Rechargeable Zn-ion batteries with high power and energy densities: a two-electron reaction pathway in birnessite MnO2 cathode materials†,Journal of Materials Chemistry A

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Rechargeable Zn-ion batteries with high power and energy densities: a two-electron reaction pathway in birnessite MnO2 cathode materials†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-20 , DOI: 10.1039/c9ta11985j
Guanzhou Li _{1,

2,

3,

4,

5} , Zongxiong Huang _{1,

2,

3,

4,

5} , Jinbiao Chen _{1,

2,

3,

4,

5} , Fu Yao _{1,

2,

3,

4,

5} , Jianping Liu _{1,

2,

3,

4,

5} , Oi Lun Li _{6,

7,

8,

9} , Shuhui Sun _{10,

11,

12} , Zhicong Shi _{1,

2,

3,

4,

5}

Affiliation

As one of the most promising next-generation safe and green energy storage technologies, aqueous Zn-ion batteries have attracted considerable attention in recent years. However, their working mechanism is still controversial. Also, their performance needs to be further improved to meet the requirement of widespread applications. Herein, we developed a nanoflower-like MnO₂/C composite with two-electron reaction pathway for use as a cathode material in aqueous Zn-ion batteries. Benefiting from the large specific surface area of the nanoflower-like structure, high conductivity of the carbon materials and the low crystallinity of birnessite-type MnO₂, the Zn-ion battery using MnO₂/C as the cathode material could carry out a deep and fast reaction via the Mn⁴⁺/Mn²⁺ two-electron pathway. At 300 mA g⁻¹, the battery could retain a high specific capacity of 279.7 mA h g⁻¹ after 300 cycles. The second electronic reaction process of Mn³⁺/Mn²⁺ could also work at a high current density. A high initial discharge capacity of more than 200 mA h g⁻¹ was achieved at a high current density of 2000 mA g⁻¹. A two-electron working mechanism of the layered-MnO₂ cathode material is proposed. Due to the advantages of high capacity, high rate performance and good stability, the MnO₂/C composite is a promising cathode material for aqueous Zn-ion batteries, which holds potential for applications in electric vehicles and grid energy storage.

中文翻译：

具有高功率和能量密度的可充电Zn离子电池：水钠锰矿MnO ₂正极材料中的双电子反应路径†

作为最有前途的下一代安全和绿色能源存储技术之一，水性锌离子电池近年来引起了相当大的关注。但是，它们的工作机制仍存在争议。而且，它们的性能需要进一步提高以满足广泛应用的需求。本文中，我们开发了具有两电子反应路径的纳米花状MnO ₂ / C复合材料，用作水性Zn离子电池的正极材料。得益于纳米花状结构的大比表面积，碳材料的高电导率和水钠锰矿型MnO ₂的低结晶度，使用MnO ₂ / C作为正极材料的Zn离子电池可以进行深加工。并通过快速反应Mn ⁴⁺ / Mn ²⁺双电子路径。在300 mA g ^-1下，电池在300次循环后可以保持279.7 mA hg ^-1的高比容量。Mn ³⁺ / Mn ²⁺的第二电子反应过程也可以在高电流密度下工作。在2000 mA g ^-1的高电流密度下实现了超过200 mA hg ^-1的高初始放电容量。提出了层状MnO ₂正极材料的双电子工作机理。由于具有高容量，高倍率性能和良好稳定性的优点，MnO ₂/ C复合材料是用于水性Zn-离子电池的有希望的阴极材料，具有在电动汽车和电网储能中应用的潜力。

更新日期：2020-01-07

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