title: Synthesis of micro-nano hierarchical structured LiFePO₄/C composite with both superior high-rate performance and high tap density.
abstract: Efforts were made to synthesize LiFePO(4)/C composites showing both high rate capability and high tap density. First, monoclinic phase FePO(4)·2H(2)O with micro-nano hierarchical structures are synthesized using a hydrothermal method, which are then lithiated to LiFePO(4)/C also with hierarchical structures by a simple rheological phase method. The primary structures of FePO(4)·2H(2)O are nanoplates with ∼30 nm thickness, and the secondary structures of the materials are intertwisted micro-scale rings. The LiFePO(4)/C materials lithiated from these specially structured precursors also have hierarchical structures, showing discharge capacities of more than 120, 110, and 90 mAh g(-1) at rates of 5 C, 10 C and 20 C, respectively, and high tap density of 1.4 g cm(-3) as cathode materials for lithium ion batteries. Since tap density is an important factor that needs to be considered in fabricating real batteries in industry, these hierarchical structured LiFePO(4)/C moves closer to real and large-scale applications.
authors.affiliation: College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Youxiang
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D011211:Electric Power Supplies; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*
chemical_list: C473349:LiFePO4; D010710:Phosphates; D002244:Carbon; D008094:Lithium; D007501:Iron