Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 25, Pages 21077-21082Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05599
Keywords
interfacial resistance; lithium garnets; hybrid electrolyte; additives; cyclibility
Funding
- National Natural Science Foundation of China [11304198]
- SAST-SJTU fund [USCAST-2015-40]
- SJTU Materials Genome Initiative Center grant [15X190030002]
- SMC-Chen Xing Young Scholar Award of SJTU
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To improve the solid-electrolyte/electrode interface compatibility, we have proposed the concept of hybrid electrolyte by including a small amount of liquid electrolyte in between. In this work, n-BuLi, a superbase, has been found to significantly improve the cycling performance of LiFePO4/Li hybrid cells containing Li7La3Zr1.5Ta0.5O12 (LLZT) and conventional carbonate-based liquid electrolyte. The modified cells have been cycled for 400 cycles at 100 and 200 uA cm2 at room temperature, indicating excellent solid/liquid electrolyte interface stability. The role of n-BuLi may be 3-fold: to retard the decomposition reaction of LE, to suppress the Li+/H+ exchange, and to lithiate the garnet/LE interface, inhibiting side reactions and enhancing interfacial lithium-ion transport.
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