标题: Refreshing the liquid-gas reaction interface to provoke the zincothermic reduction of SiCl4 to prepare lithium-storage nano silicon

作者: Cai, MY (Cai, Muya); Zhao, ZQ (Zhao, Zhuqing); Qu, X (Qu, Xin); Qu, JK (Qu, Jiakang); Hu, ZJ (Hu, Zuojun); Shi, H (Shi, Hao); Gao, SB (Gao, Shuaibo); Wang, DH (Wang, Dihua); Yin, HY (Yin, Huayi)

来源出版物: ENERGY STORAGE MATERIALS卷: 57页: 568-576 DOI: 10.1016/j.ensm.2023.03.006提前访问日期: MAR 2023出版年: MAR 2023

摘要: Many heterogeneous reduction reactions are hampered by the generated intermediate products located at the interface of reactants, resulting in reducing the reaction area or slowing down the mass transfer and thereby shutting off or slowing down the reaction. Thus, removing the unwanted intermediate products from the reaction interface is key to enabling a rapid and sufficient reduction rate and rationally mediating the product sizes and structures. Herein, we employ solid NaCl to absorb the intermediate molten ZnCl2 generated at the liquid Zn-SiCl4 gas interface, making the reaction happen continuously and sufficiently at a relatively low temperature of below 450 degrees C. In addition to refreshing the reaction interface, NaCl acts as a buffer to absorb the reaction heat, ensuring the production of hollow Si inherited from the spherical liquid Zn template. As a result, the yield of Si reaches over 95% within 2 h and the Si particle size is below 200 nm. Further, the obtained Si anode has an initial Coulombic efficiency of 86.7% and delivers a capacity of 1580 mAh g- 1 at 3 A g- 1 after 350 cycles with a ca-pacity retention of 90.6%. Overall, this paper provides an effective strategy for engineering the reaction interface and revalorizing waste SiCl4 for making Li-storage Si anodes.

作者关键词: Zincothermic reduction; Nano Si; Liquid-gas reaction interface; SiCl4 recycling; Lithium-storage anode

地址: [Cai, Muya; Qu, Xin; Hu, Zuojun; Shi, Hao; Gao, Shuaibo; Wang, Dihua; Yin, Huayi] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

[Wang, Dihua; Yin, Huayi] Wuhan Univ, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

[Zhao, Zhuqing; Qu, Jiakang; Yin, Huayi] Northeastern Univ, Sch Met, Key Lab Ecol Met Multimet Mineral, Minist Educ, 11 Wenhua Rd, Shenyang 110819, Peoples R China.

通讯作者地址: Yin, HY (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Wuhan Univ, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

Yin, HY (通讯作者)，Northeastern Univ, Sch Met, Key Lab Ecol Met Multimet Mineral, Minist Educ, 11 Wenhua Rd, Shenyang 110819, Peoples R China.

电子邮件地址:yinhuayi@whu.edu.cn

影响因子：20.831