Phase‐Transition Interlayer Enables High‐Performance Solid‐State Sodium Batteries with Sulfide Solid Electrolyte

Abstract

All‐solid‐state sodium (Na) batteries (ASSSBs) using sulfide‐based solid electrolytes (SEs) have attracted intensive attention due to their superior safety, high energy density, and low cost. However, the interfacial issue is one of the biggest challenges to achieve high‐performance sulfide‐based ASSSBs due to the serious reactions between active Na metal and sulfide SEs at the interface. To address the interfacial challenges, a simple and efficient approach by introducing a phase transition polymer electrolyte as an interlayer to stabilize the interface is proposed. Na3SbS4 as a model sulfide SE is used to demonstrate the interlayer strategy to stabilize the interface by preventing the detrimental reactions and inhibiting Na dendrites. As a result, stable Na plating/stripping is observed in Na symmetric cells under the current density of 0.1 mA cm−2. Moreover, ASSSBs with Na metal and TiS2 electrode deliver long‐term stability over 300 cycles remaining a specific capacity above 100 mAh g−1, and FeS2||Na cells exhibit an impressive specific capacity of up to 200 mAh g−1 after the 20th cycles. This study demonstrates an efficient strategy to address interfacial challenges between sulfide SEs and Na metal, which contributes to the development of ASSSBs in next‐generation energy storage systems.

In Situ Directional Polymerization of Poly(1,3‐dioxolane) Solid Electrolyte Induced by Cellulose Paper‐Based Composite Separator for Lithium Metal Batteries

“…AC impedance was measured on an electrochemical workstation (CHI660E, Shanghai Chenhua) in the frequency range from 10 5 to 10 −1 Hz. The ionic conductivity ( σ ) was calculated from the following equation: [ 61 ] where R b is the bulk resistance obtained from Nyquist impedance spectra, and L and A are the thickness and effective area of the electrode, respectively. Linear sweep voltammetry was measured using the CHI660E electrochemical workstation to evaluate the stability of electrolytes.…”

“…AC impedance was measured on an electrochemical workstation (CHI660E, Shanghai Chenhua) in the frequency range from 10 5 to 10 −1 Hz. The ionic conductivity (σ) was calculated from the following equation: [61] Energy Environ. Mater.…”

Highly Conductive Poly(ethylene oxide)-Based Composite Polymer Electrolyte for Sodium Battery Applications

“…2 SSEs can be classified into three major categories: inorganic solid electrolyte (ISE), solid polymer electrolyte (SPE), and composite polymer electrolyte (CPE). 3 Typical ISEs include a Na superionic conductor (NASICON), 4 sulfide-based solid electrolytes (e.g., Na 3 PS 4 , Na 2 S−P 2 S 5 , and Na 3 SbS 4 ), 5 and β-alumina solid electrolytes (BASEs). 6 The problems of these ISEs include insufficient mechanical strength and poor chemical stability or interfacial contacts with electrodes.…”

Approaching Practically Accessible and Environmentally Adaptive Sodium Metal Batteries with High Loading Cathodes through In Situ Interlock Interface

“…[3,4] Practically, the exacerbated interfacial side reactions along Na anode surface in liquid electrolytes could result in the formation of unstable solid electrolyte interphase (SEI) and further lead to uncontrollable Na dendrite growth, potentially triggering safety issues such as short-circuit and thermal runaway. [10][11][12] In contrary, solid-state electrolytes (SSEs) with the extra advantages including leak-free, high thermal stability, and so on are more promising candidates to alleviate the aforementioned concerns associated with liquid electrolytes. [13][14][15] The commonly reported SSEs for sodium batteries mainly include inorganic and organic electrolytes.…”