期刊
NANO ENERGY
卷 39, 期 -, 页码 262-272出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.07.002
关键词
K-sp of polysulfide; Shuttle effect inhibition; Lithium dendrite inhibition; Lithium sulfur battery; Practical soft package battery; Unmanned solar energy aircraft
类别
资金
- National Natural Science Foundation of China [51403209, 51677176, 51673199, 21406221, 51177156/E0712]
- Youth Innovation Promotion Association [2015148]
- Natural Sciences Foundation of Liaoning Province of China [2013020126]
- Youth Innovation Foundation of Dalian Institute of Chemical Physics
Although LiNO3 could effectively solve the polysulfide (PS) shuttle problem in Li-S battery, however, it causes explosive hazards with the cathode composition like gun powder (KNO3, Sulfur, and Carbon). Herein, a LiNO3-free electrolyte was designed to simultaneously inhibit the PS shuttle and lithium dendrite problem, with pure 1,3-dioxolane (DOL) as the solvent, due to the low K-sp of polysulfide as well as the stable SEI on lithium. As a synergistic effect, it enabled the Li-S batteries to achieve 95% coulombic efficiency, 3 times longer cycle life, and a slower self-discharging rate at 55 degrees C compared to the DOL/DME blend solvent. Four kinds of batteries, from coins to soft packages, were carried out to confirm the superiority of this electrolyte. Li-S soft package batteries with 4000 mAh capacity were assembled, achieving the specific energy of 350 Wh kg(-1) and specific power of 60 W kg(-1), which could cycle over 30 times at 0.2 C with high capacity retention of 80%. It is among the best comprehensive Li-S batteries performance reported using LiNO3-free electrolyte.
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