2D VOPO4 Pseudocapacitive Ultrafast-Charging Cathode with Multi-Electron Chemistry for High-Energy and High-Power Solid-State Lithium Metal Batteries,Advanced Energy Materials

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2D VOPO4 Pseudocapacitive Ultrafast-Charging Cathode with Multi-Electron Chemistry for High-Energy and High-Power Solid-State Lithium Metal Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-04-09 , DOI: 10.1002/aenm.202204015
Feifei Xing _{1,

2} , Feng Su _{1,

2} , Jieqiong Qin ₃ , Pengchao Wen ₁ , Yuejiao Li _{1,

2} , Liangzhu Zhang ₁ , Jiaxin Ma _{1,

2} , Shuanghao Zheng _{1,

4} , Xin Guo _{1,

4} , Zhong‐Shuai Wu _{1,

4}

Affiliation

Lithium metal batteries (LMBs) are acknowledged to be one major direction for next-generation energy storage devices. However, the practical applications of LMBs are certainly limited by the low power density and safety issues owing to the lack of high-capacity pseudocapacitive cathode materials and solid electrolytes. Herein, the rational synthesis of 2D VOPO₄ nanosheets with enriched V⁴⁺ defects (VOPO₄@G-Air) enabling ultrafast multi-electron reactions as a high-capacity pseudocapacitive cathode is reported. Through V⁴⁺ defect engineering, the larger polarizationand inhomogeneous multi-electron reactions are vastly improved, resulting in remarkably fast kinetics. Benefiting from the ultrathin 2D structure and controllably regulated V⁴⁺ defect concentration, a high discharge capacity of 313 mA h g⁻¹at 0.1C is achieved, anda large capacity of 116 mA h g⁻¹ is offered at 50C. Finally, utilizing the as-synthesized VOPO₄@G-Air and a solid-state electrolyte based on ethoxylated trimethylolpropane triacrylate (ETPTA-LiClO₄-SSE) , the assembled solid-state LMBs (Li||ETPTA-LiClO₄-SSE||VOPO₄) show high energy density of 85.4 Wh kg⁻¹ at 114.5 W kg⁻¹ and high power density of 2.3 kW kg⁻¹ at 45.86 Wh kg⁻¹. Further, the pouch cell unveils extraordinary safety and excellent flexibility. This work provides new insights in the construction of ultrafast and high-capacity pseudocapacitive cathodes with multi-electron reactions for solid-state LMBs.

中文翻译：

用于高能大功率固态锂金属电池的多电子化学二维 VOPO4 赝电容超快充电阴极

锂金属电池（LMBs）被公认为是下一代储能设备的主要方向之一。然而，由于缺乏高容量赝电容性正极材料和固体电解质，LMBs 的实际应用受到低功率密度和安全问题的限制。在此，报道了具有富集 V ^{4+缺陷的二维 VOPO}₄纳米片(VOPO ₄ @G-Air)的合理合成，可作为高容量赝电容性阴极实现超快多电子反应。通过V ⁴⁺缺陷工程，更大的极化和不均匀的多电子反应得到了极大的改善，从而导致非常快的动力学。得益于超薄二维结构和可控调节的V ⁴⁺缺陷浓度，在0.1C时实现了313 mA hg ^-1的高放电容量，在50C时提供了116 mA hg ^{-1的大容量。}最后，利用合成后的 VOPO _{4 @G-Air 和基于乙氧基化三羟甲基丙烷三丙烯酸酯 (ETPTA-LiClO}₄ -SSE)的固态电解质，组装固态 LMBs (Li||ETPTA-LiClO ₄ -SSE| |VOPO ₄ )在 114.5 W kg 时显示出 85.4 Wh kg ⁻¹的高能量密度^-1和 2.3 kW kg ^-1的高功率密度在 45.86 Wh kg ^-1。此外，软包电池还具有非凡的安全性和出色的灵活性。这项工作为固态 LMB 的多电子反应超快和高容量赝电容阴极的构建提供了新的见解。

更新日期：2023-04-09

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