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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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High-Performance Sheet-Type Sulfide All-Solid-State Batteries Enabled by Dual-Function Li_4.4Si Alloy-Modified Nano

Shenghao Jing¹, Yang Lu¹, Yuting Huang²

¹School of Metallurgy and Environment, Central South University, Changsha, 410083, China.

Advanced Materials (Deerfield Beach, Fla.)

|August 27, 2024

Summary

This study developed a novel dual-function modified nano silicon anode for all-solid-state batteries. This innovation significantly improves cycle stability and energy density in sulfide ASSBs, enabling scalable applications.

Keywords:

Li‐Si alloy nano silicon (nSi) anode prelithiation sheet‐type electrodes sulfide all‐solid‐state batteries (ASSBs)

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Published on: March 7, 2018

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Silicon-based anodes are crucial for high energy density in all-solid-state batteries (ASSBs).
Nano silicon (nSi) is suitable for sulfide ASSBs but suffers from rapid capacity degradation.
Stabilizing the nSi anode structure and improving ion conductivity are key challenges.

Purpose of the Study:

To develop a stable and high-performance anode for sheet-type sulfide ASSBs.
To enhance the cycle stability and energy density of nSi anodes.
To enable scalable fabrication of advanced ASSBs.

Main Methods:

Fabrication of dual-function Li4.4Si modified nSi anode sheets.
Assembly of sheet-type ASSBs using Li4.4Si-modified nSi anodes, Li6PS5Cl (LPSC) membranes, and NCM811 cathodes.
Electrochemical testing including cycling stability and energy density measurements.

Main Results:

The Li4.4Si modified nSi anode demonstrated excellent structural stabilization and provided additional Li+.
ASSBs achieved 96.16% capacity retention after 100 cycles at 0.5 C and maintained stability for 400 cycles.
A cell-level energy density of 303.9 Wh kg-1 was achieved at a high loading of 5.22 mAh cm-2.

Conclusions:

Dual-function Li4.4Si modification effectively addresses the capacity degradation of nSi anodes in sulfide ASSBs.
The developed anode material and fabrication process are promising for scalable, high-performance ASSB applications.
This work represents a significant advancement in room-temperature sulfide ASSBs using electrolyte membranes.