Ritu Sahore
Argonne National Laboratory
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Publication
Featured researches published by Ritu Sahore.
Journal of Materials Chemistry | 2018
Ritu Sahore; Adam Tornheim; Cameron Peebles; Juan C. Garcia; Fulya Dogan; Daniel C. O'Hanlon; Chen Liao; Hakim Iddir; Zhengcheng Zhang; Javier Bareño; Ira Bloom
Use of electrolyte additives is a promising route to address surface destabilization issues of lithium transition metal (TM)-oxide cathodes (for example, lithium nickel-manganese-cobalt oxides (NMCs)) that occur as they are charged to high voltages (>4.3 V vs. Li/Li+). Despite the successful discovery of several additives, their working mechanisms are often vaguely understood. In this work, we provide a methodology to comprehensively understand additive/cathode interactions in lithium-ion batteries. A case of the tris(2,2,2-trifluoroethyl)phosphite (TTFP) additive is presented where its decomposition behavior was investigated at 4.6 V vs. Li/Li+ in a Li4Ti5O12 (LTO)/Li1.03(Ni0.5Mn0.3Co0.2)0.97O2 (NMC532) cell. Overall, we found that while some of the additive does modify the surface film on the cathode and binds at the surface, it does not passivate the cathode surface towards electrolyte oxidation. Rather, the majority of the TTFP forms stable, free tris(2,2,2-trifluoroethyl)phosphate (TTFPa) molecules by removing O atoms from the charged NMC cathode surface, some of which then further react with the electrolyte solvents and stay in solution. Finally, we propose a stable configuration in which TTFP is bound to the cathode surface via a P–O–TM bond, with one of the –CH2CF3 side groups removed, leading to the formation of BTFPa (bis(2,2,2-trifluoroethyl)phosphate). We anticipate that these techniques and findings could be extended to other additives as well, especially phosphite-based additives, allowing the effective design of future additives.
Journal of The Electrochemical Society | 2017
Cameron Peebles; Ritu Sahore; James A. Gilbert; Juan C. Garcia; Adam Tornheim; Javier Bareño; Hakim Iddir; Chen Liao; Daniel P. Abraham
Journal of Power Sources | 2017
Adam Tornheim; Cameron Peebles; James A. Gilbert; Ritu Sahore; Juan C. Garcia; Javier Bareño; Hakim Iddir; Chen Liao; Daniel P. Abraham
Journal of Power Sources | 2017
Ritu Sahore; Cameron Peebles; Daniel P. Abraham; James A. Gilbert; Ira Bloom
Journal of The Electrochemical Society | 2018
Adam Tornheim; Ritu Sahore; Meinan He; Jason R. Croy; Zhengcheng Zhang
Journal of Physical Chemistry C | 2018
Cameron Peebles; Juan F. Godoy García; Adam Tornheim; Ritu Sahore; Javier Bareño; Chen Liao; Ilya A. Shkrob; Hakim Iddir; Daniel P. Abraham
232nd ECS Meeting (October 1-5, 2017), | 2017
Ira Bloom; Ritu Sahore; Cameron Peebles; Daniel P. Abraham; James A. Gilbert
231st ECS Meeting (May 28 - June 1, 2017) | 2017
Adam Tornheim; Meinan He; Cameron Peebles; Juan F. Godoy García; Ritu Sahore; Fulya Dogan; Chen Liao; Hakim Iddir; Javier Bareño; Ira Bloom; Zhengcheng Zhang
231st ECS Meeting (May 28 - June 1, 2017) | 2017
Cameron Peebles; James A. Gilbert; Ritu Sahore; Juan F. Godoy García; Meinan He; Adam Tornheim; Wenquan Lu; Zhengcheng Zhang; Hakim Iddir; Javier Bareño; Daniel P. Abraham; Chen Liao
231st ECS Meeting (May 28 - June 1, 2017) | 2017
Cameron Peebles; James A. Gilbert; Adam Tornheim; Ritu Sahore; Juan F. Godoy García; Wenquan Lu; Hakim Iddir; Zhengcheng Zhang; Javier Bareño; Daniel P. Abraham; Chen Liao