Mixed Molten Salt Core-Shell Si@C Anode

High capacity over wide temperature

In-situ formed uniform core-shell architecture via ternary eutectic molten salt, enhancing long-term cycling stability.

Xiaoyan, Cui · Yida, Wang · Renwei, Liao · Yun, Xia · Jie, Li · Junjie, Li · Wenrui, Hu · Zhenjia, Xu · Zhou, Haiyun · Wang, Yanqing · Shang, Qianqian · Chen, Jianqiang

Journal of Energy Storage 2026

Specifications

Coulombic efficiency (2nd cycle)

{'zh': '88.9', 'en': '88.9'} %

Reversible capacity

{'zh': '800', 'en': '800'} mAh g−1

Reversible capacity

{'zh': '466.01', 'en': '466.01'} mAh g−1

Advantages

Low-temperature synthesis

The formation of a low eutectic system among the ternary molten salts enables the reaction to proceed smoothly at low temperatures.

Uniform carbon coating

The product exhibits a uniform particle size of approximately 50nm and a thin, dense carbon layer, which is more favorable for the formation of a core–shell silicon–carbon structure and effectively enhances its structural stability.

Enhanced Si-C synergy

Molecular dynamics simulations show the CaH2-mixed molten salts system enhances silicon-carbon synergy and system fluidity.

Applications

• High-energy lithium-ion batteries：High-capacity Si@C anode boosts energy density for long-range batteries.
• Long-cycle energy storage devices：Long-term cycling stability ensures capacity retention over thousands of cycles in energy storage.
• Flexible batteries：Thin dense carbon layer provides mechanical flexibility for bending.
• Silicon-based solid-state batteries：Uniform core-shell structure mitigates Si expansion, improving interface stability with solid electrolytes.