Integrated Fast Assembly of Free-Standing Lithium Titanate/Carbon Nanotube/Cellulose Nanofiber Hybrid Network Film as Flexible Paper-Electrode for Lithium-Ion Batteries
Integrated Fast Assembly of Free-Standing Lithium Titanate/Carbon Nanotube/Cellulose Nanofiber Hybrid Network Film as Flexible Paper-Electrode for Lithium-Ion Batteries
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DOI：
10.1021/acsami.5b02693
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发表时间：
2015-05-27
影响因子：
9.5
通讯作者：
Shi, Liyi
中科院分区：
文献类型：
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作者：
Cao, Shaomei;Feng, Xin;Shi, Liyi
从一次性和可回收器件生产的角度出发，采用压力控制的水相挤出工艺，成功地组装了自支撑的钛酸锂(Li4Ti5O12)/碳纳米管/纤维素纳米纤维杂化网络膜，该工艺效率高，易于放大。这种用作锂离子电池(Lib)电极的杂化网络膜具有由Li4Ti5O12/碳纳米管/纤维素纳米纤维复合材料(以下简称LTO/CNT/CNF)和碳纳米管/纤维素纳米纤维复合材料(以下简称CNT/CNF)组成的双层结构。在杂化膜的异质纤维网络中，CNF同时作为建筑骨架和生物源粘结剂，替代了传统的有毒溶剂和合成聚合物粘结剂。值得注意的是，碳纳米管/碳纳米纤维层被用作轻质集电层，取代了传统的重金属箔，从而在保持活性物质的面积负载不变的情况下减少了电极的总质量。独立的网络膜具有高柔韧性，易于处理，具有极好的导电性，高达15.0 S厘米(-1)。LIBS柔性纸电极表现出很好的高倍率循环性能，即使在10C的电流倍率下，其比充放电容量也高达142mAHg(-1)。在温和的条件和快速的组装工艺的基础上，CNF模板在LIBS纸电极的制备中实现了多种功能，这将为高能量密度、低成本和环境友好的柔性电子产品提供越来越大的潜力。
A free-standing lithium titanate (Li4Ti5O12)/carbon nanotube/cellulose nanofiber hybrid network film is successfully assembled by using a pressure-controlled aqueous extrusion process, which is highly efficient and easily to scale up from the perspective of disposable and recyclable device production. This hybrid network film used as a lithium-ion battery (LIB) electrode has a dual-layer structure consisting of Li4Ti5O12/carbon nanotube/cellulose nanofiber composites (hereinafter referred to as LTO/CNT/CNF), and carbon nanotube/cellulose nanofiber composites (hereinafter referred to as CNT/CNF). In the heterogeneous fibrous network of the hybrid film, CNF serves Simultaneously as building skeleton and a biosourced binder, which substitutes traditional toxic solvents and synthetic polymer binders. Of importance here is that the CNT/CNF layer is used as a lightweight current collector to replace traditional heavy metal foils, which therefore reduces the total mass of the electrode while keeping the same areal loading of active materials The free-standing network film with high flexibility is easy to handle, and has extremely good conductivity, up to 15.0 S cm(-1). The flexible paper-electrode for LIBs shows very good high rate cycling performance, and the specific charge/discharge capacity values are up to 142 mAh g(-1) even at a current rate of 10 C. On the basis of the mild condition and fast assembly process, a CNF template fulfills multiple functions in the fabrication of paper-electrode for LIBs, which would offer an ever increasing potential for high energy density, low cost, and environmentally friendly flexible electronics.