A combination of hierarchical pore and buffering layer construction for ultrastable nanocluster Si/SiO_(x)anode  

作　　者：Kun Zeng Tong Li Xianying Qin Gemeng Liang Lihan Zhang Qi Liu Baohua Li Feiyu Kang 

机构地区：[1]Shenzhen Key Laboratory of Power Battery Safety Research and Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,518055,China [2]Tsinghua-Berkeley Shenzhen Institute(TBSI),Tsinghua University,Shenzhen,518055,China [3]School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Nano Research》2020年第11期2987-2993,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51872157);Shenzhen Technical Plan Project(Nos.JCYJ20170817161753629 and JCYJ20180508152135822);the Shenzhen Graphene Manufacturing Innovation Center(No.201901161513);Shenzhen Key Lab of Security Research of Power Batteries(No.ZDSYS201707271615073);Guangdong Technical Plan Project(Nos.2015TX01N011 and 2017B090907005);Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(No.2017BT01N111);the Special Fund Project for Strategic Emerging Industry Development of Shenzhen(No.20170428145209110).

摘　　要：Porous Si can be synthesized from diverse silica(SiO_(2))via magnesiothermic reduction technology and widely employed as potential anode material in lithium ion batteries.However,concerns regarding the influence of residual silicon oxide(SiO_(x))component on resulted Si anode after reduction are still lacked.In this work,we intentionally fabricate a cauliflower-like silicon/silicon oxide(CF-Si/SiO_(x))particles from highly porous SiO_(2)spheres through insufficient magnesiothermic reduction,where residual SiO_(x)component and internal space play an important role in preventing the structural deformation of secondary bulk and restraining the expansion of Si phase.Moreover,the hierarchically structured CF-Si/SiO_(x)exhibits uniformly-dispersed channels,which can improve ion transport and accommodate large volume expansion,simultaneously.As a result,the CF-Si/SiO_(x)-700 anode shows excellent electrochemical performance with a specific capacity of^1,400 mA·h·g^(−1)and a capacity retention of 98%after 100 cycles at the current of 0.2 A·g^(−1).

关 键 词：highly-porous Si/SiO_(x)anodes magnesiothermic reduction lithium ion battery 

分 类 号：TB383[一般工业技术—材料科学与工程]