In:
Advanced Energy Materials, Wiley, Vol. 10, No. 41 ( 2020-11)
Abstract:
Copper sulfide (CuS) is an attractive electrode material for batteries, thanks to its intrinsic mixed conductivity, ductility and high theoretical specific capacity of 560 mAh g −1 . Here, CuS is studied as cathode material in lithium solid‐state batteries with an areal loading of 8.9 mg cm −2 that theoretically corresponds to 4.9 mAh cm −2 . The configuration of the cell is LiLi 3 PS 4 [CuS (70 wt%) + Li 3 PS 4 (30 wt%)]. No conductive additive is used. CuS undergoes a displacement reaction with lithium, leading to macroscopic phase separation between the discharge products Cu and Li 2 S. In particular, Cu forms a network of micrometer‐sized, well‐crystallized particles that seems to percolate through the electrode. The formed copper is visible to the naked eye. The initial specific discharge capacity at 0.1 C is 498 mAh g(CuS) −1 , i.e., 84% of its theoretical value. The initial Coulomb efficiency (ICE) reaches 95%, which is higher compared to standard carbonate‐based liquid electrolytes for the same cell chemistry (≈70%). After 100 cycles, the specific capacity reaches 310 mAh g(CuS) −1 . With the current composition, the cell provides 58.2 Wh kg −1 at a power density of 7 W kg −1 , which is superior compared to other transition metal sulfide cathodes.
Type of Medium:
Online Resource
ISSN:
1614-6832
,
1614-6840
DOI:
10.1002/aenm.202002394
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2594556-7