Self-assembled Ti3C2 MXene and N-rich porous carbon hybrids as superior anodes for high-performance potassium-ion batteries,Energy & Environmental Science

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Self-assembled Ti3C2 MXene and N-rich porous carbon hybrids as superior anodes for high-performance potassium-ion batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019-11-20 , DOI: 10.1039/c9ee03250a
Ruizheng Zhao _{1,

2,

3,

4,

5} , Haoxiang Di _{1,

2,

3,

4,

5} , Xiaobin Hui _{1,

2,

3,

4,

5} , Danyang Zhao _{1,

2,

3,

4,

5} , Rutao Wang _{1,

2,

3,

4,

5} , Chengxiang Wang _{1,

2,

3,

4,

5} , Longwei Yin _{1,

2,

3,

4,

5}

Affiliation

Potassium-ion batteries (PIBs) are attracting increased attention because of their low cost and similar energy storage mechanism to lithium-ion batteries. Considering the low structural stability and poor electrochemical redox reaction kinetics resulting from the large size of K⁺ (1.38 Å), we elaborately designed novel PDDA-NPCN/Ti₃C₂ hybrids as PIBs anodes via an electrostatic attraction self-assembly approach, while N-rich porous carbon nanosheets (NPCNs) are derived from metal–hexamine frameworks. The coupled PDDA-NPCN/Ti₃C₂ hybrids with stacked structure and large specific surface area could ensure intimate contact between Ti₃C₂ and the NPCNs to efficiently take advantage of both components and more accessible active sites. The hybrids afford enlarged interlayer spacing and unique 3D interconnected conductive networks to accelerate the ionic/electronic transport rates. Meanwhile, the robust hybrids contribute high chemical stabilities due to favorable tolerance to volume change caused by phase transformations during the fast charge/discharge process. DFT calculations further indicate that the PDDA-NPCN/Ti₃C₂ hybrids efficiently reduce the adsorption energy of K⁺ and accelerate the reaction kinetics. The hybrids possess a remarkable synergetic effect, leading to a high reversible capacity of 358.4 mA h g⁻¹ after 300 cycles at 0.1 A g⁻¹ and long cycling stability of 252.2 mA h g⁻¹ with only 0.03% degradation per cycle within 2000 cycles at 1.0 A g⁻¹. This work paves the way for further self-assembled coupled hybrids in energy storage devices.

中文翻译：

自组装的Ti3C2 MXene和富氮多孔碳杂化物可作为高性能钾离子电池的优质阳极

钾离子电池（PIB）由于其低成本和与锂离子电池类似的储能机制而受到越来越多的关注。考虑到K ⁺（1.38Å）的大尺寸导致结构稳定性低和电化学氧化还原反应动力学差，我们通过静电吸引自组装方法精心设计了新颖的PDDA-NPCN / Ti ₃ C ₂杂化体作为PIB阳极，而富氮多孔碳纳米片（NPCN）源自金属-六胺骨架。具有堆叠结构和大比表面积的PDDA-NPCN / Ti ₃ C ₂偶联杂化物可以确保Ti ₃ C ₂之间的紧密接触NPCN可以有效利用组件和更易访问的活动站点。混合材料提供了更大的层间间距和独特的3D互连导电网络，可加快离子/电子传输速率。同时，由于对快速充电/放电过程中由相变引起的体积变化具有良好的耐受性，因此坚固的混合动力车具有较高的化学稳定性。DFT计算进一步表明，PDDA-NPCN / Ti ₃ C ₂杂化物有效降低了K ⁺的吸附能并加快了反应动力学。杂种具有显着的协同效应，在0.1 A g ^-1下经过300次循环后可产生358.4 mA hg ^-1的高可逆容量和252.2 mA hg ^-1的长循环稳定性，在1.0 A g ^-1的2000个循环中，每个循环仅降解0.03％。这项工作为在储能设备中进一步自组装耦合混合动力车铺平了道路。

更新日期：2019-11-20

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