首页|The effect of alloy type of lithophilic Cu-Sn interface layer on the deposition/stripping behavior of lithium metal anode
The effect of alloy type of lithophilic Cu-Sn interface layer on the deposition/stripping behavior of lithium metal anode
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NSTL
Elsevier
? 2022 Elsevier B.V.Lithium (Li) metal is one of the best anode candidates for high energy density battery because of the lowest electrode potential and high theoretical capacity. However, the unstable electrode/electrolyte interface will cause uneven Li deposition and induce the formation of Li dendrites. The Cu-Sn alloy interface layer has been proven to be an effective strategy to inhibit the growth of Li dendrites, but how the alloy type of Cu-Sn alloy affects the deposition/exfoliation behavior of Li metal is still unclear. Here, we used a simple and fast chemical plating method to prepared lithophilic Cu3Sn and Cu6Sn5 pure phase interface layers on the surface of the Cu foil by controlling the temperature. Then, the effects of two different alloy types on the deposition/stripping behavior of Li metal anodes were studied. Compared with Cu3Sn@Cu, Cu6Sn5@Cu has a more uniform surface structure and higher surface free energy. Uniform electron distribution and fast reaction kinetics are conducive to the uniform deposition of Li metal. Meanwhile, Cu6Sn5@Cu also has higher electrolyte wettability. This helps to reduce the interphase impedance and polarization, thereby avoiding the growth of Li dendrites. These advantages make deposition mechanism of Li metal on the Cu6Sn5@Cu surface a unidirectional "Parallel-Deposition", while on the Cu3Sn@Cu surface it is a multi-directional "Preferred-Deposition". After being modified by Cu6Sn5, a more reasonable deposition mechanism reduces the overpotential of Li deposition on Cu foil by half. Even under the high deposition capacity of 10 mAh cm?2, Cu6Sn5@Cu can still cycle stably for more than 900 h. In addition, Li-Cu6Sn5@Cu has also been proved to have more stable rate performance and higher capacity retention rate than Li-Cu3Sn@Cu when it is used in full cell with LiFePO4.
Alloy typesCu-Sn alloyDeposition/stripping behavior of LiLi metal anode
Wang Y.、Yang D.、Yang W.、Li X.、Ni Z.、Deng B.、Hou J.、Zhang Y.
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National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science an
NSTL
Elsevier
