Wang QS, Sun JH (2007) Enhancing the safety of lithium ion batteries by 4-isopropyl phenyl diphenyl phosphate. Materials Letters 61(16), 3338-3340. [In English]

Web link: http://dx.doi.org/10.1016/j.matlet.2006.11.060

Keywords:

thermal properties; surfaces; lithium ion batteries; safety; 4-isopropyl; phenyl diphenyl phosphate; thermal-stability; electrolyte; graphite

Abstract: To enhance the safety of lithium ion batteries, 4-isopropyl phenyl diphenyl phosphate (IPPP) was explored as an additive in 1.0 M LiPF6/ethylene carbonate (EC)+diethyl carbonate (DEC) (1:1 wt.%). The electrochemical performances of LiCoO2/IPPP electrolyte/C cells were tested. And then the LiCoO2/IPPP electrolyte/C cells were disassembled and wrapped to detect the thermal behaviors using a C80 microcalorimeter. The results indicated that 5% and 10% IPPP content in the electrolyte can enhance the safety of lithium ion batteries. Furthermore, the electrochemical performances of LiCoO2/IPPP electrolyte/C cells become slightly worse by using 5% and 10% IPPP content electrolyte. Therefore, 5-10% IPPP content in electrolyte can enhance the safety of lithium ion batteries with minimum sacrifice in electrochemical performance. (C) 2006 Elsevier B.V. All rights reserved.