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Realizing Complete Solid-Solution Reaction in High Sodium Content P2-Type Cathode for High-Performance Sodium-Ion Batteries

Journal Article · · Angewandte Chemie
 [1];  [2];  [3];  [4];  [2];  [2];  [4];  [3];  [4];  [2]
  1. Nankai Univ. Tianjin (China) Key Lab. of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast); Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Nankai Univ. Tianjin (China) Key Lab. of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast)
P2-type layered oxides suffer from an ordered Na+/vacancy arrangement and P2→O2/OP4 phase transitions, leading them to exhibit multiple voltage plateaus upon Na+ extraction/insertion. The deficient sodium in the P2-type cathode easily induces the bad structural stability at deep desodiation states and limited reversible capacity during Na+ de/insertion. These drawbacks cause poor rate capability and fast capacity decay in most P2-type layered oxides. In this work, to address these challenges, a novel high sodium content (0.85) and plateau-free P2-type cathode-Na0.85Li0.12Ni0.22Mn0.66O2 (P2-NLNMO) was developed. The complete solid-solution reaction over a wide voltage range ensures both fast Na+ mobility (10-11 to 10-10cm2s-1) and small volume variation (1.7%). Furthermore, the high sodium content P2-NLNMO exhibits a higher reversible capacity of 123.4 mAhg-1, superior rate capability of 79.3 mAhg-1 at 20 C, and 85.4% capacity retention after 500 cycles at 5 C. The sufficient Na and complete solid-solution reaction are critical to realizing high-performance P2-type cathodes for sodium-ion batteries.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
111 Project; Ministry of Science and Technology of China; National Natural Science Foundation of China; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
SC0012704
OSTI ID:
1644017
Report Number(s):
BNL-216215-2020-JAAM
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 34 Vol. 132; ISSN 0044-8249
Publisher:
German Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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