Improved thermal stability of graphite electrodes in lithium-ion batteries using 4-isopropyl phenyl diphenyl phosphate as an additive

Abstract

To enhance the thermal stability of graphite electrodes for lithium-ion batteries, 4-isopropyl phenyl diphenyl phosphate (IPPP) was investigated as an additive in the electrolyte of 1.0 M LiPF 6 in ethylene carbonate and diethyl carbonate (1:1 in weight). The electrochemical performance of Li/IPPP-electrolyte/C half cells was evaluated. The thermal behavior of Li x C 6 and Li x C 6 -IPPP-electrolytes were examined using a C80 micro-calorimeter. Electrolytes with 5 and 10% IPPP improve the thermal stability of the graphite electrode in the tests. The electrochemical performance of Li/IPPP-electrolyte/C cells is not degraded by the addition of this amount of IPPP to the electrolyte.

Additives for Functional Electrolytes of Li-Ion Batteries

“…Examples of this group include substituted cyclic carbonates [52,178], sulfates [41,146], sulfites [123], sultones [59,76], phosphates [98,132], and possibly other compounds that have heteroatoms with high oxidation states (Fig. 2).…”

Optimizing the compatibility between dimethyl methylphosphonate (DMMP)-based electrolytes and carbonaceous anodes

“…However, safety concern is one of the biggest barriers for the development of large-size lithium-ion batteries because of the use of the flammable electrolytes. To solve this problem, the most economic and efficient way is to use the flame-retarded electrolytes [1][2][3][4][5][6][7][8]. In the previous investigations, dimethyl methylphosphonate (DMMP) was reported as a highly efficient flame retardant for the electrolyte of the lithium-ion batteries [9][10][11][12][13].…”