Mo-Pre-Intercalated MnO2 阴极具有高度稳定的层状结构和用于水系锌离子电池的扩展层间距,ACS Applied Materials & Interfaces

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Mo-Pre-Intercalated MnO2 阴极具有高度稳定的层状结构和用于水系锌离子电池的扩展层间距
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-29 , DOI: 10.1021/acsami.2c15924
Zhen Wang ₁ , Kun Han _{1,

2} , Qi Wan _{3,

4} , Yixing Fang ₁ , Xuanhui Qu ₁ , Ping Li _{1,

4}

Affiliation

虽然锰基氧化物具有高电压和低成本，但反应动力学缓慢和结构稳定性差阻碍了它们在水系可充电锌离子电池（ZIBs）中的应用。在此，提出了钼（Mo）预嵌入策略来解决δ-MnO ₂的上述问题。预嵌入的 Mo 掺杂剂作为层间支柱，不仅可以扩大层间距，还可以增强 δ-MnO ₂的层状结构，最终实现载流子（脱）嵌入过程中增强的反应动力学和出色的循环稳定性。此外，由于 Mo 预嵌入引入的氧缺陷在 Mo 预嵌入 δ-MnO ₂ (Mo-MnO₂）阴极。因此，Mo-MnO ₂正极显示出 451 Wh kg ^–1的高能量密度（基于正极质量）、出色的倍率性能和令人钦佩的长期循环性能，在 1.0 A g 时具有 159 mAhg ^–1的高容量1000 次循环后^{–1 。}此外，非原位实验还揭示了Zn ²⁺ /H ⁺逐步可逆（脱）嵌的储能机制。这项工作为提高 ZIB 的锰基氧化物阴极的电化学性能提供了有见地的指导。

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Mo-Pre-Intercalated MnO2 Cathode with Highly Stable Layered Structure and Expanded Interlayer Spacing for Aqueous Zn-Ion Batteries

Although manganese-based oxides possess high voltage and low cost, the sluggish reaction kinetics and poor structural stability hinder their applications in aqueous rechargeable Zn-ion batteries (ZIBs). Herein, a molybdenum (Mo) pre-intercalation strategy is proposed to solve the above issues of δ-MnO₂. The pre-intercalated Mo dopants, acting as the interlayer pillars, can not only expand the interlayer spacing but also reinforce the layered structure of δ-MnO₂, finally achieving enhanced reaction kinetics and superb cycling stability during carrier (de)intercalation. Moreover, oxygen defects, introduced due to Mo-pre-intercalation, play a critical role in the fast reaction kinetics and capacity improvement of the Mo-pre-intercalated δ-MnO₂ (Mo-MnO₂) cathode. Therefore, the Mo-MnO₂ cathode displays a high energy density of 451 Wh kg^–1 (based on cathode mass), excellent rate capability, and admirable long-term cycling performance with a high capacity of 159 mAhg^–1 at 1.0 A g^–1 after 1000 cycles. In addition, the energy storage mechanism of Zn²⁺/H⁺ stepwise reversible (de)intercalation is also revealed by ex situ experiments. This work provides an insightful guide for boosting the electrochemical performance of Mn-based oxide cathodes for ZIBs.

更新日期：2022-12-29

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