期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 3, 页码 4062-4071出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20871
关键词
nanocolloid electrolyte; Au nanoparticles; filmlike Li2O2; surface pathway; lithium-oxygen batteries
资金
- National Natural Science Foundation of China [51874051]
- Guangxi Natural Science Foundation [2018GXNSFAA281184, 2019GXNSFAA245046]
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20KF-4, 20AA-18]
- Guangxi Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources
- Bagui Scholar Program of Guangxi Province
Adding gold nanoparticles to the electrolyte of aprotic lithium-oxygen batteries can improve cyclic stability and energy density, leading to increased battery lifespan and enhanced performance.
Aprotic lithium-oxygen batteries currently suffer from poor cyclic stability and low achievable energy density. Herein, gold nanoparticles capped with mercaptosuccinic acid are dispersed in 1.0 M LiClO4/dimethyl sulfoxide (DMSO) as a novel electrolyte for lithium-oxygen batteries. Morphological and electrochemical analyses indicate that film-like amorphous lithium peroxide is formed using the gold nanocolloid electrolyte instead of bulk crystals in battery discharging, which apparently increases the conductivity and accelerates the decomposition kinetics of discharge products in recharging, accompanied by the release of incorporated gold nanoparticles with the decomposition of lithium peroxide into the electrolyte. Experiments and theoretical calculations further demonstrate that the suspended gold nanoparticles in the electrolyte can adsorb some intermediates generated by an oxygen reduction reaction, which effectively alleviates the cleavage of the electrolyte and impedes the corrosion of the lithium anode. As a result, the life span of lithium-oxygen batteries is dramatically increased from 55 to 438 cycles, and the rate performance and full-discharge capacity are also massively enhanced. The battery failure is attributed to the degradation of gold nanocolloid electrolytes, and further studies on improvement of colloid stability during battery cycling are underway.
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