Inhibiting Polysulfide Shuttle in Lithium-Sulfur Batteries through Low-Ion-Pairing Salts and a Triflamide Solvent.
Inhibiting Polysulfide Shuttle in Lithium-Sulfur Batteries through Low-Ion-Pairing Salts and a Triflamide Solvent.
复制标题
DOI：
10.1002/anie.201701026
复制
发表时间：
2017-05
影响因子：
--
通讯作者：
Abhinandan Shyamsunder;W. Beichel;Petra Klose;Q. Pang;H. Scherer;Anke Hoffmann;Graham K. Murphy;
中科院分区：
文献类型：
--
作者：
Abhinandan Shyamsunder;W. Beichel;Petra Klose;Q. Pang;H. Scherer;Anke Hoffmann;Graham K. Murphy;
电化学能量存储设备为无人驾驶自动驾驶车辆、电动车辆提供动力并实现低成本清洁电网存储所需的重量能量密度的阶跃变化不太可能由常规锂离子电池提供。包含轻质元件的锂硫电池提供了一种有前景的替代方案，但典型的醚基电解质中相关的多硫化物穿梭产生容量损失和低库仑效率。第一个新的电解质的基础上的一个独特的组合，相对疏水的磺酰胺溶剂和低离子配对盐，抑制多硫化物穿梭，提出。该体系在稍微升高的温度下表现为少量溶剂化的电解质，其中当与锂金属阳极配对时，其在宽范围的电流密度（分别为2C-C/5）内维持高达1200-1500 mAh g-1的可逆容量，在不存在LiNO 3添加剂的情况下具有> 99.7%的库仑效率。
The step-change in gravimetric energy density needed for electrochemical energy storage devices to power unmanned autonomous vehicles, electric vehicles, and enable low-cost clean grid storage is unlikely to be provided by conventional lithium ion batteries. Lithium-sulfur batteries comprising lightweight elements provide a promising alternative, but the associated polysulfide shuttle in typical ether-based electrolytes generates loss in capacity and low coulombic efficiency. The first new electrolyte based on a unique combination of a relatively hydrophobic sulfonamide solvent and a low ion-pairing salt, which inhibits the polysulfide shuttle, is presented. This system behaves as a sparingly solvating electrolyte at slightly elevated temperatures, where it sustains reversible capacities as high as 1200-1500 mAh g-1 over a wide range of current density (2C-C/5, respectively) when paired with a lithium metal anode, with a coulombic efficiency of >99.7 % in the absence of LiNO3 additive.