Interfacial adhesion of thin film high energy density anode materials

Diamond, Jacob M.

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https://hdl.handle.net/2142/109483 Copy

Description

Title

Interfacial adhesion of thin film high energy density anode materials

Author(s)

Diamond, Jacob M.

Issue Date

2020-10-21

Director of Research (if dissertation) or Advisor (if thesis)

Sottos, Nancy R.

Department of Study

Materials Science and Engineering

Discipline

Materials Science and Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Thin Films
• Adhesion
• Structured Anodes
• Laser Spallation

Abstract

Future energy storage needs are rapidly moving beyond the capabilities of current Li-ion battery technologies. The demand for greater energy density, performance, and longevity has led to the development of numerous three-dimensional (3D) structured anodes that can leverage the incredible Li storage capacity of silicon. A common feature among many 3D structured anodes is the use of a nickel (Ni) current collector scaffold coated with amorphous silicon (a-Si) active material. Despite the importance of a-Si remaining adhered to the Ni scaffold during cycling, little work has been done to study the interface strength of Ni/a-Si systems. Here, we investigate Ni/a-Si interfacial adhesion strength through the technique of laser spallation (LS) combined with finite element analysis (FEA). It was found that the Ni/a-Si interface can withstand at least ~250 MPa in tension before failure is initiated. Tests at higher stress levels were inconclusive due to consistent failure of the sample at the substrate/a-Si interface rather than the Ni/a-Si interface. Results also showed that the adhesion strength of Ni/a-Si was much weaker when a-Si was deposited by chemical vapor deposition (CVD) rather than electron-beam (e-beam) evaporation. This study brings insight to the durability Ni/a-Si structured anodes and will prove valuable in the design of future battery technologies.

Graduation Semester

2020-12

Type of Resource

Thesis

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http://hdl.handle.net/2142/109483

Copyright and License Information

Copyright 2020 Jacob Diamond

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