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首页> 外文期刊>Advanced functional materials >Activating Oxygen Redox in Layered Na_xMnO_2 to Suppress Intrinsic Deficient Behavior and Enable Phase-Transition-Free Sodium Ion Cathode
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Activating Oxygen Redox in Layered Na_xMnO_2 to Suppress Intrinsic Deficient Behavior and Enable Phase-Transition-Free Sodium Ion Cathode

机译：Activating Oxygen Redox in Layered Na_xMnO_2 to Suppress Intrinsic Deficient Behavior and Enable Phase-Transition-Free Sodium Ion Cathode

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摘要

P2-type layered Na_xMnO_2 cathode shows great potential in practicalsodium ion batteries, especially for grid-level applications due to its ecofriendlyand cost-effective sodium and manganese resources, and hightheoretical specific capacity. However, several obstacles including severephase transitions of P2-O2 and P2-P2′, low redox potential of Mn~(3+)/Mn~(4+),disproportionation reaction and Jahn-Teller distortion of Mn~(3+), and deficientbehavior have already hindered its practical applications. Herein, aLi, Cu co-doping strategy to tackle the mentioned obstacles by activatingthe oxygen redox is presented. The Li, Cu co-doped material exhibits solidsolution reaction without any phase transitions as proved by in situ X-raydiffraction measurement and reduces the dissolution of active manganeseelement. With this modification treatment, it can dramatically raise thecycling stability from 30.4 to 80.1 after 150 cycles and simultaneouslyimproves the deficient behavior due to the capacity contribution of oxygenredox at high voltage. More importantly, the coin-cell type sodium ionfull cell assembled with this cathode and commercial hard carbon anodedelivers a promising energy density of 225.1 Wh kg~(–1).

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