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Net-like Al-Si Anode Integrating Structural Anchoring with Built-In 3D Ion Channels for High-Power-Density
Fayang Guan1, Yixin Xu2, Bing Cheng3
1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing100084, China.
ACS Applied Materials & Interfaces
|August 11, 2026
Summary
Engineered aluminum-silicon anodes with a net-like structure significantly reduce volume expansion in all-solid-state lithium batteries (ASSLBs). This innovation improves cycling stability and power density for next-generation ASSLBs.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Aluminum (Al) is a promising anode material for all-solid-state lithium batteries (ASSLBs) due to its high capacity and low cost.
- Challenges include significant volume expansion, uneven lithiation, and interfacial degradation during battery operation.
- Developing stable and high-performance Al-based anodes is crucial for advancing ASSLB technology.
Purpose of the Study:
- To engineer a novel anode structure that mitigates volume expansion and enhances electrochemical performance in Al-based ASSLBs.
- To investigate the role of eutectic composition engineering and pre-lithiation in creating a stable anode architecture.
- To demonstrate the feasibility of this approach for high-performance, next-generation ASSLBs.
Main Methods:
- Synthesized a net-like "expansion anchor" structure in an Al88Si12-10%Li anode.
- Utilized eutectic composition engineering and a targeted pre-lithiation strategy.
- Characterized the anode structure and electrochemical performance, including volume expansion, cycling stability, and rate capability.
Main Results:
- Achieved a nanoscale lithium-silicon expanded network that accommodates volume changes.
- Reduced electrode expansion from 45.5% to 14.7% without particle pulverization.
- Demonstrated exceptional rate capability (up to 10C) and stable cycling (500 cycles at 6C with 75.6% retention).
- Achieved high areal loading performance (over 4 mA h·cm-2) and power density (1200 W·kg-1).
Conclusions:
- The designed "expansion anchor" structure effectively addresses volume expansion and interfacial degradation in Al anodes.
- This microstructural engineering approach offers a scalable pathway for developing high-performance alloy anodes for ASSLBs.
- The study highlights a promising strategy for realizing the potential of Al-based anodes in next-generation energy storage devices.
