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Title: Defect–Concentration–Mediated T–Nb2O5 Anodes for Durable and Fast–Charging Li–Ion Batteries

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [4];  [2]; ORCiD logo [1]
  1. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Institute of Ceramics; University of Chinese Academy of Sciences, Beijing (China)
  2. University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Institute of Ceramics
  3. Shanghai Jiao Tong Univ. (China)
  4. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Institute of Ceramics

Abstract Metastable orthorhombic niobium pentoxide (T‐Nb 2 O 5 ) is a promising anode to fulfill the requirements for high‐rate Li‐ion batteries (LIBs). Stoichiometric T‐Nb 2 O 5 is plagued by low electric conductivity and particle pulverization after repeated charge/discharge processes. In this work, oxygen vacancies are implanted into T‐Nb 2 O 5 particles via acid immersion of Nb 2 O 5 · n H 2 O with the formation of Lewis acid sites. The multiple characterizations and simulations reveal the lengthening of NbO bonds, and the transformation from NbO 7 pentagonal bipyramids and NbO 6 tetragonal bipyramids in T‐Nb 2 O 5− x . The enrichment of oxygen vacancies endows T‐Nb 2 O 5− x with higher electric conductivity, better electrochemical kinetics, larger pseudocapacitive contribution. O‐doped graphitic C 3 N 4 is creatively proposed as a trace oxygen pump to repair excessive oxygen vacancies, and it also serves as a sacrifice template for Nb 2 O 5− x growth to construct a porous and monolithic electrode network. Defect‐modulated Nb 2 O 5− x displays extraordinary cycling stability (164 mAh g −1 at 5 C after 1100 cycles), high capacity retention (104 mAh g −1 ) at an ultrahigh rate (25 C), and large areal capacity (0.74 mAh cm −2 ) under high mass loading (4 mg cm −2 ). The practical prospect is proved by Nb 2 O 5− x /LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cells with high average platform (2.12 V) and high specific capacity (229 mAh g −1 ). The oxygen‐defect modulation strategy on oxide anodes provides an alternative solution to fast‐charging and durable LIBs.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Shanghai Science and Technology Committee
Grant/Contract Number:
SC0012704; 2016YFB0901600; U1830113; 51772313; 21975276; 20520710800
OSTI ID:
1981338
Alternate ID(s):
OSTI ID: 1833419
Journal Information:
Advanced Functional Materials, Vol. 32, Issue 12; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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