Alkaline Double-Network Hydrogels with High Conductivities, Superior Mechanical Performances, and Antifreezing Properties for Solid-State Zinc-Air Batteries
Alkaline Double-Network Hydrogels with High Conductivities, Superior Mechanical Performances, and Antifreezing Properties for Solid-State Zinc-Air Batteries
复制标题
具有高电导率、优异机械性能和防冻性能的碱性双网络水凝胶用于固态锌空气电池
DOI：
10.1021/acsami.0c00325
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发表时间：
2020-03-11
影响因子：
9.5
通讯作者：
Zheng, Liqiang
中科院分区：
文献类型：
--
作者：
Sun, Na;Lu, Fei;Zheng, Liqiang
为了开发先进的柔性和可穿戴电子器件，需要设计具有优异导电性、耐温性和理想机械性能的功能电解质。本文设计了一种具有高电导率、上级力学性能和防冻性能的碱性双网络水凝胶，并有望用作全固态锌空气电池的柔性电解质。导电水凝胶由共价交联的聚（2-丙烯酰胺基-2-甲基丙磺酸钾盐）（PAMPS-K）和互穿甲基纤维素（MC）在浓碱性溶液的存在下组成。共价交联的PAMPS-K骨架和互穿的MC链赋予水凝胶良好的机械强度、韧性、极快的自恢复能力和优异的抗疲劳性能。令人满意的是，水凝胶基质中的浓缩碱性溶液的包埋产生了极高的离子电导率（在25 ℃下为105 mS cm（-1））和优异的防冻能力。水凝胶保持相当的导电性和合格的强度，以承受-20 ℃下的各种机械变形。使用PAMPS-K/MC水凝胶作为柔性碱性电解质的全固态锌空气电池表现出相当的比容量（764.7 mAh g（-1））、能量容量（850.2 mWh g（-1））、循环稳定性和机械柔性。即使工作温度降至-20 ℃，电池仍具有竞争力的电化学性能。
For the development of advanced flexible and wearable electronic devices, functional electrolytes with excellent conductivity, temperature tolerance, and desirable mechanical properties need to be engineered. Herein, an alkaline double-network hydrogel with high conductivity and superior mechanical and antifreezing properties is designed and promisingly utilized as the flexible electrolyte in all-solid-state zinc-air batteries. The conductive hydrogel is comprised of covalently cross-linked polyelectrolyte poly(2-acrylamido-2-methylpropanesulfonic acid potassium salt) (PAMPS-K) and interpenetrating methyl cellulose (MC) in the presence of concentrated alkaline solutions. The covalently cross-linked PAMPS-K skeleton and interpenetrating MC chains endow the hydrogel with good mechanical strength, toughness, an extremely rapid self-recovery capability, and an outstanding antifatigue property. Gratifyingly, the entrapment of a concentrated alkaline solution in the hydrogel matrix yields an extremely high ionic conductivity (105 mS cm(-1) at 25 degrees C) and an excellent antifreezing capacity. The hydrogel retains comparable conductivity and eligible strength to withstand various mechanical deformations at -20 degrees C. The all-solid-state zinc-air batteries using PAMPS-K/MC hydrogels as flexible alkaline electrolytes exhibit comparable values of specific capacity (764.7 mAh g(-1)), energy capacity (850.2 mWh g(-1)), cycling stability, and mechanical flexibility. The batteries still possess competitive electrochemical performances even when the operating temperature drops to -20 degrees C.