Electronic Thesis and Dissertation Repository

Thesis Format

Integrated Article

Degree

Master of Engineering Science

Program

Mechanical and Materials Engineering

Supervisor

Sun, Xueliang (Andy)

Abstract

Electrode design, which is closely related to electronic and ionic transport, has a significant impact on all-solid-state batteries' performance. Typically, a combination of the active material and solid electrolyte serves as the electrode for all-solid-state batteries. An effective scaling technique to spatially organize the two components is essential for high-performance all-solid-state batteries. Here, an electrode design for all-solid-state batteries is given with a higher energy density than the typical composite-type electrode. The first section of the thesis presents a simple electrode design that primarily consists of blended active materials of graphite and phosphorus to meet the demands of all-solid-state batteries for high power and high energy density. The second section uses hard carbon electrodes to discover new anode materials for the diffusion-dependent electrode structure for all-solid-state batteries. It is demonstrated that by increasing the amount of active material in the electrode, this electrode configuration significantly increases the normalized energy density.

Summary for Lay Audience

A successful design for all-solid-state electrodes is essential to achieve high-performance all-solid-state batteries. A typical structure to create well-percolated ionic channels within the electrode is a composite electrode, which is made up of well-mixed active material and solid electrolyte. Therefore, for high-performance all-solid-state batteries, an effective procedure to spatially organize the two components in a scalable manner is essential. In contrast, a newly developed method using interparticle diffusion between active material particles is called a diffusion-dependent electrode, primarily made of active material. Maximizing energy density and simplifying the manufacturing process are both made possible by this design. Herein, diffusion-dependent electrode design for all-solid-state batteries provides a higher energy density than the common composite-type electrode. The suggested electrode provides a seamless interface between the active materials, enabling interparticle lithium-ion diffusion. As a result, the solid electrolyte can be disregarded entirely during the electrode manufacturing process, allowing for greater procedure flexibility, and eliminating concerns regarding the incompatibility between solid electrolytes and active electrode materials. The first section of the thesis presents a straightforward electrode design that primarily consists of blended graphite and phosphorus active materials to satisfy the high power and high energy density requirements of all-solid-state batteries. The second section employs hard carbon electrode to show the capabilities of the diffusion-dependent electrode structure for all-solid-state batteries. It is demonstrated that increasing the amount of active material in the electrode can increase the normalized energy density. Thus, this electrode idea is a significant step forward for high-performance all-solid-state batteries.

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