Amorphous Titanium Polysulfide Composites with Electronic/Ionic Conduction Networks for All-Solid-State Lithium Batteries

Wentong Fan; Miao Jiang; Gaozhan Liu; Wei Weng; Jing Yang; Xiayin Yao

doi:10.1021/acsami.2c03563

Amorphous Titanium Polysulfide Composites with Electronic/Ionic Conduction Networks for All-Solid-State Lithium Batteries

ACS Appl Mater Interfaces. 2022 Apr 20;14(15):17594-17600. doi: 10.1021/acsami.2c03563. Epub 2022 Apr 7.

Authors

Wentong Fan^{1

2}, Miao Jiang^{1

3}, Gaozhan Liu^{1

3}, Wei Weng^{1

3}, Jing Yang¹, Xiayin Yao^{1

3}

Affiliations

¹ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
² Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, P. R. China.
³ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

PMID: 35389629
DOI: 10.1021/acsami.2c03563

Abstract

All-solid-state lithium/sulfide batteries are considered as next-generation high-energy-density batteries with unrivaled safety. However, sulfide cathodes generally suffer from insulating properties and huge volume expansion in all-solid-state lithium batteries. Based on amorphous TiS₄ (a-TiS₄), a certain proportion of Super P is introduced to suppress the volume expansion and increase the electronic conductivity. Meanwhile, a Li₇P₃S₁₁ solid electrolyte is in situ coated on the surface of 20% Super P/a-TiS₄, and the close interfacial contact between the active material and the solid electrolyte constructs a favorable ionic conduction path. As a result, a Li/75% Li₂S-24% P₂S₅-1% P₂O₅/Li₁₀GeP₂S₁₂/20% Super P/a-TiS₄@Li₇P₃S₁₁ battery shows a high reversible capacity of 507.4 mAh g^-1 after 100 cycles at 0.1 A g^-1. Even the current density increases to 1.0 A g^-1, and it can also provide a reversible capacity of 349.8 mAh g^-1 after 200 cycles. These results demonstrate a promising 20% Super P/a-TiS₄@Li₇P₃S₁₁ cathode material with electronic/ionic conduction networks for all-solid-state lithium batteries.

Keywords: 20 percent Super P/a-TiS4@Li7P3S11 composite; all-solid-state lithium batteries; electronic/ionic conduction network; high loading; interfacial contact.