The truth about the 1st cycle Coulombic efficiency of LiNi1/3Co1/3Mn1/3O2 (NCM) cathodes

Physical Chemistry Chemical Physics : PCCP
J KasnatscheewMartin Winter

Abstract

The 1st cycle Coulombic efficiency (CE) of LiNi1/3Co1/3Mn1/3O2 (NCM) at 4.6 V vs. Li/Li(+) has been extensively investigated in NCM/Li half cells. It could be proven that the major part of the observed overall specific capacity loss (in total 36.3 mA h g(-1)) is reversible and induced by kinetic limitations, namely an impeded lithiation reaction during discharge. A measure facilitating the lithiation reaction, i.e. a constant potential (CP) step at the discharge cut-off potential, results in an increase in specific discharge capacity of 22.1 mA h g(-1). This capacity increase during the CP step could be proven as a relithiation process by Li(+) content determination in NCM via an ICP-OES measurement. In addition, a specific capacity loss of approx. 4.2 mA h g(-1) could be determined as an intrinsic reaction to the NCM cathode material at room temperature (RT). In total, less than 10.0 mA h g(-1) (=28% of the overall capacity loss) can be attributed to irreversible reactions, mainly to irreversible structural changes of NCM. Thus, the impact of parasitic reactions, such as oxidative electrolyte decomposition, on the irreversible capacity is negligible and could also be proven by on-line MS. As a consequence, the determination of...Continue Reading

References

Mar 26, 2004·Analytical and Bioanalytical Chemistry·M R WagnerM Winter
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Apr 13, 2010·Nature Materials·Wolfgang DreyerMiran Gaberscek
May 12, 2015·Physical Chemistry Chemical Physics : PCCP·Tomoya KawaguchiEiichiro Matsubara

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Citations

Oct 30, 2016·ACS Applied Materials & Interfaces·Ralf WagnerMartin Winter
Mar 1, 2017·Journal of the American Chemical Society·Simon H PangChristopher W Jones
Apr 26, 2017·Chemical Society Reviews·Wangda LiArumugam Manthiram
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·S Wiemers-MeyerS Nowak
Sep 20, 2017·Physical Chemistry Chemical Physics : PCCP·Florian HoltstiegeTobias Placke
Jan 7, 2020·Physical Chemistry Chemical Physics : PCCP·Tao FengGuangshe Li
May 10, 2020·The Journal of Chemical Physics·C H KrauseM Winter
Apr 20, 2018·Topics in Current Chemistry·Johannes KasnatscheewIsidora Cekic-Laskovic
Aug 3, 2019·Nature Communications·Lianfeng ZouChongmin Wang
Jan 9, 2018·Chemical Society Reviews·Alok M TripathiBing Joe Hwang
Nov 21, 2020·Angewandte Chemie·Mingyuan GeFeng Wang
Mar 24, 2020·Journal of the American Chemical Society·Antonin GrenierKarena W Chapman
Aug 13, 2021·Chemical Communications : Chem Comm·Jihui ZhengBin Qian
Mar 1, 2019·ACS Applied Materials & Interfaces·Chun-Xian ZhouJun-Chao Zheng
Sep 15, 2021·ACS Applied Materials & Interfaces·Hongzheng WuWenhui Yuan

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