Lead-Free Double Perovskite Cs<sub>2</sub>NaErCl<sub>6</sub>: Li<sup>+</sup> as High-Stability Anodes for Li-Ion Batteries
Shuai Yang, Qimei Liang, Hao Wu, Jiacheng Pi, Zilin Wang, Yuxu Luo, Ying Liu, Zhangwen Long, Dacheng Zhou, Yugeng Wen, Qi Wang, Junming Guo, Jianbei Qiu
Abstract
Halide perovskite materials have been used in the field of lithium-ion batteries because of their excellent ion migration characteristics and defect tolerance. However, the current lead-based perovskites used for lithium-ion batteries are highly toxic, which may hinder the pace of further commercialization. Therefore, it is still necessary to develop a new type of stable and pollution-free perovskite anode material. Herein, we for the first time use a high-concentration lithium-ion doped rare-earth-based double perovskite Cs2NaErCl6:Li+ as the negative electrode material for a lithium-ion battery. Thanks to its excellent structure stability, the assembled battery also has high cycle stability, with a specific capacity of 120 mAh g–1 at 300 mA g–1 after 500 cycles with a Coulomb efficiency of nearly 100%. The introduction of a rare earth element in a lead-free double perovskite paves a new way for the development of novel promising anode materials in the field of lithium storage applications.