Ultrafast Li-ion migration in eggshell-inspired 2D@2D dual porous construction towards high rate energy storage
Date
2020
Authors
Zhu, C.
Hu, D.
Pan, H.
Yuan, H.
Li, Y.
Mao, J.
Guo, Z.
Chen, Z.
Imtiaz, M.
Zhu, S.
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Journal article
Citation
Carbon, 2020; 170:66-74
Statement of Responsibility
Chengling Zhu, Danmei Hu, Hui Pan, Hao Yuan, Yao Li, Jianfeng Mao, Zaiping Guo, Zhixin Chen, Muhammad Imtiaz, Shenmin Zhu
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Abstract
The rate performance of lithium-ion batteries is vital to their practical applications in electronics and vehicles, but impeded by limited migration of Li⁺ and electrons in solid anode materials. Inspired by the double-layer porous structure, a calciferous outer layer elegantly grown on a protein inner layer, of air-penetrable eggshells, a new composite is designed to have a 2D@2D dual porous architecture consisting of 2D holey graphene (hG) and 2D porous ZnFe₂O₄ nanobelts (ZFOnb@hG). In the composite Zn–Fe hybrid Prussian blue analog was transformed into 2D porous ZnFe₂O₄ nanobelts on a holey graphene matrix which acts as both template and substrate. The hG matrix in the dual porous structure can minimize Li⁺/electron transfer pathways and the 2D porous nanobelts consisting of ultrafine ZnFe₂O₄ nanoparticles (3−4 nm) can efficiently buffer the volume change in both lateral and thickness directions during lithiation/delithiation. The resultant composite ZFOnb@hG exhibited an ultrahigh capacity of 1305 mA h g⁻¹ after 250 cycles at 0.2 A g⁻¹ and outstanding rate performance with excellent cycling stability of 703 mA h g⁻¹ retained after 10000 cycles at 10 A g⁻¹. This biomimetic study opens up a new avenue for the development of high-capacity anode materials towards fast-charging capabilities.
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