Nanosized Si particles with rich surface organic functional groups as high-performance Li-battery anodes

TY - JOUR

T1 - Nanosized Si particles with rich surface organic functional groups as high-performance Li-battery anodes

AU - Ren, Wenfeng

AU - Wang, Yanhong

AU - Tan, Qiangqiang

AU - Yu, Jing

AU - Etim, Ubong Jerom

AU - Zhong, Ziyi

AU - Su, Fabing

N1 - Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/10/10

Y1 - 2019/10/10

N2 - Nanostructured Si is a very promising anode material for lithium-ion batteries as Si possesses a theoretical specific capacity almost ten times higher than that of the conventional graphite anodes. However, difficulties associated with a low-cost and scalable production and unstable electrode/electrolyte interface of nanostructured Si limit their practical application. Herein, an improved route is developed for preparation of crystalline Si nanoparticles by directly reacting metallurgical-grade Si with ethanol catalyzed by Cu-based catalysts at 200 °C to generate alkoxysilane and Si nanostructures and the latter were ball-milled to obtain the desired Si nanoparticles. The particle size of the crystalline Si nanoparticles could be well tuned by adjusting the reaction time and the amount of ethanol. Furthermore, the surfaces of obtained Si nanoparticles were in situ modified by organic functional groups (R–CH2-OH, R–COOH, etc.), confirmed by FTIR and 1H solid-state NMR, which reacted with lithium in the 1st lithiation to form a stable artificial solid electrolyte interphase layer. As tested, the pristine Si nanoparticles exhibited both high reversible capacity and good cycle life even close to that of the carbon-coated Si nanoparticles. Ultimately, this route is cost-effective for scalable manufacture of Si nanoparticles with in situ functionalized surface that can facilitate formation of stable solid electrolyte interphase layer.

AB - Nanostructured Si is a very promising anode material for lithium-ion batteries as Si possesses a theoretical specific capacity almost ten times higher than that of the conventional graphite anodes. However, difficulties associated with a low-cost and scalable production and unstable electrode/electrolyte interface of nanostructured Si limit their practical application. Herein, an improved route is developed for preparation of crystalline Si nanoparticles by directly reacting metallurgical-grade Si with ethanol catalyzed by Cu-based catalysts at 200 °C to generate alkoxysilane and Si nanostructures and the latter were ball-milled to obtain the desired Si nanoparticles. The particle size of the crystalline Si nanoparticles could be well tuned by adjusting the reaction time and the amount of ethanol. Furthermore, the surfaces of obtained Si nanoparticles were in situ modified by organic functional groups (R–CH2-OH, R–COOH, etc.), confirmed by FTIR and 1H solid-state NMR, which reacted with lithium in the 1st lithiation to form a stable artificial solid electrolyte interphase layer. As tested, the pristine Si nanoparticles exhibited both high reversible capacity and good cycle life even close to that of the carbon-coated Si nanoparticles. Ultimately, this route is cost-effective for scalable manufacture of Si nanoparticles with in situ functionalized surface that can facilitate formation of stable solid electrolyte interphase layer.

KW - Anode materials

KW - Artificial solid electrolyte interphase

KW - Lithium ion batteries

KW - Organic functional groups

KW - Silicon nanoparticles

UR - http://www.scopus.com/inward/record.url?scp=85073703765&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2019.134625

DO - 10.1016/j.electacta.2019.134625

M3 - 文章

AN - SCOPUS:85073703765

SN - 0013-4686

VL - 320

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 134625

ER -