Open AccessCopper Indium Sulfide Enables Li‐CO 2 Batteries with Boosted Reaction Kinetics and Cycling Stability
Author(s) -
Chen Lin,
Zhou Jingwen,
Zhang Junxiang,
Qi Guicai,
Wang Bin,
Cheng Jianli
Publication year - 2023
Publication title -
energy and environmental materials
Language(s) - English
Resource type - Journals
ISSN - 2575-0356
DOI - 10.1002/eem2.12415
Subject(s) - bimetallic strip , sulfide , cathode , materials science , indium , energy storage , copper sulfide , chemical engineering , nanotechnology , copper , chemistry , metal , optoelectronics , metallurgy , power (physics) , physics , quantum mechanics , engineering
High energy density Li‐CO 2 batteries have attracted much attention owing to the “two birds with one stone” feature in fixing greenhouse gas CO 2 and providing renewable energy. However, poor reversibility of the discharge product Li 2 CO 3 is one of the main problems that limit its application, resulting in poor cycling stability and severe polarization. Herein, copper indium sulfide (CIS), a semiconducting non‐precious metal sulfide, is fabricated as cathode catalysts for high‐performance Li‐CO 2 batteries. Combined with the synergistic effect of bimetallic valence bonding and coordinated electron transfer, Li‐CO 2 batteries using CIS cathodes exhibit high full specific discharge capacity, excellent rate capability and cycle stability, namely it delivers a high specific full discharge capacity of 8878 μAh cm −2 , runs steadily from 10 to 100 μA cm −2 , and performs a stable long‐term cycling behavior (>1050 h) under a high energy efficiency of 84% and a low charge voltage of approximately 3.4 V at 20 μA cm −2 within 100 μAh cm −2 . In addition, a flexible Li‐CO 2 pouch cell is constructed to reveal the potential of employing CIS to fabricate flexible high energy storage devices in practical applications. This work shows a promising development pathway toward next‐generation sustainable energy storage devices.