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2D Active Filler Modified Porous Polymer Network for Stabilizing Zn Anode Under Harsh Conditions
Haifeng Bian1, Changhao Wang2,3, Shunshun Jia1
1National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China.
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Artificial porous polymer coatings are promising for alleviating the side reactions and dendrite growth on Zn anodes. Nevertheless, the low ion transport ability constrains their application under harsh conditions such as thin Zn foil, high current density, and high depth of discharge (DOD). Herein, a 2D active filler is introduced to optimize the Zn2+ migration in porous polymer coating. Zirconium phosphate (ZrP) with unique interlayer transport channels, favorable ion exchange property, and good zincophilicity can effectively accelerate the Zn2+ transport in porous poly(methylmethacrylate) (PPMMA) network and enhance the protective effect. Consequently, the reversibility of Zn anode under harsh conditions is significantly enhanced, with an ultra-long cycle lifespan of 1000 h at 10 mA cm-2 (DOD = 5.7%) and 280 h at 20 mA cm-2 (DOD = 56.9%). In addition, the full cell with PPMMA/ZrP coated ultra-thin Zn anode (10 µm) also demonstrates excellent cycling stability over 3000 cycles.
