Abstract
The developments of all-solid-state sodium batteries are severely constrained by poor Na-ion transport across incompatible solid-solid interfaces. We demonstrate here a triple NaxMoS2-carbon-BASE nanojunction interface strategy to address this challenge using the β″-Al2O3 solid electrolyte (BASE). Such an interface was constructed by adhering ternary Na electrodes containing 3 wt % MoS2 and 3 wt % carbon on BASE and reducing contact angles of molten Na to ∼45°. The ternary Na electrodes exhibited twice improved elasticity for flexible deformation and intimate solid contact, whereas NaxMoS2 and carbon synergistically provide durable ionic/electronic diffusion paths, which effectively resist premature interface failure due to loss of contact and improved Na stripping utilization to over 90%. Na metal hosted via triple junctions exhibited much smaller charge-transfer resistance and 200 h of stable cycling. The novel interface architecture enabled 1100 mAh/g cycling of all-solid-state Na-S batteries when using advanced sulfur cathodes with Na-ion conductive PEO10-NaFSI binder and NaxMo6S8 redox catalytic mediator.
Original language | English |
---|---|
Pages (from-to) | 6837-6844 |
Number of pages | 8 |
Journal | Nano Letters |
Volume | 20 |
Issue number | 9 |
DOIs | |
State | Published - Sep 9 2020 |
Externally published | Yes |
Funding
This work was supported stationary energy storage program by the U.S. Department of Energy, Office of Electricity through Pacific Northwest National Laboratory (PNNL Project #70247) and by startup grants from Northern Illinois University. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. PNNL is operated by Battelle for DOE under Contract DE-AC05-76RL01830.
Keywords
- interface compatibility
- Na metal batteries
- solid state batteries
- triple junction interface
- β″-AlOsolid electrolyte