Ultrathin Lithium Aluminate Nanoflake-Inlaid Sulfur as a Cathode Material for Lithium–Sulfur Batteries with High Areal Capacity,ACS Applied Energy Materials

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Ultrathin Lithium Aluminate Nanoflake-Inlaid Sulfur as a Cathode Material for Lithium–Sulfur Batteries with High Areal Capacity
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-05-14 00:00:00 , DOI: 10.1021/acsaem.0c00597
Arnab Ghosh _{1,

2,

3} , Ajit Kumar _{1,

2,

3} , Amlan Roy ₃ , Cuong Nguyen ₂ , Aakash Ahuja ₃ , Md. Adil ₃ , Manjunath Chatti ₂ , Mega Kar ₂ , Douglas R. MacFarlane ₂ , Sagar Mitra ₃

Affiliation

Direct Utilization of commercial sulfur as a cathode material is ideal for the bulk production of high-energy-density lithium–sulfur (Li–S) batteries. However, due to large ion-diffusion length, commercial sulfur suffers from low practical capacity. To achieve adequate capacity with long-term cyclability using the commercial sulfur-based cathodes, we introduce ultrathin lithium aluminate (LiAlO₂) nanoflakes as polysulfide immobilizers with excellent Li⁺ ion conductivity. The ultrathin LiAlO₂ nanoflake-inlaid sulfur cathode exhibits high areal capacity with extremely stable cycling performance. At a current rate of 0.2C, our cathode delivered a high areal capacity of 4.86 mA h cm^–2 during the first cycle and retains 4.75 mA h cm^–2 after 100 cycles. At a high current rate of 3C, the cathode retains the areal capacity of 2.52 mA h cm^–2 after 500 cycles, with an extremely low capacity decay rate of 0.02% per cycle. In situ Raman spectroscopy studies coupled with the chronoamperometry technique reveal that LiAlO₂ nanoflakes catalyze the redox kinetics in the Li–S batteries. This work shows a promising strategy to directly utilize commercial sulfur powder in practical Li–S batteries.

中文翻译：

超薄铝酸锂纳米片状镶嵌硫作为高容量锂-硫电池的阴极材料

直接使用商业用硫作为正极材料非常适合批量生产高能密度锂硫（Li–S）电池。然而，由于大的离子扩散长度，商业硫的实用能力低。为了使用商业上基于硫的阴极达到足够的容量并具有长期可循环性，我们引入了超薄铝酸锂（LiAlO ₂）纳米薄片作为具有出色Li ⁺离子电导率的聚硫化物固定剂。LiAlO ₂纳米薄片镶嵌的超薄硫阴极显示出高的面容量，并具有极其稳定的循环性能。在0.2C的电流速率下，我们的阴极在第一个循环中提供了4.86 mA h cm ^–2的高面积容量，并保留了4.75 mA h cm100个循环后^–2。在3C的高电流速率下，阴极在500个循环后仍保持2.52 mA h cm ^-2的面积容量，每循环0.02％的极低容量衰减率。原位拉曼光谱研究与计时电流分析技术相结合，揭示了LiAlO ₂纳米薄片催化Li-S电池中的氧化还原动力学。这项工作表明了一种有前景的策略，可以直接在实用的Li-S电池中利用商业化的硫粉。

更新日期：2020-05-14

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