Journal article

Publication year: 2020

Pages: 2002394-

Journal: Advanced Energy Materials

Volume number: 10

Issue number: 41

ISSN: 1614-6832

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/aenm.202002394

Publisher: Wiley

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 LiLi3PS4[CuS (70 wt%) + Li3PS4(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 Li2S. 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 (approximate to 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.

Harvard Citation style: Santhosha, A., Nazer, N., Koerver, R., Randau, S., Richter, F., Weber, D., et al. (2020) Macroscopic Displacement Reaction of Copper Sulfide in Lithium Solid-State Batteries, Advanced Energy Materials, 10(41), p. 2002394. https://doi.org/10.1002/aenm.202002394

APA Citation style: Santhosha, A., Nazer, N., Koerver, R., Randau, S., Richter, F., Weber, D., Kulisch, J., Adermann, T., Janek, J., & Adelhelm, P. (2020). Macroscopic Displacement Reaction of Copper Sulfide in Lithium Solid-State Batteries. Advanced Energy Materials. 10(41), 2002394. https://doi.org/10.1002/aenm.202002394