首页|Constructing high-toughness polyimide binder with robust polarity and ion-conductive mechanisms ensuring long-term operational stability of silicon-based anodes
Constructing high-toughness polyimide binder with robust polarity and ion-conductive mechanisms ensuring long-term operational stability of silicon-based anodes
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
万方数据
Silicon-based materials have demonstrated remarkable potential in high-energy-density batteries owing to their high theoretical capacity.However,the significant volume expansion of silicon seriously hinders its utilization as a lithium-ion anode.Herein,a functionalized high-toughness polyimide(PDMI)is syn-thesized by copolymerizing the 4,4'-Oxydiphthalic anhydride(ODPA)with 4,4'-oxydianiline(ODA),2,3-diaminobenzoic acid(DABA),and 1,3-bis(3-aminopropyl)-tetramethyl disiloxane(DMS).The combi-nation of rigid benzene rings and flexible oxygen groups(-O-)in the PDMI molecular chain via a rigidness/softness coupling mechanism contributes to high toughness.The plentiful polar carboxyl(-COOH)groups establish robust bonding strength.Rapid ionic transport is achieved by incorporating the flexible siloxane segment(Si-O-Si),which imparts high molecular chain motility and augments free volume holes to facilitate lithium-ion transport(9.8×10-10 cm2 s-1 vs.16×10-10 cm2 s-1).As expected,the SiOx@PDMI-1.5 electrode delivers brilliant long-term cycle performance with a remarkable capacity retention of 85％over 500 cycles at 1.3 A g-1.The well-designed functionalized polyimide also signifi-cantly enhances the electrochemical properties of Si nanoparticles electrode.Meanwhile,the assembled SiOx@PDMI-1.5/NCM811 full cell delivers a high retention of 80％after 100 cycles.The perspective of the binder design strategy based on polyimide modification delivers a novel path toward high-capacity elec-trodes for high-energy-density batteries.
China Automotive Battery Research Institute Co.,Ltd.,Beijing 101407,China
Changzhou Institute of Advanced Materials,Beijing University of Chemical Technology,Changzhou 213164,Jiangsu,China
展开 >
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesNatural Science Foundation of Jiangsu Province
NETL
NSTL
万方数据
