Das Mononita, Das Pradip Sekhar, Pramanik Nimai Chand, Basu Rajendra Nath, Wasim Raja Mir
Energy Materials and Devices Division (Former Fuel Cell and Battery Division), CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.
Advanced Materials & Chemical Characterization Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.
ACS Omega. 2023 May 29;8(23):21315-21331. doi: 10.1021/acsomega.3c02859. eCollection 2023 Jun 13.
In the quest of developing a sustainable, low-cost and improved separator membrane for application in energy storage devices like lithium-ion batteries (LIBs) and supercapacitors (SCs), here we fabricated a trilayer cellulose-based paper separator engineered with nano-BaTiO powder. A scalable fabrication process of the paper separator was designed step-by-step by sizing with poly(vinylidene fluoride) (PVDF), thereafter impregnating nano-BaTiO in the interlayer using water-soluble styrene butadiene rubber (SBR) as the binder and finally laminating the ceramic layer with a low-concentration SBR solution. The fabricated separators showed excellent electrolyte wettability (216-270%), quicker electrolyte saturation, increased mechanical strength (43.96-50.15 MPa), and zero-dimensional shrinkage up to 200 °C. The electrochemical cell comprising graphite|paper separator|LiFePO showed comparable electrochemical performances in terms of capacity retention at different current densities (0.05-0.8 mA/cm) and long-term cycleability (300 cycles) with coulombic efficiency >96%. The in-cell chemical stability as tested for 8 weeks revealed a nominal change in bulk resistivity with no significant morphological changes. The vertical burning test as performed on a paper separator showed excellent flame-retardant property, a required safety feature for separator materials. To examine the multidevice compatibility, the paper separator was tested in supercapacitors, delivering a comparable performance to that of a commercial separator. The developed paper separator was also found to be compatible with most of the commercial cathode materials such as LiFePO, LiMnO, and NCM111.
为了开发一种可持续、低成本且性能更优的隔膜，用于锂离子电池（LIBs）和超级电容器（SCs）等储能设备，我们制备了一种用纳米BaTiO粉末改性的三层纤维素基纸质隔膜。通过以下步骤设计了一种可扩展的纸质隔膜制备工艺：先用聚偏氟乙烯（PVDF）进行施胶，然后使用水溶性丁苯橡胶（SBR）作为粘结剂将纳米BaTiO浸渍在中间层，最后用低浓度SBR溶液层压陶瓷层。制备的隔膜表现出优异的电解质润湿性（216 - 270%）、更快的电解质饱和速度、更高的机械强度（43.96 - 50.15 MPa）以及在高达200°C时零维收缩。由石墨|纸质隔膜|磷酸铁锂组成的电化学电池在不同电流密度（0.05 - 0.8 mA/cm²）下的容量保持率和长期循环稳定性（300次循环）方面表现出可比的电化学性能，库仑效率>96%。经过8周测试的电池内部化学稳定性表明，体积电阻率有微小变化，且无明显形态变化。对纸质隔膜进行的垂直燃烧测试显示出优异的阻燃性能，这是隔膜材料所需的安全特性。为了检验多设备兼容性，在超级电容器中对纸质隔膜进行了测试，其性能与商用隔膜相当。还发现所开发的纸质隔膜与大多数商用正极材料如磷酸铁锂、锰酸锂和NCM111兼容。
