Silica-Derived Hydrophobic Colloidal Nano-Si for Lithium-Ion Batteries

Release time:2020-05-23

Impact Factor:15.149

DOI number:10.1021/acsnano.7b02021

Affiliation of Author(s):Peking Univ

Journal:ACS Nano

Abstract:Silica can be converted to silicon by magnesium reduction. Here, this classical reaction is renovated for more efficient preparation of silicon nano particles (nano-Si). By reducing the particle size of the starting materials, the reaction can be completed within 10 min by mechanical milling at ambient temperature. The obtained nano-Si with high surface reactivity are directly reacted with 1-pentanol to form an alkoxyl-functionalized hydrophobic colloid, which significantly simplifies the separation process and minimizes the loss of small Si particles. Nano-Si in 5 g scale can be obtained in one single batch with laboratory scale setups with very high yield of 89%. Utilizing the excellent dispersion in ethanol of the alkoxyl-functionalized nano-Si, surface carbon coating can be readily achieved by using ethanol soluble oligomeric phenolic resin as the precursor. The nano-Si after carbon coating exhibit excellent lithium storage performance comparable to the state of the art Si-based anode materials, featured for the high reversible capacity of 1756 mAh.g(-1) after 500 cycles at a current density of 2.1 A.g(-1). The preparation approach will effectively promote the development of nano-Si-based anode materials for lithium-ion batteries.

Co-author:Cong, Xiuqi, Wu, Xinyao, Zheng, Haidong, Ju, Wei, Li, Teng, Wang, Xinghua, Chang

First Author:Zhiliang, Liu

Indexed by:Journal paper

Correspondence Author:Xingguo, Li, Jie, Zheng

First-Level Discipline:0805 材料科学与工程

Document Type:J

Translation or Not:no

Date of Publication:2017-06-01