Carbon coated 3D Nb2O5 hollow nanospheres with superior performance as an anode for high energy Li-ion capacitors,Sustainable Energy & Fuels

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Carbon coated 3D Nb2O5 hollow nanospheres with superior performance as an anode for high energy Li-ion capacitors
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-07-24 , DOI: 10.1039/d0se00804d
Haoran Li _{1,

2,

3,

4} , Dong Li _{1,

2,

3,

4} , Jing Shi _{1,

2,

3,

4} , Zeyin He _{1,

2,

3,

4} , Zongchen Zhao _{1,

2,

3,

4} , Huanlei Wang _{1,

2,

3,

4}

Affiliation

Li-ion capacitors (LICs) are assembled from a lithium-ion battery (LIB)-type anode and a capacitor-type cathode, but their power density is limited by the battery anode. Looking for high electrochemical performance anode materials is an available approach to improve the properties of LICs. Herein, we report a porous Nb₂O₅@C hollow nanosphere composite material (3D Nb₂O₅@C), in which the hollow structure plays a role in buffering the volume expansion during the Li⁺ insertion and the outer carbon layer enhances the electrical conductivity. In a lithium half-cell, the composite electrode delivers a high capacity of about 134 mA h g⁻¹ at 0.1 A g⁻¹ and exhibits a capacity retention of 72% after 500 cycles. A lithium-ion capacitor fabricated with 3D Nb₂O₅@C as the anode displays a high energy density of 96.8 W h kg⁻¹ and a high power density of 41 kW kg⁻¹. Moreover, the capacity retention of the LIC is 75% at 2 A g⁻¹ after 3000 cycles. This work shows that 3D Nb₂O₅@C has the potential to be a superior electrode material in energy storage devices.

中文翻译：

碳涂层3D Nb2O5空心纳米球具有出色的性能，可作为高能锂离子电容器的阳极

锂离子电容器（LICs）由锂离子电池（LIB）型阳极和电容器型阴极组装而成，但是它们的功率密度受到电池阳极的限制。寻找高电化学性能的阳极材料是提高LICs性能的一种可行方法。本文中，我们报道了一种多孔的Nb ₂ O ₅ @C中空纳米球复合材料（3D Nb ₂ O ₅ @C），其中中空结构在缓冲Li ⁺插入过程中起到缓冲体积膨胀的作用，并且外部碳层增强电导率。在锂半电池中，复合电极在0.1 A g ^-1时可提供约134 mA hg ^-1的高容量500次循环后，容量保持率达到72％。以3D Nb ₂ O ₅ @C作为阳极制造的锂离子电容器显示出96.8 W h kg ^-1的高能量密度和41 kW kg ^-1的高功率密度。此外，在3000次循环后，LIC在2 A g ^-1下的容量保持率为75％。这项工作表明3D Nb ₂ O ₅ @C有潜力成为能量存储设备中的优质电极材料。

更新日期：2020-08-25

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