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首页> 外文期刊>Advanced energy materials >Selective Anionic Redox and Suppressed Structural Disordering Enabling High-Energy and Long-Life Li-Rich Layered-Oxide Cathode
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Selective Anionic Redox and Suppressed Structural Disordering Enabling High-Energy and Long-Life Li-Rich Layered-Oxide Cathode

机译：选择性阴离子氧化还原和抑制结构排放，使高能和长寿命富锂层状氧化物阴极

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摘要

Despite their high energy densities, Li-rich layered oxides suffer from low capacity retention and continuous voltage decay caused by the migration of transition-metal cations into the Li layers. The cation migration stabilizes oxidized oxygen anions through the decoordination of oxygen from the metal once the anions participate in the redox reaction. Structural disordering is thus considered inevitable in most Li-rich layered oxides. However, herein, a Mg-substituted Li-rich layered oxide, Li1.2Mg0.2Ru0.6O2, with high structural and electrochemical stability is presented. Although using both cationic and anionic redox reactions, Ru migration in Li1.2-xMg0.2Ru0.6O2 is thermodynamically unfavored as a result of selectively oxidized O ions, suppressed structural disordering, and the formation of short (1.75 angstrom) Ru=O bonds enabled within the layered framework, which effectively decoordinate the oxidized O ions. The unprecedentedly high structural stability of Li1.2Mg0.2Ru0.6O2 leads to not only a high energy density of 964 Wh kg(-1) but also outstanding rate capability and cycle performance. These findings demonstrate the potential of this practical strategy for the stabilization of Li-rich layered oxides even with prolonged cycling.
机译：尽管它们的高能量密度高，但富含量的层状氧化物患有低容量保持和由过渡金属阳离子迁移到LI层引起的连续电压衰减。阳离子迁移稳定通过从金属中的氧气的氧化氧化氧化氧阴离子，一旦阴离子参与氧化还原反应。因此，在大多数含量富含富锂的层状氧化物中认为结构性失调是不可避免的。然而，本文，提出了一种具有高结构和电化学稳定性的Mg-取代的富含量的锂层状氧化物Li1.2mg0.2Ru0.6O2。虽然使用阳离子和阴离子氧化还原反应，但由于选择性氧化O离子，抑制了结构性排放和短（1.75埃）Ru = O键的结果，ru1.2-XMG0.2RU0.6O2中的Ru1.2-XMG0.2RU0.6O2在热力学上不合适在分层框架内启用，有效地向氧化的O离子进行了脱节。 Li1.2mg0.2RU0.6O2的前所未有的高结构稳定性导致高能量密度为964WHKG（-1），而且具有出色的速率能力和循环性能。这些发现表明了这种实际策略的潜力，即使延长循环，也能稳定富含含量的层状氧化物。

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