Realizing Complete Solid-Solution Reaction in High Sodium Content P2-Type Cathode for High-Performance Sodium-Ion Batteries
- 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)
- Univ. of Maryland, College Park, MD (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- 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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