<br>先进的 3D 打印钒酸钾铵/rGO 气凝胶阴极，用于耐用的高容量钾离子电池,Small

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先进的 3D 打印钒酸钾铵/rGO 气凝胶阴极，用于耐用的高容量钾离子电池
Small ( IF 13.0 ) Pub Date : 2024-08-22 , DOI: 10.1002/smll.202405430
Zhixia Duan ₁ , Xiaoling Zhang ₂ , Junmin Xu ₁ , Ningning Chu ₁ , Jinwei Zhang ₁ , Mengfan Ji ₁ , Xinchang Wang ₁ , Dezhi Kong ₁ , Ye Wang ₁ , Paul K Chu ₂

Affiliation

3D 打印的富氧空位钒酸钾/还原氧化石墨烯（KNVO_v/rGO）微晶格气凝胶专为高性能 K 离子电池（KIB）中的阴极而设计。3D 打印的 KNVO_v/rGO 电极具有周期性的亚毫米微通道和互连的打印细丝，由高度分散的 KNVO_v 纳米带、褶皱的石墨烯纳米片和丰富的微孔组成。rGO 主链的明确 3D 多孔微晶结构不仅提供了互连的导电 3D 网络和所需的机械稳健性，还促进了液体电解质渗透到内部活性位点，从而确保了 KNVO_v 纳米带内 K 离子插层/脱嵌的稳定电化学环境。3D 打印的 KNVO_v/rGO 微晶格气凝胶电极具有 109.3 mAh ^g-1 的高放电容量，在 50 mA ^g-1 下循环 200 次后容量保持率为 92.6%，在 500 mA ^g-1 下循环 2000 次后保持 75.8 mAh ^g-1 的放电容量-1。由 3D 打印的 KNVO_v/rGO 组成的柔性袋型 KIB 电池具有良好的机械耐久性，并在弯曲和折叠等不同形式的变形下保持高比容量。这些结果为将先进的 3D 打印电极材料集成到 K 离子电池以及柔性和可穿戴储能设备的设计提供了有价值的见解。

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Advanced 3D-Printed Potassium Ammonium Vanadate/rGO Aerogel Cathodes for Durable and High-Capacity Potassium-Ion Batteries

A 3D-printed oxygen-vacancy-rich potassium ammonium vanadate/reduced graphene oxide (KNVO_v/rGO) microlattice aerogel is designed for the cathode in high-performance K-ion batteries (KIBs). The 3D-printed KNVO_v/rGO electrode with periodic submillimeter microchannels and interconnected printed filaments is composed of highly dispersed KNVO_v nanobelts, wrinkled graphene nanoflakes, and abundant micropores. The well-defined 3D porous microlattice structure of the rGO backbone not only provides the interconnected conductive 3D network and the required mechanical robustness but also facilitates the penetration of the liquid electrolyte into inner active sites, consequently ensuring a stable electrochemical environment for K-ion intercalation/deintercalation within the KNVO_v nanobelts. The 3D-printed KNVO_v/rGO microlattice aerogel electrode has a high discharge capacity of 109.3 mAh g⁻¹ with a capacity retention rate of 92.6% after 200 cycles at 50 mA g⁻¹ and maintains a discharge capacity of 75.8 mAh g⁻¹ after 2000 cycles at 500 mA g⁻¹. The flexible pouch-type KIB battery consisting of the 3D-printed KNVO_v/rGO has good mechanical durability and retains a high specific capacity under different forms of deformation such as bending and folding. The results provide valuable insights into the integration of advanced 3D-printed electrode materials into K-ion batteries and the design of flexible and wearable energy storage devices.

更新日期：2024-08-22

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