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| Three-dimensional porous collector based on Cu-Li6.4La3Zr1.4Ta0.6O12 composite layer for the construction of stable lithium metal anode |
| Author Name | Affiliation | E-mail | | TONG Zhiyuan | Aero Engine Research Center, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China | | | LI Ziyuan | Aero Engine Research Center, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China | | | ZHANG Ke | Aero Engine Research Center, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China | zhangke2019@mail.tsinghua.edu.cn |
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| Abstract: Here, we have prepared a kind of anode current collector based on Li6.4La3Zr1.4Ta0.6O12 (LLZTO) solid electrolyte and copper composite layer with 3D porous structure by phase transformation co banding casting method, and the addition of LLZTO provides abundant ion transport channels and nucleation sites for lithium ions, while the copper with 3D porous structure provides enlarged specific surface area and can accommodate a large amount of dead lithium and other by-products generated in electrochemical process, and at the same time, the phasetransformation co-banding casting method is easy to operate and suitable for anode interface impedance increase. The prepared Cu-LLZTO@Li symmetric cell achieved a long cycle life of 280 h at a current density of 4 mA·cm-2 with an ultra-low voltage hysteresis of 25 mV, which was 4 times and 3 times higher than that of Cu foil and 3D-Cu, respectively. Thanks to the constructed stable solid electrolyte interphase (SEI) film and no lithium dendrite generation, the Cu-LLZTO@Li symmetric cell exhibited the lowest ohmic resistance (2.749 Ω·cm-2) and interface resistance (0.544 Ω·cm-2) compared to Cu foil@Li and 3D-Cu@Li. In the half-cell, Cu-LLZTO did not produce a soft short circuit and maintained 98.4% Coulombic efficiency over 70 cycles, and the charging and discharging voltage plateau was consistently maintained at a low level of 0.15 V during the cycle. |
| Keywords: composite collector lithium anode solid-state electrolyte interfacial contact lithium metal battery |
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| TONG Zhiyuan,LI Ziyuan,ZHANG Ke.Three-dimensional porous collector based on Cu-Li6.4La3Zr1.4Ta0.6O12 composite layer for the construction of stable lithium metal anode[J].Chinese Journal of Inorganic Chemistry,2025,41(3):499-508. |
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