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High-capacity K+-pillared layered manganese dioxide as cathode material for high-rate aqueous zinc-ion battery.

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Title: High-capacity K+-pillared layered manganese dioxide as cathode material for high-rate aqueous zinc-ion battery.
Authors: Song, Ailing1,2 (AUTHOR), Zhao, Jinghao1 (AUTHOR), Qiao, Chunting1 (AUTHOR), Ding, Yali1 (AUTHOR), Tian, Guoxing1 (AUTHOR), Fan, Yuqian1 (AUTHOR), Ma, Zhipeng1,2 (AUTHOR) mazp@ysu.edu.cn, Dai, Lei1,3 (AUTHOR) dailei@ncst.edu.cn, Shao, Guangjie1,2 (AUTHOR) shaoguangjie@ysu.edu.cn, Liu, Zhaoping1,4 (AUTHOR) liuzp@nimte.ac.cn
Source: Journal of Colloid & Interface Science. Nov2024, Vol. 674, p336-344. 9p.
Subjects: Manganese dioxide, Energy storage, Potential energy, Electron transport, Structural dynamics
Abstract: [Display omitted] Sluggish kinetics and severe structural instability of manganese-based cathode materials for rechargeable aqueous zinc-ion batteries (ZIBs) lead to low-rate capacity and poor cyclability, which hinder their practical applications. Pillaring manganese dioxide (MnO 2) by pre-intercalation is an effective strategy to solve the above problems. However, increasing the pre-intercalation content to realize stable cycling of high capacity at large current densities is still challenging. Here, high-rate aqueous Zn2+ storage is realized by a high-capacity K+-pillared multi-nanochannel MnO 2 cathode with 1 K per 4 Mn (δ-K 0.25 MnO 2). The high content of the K+ pillar, in conjunction with the three-dimensional confinement effect and size effect, promotes the stability and electron transport of multi-nanochannel layered MnO 2 in the ion insertion/removal process during cycling, accelerating and accommodating more Zn2+ diffusion. Multi-perspective in/ex-situ characterizations conclude that the energy storage mechanism is the Zn2+/H+ ions co-intercalating and phase transformation process. More specifically, the δ-K 0.25 MnO 2 nanospheres cathode delivers an ultrahigh reversible capacity of 297 mAh g−1 at 1 A g−1 for 500 cycles, showing over 96 % utilization of the theoretical capacity of δ-MnO 2. Even at 3 A g−1, it also delivered a 63 % utilization and 64 % capacity retention after 1000 cycles. This study introduces a highly efficient cathode material based on manganese oxide and a comprehensive analysis of its structural dynamics. These findings have the potential to improve energy storage capabilities in ZIBs significantly. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] Sluggish kinetics and severe structural instability of manganese-based cathode materials for rechargeable aqueous zinc-ion batteries (ZIBs) lead to low-rate capacity and poor cyclability, which hinder their practical applications. Pillaring manganese dioxide (MnO 2) by pre-intercalation is an effective strategy to solve the above problems. However, increasing the pre-intercalation content to realize stable cycling of high capacity at large current densities is still challenging. Here, high-rate aqueous Zn2+ storage is realized by a high-capacity K+-pillared multi-nanochannel MnO 2 cathode with 1 K per 4 Mn (δ-K 0.25 MnO 2). The high content of the K+ pillar, in conjunction with the three-dimensional confinement effect and size effect, promotes the stability and electron transport of multi-nanochannel layered MnO 2 in the ion insertion/removal process during cycling, accelerating and accommodating more Zn2+ diffusion. Multi-perspective in/ex-situ characterizations conclude that the energy storage mechanism is the Zn2+/H+ ions co-intercalating and phase transformation process. More specifically, the δ-K 0.25 MnO 2 nanospheres cathode delivers an ultrahigh reversible capacity of 297 mAh g−1 at 1 A g−1 for 500 cycles, showing over 96 % utilization of the theoretical capacity of δ-MnO 2. Even at 3 A g−1, it also delivered a 63 % utilization and 64 % capacity retention after 1000 cycles. This study introduces a highly efficient cathode material based on manganese oxide and a comprehensive analysis of its structural dynamics. These findings have the potential to improve energy storage capabilities in ZIBs significantly. [ABSTRACT FROM AUTHOR]
ISSN:00219797
DOI:10.1016/j.jcis.2024.06.170