Agricultural Waste Derived Anodes for Lithium and Sodium Ion Batteries
Guest Speaker：Prof.Richard M. Laine，University of Michigan，USA
Inviter: Prof. Jianxin Zou
Date&Time: Wednesday, 2 July, 10:00-11:00
Venue: Yiucheng Lecture Hall (500), Xu Zuyao Building
Biography:
Professor Rick Laine is a faculty member in both Materials Science and Eng. and Macromolecular Science and Eng. at the University of Michigan. He received his B. S. in chemistry at Cal. State University Northridge followed by a Ph.D. at the University of Southern California. After several postdocs, he spent 11 years at Stanford Research Institute (SRI International) followed by three years in MSE at the University of Washington before coming to UM. His research interests include novel ceramic processing methods and the development of silicon containing polymers for electronic and photonic applications. He has > 300 publications, 45 patents and H factor of 72.
Abstract:
Hard or turbostratic carbon anodes are most often derived from thermolysis of biomass in inert atmospheres. Considerable published data suggest that low surface area HC offers the most stable materials for lithiation and sodiation. In our efforts to valorize rice hull ash (RHA, 90 wt % SiO2/8 wt % C), produced in 150k ton/yr in the U.S. alone; we learned to distillatively remove SiO2 to produce silica depleted RHA or SDRHA25-70 (25-70 wt.% SiO2). SDRHAxx consists of C and SiO2 nanocomposites.
SDRHAxx readily undergoes carbothermal reduction to electronics grade silicon (SiPV, 5’9’s purity) or SiC (Ar) or Si2N2O (90N2/10H2) or Si3N4 (N2) at much lower temperatures (1250 -1500 °C) than used commercially and at higher purities.
We have previously found that SiC can serve as anode materials (coin cells) offering capacities of ≈ 950 mAh/g after long term cycling. In this talk we discuss our discovery that SDRHA carbon can be used as a novel anode material offer lithium ion battery anodes with capacities up to 740 mAh/g twice that of graphite with exceptional savings in energy, equipment and CO2.