The effect of additives on lithium cycling in methyl acetate

✍ Scribed by R.D. Rauh; S.B. Brummer

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 556 KB
• Volume: 22
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(77)85058-5

✦ Synopsis

Methyl acetate (MA) was examined as a solvent for use in non-aqueous secondary lithium batteries. The efficiency of cycling lithium on nickel in MA/l M LiClO, containing less than 10 ppm H,O was less than 10%. Addition of nitromethane (NM), SO, or small amounts of H,O improved the efficiency markedly. Compared to propylene carbonate (PC), MA plus SOz or NM afforded more repeated cycles before failure of the working electrode. Unlike PC, the open circuit lithium disappearance rate in MA is decreased in the presence of additives, eg from about 300 PA/cm*-70 PA/cm2 with >0.2 M nitromethane, and to essentially 0 $./cmz, under the proper conditions, with 3 M SO,. The differences in behavior between PC and MA are attributed to the greater solubility of the MA-lithium reaction products, allowing greater opportunity for buildup of additive-induced conductive films on the metallic deposit.