To conquer inherently low conductivity,volume swelling,and labile solid electrolyte inter-phase(SEI)films of Si anode in lith-ium ion battery(LIBs),it is widely ac-cepted that appropriate structure de-sign of Si-C hybrids performs effec-tively,especially for nanosize Si particles.Herein,inspired by the sturdy construction of high-rise buildings,a mansion-like 3D structured Si@SiO2/PBC/RGO(SSPBG)with separated rooms is developed based on 0D core-shell Si@SiO2,1D pyrolytic bacterial cellulose(PBC)and 2D reduced graphene oxide(RGO).Therefore,these hierarchical protectors operate synergistically to inhibit the inevitable volume changes during electrochemical process.Specifically,tightly coated SiO2 shell as the first protective layer could buffer the volume expansion and reduce detrimental pulverization of Si NPs.Furthermore,flexible spring-like PBC and ultra-fine RGO sheets perform as securer barriers and skeleton which will counteract the microstructure strain and accelerate electron transfer at the same time.Remarkably,the self-supporting electrode realizes a distinguished performance of 901 mAh g-1 at 2 A g-1 for 500 cycles.When matched with LiFePO4 cathodes,high stability of more than 100 cycles has been realized for the full batteries.

Deqing Zhang;Junfeng Ren;Caixia Li;Bin Luo;Lei Wang;Yanyan Li

State Key Laboratory Base of Eco-chemical Engineering,Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and Technology,Qingdao University of Science and Technology,Qingdao 266042,China;College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;College of Environment and Safety Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;Nanomaterials Centre,School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology,The University of Queensland,St Lucia,QLD 4072,Australia

结构化学

[1]Deqing Zhang;Junfeng Ren;Caixia Li;Bin Luo;Lei Wang;Yanyan Li-.An Advanced Design Concept of Mansion-like Freestanding Silicon Anodes with Improved Lithium Storage Performances)[J].结构化学,2022(05):55-62

Mansion,lith,nanosize,mansion,SSPBG,protectors,securer

Advanced,Design,Concept,like,Freestanding,Silicon,Anodes,Improved,Lithium,Storage,Performances,To,conquer,inherently,low,conductivity,volume,swelling,labile,solid,electrolyte,inter,phase,SEI,films,anode,battery,LIBs,widely,cepted,that,appropriate,hybrids,performs,effec,tively,especially,particles,Herein,inspired,by,sturdy,construction,high,rise,buildings,structured,SiO2,PBC,RGO,separated,rooms,developed,0D,core,shell,1D,pyrolytic,bacterial,cellulose,2D,reduced,graphene,oxide,Therefore,these,hierarchical,operate,synergistically,inhibit,inevitable,changes,during,electrochemical,process,Specifically,tightly,coated,first,protective,layer,could,buffer,expansion,detrimental,pulverization,NPs,Furthermore,flexible,spring,ultra,fine,sheets,barriers,skeleton,which,will,counteract,microstructure,strain,accelerate,electron,transfer,same,Remarkably,self,supporting,electrode,realizes,distinguished,performance,mAh,cycles,When,matched,LiFePO4,cathodes,stability,than,been,realized,full,batteries

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