A prototype of dual-ion conductor for all-solid-state lithium batteries

Tao Yu; Haoyu Li; Yuankai Liu; Jingchang Li; Jiaming Tian; Zhaoguo Liu; Yuan Rao; Shaohua Guo; Haoshen Zhou

doi:10.1126/sciadv.adj8171

A prototype of dual-ion conductor for all-solid-state lithium batteries

Sci Adv. 2023 Nov 3;9(44):eadj8171. doi: 10.1126/sciadv.adj8171. Epub 2023 Nov 3.

Authors

Tao Yu^{1

2}, Haoyu Li^{1

2}, Yuankai Liu^{1

2}, Jingchang Li^{1

2}, Jiaming Tian^{1

2}, Zhaoguo Liu^{1

2}, Yuan Rao^{1

2}, Shaohua Guo^{1

2}, Haoshen Zhou¹

Affiliations

¹ College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.
² Lab of Power and Energy Storage Batteries, Shenzhen Research Institute of Nanjing University, Shenzhen, 518000, China.

Abstract

All-solid-state batteries (ASSBs) represent a promising battery strategy to achieve high energy density with great safety. However, inadequate kinetic property and poor interfacial compatibility remain great challenges, which impede their practical application. A prototype of dual-ion conductor of Li⁺ synchronized with Cu⁺ unlocks a four-electron redox reaction with high reversibility and fast kinetics. As a result, the constructed ASSB exhibited a high reversible capacity of 603.0 mA·hour g^-1 and an excellent cycling retention of 93.2% over 1500 cycles. Moreover, because of the ion highway connecting active materials and catholytes constructed by dual-ion conductor, remarkable temperature tolerance (-60°C) and excellent rate performance (231.6 mA·hour g^-1 at 20 mA cm^-2) were achieved. The superior electrochemical performance can be ascribed to the migration pathway with small energy barrier and low tortuosity once the Cu⁺ introduced into Li₆PS₅Cl. This work creates a unique perspective of ASSBs with dual-ion conducting strategy, thus inspiring a potential developing strategy of state-of-the-art ASSBs.