Iron Sulfides as High Energy Density Lithium Battery Cathodes

Conversion-type cathodes for lithium metal batteries are considered long-term targets due to their low cost and high energy density. However, they suffer from poor cycling life. In this talk, we present various interface engineering strategies, such as designing topotactic reactions and constructing a 3D ionic-electronic network to overcome this challenge. We demonstrate that micro-sized FeS_x cathode achieves an long cycling life at a high areal capacity (&gt; 4 mAh/cm2) at high current rates. Meanwhile, we also demonstrate Li-FeSx pounch cell prototype with an energy density up to 390 Wh/kg at room temperature without adding external pressure. It reveals the potential of conversion cathodes, even in micro-size, for practical applications.<br/>Related works:<br/><b>Liping Wang</b>, Zhenrui Wu, Jian Zou, Peng Gao, Xiaobin Niu, Hong Li*, Liquan Chen, Li-free cathode materials for high energy density lithium batteries, <i>Joule</i>, 3(2019) 2086-2102. <br/>Zhendong Li, Ge Zhou, Shuai Li, Hongyu Liu, <b>Liping Wang</b>*, Hong Li*,Unlocking cycling longevity in micro-sized conversion-type FeS2 cathodes, <i>Joule</i>, just-accepted, 2023<br/>Jian Zou, Keguo Yuan, Jun Zhao, Bojun Wang, Shiyin Chen, Jianyu Huang, Hong Li*, Xiaobin Niu*, <b>Liping Wang</b>*, Delithiation-Driven Topotactic Reaction Endows Superior Cycling Performances for High-Energy-Density FeS<i>_x</i> (1 ≤ x ≤ 1.14) Cathodes, <i>Energy Storage Materials</i>, 43 (2021) 579–584.<br/>Jian Zou, Jun Zhao, Bojun Wang, Shulin Chen, Pengyu Chen, Qiwen Ran, Li Li, Xin Wang, Jingming Yao, Hong Li, Jianyu Huang*, Xiaobin Niu*, <b>Liping Wang*</b>, Unraveling the Reaction Mechanism of FeS₂ as a Li-ion Battery Cathode, <i>ACS Applied Materials & Interfaces</i>, 2020, 12, 40, 44850-44857.