Creep Localization Empowering High-Capacity Alloy Anodes for Durable All-Solid-State Lithium Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• High-capacity alloy anodes (Si, Al, Sn) are crucial for high-energy all-solid-state lithium batteries (ASSLBs).
• Severe interfacial stress, volume changes, and high stack pressures limit the practical application of these anodes.

Purpose of the Study:

• To develop a novel strategy to overcome the intrinsic limitations of alloy anodes in ASSLBs.
• To enable stable cycling of ASSLBs at high energy densities and low stack pressures.

Main Methods:

• Implementation of a
• creep localization
• strategy by coupling a creep-susceptible InSnBi alloy anode with a titanium mesh.
• Investigation of the synergistic interface stabilization mechanism involving adaptive creep and flexural rigidity.

Main Results:

• The InSnBi anode exhibits adaptive creep, maintaining ionic-electronic networks.
• The titanium framework effectively redistributes stress, preventing heterogeneous concentrations.
• Stable cycling was achieved at high loading (23.05 mAh cm^-2) and low stack pressure (3 MPa).
• A LiCoO₂||InSnBi full-cell demonstrated 81.6% capacity retention over 3000 cycles at a 2C rate.

Conclusions:

• The hierarchical stress management mechanism effectively accommodates volume fluctuations and stabilizes the interface.
• This work presents a new paradigm for addressing electro-chemo-mechanical degradation in ASSLBs.
• The proposed strategy represents a significant advancement for developing high-energy ASSLBs.