期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 17, 页码 15537-15542出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b00758
关键词
flexible; bacterial cellulose; dual network; superior mechanical strength; electrolytes
资金
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
- National Natural Science Foundation of China [21373028, U1564206]
- Major achievements Transformation Project for Central University in Beijing [U1564206]
- Beijing Key Research and Development Plan [Z181100004518001]
Flexible solid-state zinc-air batteries are promising energy technologies with low cost, superior performance and safety. However, flexible electrolytes are severely limited by their poor mechanical properties. Here, we introduce flexible bacterial cellulose (BC)/poly(vinyl alcohol) (PVA) composite hydrogel electrolytes (BPCE) based on bacterial cellulose (BC) microfibers and poly(vinyl alcohol) (PVA) by an in situ synthesis. Originating from the hydrogen bonds among BC microfibers and PVA matrix, these composites form load-bearing percolating dual network and their mechanical strength is increased 9 times (from 0.102 MPa of pristine PVA to 0.951 MPa of 6-BPCE). 6-BPCE shows extremely high ionic conductivities (80.8 mS cm(-1)). In addition, the solid-state zinc-air batteries can stably cycle over 440 h without large discharge and charge polarizations equipped with zinc anode and Co3O4@Ni cathode. Moreover, flexible solid-state zinc-air batteries can cycle well at any bending angle. As flexible electrolytes, they open up a new opportunity for the development of superior-performance, flexible, rechargeable, zinc-air batteries.
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