Wednesday, 16 May 2018: 16:40
Room 608 (Washington State Convention Center)
Recent research in electrochemical storage devices focus not only on improving lithium ion batteries technique (e.g. safety, energy density) but also on utilizing different storage types such as sodium ion batteries, lithium sulfur batteries, and super-capacitors. Among various topics of energy storage devices, biomass derived carbon has attracted interest for its economic and environment benefits. Pistachio shell has been used in this study for its structural benefits for various energy storage application. Pistachio shell derived carbon (PC) shows a macroporous channel and micro-pores architecture. The macroporous channel enables facile penetration of ions and electrolyte into the material while micro-pores provides more active sites and withstand the volume expansion of ions during repeated charge/discharge cycles. This makes this material attractive for lithium ion / sodium ion / lithium sulfur batteries and even super-capacitor. In this work, the characteristics of pistachio shell structure and its performances in sodium ion and Li-S batteries is presented. The optimum carbonization temperature for pistachio shell is studied to maximize the performance in sodium ion batteries. In-depth study on plausible sodium storage mechanism by understanding the characteristics of PC (surface area, crystal information) at different temperature is conducted as well. Further application using PC as a sulfur reservoir to restrict the polysulfide shuttling effect in Li-S batteries is purposed. Fundamental study (e.g. Raman, XPS, SEM) on how PC structure and chemical anchor improves the cyclability of Li-S batteries is discussed. This work successfully shows promising result with using pistachio shell in different energy storage systems.