Wei Chen1, Tianyu Lei1, Weiqiang Lv1, Yin Hu1, Yichao Yan1, Yu Jiao2, Weidong He1, Zhenghan Li1, Chenglin Yan3,4, Jie Xiong1
1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
2School of Applied and Chemical Engineering Xichang College Xichang 615053 China
3Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
4Soochow Institute for Energy and Materials Innovations, College of Energy, Soochow University, Suzhou 215006 China
Tóm tắt
AbstractFast lithium ion transport with a high current density is critical for thick sulfur cathodes, stemming mainly from the difficulties in creating effective lithium ion pathways in high sulfur content electrodes. To develop a high‐rate cathode for lithium–sulfur (Li–S) batteries, extenuation of the lithium ion diffusion barrier in thick electrodes is potentially straightforward. Here, a phyllosilicate material with a large interlamellar distance is demonstrated in high‐rate cathodes as high sulfur loading. The interlayer space (≈1.396 nm) incorporated into a low lithium ion diffusion barrier (0.155 eV) significantly facilitates lithium ion diffusion within the entire sulfur cathode, and gives rise to remarkable nearly sulfur loading‐independent cell performances. When combined with 80% sulfur contents, the electrodes achieve a high capacity of 865 mAh g−1 at 1 mA cm−2 and a retention of 345 mAh g−1 at a high discharging/charging rate of 15 mA cm−2, with a sulfur loading up to 4 mg. This strategy represents a major advance in high‐rate Li–S batteries via the construction of fast ions transfer paths toward real‐life applications, and contributes to the research community for the fundamental mechanism study of loading‐independent electrode systems.
