3D lithiophilic–lithiophobic–lithiophilic dual-gradient porous skeleton for highly stable lithium metal anode
3D lithiophilic–lithiophobic–lithiophilic dual-gradient porous skeleton for highly stable lithium metal anode
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DOI：
10.1039/c9ta09505e
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发表时间：
2020
影响因子：
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通讯作者：
Hongfei Zheng;Qingfei Zhang;Qiulin Chen;Wanjie Xu;Qingshui Xie;Yuxin Cai;Yating Ma;Zhensong Qiao-Zhensong
中科院分区：
文献类型：
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作者：
Hongfei Zheng;Qingfei Zhang;Qiulin Chen;Wanjie Xu;Qingshui Xie;Yuxin Cai;Yating Ma;Zhensong Qiao-Zhensong
锂金属阳极被认为是可充电电池中最有前途的阳极，以满足不断增长的高能量密度要求。本文中，制造3D多孔亲锂-疏锂-亲锂双梯度Cu-Au-ZnO-PAN-ZnO（CAZPZ）集流体以抑制Li枝晶生长。底部的亲锂Au和ZnO有利于Li的均匀成核，ZnO-PAN-ZnO骨架提供了足够的空间容纳沉积的Li，锂化ZnO（Li 2 O/LixZn）层可以作为人工SEI来调节均匀分布的Li+通量。因此，在对称电池中实现了在0.5 mA cm−2下1200 h的长期稳定性和在3 mA cm−2下22 mV的低过电位。此外，当与LiFePO 4（LFP）阴极匹配时，CAZPZ-Li混合阳极表现出优异的电化学性能。CAZPZ-Li LiNbO_3 LFP全电池在5C下具有1000次循环的优异稳定性，具有97.3%的高容量保持率。用于Li金属阳极的3D多孔集流体的亲锂-疏锂-亲锂双梯度设计可以是使Li金属电池能够实际应用的非常有前景的策略。
The lithium metal anode has been considered the most promising anode in rechargeable batteries to meet the ever-increasing requirements of high energy density. Herein, a 3D porous lithiophilic–lithiophobic–lithiophilic dual-gradient Cu–Au–ZnO–PAN–ZnO (CAZPZ) current collector is fabricated to suppress Li dendrite growth. The lithiophilic Au and ZnO at the bottom are favorable for homogeneous Li nucleation, the ZnO–PAN–ZnO skeleton provides plenty of space to accommodate deposited Li and the lithiated ZnO (Li2O/LixZn) layer can act as an artificial SEI to regulate the well-distributed Li+ flux. As a result, long-term stabilization for 1200 h at 0.5 mA cm−2 and a low overpotential of 22 mV at 3 mA cm−2 are achieved in symmetric cells. Moreover, the CAZPZ–Li hybrid anode exhibits superb electrochemical properties when matched with a LiFePO4 (LFP) cathode. The CAZPZ–Li‖LFP full cells exhibit excellent stabilization for 1000 cycles at 5C with a high capacity retention of 97.3%. The lithiophilic–lithiophobic–lithiophilic dual-gradient design of the 3D porous current collector for the Li metal anode can be a very promising strategy to enable the practical application of Li metal batteries.