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Improving Na/Na3Zr2Si2PO12 Interface via SnOx/Sn Film for High-Performance Solid-State Sodium Metal Batteries
Small Methods ( IF 10.7 ) Pub Date : 2021-08-01 , DOI: 10.1002/smtd.202100339 Jiayi Yang 1 , Henghui Xu 1 , Jingyi Wu 1 , Zhonghui Gao 2 , Fei Hu 1 , Ying Wei 1 , Yuyu Li 3 , Dezhong Liu 1 , Zhen Li 1 , Yunhui Huang 1
Small Methods ( IF 10.7 ) Pub Date : 2021-08-01 , DOI: 10.1002/smtd.202100339 Jiayi Yang 1 , Henghui Xu 1 , Jingyi Wu 1 , Zhonghui Gao 2 , Fei Hu 1 , Ying Wei 1 , Yuyu Li 3 , Dezhong Liu 1 , Zhen Li 1 , Yunhui Huang 1
Affiliation
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Sodium (Na) metal batteries have attracted much attention due to their rich resources, low cost, and high energy density. As a promising solid electrolyte, Na3Zr2Si2PO12 (NZSP) is expected to be used in solid-state Na metal batteries addressing the safety concerns. However, due to the poor contact between NZSP and the Na metal, the interfacial resistance is too large to gain proper performance for practical solid-state batteries (SSBs) application. Here, a SnOx/Sn film is successfully introduced to improve the interface between Na and NZSP for enhancing the electrochemical performance of SSBs. As a result, the Na/NZSP interfacial resistance is dramatically reduced from 581 to 3 Ω cm2. The modified Na||Na symmetric cell keeps cycling over 1500 h with an overpotential of 40 mV at 0.1 mA cm–2 at room temperature. Even at current densities of 0.3 and 0.5 mA cm–2, the cell still maintains an excellent cyclability. When coupled with NaTi2(PO4)3 and a Na3V2(PO4)3 cathode, the full-cell demonstrates a good performance at 0.2 C and 1 C, respectively. The present work provides an effective way to solve the interface issue of SSBs.
中文翻译：
通过用于高性能固态钠金属电池的 SnOx/Sn 薄膜改善 Na/Na3Zr2Si2PO12 界面
钠（Na）金属电池因其资源丰富、成本低、能量密度高而备受关注。作为一种很有前途的固体电解质，Na 3 Zr 2 Si 2 PO 12 (NZSP) 有望用于解决安全问题的固态钠金属电池。然而，由于 NZSP 与 Na 金属之间的接触不良，界面电阻太大而无法获得实际固态电池 (SSB) 应用的适当性能。在这里，成功地引入了 SnO x /Sn 薄膜来改善 Na 和 NZSP 之间的界面，从而提高 SSB 的电化学性能。结果，Na/NZSP 界面电阻从 581 显着降低到 3 Ω cm 2. 改进的 Na||Na 对称电池在室温下以 40 mV 的过电位在 0.1 mA cm –2下保持循环超过 1500 小时。即使在 0.3 和 0.5 mA cm –2 的电流密度下，电池仍保持出色的循环性能。当与 NaTi 2 (PO 4 ) 3和 Na 3 V 2 (PO 4 ) 3阴极结合时，全电池分别在 0.2 C 和 1 C 下表现出良好的性能。目前的工作为解决 SSB 的接口问题提供了一种有效的方法。
更新日期：2021-09-14
中文翻译：
通过用于高性能固态钠金属电池的 SnOx/Sn 薄膜改善 Na/Na3Zr2Si2PO12 界面
钠（Na）金属电池因其资源丰富、成本低、能量密度高而备受关注。作为一种很有前途的固体电解质，Na 3 Zr 2 Si 2 PO 12 (NZSP) 有望用于解决安全问题的固态钠金属电池。然而，由于 NZSP 与 Na 金属之间的接触不良，界面电阻太大而无法获得实际固态电池 (SSB) 应用的适当性能。在这里，成功地引入了 SnO x /Sn 薄膜来改善 Na 和 NZSP 之间的界面，从而提高 SSB 的电化学性能。结果，Na/NZSP 界面电阻从 581 显着降低到 3 Ω cm 2. 改进的 Na||Na 对称电池在室温下以 40 mV 的过电位在 0.1 mA cm –2下保持循环超过 1500 小时。即使在 0.3 和 0.5 mA cm –2 的电流密度下，电池仍保持出色的循环性能。当与 NaTi 2 (PO 4 ) 3和 Na 3 V 2 (PO 4 ) 3阴极结合时，全电池分别在 0.2 C 和 1 C 下表现出良好的性能。目前的工作为解决 SSB 的接口问题提供了一种有效的方法。
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