Impact of a Gold Nanocolloid Electrolyte on Li2O2 Morphology and Performance of a Lithium?Oxygen Battery
writer：Zhihong Luo, Fujie Li, Chengliang Hu, Degui Li, Yuancheng Cao, Keith Scott, Xiaojing Gong,* Kun Luo*
keywords：nanocolloid electrolyte, Au nanoparticles, filmlike Li2O2, surface pathway, lithium?oxygen batteries
source：期刊
specific source：ACS Appl. Mater. Interfaces 2021, 13, 4062?4071
Issue time：2021年
Aprotic lithium?oxygen batteries currently sufffferfrom poor cyclic stability and low achievable energy density.Herein, gold nanoparticles capped with mercaptosuccinic acid aredispersed in 1.0 M LiClO4/dimethyl sulfoxide (DMSO) as a novelelectrolyte for lithium?oxygen batteries. Morphological andelectrochemical analyses indicate that fifilm-like amorphous lithiumperoxide is formed using the gold nanocolloid electrolyte instead ofbulk crystals in battery discharging, which apparently increases theconductivity and accelerates the decomposition kinetics ofdischarge products in recharging, accompanied by the release ofincorporated gold nanoparticles with the decomposition of lithium peroxide into the electrolyte. Experiments and theoreticalcalculations further demonstrate that the suspended gold nanoparticles in the electrolyte can adsorb some intermediates generatedby an oxygen reduction reaction, which effffectively alleviates the cleavage of the electrolyte and impedes the corrosion of the lithiumanode. As a result, the life span of lithium?oxygen batteries is dramatically increased from 55 to 438 cycles, and the rate performanceand full-discharge capacity are also massively enhanced. The battery failure is attributed to the degradation of gold nanocolloidelectrolytes, and further studies on improvement of colloid stability during battery cycling are underway.