Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (Supp): 1-4.doi: 10.3866/PKU.WHXB2007Supp01

• ARTICLE •     Next Articles

Performance of Liquid Electrolyte for Lithium-ion Battery at Elevated-temperature

GUO Ying-Jun; LI Qi-Qi-Ge; NING Ying-Kun; QI Lu; TANG Hong-Wu   

  1. CITIC Guoan Mengguli New Engery Technology Co. Ltd., Beijing 102200, P. R. China; New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemical and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-01-04
  • Contact: QI Lu

Abstract: A new functional electrolyte was developed to improve the cycling performance of LiMn2O4 spinel at elevated temperatures. The so-called high-temperature electrolyte was formed by adding additive Li2CO3 into conventional LiPF6 electrolyte solutions. The Li2CO3 could greatly surpress the production of hydro fluoric acid in electrolyte solution even at elevated temperatures. With the increase of Li2CO3 ratio in electrolyte solution, the HF contents decreased. Electrochemical measurements of 6 Ah lithium-ion batteries with spinel LiMn2O4 as cathode material showed that additive Li2CO3 could greatly improve the elevated temperature (55 ℃) cycling performance of spinel LiMn2O4 lithium-ion batteries.

Key words: Lithium-ion battery, Lithiummanganese oxide spinel, Li2CO3, Electrolyte for elevated temperature, Elevated-temperature cycling


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