Critical Link between Materials Chemistry and Cell-Level Design for High Energy Density and Low Cost Lithium-Sulfur Transportation Battery
Critical Link between Materials Chemistry and Cell-Level Design for High Energy Density and Low Cost Lithium-Sulfur Transportation Battery
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DOI：
10.1149/2.0611506jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Gallagher, Kevin G.
中科院分区：
文献类型：
--
作者：
Eroglu, Damla;Zavadil, Kevin R.;Gallagher, Kevin G.
提出了锂硫（Li-S）电动汽车电池的材料-系统分析，该分析从材料化学报告中确定了关键电极和电池设计考虑因素。由此产生的系统级能量密度，比能量和电池价格作为这些参数的函数进行预测。阳极处的过量锂金属量和阴极处的可用比容量、电解质体积分数、硫碳比和反应动力学均显示出对于高能量密度和低成本要求是关键的。电极负载被确定为一个关键参数，与电池的价格为可用的能量的研究设计考虑。所提出的分析提出，高于8 mAh/cm（2）（类似于7 mg S/cm（2））的电极负载对于Li-S系统表现出运输应用所需的高能量密度和低成本是必要的。在所需的电流密度和面积容量下稳定锂金属界面，同时在电解质匮乏的阴极中保持高硫负载的电池容量，被认为是正在进行的研究和开发工作要解决的关键障碍。(C)作者（S）2015 All rights reserved.
A materials-to-system analysis for the lithium-sulfur (Li-S) electric vehicle battery is presented that identifies the key electrode and cell design considerations from reports of materials chemistry. The resulting systems-level energy density, specific energy and battery price as a function of these parameters is projected. Excess lithium metal amount at the anode and useable specific capacity, electrolyte volume fraction, sulfur to carbon ratio and reaction kinetics at the cathode are all shown to be critical for the high energy density and low cost requirements. Electrode loading is determined as a key parameter to relate the battery price for useable energy to the investigated design considerations. The presented analysis proposes that electrode loadings higher than 8 mAh/cm(2) (similar to 7 mg S/cm(2)) are necessary for Li-S systems to exhibit the high energy density and low cost required for transportation applications. Stabilizing the interface of lithium metal at the required current densities and areal capacities while simultaneously maintaining cell capacity with high sulfur loading in an electrolyte starved cathode are identified as the key barriers for ongoing research and development efforts to address. (C) The Author(s) 2015. All rights reserved.