Indexed by: Journal paper
Journal: Rare Met.
Included Journals: SCI
Affiliation of Author(s): 华中科技大学
Discipline: Engineering
First-Level Discipline: Material Science and Engineering
Document Type: J
Volume: 41
Issue: 12
Page Number: 4065-4074
Key Words: Lithium argyrodite; Chlorine-rich; All-solid-state Li–Se batteries; Operating temperatures; Long cycling performances
DOI number: 10.1007/s12598-022-02093-z
Date of Publication: 2022-09-01
Impact Factor: 6.318
Teaching and Research Group: 电力系
Abstract: All-solid-state Li–Se battery shows great potential as a candidate for next-generation energy storage devices due to their high energy density and safety. However, the low ionic conductivity of the solid electrolytes and large volume changes of Se active materials are two of the major issues that limit its applications. Herein, a simple solid-state reaction method is applied to synthesize chlorine- rich argyrodite Li5.5PS4.5Cl1.5 electrolyte with a high conductivity of 6.25 mScm-1 at room temperature. Carbon nanotube (CNT) is introduced as the host for Se to obtain Se/CNT composite with both enhanced electronic conductivity and lower volume expansion during the electrochemical reaction process. All-solid-state Li–Se battery using Li5.5PS4.5Cl1.5 as a solid electrolyte combined with Se/CNT cathode and Li-In anode shows a discharge capacity of 866 mAhg-1 for the 2nd cycle under 0.433 mAcm-2 at room temperature. Moreover, the assembled battery delivers a high discharge capacity of 1026 mAhg-1 for the 2nd cycle when cycled at the same current density at 60 C and maintains a discharge capacity of 380 mAhg-1 after 150 cycles. Owing to the high Li-ion the conductivity of Li5.5PS4.5Cl1.5 electrolyte, the assembled battery displays a high discharge capacity of 344 mAhg-1 under 0.113 mAcm-2 at - 20 C and remains 66.1% after 200 cycles. In addition, this all-solid-state Li–Se battery shows ultralong cycling performances up to 1000 cycles under 0.433 mAcm-2 at - 20 C. This work offers the design clue to fabricate the all-solid-state Li–Se battery workable at different operating temperatures with an ultralong cycling life.