Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 19, Pages 10391-10399Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta00688j
Keywords
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Funding
- National Natural Science Foundation of China [22005082]
- Natural Science Foundation of Hebei Province [B2020202065]
- Hebei Province Education Department Science and Technology Research Project [QN2020209]
- German Research Foundation (DFG) under the joint German-Russian project Acronym KIBSS [448719339]
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The introduction of highly electropositive Sn4+ can solve the issue of Na+/vacancy ordering in layered manganese-based oxide cathodes, improving the migration of sodium ions and reducing strain during cycles. This research provides an effective strategy for designing high-performance cathode materials in rechargeable sodium-ion batteries and beyond.
Layered manganese-based oxide cathodes have attracted extensive attention in sodium-ion batteries (SIBs) due to their low cost and high volumetric energy density. However, Na+/vacancy ordering destabilizes the host structure and retards Na+ diffusion. Herein, we report that this issue can be solved by introducing the highly electropositive Sn4+ to tune charge distribution and then reduce electron delocalization as well as in-plane Na+-Na+ electrostatic repulsions. The disordered Na vacancy arrangement and suppressed P ' 2 <-> P2 phase transition enable P ' 2-Na0.67Mn0.95Sn0.05O2 with fast Na+ migration and ultralow strain (<1%) during cycles. Thus, high reversible capacity of 131.2 mA h g(-1) and coulombic efficiency of 99.77% are achieved at 50 mA g(-1) after 200 cycles. Besides, based on a low reaction energy barrier, the electrode exhibits high Na-storage activity in a wide temperature range of -20 to 70 degrees C. These observations provide an effective strategy for designing high-performance cathode materials in rechargeable SIBs and beyond.
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