Highly Efficient Aligned Ion-Conducting Network and Interface Chemistries for Depolarized All-Solid-State Lithium...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state lithium-metal batteries (ASSLMBs) face challenges in long-term cycling stability and energy density due to interfacial issues.
• Current 2D solid electrolytes exhibit limited interfacial contact, leading to unstable interfaces and sluggish ion transport.

Purpose of the Study:

• To develop 3D architecturally designed composite solid electrolytes for ASSLMBs.
• To improve solid-solid interfacial contact and accelerate ion transport for enhanced battery performance.

Main Methods:

• Utilized 3D printing and post-curing to create composite solid electrolytes with controlled structural factors.
• Designed vertical-aligned micro-pillar (p-3DSE) and spiral (s-3DSE) structures for electrolyte films.
• Evaluated electrolyte performance in both Li metal anode and cathode applications.

Main Results:

• The printed p-3DSE demonstrated exceptional long-term cycling stability (up to 2600 cycles) and high critical current density (1.92 mA cm⁻²).
• Achieved superior full-cell areal capacities of 2.75 mAh cm⁻² (LFP) and 3.92 mAh cm⁻² (NCM811).
• The 3D structures effectively alleviated interfacial degradation caused by dendrite growth and contact loss.

Conclusions:

• The developed 3D composite solid electrolytes offer a novel design strategy for advanced ASSLMBs.
• This approach enhances both anode and cathode performance for high-rate/capacity room-temperature operation.
• The study paves the way for more stable and energy-dense solid-state batteries.