Driven by solid-state lithium-ion batteries with both high safety and high energy density, solid electrolyte materials have experienced a rapid development in the past years. Various solid electrolytes have been developed and the electrolyte/electrode interfaces are being extensively investigated. Some challenges remain for the applications of solid electrolytes in lithium-ion batteries.
In this presentation, we talk about two kinds of solid electrolytes, oxide and composite electrolytes, and show high-performance solid-state lithium-ion batteries with these electrolytes. First, oxide electrolytes such as LLZO with high room-temperature lithium-ion conductivity and large electrochemical window are synthesized and characterized. A surface treatment is performed to significantly reduce the interfacial impedance between the LLZO electrolyte and the lithium anode. With the assistance of an in situ formed nanocomposite interfacial layer, the LiFePO4||LLZO||Li cells show a long-term cycle performance at high rates with a high capacity retention. Second, polymer-based composite electrolytes with high ionic conductivity and good flexibility are developed. The synthetic processes of several composite electrolytes are introduced. The compatibility between the composite electrolytes and the cathode or Li metal anode is discussed. With a rational design of composite electrolytes, high-performance solid-state lithium metal batteries are obtained.
- L. Li, et al., ACS Applied Materials & Interfaces, 11, 34939-34947, 2019.
- L. Li, et al., Advanced Materials, 31, 1806082, 2019.
- L. Li, et al., Journal of Materials Chemistry A, 6, 4649-4657, 2018.
- L. Li, et al., ACS Applied Materials & Interfaces, 10, 24791-24798, 2018.
Liangliang Li is currently an associate research fellow in School of Materials Science and Engineering at Tsinghua University, China. His research is on lithium-ion batteries and thermal management materials. He received a B.Eng. in materials science and engineering from Tsinghua University in 2002, a M.S. in electrical engineering and a Ph.D. in materials science and engineering from Stanford University in 2006 and 2007, respectively. He published ~80 academic papers and obtained 8 granted patents. He was the recipient of Outstanding Young Engineer Award of IEEE Electronic Packaging Society in 2015. He is the Vice-Chair of IEEE EPS Beijing Chapter and senior member of IEEE.