Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 7, Pages 5292-5299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01032
Keywords
polymer electrolyte; lithiation; dual insurance; electrospinning; wide temperature range
Funding
- National Natural Science Foundation of China (NSFC) [51503005, 21274006]
- Programs for Beijing Science and Technology Leading Talent [Z161100004916168]
- Fundamental Research Funds for the Central Universities [06500100]
- Ten thousand plan National High-level personnel of special support program, China
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Li-metal batteries show great potential in energy storage devices but still suffer a lot from dendrite growth, which restricts its long-time application due to safety and cycling concerns. Here, a dual insurance system is reported to avoid short-circuit occurrence and cycling performance decline through a two-step procedure. An Al2O3/PVDF-HFP layer is sandwiched into the in situ polymerized PMMA coat. The PMMA is so hard that the dendrites are not easy to impale; moreover, the electrospun Al2O3/PVDF-HFP layer could react with plunged lithium dendrites and inhibit the short circuit from occurring. Not only does the obtained composite polymer electrolyte (CPE) ensure desirable ionic conductivity (3.43 X 10(-4) S cm(-1) at 25 degrees C), wide electrochemical window, and considerable cycling stability but also dendrite inhibition and cycling stability are improved. The assembled full cell could cycle steadily under a wide temperature range and current density with desirable performance, when compared with abnormal cycling of liquid electrolyte under elevated temperatures. This work combines two methods to ensure the safety of Li-metal batteries, which enlightens a new thought for safe electrolyte design.
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