title: Interface chemistry engineering of protein-directed SnO₂ nanocrystal-based anode for lithium-ion batteries with improved performance.
abstract: A novel uniform amorphous carbon-coated SnO2 nanocrystal (NCs) for use in lithium-ion batteries is formed by utilizing bovine serum albumin (BSA) as both the ligand and carbon source. The SnO2 -carbon composite is then coated by a controlled thickness of polydopamine (PD) layer through in situ polymerization of dopamine. The PD-coated SnO2 -carbon composite is finally mixed with polyacrylic acid (PAA) which is used as binder to accomplish a whole anode system. A crosslink reaction is built between PAA and PD through formation of amide bonds to produce a robust network in the anode system. As a result, the designed electrode exhibits improved reversible capacity of 648 mAh/g at a current density of 100 mA/g after 100 cycles, and an enhanced rate performance of 875, 745, 639, and 523 mAh/g at current densities of 50, 100, 250, and 500 mA/g, respectively. FTIR spectra confirm the formation of crosslink reaction and the stability of the robust network during long-term cycling. The great improvement of capacity and rate performance achieved in this anode system is attributed to two stable interfaces built between the active material (SnO2 -carbon composite) and the buffer layer (PD) and between the buffer layer and the binder (PAA), which effectively diminish the volume change of SnO2 during charge/discharge process and provide a stable matrix for active materials.
authors.affiliation: Key Laboratory of Synthesis and Natural Functional Molecular Chemistry (Ministry of Education), College of Chemistry & Materials Science Northwest University, Xi'an, Shaanxi, 710069, China; i-LAB and Nano-bionics Division Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Dong
authors.forename: Fengxing
authors.initials: F
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Jin
mesh_terms: D000180:Acrylic Resins; D000818:Animals; D002244:Carbon / Q000737:chemistry; D002417:Cattle; D003432:Cross-Linking Reagents / Q000737:chemistry; D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D007211:Indoles / Q000737:chemistry; D007477:Ions; D008094:Lithium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D009584:Nitrogen / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013314:Stress, Mechanical; D013818:Thermogravimetry; D017971:Tin Compounds / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D003432:Cross-Linking Reagents; D007211:Indoles; D007477:Ions; D011108:Polymers; D017971:Tin Compounds; C568283:polydopamine; D012710:Serum Albumin, Bovine; C006903:carbopol 940; D002244:Carbon; D008094:Lithium; C045358:stannic oxide; D009584:Nitrogen
keywords: SnO2 nanocrystals; interfaces; lithium-ion battery