Journal
CHEMICAL ENGINEERING JOURNAL
Volume 387, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124089
Keywords
Solid-state batteries; Garnet electrolytes; Li6.375La3Zr1.375Nb0.625O12 nanoparticles; Reactive interfaces; Conducting networks
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Funding
- National Key R&D Program of China [2018YFB0104300]
- National Natural Science Foundation of China [51532002, 51771222]
- National Science Foundation of Shangdong Province [ZR201702180185]
- China Postdoctoral Science Foundation [2018M632617]
- Taishan Scholars Program
- Project of Qingdao Leading Talents in Entrepreneurship and Innovation
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The garnet solid electrolyte battery confronts crucial challenges of electronic/ionic conduction inside the cathode and interfacial contact between the cathode and the electrolyte. In this report, a super ion/electron conductive LiCoO2 (LCO) material is fabricated by partially coating nano Li6.375La3Zr1.375Nb0.625O12 (LLZNO) electrolyte on LCO and then filling Super P carbons into the uncoated space. This configuration offers continuous ionically and electronically conducting networks inside the LCO cathode. In addition, an intermediate layer of N-Methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13-TFSI) is introduced in between the composite cathode and the garnet electrolyte to form a solid-state ionically conducting interphase during charge/discharge cycles. Through the above interfacial engineering, the solid garnet batteries based on LiCoO2 run as long as 400 cycles with the capacity retention of 80.2% at 0.2 C and 60 degrees C.
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