The energy density of commercial lithium(Li)ion bat-teries with graphite anode is reaching the limit.It is believed that directly utilizing Li metal as anode without a host could enhance the battery's energy density to the maximum extent.However,the poor reversibility and infinite volume change of Li metal hinder the realistic implementation of Li metal in battery community.Herein,a commer-cially viable hybrid Li-ion/metal battery is realized by a coordinated strategy of symbiotic anode and prelithiated cathode.To be specific,a scalable template-removal method is developed to fabricate the porous graphite layer(PGL),which acts as a symbiotic host for Li ion intercalation and subsequent Li metal deposition due to the enhanced lithiophilicity and sufficient ion-conducting pathways.A continuous dissolution-deintercalation mechanism during delithiation process fur-ther ensures the elimination of dead Li.As a result,when the excess plating Li reaches 30％,the PGL could deliver an ultrahigh average Coulombic efficiency of 99.5％for 180 cycles with a capacity of 2.48 mAh cm-2 in traditional carbonate electrolyte.Meanwhile,an air-stable recrystallized lithium oxalate with high specific capacity(514.3 mAh g-1)and moderate operating potential(4.7-5.0 V)is introduced as a sacrificial cathode to compensate the initial loss and provide Li source for subsequent cycles.Based on the prelithiated cathode and initial Li-free symbiotic anode,under a practical-level 3 mAh capacity,the assembled hybrid Li-ion/metal full cell with a P/N ratio(capacity ratio of LiNi0.8Co0.1Mn0.1O2 to graphite)of 1.3 exhibits significantly improved capacity retention after 300 cycles,indicating its great potential for high-energy-density Li batteries.

Kui Lin;Xiaofu Xu;Xianying Qin;Ming Liu;Liang Zhao;Zijin Yang;Qi Liu;Yonghuang Ye;Guohua Chen;Feiyu Kang;Baohua Li

Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Shenzhen 518055,People's Republic of China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,People's Republic of China;Contemporary Amperex Technology Co.Ltd.,Ningde 352100,People's Republic of China;Shenzhen Graphene Innovation Center Co.Ltd.,Shenzhen 518055,People's Republic of China;College of Materials Science and Engineering,Hunan University,Changsha 410082,People's Republic of China;Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,People's Republic of China

纳微快报（英文）

[1]Kui Lin;Xiaofu Xu;Xianying Qin;Ming Liu;Liang Zhao;Zijin Yang;Qi Liu;Yonghuang Ye;Guohua Chen;Feiyu Kang;Baohua Li-.Commercially Viable Hybrid Li-Ion/Metal Batteries with High Energy Density Realized by Symbiotic Anode and Prelithiated Cathode)[J].纳微快报（英文）,2022(09):174-186

Prelithiated,prelithiated,lithiophilicity

Commercially,Viable,Hybrid,Ion,Metal,Batteries,High,Energy,Density,Realized,by,Symbiotic,Anode,Cathode,energy,density,commercial,lithium,graphite,anode,reaching,limit,It,believed,that,directly,utilizing,metal,without,host,could,battery,maximum,extent,However,poor,reversibility,infinite,volume,change,hinder,realistic,implementation,community,Herein,viable,hybrid,realized,coordinated,strategy,symbiotic,cathode,To,specific,scalable,template,removal,method,developed,fabricate,porous,layer,PGL,which,acts,subsequent,deposition,due,enhanced,sufficient,conducting,pathways,continuous,dissolution,deintercalation,mechanism,during,delithiation,process,fur,ther,ensures,elimination,dead,result,when,excess,plating,reaches,deliver,ultrahigh,average,Coulombic,efficiency,cycles,capacity,mAh,traditional,carbonate,electrolyte,Meanwhile,air,stable,recrystallized,oxalate,moderate,operating,potential,introduced,sacrificial,compensate,initial,loss,provide,source,Based,free,under,practical,level,assembled,full,cell,ratio,LiNi0,8Co0,1Mn0,1O2,exhibits,significantly,improved,retention,after,indicating,great,batteries

0.582939