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Updated: Jul 12, 2026
Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
Unlocking Lewis-Acid Catalysis and Crystalline Polyselenide Evolution for Ultra-Stable Sodium-Ion Batteries
Yijian Zhong1, Weikuan Li1, Zhixin Liang1
1School of Materials and Energy, Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Guangdong University of Technology, Guangzhou, Guangdong, People's Republic of China.
Researchers developed a new copper-tin selenide composite (Cu2SnSe4@NC) for sodium-ion batteries. This material significantly improves cycling stability and lifespan by preventing intermediate dissolution and degradation, enabling sustainable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Metal selenides (MSes) show promise as anodes for sodium-ion batteries (SIBs).
- However, their practical use is limited by poor kinetics, polyselenide dissolution, and structural instability.
- Tin diselenide (SnSe2) anodes suffer from localized electron distribution and high energy barriers, hindering cycling reversibility.
Purpose of the Study:
- To investigate the limitations of SnSe2 anodes in SIBs.
- To design and synthesize a novel composite material for enhanced SIB performance.
- To establish a new strategy for developing long-lasting MSes anodes.
Main Methods:
- Theoretical calculations guided the design of a bimetallic selenide composite (Cu2SnSe4@NC).
- In-situ generation of Cu/Sn heterostructures was utilized.
- Electrochemical performance was evaluated in half-cell and full-cell configurations.
Main Results:
- Copper incorporation in Cu2SnSe4@NC delocalizes electrons and accelerates the initial conversion reaction.
- The Cu/Sn heterostructure facilitates stepwise evolution of sodium polyselenides, suppressing intermediate shuttling.
- The Cu2SnSe4@NC electrode demonstrated excellent cycling stability, retaining 95% capacity after 7000 cycles at 5.0 A g-1 (half-cell) and over 5000 cycles at 1.0 A g-1 (full-cell).
Conclusions:
- The developed Cu2SnSe4@NC composite effectively addresses the challenges of MSes anodes in SIBs.
- This work presents a new design paradigm for ultra-long lifespan MSes anodes for scalable SIB applications.
