Exceptionally Reversible Li-/Na-Ion Storage and Ultrastable Solid- Electrolyte Interphase in Layered GeP5 Anode
- Exceptionally Reversible Li-/Na-Ion Storage and Ultrastable Solid- Electrolyte Interphase in Layered GeP5 Anode
- 조병원; 오시형; 정경윤; Safa Haghighat-Shishavan; Masoud Nazarian-Samani; Mahboobeh Nazarian-Samani; 노하경; Seyed Farshid Kashani-Bozorg; 김광범
- Li-/Na-Ion Storage; Solid- Electrolyte Interphase; GeP5; Anode
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 11, NO 36-32825
- In this study, we synthesize two layered and amorphous structures of germanium phosphide (GeP5) and compare their electrochemical performances to better understand the role of layered, crystalline structures and their ability to control large volume expansions. We compare the results obtained with those of previous, conventional viewpoints addressing the effectiveness of amorphous phases in traditional anodes (Si, Ge, and Sn) to hinder electrode pulverization. By means of both comprehensive experimental characterizations and density functional theory calculations, we demonstrate that layered, crystalline GeP5 in a hybrid structure with multiwalled carbon nanotubes exhibits exceptionally good transport of electrons and electrolyte ions and tolerance to extensive volume changes and provides abundant reaction sites relative to an amorphous structure, resulting in a superior solid-electrolyte interphase layer and unprecedented initial Coulombic efficiencies in both Li-ion and Na-ion batteries. Moreover, the hybrid delivers excellent rate-capability (symmetric and asymmetric) performance and remarkable reversible discharge capacities, even at high current rates, realizing ultradurable cycles in both applications. The findings of this investigation are expected to offer insights into the design and application of layered materials in various devices.
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