Suppressed the High-Voltage Phase Transition of P2-Type Oxide Cathode for High-Performance Sodium-Ion Batteries
Suppressed the High-Voltage Phase Transition of P2-Type Oxide Cathode for High-Performance Sodium-Ion Batteries
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抑制高性能钠离子电池P2型氧化物阴极的高压相变
DOI：
10.1021/acsami.9b03326
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发表时间：
2019-04-24
影响因子：
9.5
通讯作者：
Zhou, Haoshen
中科院分区：
文献类型：
--
作者：
Jiang, Kezhu;Zhang, Xueping;Zhou, Haoshen
利用资源丰富的锰基材料作为正极的钠离子电池(SIB)被认为是大规模储能应用的潜在候选者。然而，典型的P2型锰基层状氧化物正极在高电压下不可避免地会发生相变，在钠离子的嵌入和脱嵌过程中，往往存在比容量有限和循环寿命较差的问题。因此，我们开发了一种具有高可逆容量和循环寿命的Ru取代P2-Na0.6MnO2作为钠载体。多项表征研究表明，Ru取代可以改善P2-OP4的电子和离子电导，特别是抑制P2-OP4的相变，导致单相反应区域的扩展。Ru的替代不仅提高了比容量(209.3 mA h g(-1))，而且还改善了倍率性能(类似于50℃下的100 mA h g(-1))和循环稳定性。这项工作为设计和制备高容量、高稳定性的锰基阴极开辟了一条新的途径。
Sodium-ion batteries (SIBs), using the resourceful Mn-based materials as cathodes, have been considered as promising candidates for large-scale energy-storage applications. However, the representative P2-type Mn-based layered oxide cathode usually suffers from a limited specific capacity and a poor cycle life in Na-ion intercalation and deintercalation processes because of the unavoidable phase transition at a high voltage. Herein, we developed Ru-substituted P2-Na0.6MnO2 as a promising sodium host with a high reversible capacity and cycle life. The multiple characterization investigations reveal that Ru substitution could improve the electronic and ionic conductions and particularly suppress the phase transition of P2-OP4, resulting in the extension of the single-phase reaction region. Ru substitution not only enhances the specific capacity (209.3 mA h g(-1)) but also improves the rate capability (similar to 100 mA h g(-1) at 50 C) and cycling stability. This work may open a new avenue for designing and fabricating SIBs by using Mn-based cathodes with high capacity and stability.