Filming mechanism of lithium-carbon anodes in organic and inorganic electrolytes Besenhard, J O [Inst. fuer Chemische Technologie Anorganischer Stoffe, Technische Univ., Graz (Austria)]; Winter, M [Inst. fuer Chemische Technologie Anorganischer Stoffe, Technische Univ., Graz (Austria)]; Yang, J [Inst. fuer Chemische Technologie Anorganischer Stoffe, Technische Univ., Graz (Austria)]; Biberacher, W [Walther-Meissner-Inst. fuer Tieftemperaturforschung, Garching (Germany)] 25 ENERGY STORAGE; GRAPHITE; ANODES; CLATHRATES; LAYERS; ELECTRIC BATTERIES; LITHIUM; SULFUR DIOXIDE; THIONYL CHLORIDES; DME; CARBONIC ACID ESTERS; FILMS; LITHIUM PERCHLORATES; POLAROGRAPHY To study the filming mechanism of graphite-based LiC{sub n} electrodes, electrochemical reduction of graphite materials was carried out in 1 M LiClO{sub 4}/ethylene carbonate (EC)-1,2-dimethoxyethane (DME) (1:1 by volume). Due to film forming a peak at potentials around 0.8 V versus Li/Li{sup +} was observed during the first reduction. The reversibility of this peak was examined by cyclic voltammetry; in addition, the crystal expansion/contraction was checked by means of dilatometry. The results indicate that ternary solvated graphite-intercalation compounds (GICs) were formed at those potentials leading to drastic expansion of the graphite matrix (>150%). These Li(EC){sub y1}(DME){sub y2}C{sub n}-GICs decompose and build up a protective layer on the graphite that prevents further solvent co-intercalation. The beneficial effect of EC-containing electrolytes on the stability of lithium-carbon anodes seems to be related to inorganic films formed via secondary chemical decomposition of electrochemically formed EC-GICs. The key-role of inorganic films is also demonstrated by the fact that inorganic additives, such as carbon dioxide, suppress the formation of solvated GICs. Furthermore, it can be seen that lithium-carbon negatives can even be operated in inorganic electrolytes such as SO{sub 2} and SOCl{sub 2}. (orig.) Switzerland 1995-04-01 English Journal Article Journal Name: Journal of Power Sources; Journal Volume: 54; Journal Issue: 2; Conference: 7. international meeting on lithium batteries (IMLB-7), Cambridge, MA (United States), 15-20 May 1994; Other Information: PBD: Apr 1995 Medium: X; Size: pp. 228-231 https://doi.org/10.1016/0378-7753(94)02073-C [] 2 54 CONF-940568- Journal ID: JPSODZ; ISSN 0378-7753; TRN: CH95GI367 CHF; SCA: 250903; PA: CHF-95:0GI367; EDB-95:147784; SN: 95001456422 2010-12-29 123073