Study of the LiMn_1.5Ni_0.5O₄/Electrolyte Interface at Room Temperature and 60°C

Abstract

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=18280097&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=18280097&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1149/1.3567954 Society, 158, 5, pp. A537-A545, 2011-03-23 Study of the LiMn or LiBF 4 as the salt, and the effect of cycling at different operating conditions (short and long storage time, state of charge and temperature) on the surface layer composition was assessed. Capacities reaching near the theoretical value of 140 mAh g À1 were obtained in half cells cycled at C=2 and room temperature, with 85% of the capacity being retained after 100 cycles. Cycling at 60 C leads to a decrease in capacity and coulombic efficiency. The surface analysis by XPS revealed that the CEI is composed of inorganic species such as LiF and Li x PF y O z or Li x BF y O z as well as organic species such as polyethers and carbonates. Generally, it was found that cycling or storing the material at 60 C with an electrolyte using LiPF 6 as a salt yield more organic species and less LiF at the surface than the one with LiBF 4 . Journal of the Electrochemical

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

“…The traditional LiPF6-based electrolyte often suffers from oxidative decomposition at elevated temperature, and then leads to the formation of unstable solid electrolyte interface (SEI) film on the electrode surface [49,50]. Furthermore, it is easy to make thermal decomposition of LiPF6 salt at elevated temperature, and then react with trace amounts of H2O accompanied by HF formation.…”

Electrolyte Formulations Based on Dinitrile Solvents for High Voltage Li-Ion Batteries

“…Solutions to this problem are centered around finding new optimized electrolyte formulations with new anodically more stable solvents and also additives that can properly passivate the cathode surface the same way they do to the anode. Electrolyte solutions based on molecular solvents with the sulfone functional group, -SO 2 -, were reported by Xu and Angell 6 and Sun and Angell 7 to exhibit a large stability window reaching 5.8 V. Abouimrane et al 8 demonstrated that tetramethylsulfone (TMS) can be used with ethyl-methyl carbonate (EMC) as co-solvent and LiPF 6 as salt in Li 4 Ti 5 O 12 /LiMn 1.5 Ni 0.5 O 4 full cells and reported good capacity. Sulfones, however, are not stable against graphitic carbon anodes and have in general a relatively high melting point (25 • C for TMS) and viscosity, limiting their room temperature and high-rate battery performance.…”

“…The use of TFSI − anion however limits the high voltage application of this particular mixture because it corrodes aluminum, the current collector for the cathode. Isken et al reported that LiTFSI could be successfully substituted by LiBF 4 12 in a binary electrolyte solution consisting of 0.9 M LiBF 4 EC:ADN 1:1 and was cycled in LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM, 4.3 V) cathode or graphite anode half cells for 50 cycles with low capacity fade and high coulombic efficiency. Nagahama et al 13 reported earlier that the electrolyte solution can be modified by adding dimethyl carbonate (DMC) to decrease the viscosity and increase the conductivity and still be stable up to 7 V. This ternary electrolyte solution was prepared for dinitrile solvents with chain length n = 3 (Glutaronitrile) up to n = 10 (Dodeconitrile).…”

“…Nagahama et al 13 reported earlier that the electrolyte solution can be modified by adding dimethyl carbonate (DMC) to decrease the viscosity and increase the conductivity and still be stable up to 7 V. This ternary electrolyte solution was prepared for dinitrile solvents with chain length n = 3 (Glutaronitrile) up to n = 10 (Dodeconitrile). Ultimately, they selected the composition 1 M LiBF 4 EC:DMC:Sebaconitrile (n = 8) in a ratio of 1:1:2 by volume to demonstrate successful cycling of commercial cathode materials (LiFePO 4 …”

Highly ordered LiFePO4 cathode material for Li-ion batteries templated by surfactant-modified polystyrene colloidal crystals

“…Five cycles were repeated at each C-rate: C/12, C/6, C, 2 C, 5 C, and back to C/12 again to check for any capacity fade after high C-rate cycling. During the first 10 cycles (at C/12 and C/6), capacity fade of 6% was observed that is commonly associated with increased resistances at the interface and the bulk electrode, with the former being more significant in this case due to the high surface area of the material [31]. After the tenth cycle, the capacity was stabilized and also recovered at low C-rate (C/12) with a 12% loss from the initial capacity (158 mAh g −1 ).…”