Session: 17-01-01 Research Posters

Paper Number: 77594

Start Time: Thursday, 02:25 PM

77594 - Stable Electrode Materials for Alkali Metal-Ion Batteries: Silicon Oxycarbide Functionalized Transition Metal Dichalcogenides 

With the ever-growing demand of energy, the rate at which fossil fuels are consumed is sloping upward which will result in the depletion of the resources of fossil fuel. Keeping the sources of fossil fuel in check is a convoluted process which includes the persuasion of environment friendly energy alternatives, including renewable energy sources (such as solar, wind, tidal, geothermal and hydro). But to make the maximum use of these energy generating resources, the development of current Energy Storage Systems (ESS) is a must. The electrochemical way of energy storage is an optimal choice based on its low capital cost with compactness, high energy density, high round-trip efficiency, and long cycle life; thus putting the focus on Alkali metal ion batteries. For Alkali metal-ion batteries, a well performing electrode material should possess properties such as high ion mobility and intercalation voltage, which drew the attention towards nano-structural materials. These materials can significantly shorten the metal ion diffusion path. The research of nanomaterials shed light on transition metal dichalcogenides (TMDs), which are potential candidates for Alkali metal-ion battery electrodes as they possess properties such as weak force between layers - of interest for faster ion-intercalation, and conversion chemistry with lithium-ions. However, shortcomings such as capacity decay, and degradation reaction with electrolytes at low discharge potential continues to hinder their use in rechargeable batteries. However, Polymer derived ceramics (PDCs) have the ability of storing lithium; thus, making them feasible electrode material for Li-ion batteries which can be a good alternative to pure carbon. For instance, PDCs such as silicon oxycarbide (SiOC) exhibit stable longer term cyclability towards Li⁺ due to PDCs’ robust nanodomain structure. SiOC functionalized TMDs via polymer pyrolysis route can be beneficial in overcoming the shortcomings of neat TMDs; thus, leading to a composite electrode material possessing long term stable cycling in Li and other alkali metal-ion batteries. Additionally, the inception of wearable electronic devices has brought about the need of producing batteries that not only maintain the quality of fast charging but also flexibility. For such batteries bendable freestanding electrode is a must which has the benefit of dense structural design without the requirement of adding binders and conductive additives. Herein, we report fabrication of SiOC functionalized TMDs (e.g., MoS₂, MoTe₂, MoSe₂) in fibermat form which can be used as a freestanding electrode in Li-ion cells. Characterization of the structure of SiOC functionalized TMD fiber mats was carried out via electron microscopy and spectroscopic techniques (such as SEM, TEM, XPS, Raman Spectroscopy and FTIR). The electrochemical analysis of the electrodes showed improved cycle stability and capacity retention which are the signs of a promising Li-ion battery electrode.

Presenting Author: Sonjoy Dey Kansas State University

Authors:

Sonjoy Dey Kansas State University
Gurpreet Singh Kansas State University