Thomas A. Yersak | Researchain

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Journal of Materials Chemistry | 2015

MIL-101(Fe) as a lithium-ion battery electrode material: a relaxation and intercalation mechanism during lithium insertion

JaeWook Shin; Min Kim; Jordi Cirera; Shawn Chen; Gregory J. Halder; Thomas A. Yersak; Francesco Paesani; Seth M. Cohen; Ying Shirley Meng

The electrochemical performance of a MIL-101(Fe) metal–organic framework (MOF) as a lithium ion battery electrode is reported for the first time. Iron metal centers can be electrochemically activated. The Fe3+/Fe2+ redox couple is electrochemically active, but not reversible over many cycles. A comparison between ex situ and in operando X-ray absorption spectroscopy (XAS) on the Fe K-edge is presented. Our results indicate that the capacity fade is related to a time dependent, irreversible oxidation of Fe2+ to Fe3+. These results are key in proving the importance of in operando XAS measurements. The MOF side reaction with an electrolyte has been computationally modeled. These results provide further insights on the mechanism responsible for the MOF lack of reversibility. Future guidelines for improving the reversibility of MOFs used as electrodes in Li-ion batteries based on the fine-tuning of the electronic structure of the material are proposed.

Advanced Energy Materials | 2013

Solid State Enabled Reversible Four Electron Storage

Thomas A. Yersak; H. Alex Macpherson; Seul Cham Kim; Viet-Duc Le; Chan Soon Kang; Seoung-Bum Son; Yong-Hyun Kim; James E. Trevey; Kyu Hwan Oh; Conrad R. Stoldt; Se-Hee Lee

Advanced Energy Materials | 2012

A Highly Reversible Nano‐Si Anode Enabled by Mechanical Confinement in an Electrochemically Activated LixTi4Ni4Si7 Matrix

Seoung-Bum Son; Seul Cham Kim; Chan Soon Kang; Thomas A. Yersak; Yoon-Chang Kim; Chun-Gyoo Lee; Sung-Hwan Moon; Jong Soo Cho; Jeong-Tak Moon; Kyu Hwan Oh; Se-Hee Lee

Advanced Energy Materials | 2013

Conformal Coatings of Cyclized-PAN for Mechanically Resilient Si nano-Composite Anodes

Daniela Molina Piper; Thomas A. Yersak; Seoung-Bum Son; Seul Cham Kim; Chan Soon Kang; Kyu Hwan Oh; Chunmei Ban; Anne C. Dillon; Se-Hee Lee

Advanced Energy Materials | 2014

A Stabilized PAN-FeS 2 Cathode with an EC/DEC Liquid Electrolyte

Seoung-Bum Son; Thomas A. Yersak; Daniela Molina Piper; Seul Cham Kim; Chan Soon Kang; Jong Soo Cho; Soon-Sung Suh; Young-Ugk Kim; Kyu Hwan Oh; Se-Hee Lee

Journal of The Electrochemical Society | 2013

Effect of Compressive Stress on Electrochemical Performance of Silicon Anodes

Daniela Molina Piper; Thomas A. Yersak; Se-Hee Lee

Journal of The Electrochemical Society | 2013

Electrochemical Evolution of an Iron Sulfide and Sulfur Based Cathode for All-Solid-State Li-Ion Batteries

Thomas A. Yersak; Conrad R. Stoldt; Se-Hee Lee

Journal of The Electrochemical Society | 2013

An All-Solid-State Li-Ion Battery with a Pre-Lithiated Si-Ti-Ni Alloy Anode

Thomas A. Yersak; Seoung-Bum Son; Jong Soo Cho; Soon-Sung Suh; Young-Ugk Kim; Jeong-Tak Moon; Kyu Hwan Oh; Se-Hee Lee

ECS Electrochemistry Letters | 2012

Ambient Temperature and Pressure Mechanochemical Preparation of Nano-LiTiS2

Thomas A. Yersak; Yanfa Yan; Conrad R. Stoldt; Se-Hee Lee

Journal of The Electrochemical Society | 2014

Derivation of an Iron Pyrite All-Solid-State Composite Electrode with Ferrophosphorus, Sulfur, and Lithium Sulfide as Precursors

Thomas A. Yersak; Tyler Evans; Justin M. Whiteley; Seoung-Bum Son; Brian E. Francisco; Kyu Hwan Oh; Se-Hee Lee

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