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries},
author = {Cheng, Chen and Ding, Manling and Yan, Tianran and Dai, Kehua and Mao, Jing and Zhang, Nian and Zhang, Liang and Guo, Jinghua},
abstractNote = {P2-type sodium layered transition metal oxides have been intensively investigated as promising cathode materials for sodium-ion batteries (SIBs) by virtue of their high specific capacity and high operating voltage. However, they suffer from problems of voltage decay, capacity fading, and structural deterioration, which hinder their practical application. Therefore, a mechanistic understanding of the cationic/anionic redox activity and capacity fading is indispensable for the further improvement of electrochemical performance. Here, a prototype cathode material of P2-type Na0.6Mg0.3Mn0.7O2 is comprehensively investigated, which presents both cationic and anionic redox behaviors during the cycling process. By a combination of soft X-ray absorption spectroscopy and electroanalytical methods, we unambiguously reveal that only oxygen redox reaction is involved in the initial charge process, then both oxygen and manganese participate in the charge compensation in the following discharge process. In addition, a gradient distribution of Mn valence state from surface to bulk is disclosed, which could be mainly related to the irreversible oxygen activity during the charge process. Furthermore, we find that the average oxidation state of Mn is reduced upon extended cycles, leading to the noticeable capacity fading. Our results provide deeper insights into the intrinsic cationic/anionic redox mechanism of P2-type materials, which is vital for the rational design and optimization of advanced cathode materials for SIBs.},
doi = {10.3390/en13215729},
journal = {Energies},
number = 21,
volume = 13,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2020},
month = {Mon Nov 02 00:00:00 EST 2020}
}

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