Three-Dimensional Ordered Macro/Mesoporous Cu/Zn as a Lithiophilic Current Collector for Dendrite-Free Lithium Metal Anode
Three-Dimensional Ordered Macro/Mesoporous Cu/Zn as a Lithiophilic Current Collector for Dendrite-Free Lithium Metal Anode
复制标题
三维有序宏观/介孔铜/锌作为无枝晶锂金属负极的亲锂集流体
DOI：
10.1021/acsami.0c09503
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发表时间：
2020
影响因子：
9.5
通讯作者：
Tang Yiping
中科院分区：
文献类型：
--
作者：
Zhang Duo;Dai Alvin;Fan Binfeng;Li Yingen;Shen Kang;Xiao Teng;Hou Guangya;Cao Huazhen;Tao XinYong;Tang Yiping
锂树枝晶被认为是导致锂金属电池(LMB)性能退化和不可避免短路的主要原因。尽管当代的战略已经显示出解决树枝晶生长的潜力，但没有一个战略实现了完全消除。本文采用简单胶体晶体模板和电化学方法(电沉积和脉冲电镀)相结合的方法，制备了无枝晶、三维有序、大/介孔的铜/锌集电体。与分级结构的中孔(20-50 nm)和大孔(450 Nm)阳极相结合，这种新型集电器在0.2 mA cm(-2)的电流密度下实现了超过2000h的稳定充放电循环和较小的电镀/剥离电位(约8 mV)。400次循环后，库仑效率(CE)也达到94.7%。这种三维、有序的宏介孔结构提供了更大的比表面积，降低了局部电流密度，并包含作为首选Li成核位的亲锂锌涂层。通过这些因素的结合，实现了LMBs中无枝晶Li的沉积和优异的电化学性能的改善。
Li dendrites are considered as the primary cause for degradation and inevitable short circuit in lithium-metal batteries (LMBs). Although contemporary strategies have shown potential for addressing dendrite growth, none have achieved complete elimination. In this paper, a dendrite-free, three-dimensional, ordered, macro/mesoporous Cu/Zn current collector was prepared using a combination of simple colloidal crystal template and electrochemical method (electrodeposition and pulse plating). When paired with a hierarchically structured mesoporous (20-50 nm) and macroporous (450 nm) anode, this novel current collector achieved stable charge/discharge cycles of over 2000 h and a small plating/stripping potential (approximate to 8 mV) at a current density of 0.2 mA cm(-2). Coulombic efficiencies (CE) also reached 94.7% after 400 cycles. This three-dimensional, ordered, macro/mesoporous structure provides a greater specific surface area, reduces local current density, and contains a lithiophilic Zn coating that serves as preferred Li nucleation sites. By combining these factors, dendrite-free Li deposition and superior electrochemical performance improvements in LMBs have been realized.