Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 40, Pages 34322-34331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b12579
Keywords
electrolyte additive; nanostructured fluoride; solid electrolyte; ionic liquid; Li dendrite suppression; Li metal batteries
Funding
- National Key R&D Program of China [2016YFB0901600]
- National Natural Science Foundation of China [51772313, U1830113]
- Hundred Talents Program of Chinese Academy of Sciences
- Thousand Talents Program of Shanghai
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Blending additive with electrolyte is a facile and effective method to suppress anode dendrite growth in Li metal batteries (LMBs), especially when a LiF-rich solid electrolyte interface (SEI) is formed as a consequence of additive decomposition or deposition. However LiF still suffers from poor bulk ion conductivity as well as the difficult access to tailored nanostructure. Exploring new Li fluoride of high Li-ion conductivity as SEI component is still a big challenge in view of the lacking of desired structure prototype or mineral phase. Here, we propose a Li-rich Li(3)AIF(6) derivative from cryolite phase as solid electrolyte additive, which is characterized by textured nanoporous morphology and ionic liquid coating. Its room temperature ion conductivity is as high as similar to 10(-5) S/cm with a low activation energy of 0.29 eV, the best level among fluoride-based solid electrolytes. These features guarantee a homogenization of Li+ fluxing through bulk and grain boundary of Li3AlF6-rich SEI and reinforce the effect on Li dendrite suppression. Li(3)AIF(6) additive enables a stable cyclability of Li parallel to Li symmetric cells for at least 100 cycles even under a high areal capacity of 3 mA h/cm(2) and a significant improvement on capacity retention for various LMBs based on LiFePO4, FeS2, and S cathodes.
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