材料科学
石墨烯
法拉第效率
阳极
纳米颗粒
纳米技术
氧化物
涂层
化学工程
阴极
硅
光电子学
化学
电气工程
工程类
物理化学
冶金
电极
作者
Yanpeng Wang,Hongguang Fan,Lichong Bai,Jinyue Song,Yongcheng Jin,Shuang Liu,Wansu Zheng,Xiaohui Xie,Wei Liu
标识
DOI:10.1016/j.cej.2022.139586
摘要
As attractive anode materials of lithium-ion batteries, both microsized and nanosized silicon particles have been investigated widely, but each has lots of insurmountable problems to restrict their practical applications. In this work, combining the advantages of microsized and nanosized Si particles, we reported a new thought for constructing micrometer-sized Si/C particles by embedding Si nanoparticles into graphene oxide (GO)-based mirorolls. Differing to the traditional spherical shape, the resulted Si/C microrolls exhibit a unique elastic coil structure with opening ends, facilitating the stress buffer and fast charge diffusion. Besides, in order to maintain the stability of Si nanoparticles in microrolls, we chose the elastic and deformable liquid metal (LM) as the “cloth”, and sodium alginate (SA) as the “thread”, successfully tailor a novel “tight suit” for each Si nanoparticle by a facile self-assembly process. Thanks to the double protection of the conductive-elastic LM-SA coating and the microroll architecture, the resulted [email protected]@GO microroll anode not only has a high Si content of 69 %, a high tap density of 0.62 g cm−3 and a high initial coulombic efficiency of 85.1 %, but also exhibits a superior volumetric capacity of 2506 mAh cm−3, and a superior cycling performance of 660 mAh cm−3 after 500 cycles at 2 A g−1. The full cell constructed using a LiNiCoMnO2 cathode can achieve a high reversible capacity of 150 mAh g−1 at 1C after 250 cycles, delivering a high-energy density of 510 Wh kg−1.
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