title: In Situ Raman Spectroscopic Studies on Concentration of Electrolyte Salt in Lithium-Ion Batteries by Using Ultrafine Multifiber Probes.
abstract: Lithium-ion batteries have attracted considerable attention due to their high power density. The change in concentration of salt in the electrolyte solution in lithium-ion batteries during operation causes serious degradation of battery performance. Herein, a new method of in situ Raman spectroscopy with ultrafine multifiber probes was developed to simultaneously study the concentrations of ions at several different positions in the electrolyte solution in deep narrow spaces between the electrodes in batteries. The total amount of ions in the electrolyte solution clearly changed during operation due to the low permeability of the solid-electrolyte interphase (SEI) at the anode for Li+permeation. The permeability, which is a key factor to achieve high battery performance, was improved (enhanced) by adding film-forming additives to the electrolyte solution to modify the properties of the SEI. The results provide important information for understanding and predicting phenomena occurring in a battery and for designing a superior battery. The present method is useful for analysis in deep narrow spaces in other electrochemical devices, such as capacitors.
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Toshiro
authors.identifier: 0000-0001-5784-0025
authors.initials: T
authors.lastname: Yamanaka
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Hiroe
authors.initials: H
authors.lastname: Nakagawa
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Shigetaka
authors.initials: S
authors.lastname: Tsubouchi
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Domi
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Doi
authors.affiliation: Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Abe
authors.affiliation: Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
authors.forename: Zempachi
authors.initials: Z
authors.lastname: Ogumi
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D012492:Salts / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
chemical_list: D012492:Salts; D008094:Lithium
keywords: Raman spectroscopy; electrochemistry; in situ analysis; lithium; thin films