Journal
ADVANCED SCIENCE
Volume 6, Issue 22, Pages -Publisher
WILEY
DOI: 10.1002/advs.201901036
Keywords
high voltage; Li metal; lithium salt; multilayered; poly(ethylene oxide) (PEO) electrolyte
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010600]
- National Key R&D Program of China [2018YFB0104300]
- National Natural Science Foundation for Distinguished Young Scholars of China [51625204]
- Youth Innovation Promotion Association of CAS [2016193]
- Key Research and Development Plan of Shandong Province, P. R. China [2018GGX104016]
- National Natural Science Foundation of China [U1706229]
- Key Program of the Chinese Academy of Sciences - QIBEBT [KFZDSW-414, ZZBS201808]
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Low ionic conductivity at room temperature and limited electrochemical window of poly(ethylene oxide) (PEO) are the bottlenecks restricting its further application in high-energy density lithium metal battery. Herein, a differentiated salt designed multilayered PEO-based solid polymer electrolyte (DSM-SPE) is exploited to achieve excellent electrochemical performance toward both the high-voltage LiCoO2 cathode and the lithium metal anode. The LiCoO2/Li metal battery with DSM-SPE displays a capacity retention of 83.3% after 100 cycles at 60 degrees C with challenging voltage range of 2.5 to 4.3 V, which is the best cycling performance for high-voltage (>= 4.3 V) LiCoO2/Li metal battery with PEO-based electrolytes up to now. Moreover, the Li/Li symmetrical cells present stable and low polarization plating/stripping behavior (less than 80 mV over 600 h) at current density of 0.25 mA cm(-2) (0.25 mAh cm(-2)). Even under a high-area capacity of 2 mAh cm(-2), the profiles still maintain stable. The pouch cell with DSM-SPE exhibits no volume expansion, voltage decline, ignition or explosion after being impaled and cut at a fully charged state, proving the excellent safety characteristic of the DSM-SPE-based lithium metal battery.
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