报告人：Dr. ZAHNG Ji-Guang(Jason), Pacific Northwest National Laboratory
Large scale deployment of electrical vehicles needs to have an energy storage system which has an energy density far exceeding those of the state of the art Li-ion batteries. In this work, our recent progresses on cathode, anode and electrolyte used in Li-ion batteries will be reported. We have optimized the composition of both Ni-rich NMC and electrolyte and enabled a high discharge capacity of >220 mAh/g (846 Wh/kg) and maintain a capacity retention higher than 80% after 1000 cycles. We also developed a new approach to reduce the cycling induced cracking in Ni-rich cathode materials. On the other hand, we further improved the performance of Si based anode using a hierarchical structured micrometer-size silicon (Si)/multi-walled carbon nanotube (MWNT) composite. The unique structure of Si/MWNT composite was synthesized via a scalable self-assembly process and subsequent aluminothermic reactions. Our recent progresses on Li-S and Li-air batteries will also be discussed.
Dr. Zhang is a Laboratory Fellow in the Energy Processes & Materials Division at Pacific Northwest National Laboratory (PNNL). He is the PI on PNNL’s efforts on Energy Storage for Transportation supported by the DOE/EERE/OVT office and PNNL’s Transformation Materials Science Initiative. He has 26 years of experience in the development of energy storage devices, including Li-ion batteries, Li-metal batteries, Li-air batteries, Li-S batteries, and thin-film solid-state batteries. He was the co-recipient of two R&D 100 awards, holds 22 patents (with another 18 patents pending), publishes more than 250 papers in refereed journals, and named as Highly Cited Researchers-2017 in both Materials Science and Engineering category.
1) Energy storage materials and devices: lithium batteries, lithium ion batteries and Li-S batteries;
2) Energy saving materials and devices: electrochromics materials and devices, thermochromic materials and devices;
3) Solid state electrolyte and solid state batteries: thin film batteries and solid state Li-S batteries.
Ph.D., in Experimental Condensed Matter Physics, University of Kentucky, 1990.
M.S., in Theoretical Physics, Dalian University of Technology, Dalian, China, 1984.
B.S., in Applied Physics, Dalian University of Technology, Dalian, China, 1982.