期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 6, 页码 7249-7256出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20436
关键词
single lithium-ion conductor; solid polymer electrolyte; electrochemical stability; lithium dendrite; lithium metal battery
资金
- National Key R&D Program of China [2018YFB0905400]
- Foundation of Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, P.R China [JJT-2017-05]
- Hunan Provincial Natural Science Foundation of China [2019B40359]
- Hunan Provincial ST Plan of China [2017TP1001, 2016TP1007]
- Fundamental Research Funds for Central Universities of the Central South University [2019zzts123]
- Open -End Fund for the Valuable and Precision Instruments of Central South University [CSUZC2020016]
Lithium metal batteries are being explored in meeting ever-increasing energy density needs. Because of serious dendritic lithium issues in liquid-state electrolytes, it is generally thought that solid-state electrolytes are potential alternatives for lithium metal batteries. Herein, we design a new single lithium-ion conducting lithium poly[(cyano)(4-styrenesulfonyl)imide] (LiPCSI) to replace the conventional dual-ion conducting salt for use in solid polymer electrolytes (SPEs) that successfully suppress the growth of lithium dendrites. Owing to highly delocalized anion moiety and oxidation-resistant cyano group, the tailored PEO8-LiPCSI SPE exhibits extremely high Li+ transference number 0.84) as well as oxidation potential (5.53 V vs Li+/Li). The symmetric Li/PEO8-LiPCSI/Li cell runs for 1000 h at 60 degrees C without a short circuit. The rechargeable Cycle number solid-state Li/PEO8-LiPCSI/LiFePO4 cell discharges a capacity of 141 mAh with retention over 85% during 80 cycles. These merits enable the proposed PEO8-LiPCSI SPE to be very promising for solid-state lithium metal battery applications.
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