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Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery
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Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery
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Journal Article
Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery
2021
Overview
Layered transition-metal oxides have attracted intensive interest for cathode materials of sodium-ion batteries. However, they are hindered by the limited capacity and inferior phase transition due to the gliding of transition-metal layers upon Na
+
extraction and insertion in the cathode materials. Here, we report that the large-sized K
+
is riveted in the prismatic Na
+
sites of P2-Na
0.612
K
0.056
MnO
2
to enable more thermodynamically favorable Na
+
vacancies. The Mn-O bonds are reinforced to reduce phase transition during charge and discharge. 0.901 Na
+
per formula are reversibly extracted and inserted, in which only the two-phase transition of P2 ↔ P’2 occurs at low voltages. It exhibits the highest specific capacity of 240.5 mAh g
−1
and energy density of 654 Wh kg
−1
based on the redox of Mn
3+
/Mn
4+
, and a capacity retention of 98.2% after 100 cycles. This investigation will shed lights on the tuneable chemical environments of transition-metal oxides for advanced cathode materials and promote the development of sodium-ion batteries.
High-capacity and structural stable cathode materials are challenges for sodium-ion batteries. Here, the authors report a layered P2-Na
0.612
K
0.056
MnO
2
with large-sized K
+
riveted in the Na-layers to enable 0.9 Na
+
(de)insertion with a reversible phase transition of P2-P’2.
Publisher
Springer Science and Business Media LLC,Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
