High-performance nickel manganese ferrite/oxidized graphene composites as flexible and binder-free anodes for Li-ion batteries
High-performance nickel manganese ferrite/oxidized graphene composites as flexible and binder-free anodes for Li-ion batteries
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DOI：
10.1039/c5ra03556b
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发表时间：
2015-04
期刊：
影响因子：
3.9
通讯作者：
Zailei Zhang;Qiangqiang Tan;Z. Zhong;F. Su
中科院分区：
文献类型：
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作者：
Zailei Zhang;Qiangqiang Tan;Z. Zhong;F. Su
这项工作展示了一种新的方法，用于制造混合金属氧化物/氧化石墨烯（OGP）复合材料作为柔性和无粘合剂的锂离子电池负极材料。采用溶剂热法制备了在OGP网络结构上生长的Ni0.5Mn0.5Fe2O4（NMFO）纳米粒子复合材料。以Ni（CH 3COO）2、Mn（CH 3COO）2和FeCl 3为金属前驱体，以CH 3COONa、HOCH 2CH 2 OH和蒸馏水为混合溶剂，合成了一种新型的纳米晶。采用真空抽滤法将OGP和NMFO/OGP涂覆在聚丙烯微孔膜上制备了柔性无粘结剂电极。NMFO/OGP膜的多层和多孔结构在电极材料和集流体（OGP膜）之间产生良好的接触，这对于柔性器件是必不可少的。如所预期的，自支撑的NMFO/OGP膜和涂覆在聚丙烯微孔膜上的NMFO/OGP两者在不使用任何粘合剂的情况下均表现出超柔性性质。所得柔性无粘合剂电极表现出良好的电化学性能，具有高锂储存容量和优异的循环稳定性。该研究为制备柔性无粘结剂锂离子电池负极材料开辟了新的途径。
This work demonstrates a new method for fabrication of mixed metal oxide/oxidized graphene (OGP) composites as flexible and binder-free anode materials for Li-ion batteries. The composites containing nickel manganese ferrite (Ni0.5Mn0.5Fe2O4 (NMFO)) nanoparticles grown on an OGP network structure are fabricated by a facile solvothermal method. In the synthesis, Ni(CH3COO)2, Mn(CH3COO)2, and FeCl3 are used as the metal precursors; CH3COONa, HOCH2CH2OH and distilled water as the mixed solvent. The flexible and binder-free electrodes are prepared by coating OGP and NMFO/OGP on polypropylene microporous film via vacuum filtration. The multilayer and porous structure of the NMFO/OGP film generate good contact between the electrode materials and the current collector (OGP film), which is essential for flexible devices. As anticipated, both the free-standing NMFO/OGP film and NMFO/OGP coated on polypropylene microporous film exhibit super-flexible properties without using any binder. The obtained flexible and binder-free electrodes show good electrochemical performance with high lithium storage capacity and excellent cycling stability. This work opens a new way for fabrication of flexible and binder-free anode materials for Li-ion batteries.