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Insights into Ti doping for stabilizing the Na2/3Fe1/3Mn2/3O2 cathode in sodium ion battery

Journal Article · · Journal of Energy Chemistry
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [5]
  1. City Univ. of Hong Kong, Kowloon (Hong Kong)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Nanjing Univ. of Science and Technology (China); City Univ. of Hong Kong, Shenzhen (China). Shenzhen Research Institute
  4. Changsha Univ. of Science and Technology (China)
  5. City Univ. of Hong Kong, Kowloon (Hong Kong); City Univ. of Hong Kong, Shenzhen (China). Shenzhen Research Institute
+ Show Author Affiliations

Iron- and manganese-based layered metal oxides, as cathodes for sodium ion batteries, have received widespread attention because of the low cost and high specific capacity. However, the Jahn-teller effect of Mn3+ ions and the resulted unstable structure usually lead to continuously capacity decay. Herein, Titanium (Ti) has been successfully doped into Na2/3Fe1/3Mn2/3O2 to suppress the Jahn-Teller distortion and improve both cycling and rate performance of sodium ion batteries. In situ high-energy synchrotron X-ray diffraction study shows that Ti-doped compound (Na2/3Fe1/3Mn0.57Ti0.1O2) can maintain the single P2 phase without any phase transition during the whole charging/discharging process. Further, various electrochemical characterizations are also applied to explore the better kinetics of sodium ions transfer in the Na2/3Fe1/3Mn0.57Ti0.1O2. This work provides a comprehensive insight into the Ti-doping effects on the performance from both structural and electrokinetic perspectives.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; Shenzhen Science and Technology Innovation Commission
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1889699
Journal Information:
Journal of Energy Chemistry, Journal Name: Journal of Energy Chemistry Vol. 73; ISSN 2095-4956
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
In situ synchrotron Xray diffraction
Jahn-Teller effect
Layered transition metal oxides
Phase transition