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Suppression of Mn-Ion-Dissolution of LiNi 0.5 Mn 1.5 O 4 Electrodes in a Highly Concentrated Electrolyte Solution at Elevated Temperatures

2017; Wiley; Volume: 2; Issue: 28 Linguagem: Inglês

10.1002/slct.201701668

2365-6549

Takayuki Doi, Y. Shimizu, Ryo Matsumoto, Michihiro Hashinokuchi, Minoru Inaba,

Advanced Battery Technologies Research

ChemistrySelectVolume 2, Issue 28 p. 8824-8827 Communication Suppression of Mn–Ion-Dissolution of LiNi0.5Mn1.5O4 Electrodes in a Highly Concentrated Electrolyte Solution at Elevated Temperatures Dr. Takayuki Doi, Corresponding Author Dr. Takayuki Doi tdoi@mail.doshisha.ac.jp Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorYusuke Shimizu, Yusuke Shimizu Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorRyo Matsumoto, Ryo Matsumoto Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorDr. Michihiro Hashinokuchi, Dr. Michihiro Hashinokuchi Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorProf. Minoru Inaba, Prof. Minoru Inaba Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this author Dr. Takayuki Doi, Corresponding Author Dr. Takayuki Doi tdoi@mail.doshisha.ac.jp Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorYusuke Shimizu, Yusuke Shimizu Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorRyo Matsumoto, Ryo Matsumoto Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorDr. Michihiro Hashinokuchi, Dr. Michihiro Hashinokuchi Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this authorProf. Minoru Inaba, Prof. Minoru Inaba Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321 JapanSearch for more papers by this author First published: 02 October 2017 https://doi.org/10.1002/slct.201701668Citations: 14Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Graphical Abstract Repeated charge/discharge cycles of a LiNi0.5Mn1.5O4 positive electrode were achieved at elevated temperature with use of nearly saturated 7.25 mol kg−1 LiBF4/PC electrolyte solution. Most of PC molecules solvate lithium-ions in the nearly saturated solution, and hence free PC molecules, which should solvate dissolved Mn ions, are very few. Therefore, the dissolution of Mn ions from the LiNi0.5Mn1.5O4 electrode was inhibited. Abstract Mn-based active materials, such as LiMn2O4, are widely used for positive electrodes in lithium ion batteries, and spinel LiNi0.5Mn1.5O4 is drawing much attention to realize 5-V class batteries. However, the oxidative decomposition of electrolyte solution at high voltages and Mn-dissolution of LiNi0.5Mn1.5O4 are serious problems to be solved. These two drawbacks are more marked at elevated temperatures, and should be caused by free solvent molecules in electrolyte solution. In this study, highly concentrated electrolyte solution, which contains few free solvent molecules, was investigated to solve the problems. LiNi0.5Mn1.5O4 electrodes worked at 50oC in nearly saturated 7.25 mol kg−1 LiBF4/ propylene carbonate (PC) electrolyte solution, whereas not in the nearly saturated 4.30 mol kg−1 LiPF6/PC. In addition, Mn-ion dissolution from LiNi0.5Mn1.5O4 was significantly suppressed in highly concentrated electrolyte solutions, and correlated to the fraction of free PC molecules in them. Citing Literature Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Filename Description slct201701668-sup-0001-misc_information.pdf162.1 KB Supplementary Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume2, Issue28September 29, 2017Pages 8824-8827 RelatedInformation