Wide-Temperature Electrolytes for Lithium-Ion Batteries

ACS Applied Materials & Interfaces
Qiuyan LiWu Xu

Abstract

Formulating electrolytes with solvents of low freezing points and high dielectric constants is a direct approach to extend the service-temperature range of lithium (Li)-ion batteries (LIBs). In this study, we report such wide-temperature electrolyte formulations by optimizing the ethylene carbonate (EC) content in the ternary solvent system of EC, propylene carbonate (PC), and ethyl methyl carbonate (EMC) with LiPF6 salt and CsPF6 additive. An extended service-temperature range from -40 to 60 °C was obtained in LIBs with lithium nickel cobalt aluminum oxide (LiNi0.80Co0.15Al0.05O2, NCA) as cathode and graphite as anode. The discharge capacities at low temperatures and the cycle life at room temperature and elevated temperatures were systematically investigated together with the ionic conductivity and phase-transition behaviors. The most promising electrolyte formulation was identified as 1.0 M LiPF6 in EC-PC-EMC (1:1:8 by wt) with 0.05 M CsPF6, which was demonstrated in both coin cells of graphite∥NCA and 1 Ah pouch cells of graphite∥LiNi1/3Mn1/3Co1/3O2. This optimized electrolyte enables excellent wide-temperature performances, as evidenced by the high capacity retention (68%) at -40 °C and C/5 rate, significantly higher than ...Continue Reading

Citations

Jul 16, 2020·Chemical Communications : Chem Comm·Guorui CaiZheng Chen
Jun 24, 2021·Advanced Energy Materials·Abhay Gupta, Arumugam Manthiram
Nov 18, 2017·ACS Applied Materials & Interfaces·Qiuyan LiWu Xu
Jul 17, 2019·ACS Applied Materials & Interfaces·Yinping QinDeyu Wang
Sep 25, 2021·Chemistry : a European Journal·Qian LiJun Ming

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