Cycle stability of conversion-type iron fluoride lithium battery cathode at elevated temperatures in polymer electrolyte composites

Metal fluoride conversion cathodes offer a pathway towards developing lower-cost Li-ion batteries. Unfortunately, such cathodes suffer from extremely poor performance at elevated temperatures, which may prevent their use in large-scale energy storage applications. Here we report that replacing commo...

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Bibliographic Details
Published in:Nature materials 2019-12, Vol.18 (12), p.1343-1349
Main Authors: Huang, Qiao, Turcheniuk, Kostiantyn, Ren, Xiaolei, Magasinski, Alexandre, Song, Ah-Young, Xiao, Yiran, Kim, Doyoub, Yushin, Gleb
Format: Article
Language:English
Subjects:
Cathodes
Commercialization
Conversion
Electrolytes
Energy storage
Fluorides
High temperature
Lithium
Lithium batteries
Lithium-ion batteries
Mechanical properties
Metal fluorides
Molten salt electrolytes
Nonaqueous electrolytes
Polymer matrix composites
Polymers
Rechargeable batteries
Solid electrolytes
Structural stability
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Summary:Metal fluoride conversion cathodes offer a pathway towards developing lower-cost Li-ion batteries. Unfortunately, such cathodes suffer from extremely poor performance at elevated temperatures, which may prevent their use in large-scale energy storage applications. Here we report that replacing commonly used organic electrolytes with solid polymer electrolytes may overcome this hurdle. We demonstrate long-cycle stability for over 300 cycles at 50 °C attained in high-capacity (>450 mAh g ) FeF cathodes. The absence of liquid solvents reduced electrolyte decomposition, while mechanical properties of the solid polymer electrolyte enhanced cathode structural stability. Our findings suggest that the formation of an elastic, thin and homogeneous cathode electrolyte interphase layer on active particles is a key for stable performance. The successful operation of metal fluorides at elevated temperatures opens a new avenue for their practical applications and future successful commercialization.
ISSN:1476-1122
1476-4660
DOI:10.1038/s41563-019-0472-7