张亮教授课题组在Adv. Funct. Mater.上发表论文

作者：

Lei Wang¹, Hongtai   Li¹, Zhiwei Lu¹, Cheng Yuan¹, Tianran Yan¹,   Tong Chen¹, Chen Cheng¹, Zheng Zhou¹, Liang   Zhang^1,2*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM)Soochow   UniversitySuzhou 215123, China.

²Jiangsu Key   Laboratory of Advanced Negative Carbon Technologies, Soochow University,   Suzhou 215123, China.

摘要：

Efficient   bidirectional conversion of lithium sulfide (Li₂S) is of paramount importance for constructing   high-energy-density lithium–sulfur (Li–S) batteries, but the sluggish   reaction kinetics stemming from its intrinsic insulation and anisotropically   planar proliferation remains a formidable challenge. Herein, a   crystallographic regulation strategy is demonstrated for bidirectional Li₂S conversion, striving to optimize the reaction kinetics   and improve the active sulfur utilization. Specifically, by leveraging the   tunable geometric structures of spinel oxides, Li-rich Li_1.2Mn_1.8O₄ is elaborately designed as an effective   electrocatalyst for Li–S batteries. The pertinently incorporated Li atoms at   octahedral Mn sites endow Li_1.2Mn_1.8O₄ with disordered geometric and electronic   arrangements, leading to a relatively mismatched geometric coherence with   sulfur species and thus driving the precipitation of amorphous Li₂S instead of crystalline counterpart. The pre-formed   amorphous Li₂S nucleus   regulators are beneficial to their isotropically epitaxial growth and   interfacial charge and mass transfer, achieving splendid bidirectional   conversion kinetics of Li₂S. Accordingly, the assembled Ah-level Li–S pouch cell   delivers a prominent specific energy of 309 Wh kg_total⁻¹ at 0.2 C and a remarkable capacity retention of 98.3%   after 30 cycles. The proposed strategy surmounts the intrinsic limitations of   crystalline Li₂S and pilots an   innovative electrocatalyst design avenue for practical Li–S batteries.

影响因子：

19.0

分区情况：

一区

链接：

https://advanced.onlinelibrary.wiley.com/doi/10.1002/adfm.202517003