Petr Novák

Insertion electrode materials are included in the majority of ambient-temperature rechargeable batteries. The reason for their widespread application is the fact that electrochemical insertion ("electroinsertion") reactions are intrinsically simple and reversible. The term electroinsertion refers to a host/guest solid-state redox reaction involving electrochemical charge transfer coupled with insertion of mobile guest ions from an electrolyte into the structure of a solid host, which is a mixed electronic and ionic conductor. [...]

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemically Active Polymers for Rechargeable BatteriesPetr Novák, Klaus Müller, K. S. V. Santhanam, and Otto HaasView Author Information Paul Scherrer Institute, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland Battelle Institute, CH-1227 Carouge/GE, Switzerland Tata Institute of Fundamental Research, Colaba, Mumbai 400 005, India Paul Scherrer Institute, Electrochemistry Section, CH-5232 Villigen PSI, Switzerland Cite this: Chem. Rev. 1997, 97, 1, 207–282Publication Date (Web):February 5, 1997Publication History Received16 May 1995Revised28 August 1996Published online5 February 1997Published inissue 1 February 1997https://pubs.acs.org/doi/10.1021/cr941181ohttps://doi.org/10.1021/cr941181oresearch-articleACS PublicationsCopyright © 1997 American Chemical SocietyRequest reuse permissionsArticle Views15743Altmetric-Citations1459LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Electrochemical cells,Electrodes,Organic polymers,Plastics,Polymers Get e-Alerts

The cathode in rechargeable lithium-ion batteries operates by conventional intercalation; Li+ is extracted from LiCoO2 on charging accompanied by oxidation of Co3+ to Co4+; the process is reversed on discharge. In contrast, Li+ may be extracted from Mn4+-based solids, e.g., Li2MnO3, without oxidation of Mn4+. A mechanism involving simultaneous Li and O removal is often proposed. Here, we demonstrate directly, by in situ differential electrochemical mass spectrometry (DEMS), that O2 is evolved from such Mn4+ -containing compounds, Li[Ni(0.2)Li(0.2)Mn(0.6)]O2, on charging and using powder neutron diffraction show that O loss from the surface is accompanied by diffusion of transition metal ions from surface to bulk where they occupy vacancies created by Li removal. The composition of the compound moves toward MO(2). Understanding such unconventional Li extraction is important because Li-Mn-Ni-O compounds, irrespective of whether they contain Co, can, after O loss, store 200 mAhg(-1) of charge compared with 140 mAhg(-1) for LiCoO(2).