Jithu Joseph, Sreekala Kunhi Kannan, Krishnendu K. Surendran, Mary Gladis Joseph
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The high specific area (822 m<sup>2</sup>/g), hetero porosity, conductive carbon framework, surface functionalities and enriched N-doping of the PC@GCN synergistically induce mitigation of polysulfides via chemical and physical adsorption pathways in LSBs. The PC@GCN 21 modified separator demonstrates a high initial discharge capacity of 1389 mAh g<sup>−1</sup> at a 0.1C rate and exhibits better capacity retention over 500 cycles at a 1C rate (655 mAh g<sup>−1</sup>) with sulfur loading of 3.8 mg/cm<sup>2</sup> accompanied by high coulombic efficiency (94 %). The assembled cell with high S-loading (5.12 mg/cm<sup>2</sup>) shows a high initial discharge capacity of 712 mAh g<sup>−1</sup> at 0.1C rate conditions. High Li-ion transference number (0.714), stable shuttle current, minimal coulombic efficiency loss (0.84 %), low shuttle factor and negligible self-discharge behaviour support the superior performance of the PC@GCN 21 coated cells. 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引用次数: 0
摘要
汽车电气化、混合动力飞机和便携式电子产品的发展都要求使用高能量密度电池。硫的高理论容量(1675 mAh g-1)、锂硫电池(LSBs)的成本效益和环境友好性,为锂离子电池技术以外的电化学储能技术提供了有利条件。在这项工作中,我们介绍了一种简单、可扩展的制备方法,以及不同比例(PC@GCN 11、PC@GCN 12 和 PC@GCN 21)的多孔活性炭(PC)注入石墨氮化碳(GCN)纳米片作为 LSB 的多硫锚定功能化隔膜的电化学性能。PC@GCN 的高比表面积(822 m2/g)、异质多孔性、导电碳框架、表面功能性和丰富的 N 掺杂可通过化学和物理吸附途径协同缓解 LSB 中的多硫化物。PC@GCN 21 改性隔膜在 0.1C 放电速率下的初始放电容量高达 1389 mAh g-1,在 1C 放电速率下循环 500 次后容量保持率更高(655 mAh g-1),硫负荷为 3.8 mg/cm2,库仑效率高达 94%。高硫负载(5.12 mg/cm2)的组装电池在 0.1C 速率条件下显示出 712 mAh g-1 的高初始放电容量。高锂离子转移数(0.714)、稳定的穿梭电流、最小的库仑效率损失(0.84%)、低穿梭因子和可忽略的自放电行为都支持 PC@GCN 21 涂层电池的卓越性能。该报告表明,将高比表面积、非极性多孔碳与极性石墨氮化碳相结合,是为高能量 LSB 设计无金属功能化隔膜的一种实用方法。
Porous activated carbon integrated carbon nitride nanosheets as functionalized separators for the efficient polysulfide entrapment in LiS batteries
Electrification of vehicles, hybrid aircraft and the advancement of portable electronics are exacting the deployment of high energy-dense batteries. The high theoretical capacity of sulfur (1675 mAh g−1), cost-effectiveness and environmental benignity of the lithium‑sulfur batteries (LSBs) are propitious for electrochemical energy storage beyond Li-ion battery technology. In this work, we described a simple, scalable preparation and electrochemical performance of porous activated carbon (PC)-infused graphitic carbon nitride (GCN) nanosheets with various ratios (PC@GCN 11, PC@GCN 12 and PC@GCN 21) as a polysulfide anchoring functionalized separator for LSBs. The high specific area (822 m2/g), hetero porosity, conductive carbon framework, surface functionalities and enriched N-doping of the PC@GCN synergistically induce mitigation of polysulfides via chemical and physical adsorption pathways in LSBs. The PC@GCN 21 modified separator demonstrates a high initial discharge capacity of 1389 mAh g−1 at a 0.1C rate and exhibits better capacity retention over 500 cycles at a 1C rate (655 mAh g−1) with sulfur loading of 3.8 mg/cm2 accompanied by high coulombic efficiency (94 %). The assembled cell with high S-loading (5.12 mg/cm2) shows a high initial discharge capacity of 712 mAh g−1 at 0.1C rate conditions. High Li-ion transference number (0.714), stable shuttle current, minimal coulombic efficiency loss (0.84 %), low shuttle factor and negligible self-discharge behaviour support the superior performance of the PC@GCN 21 coated cells. This report demonstrates that combining the high surface area, non-polar porous carbon with polar graphitic carbon nitride is a practical approach for designing metal-free functionalized separators for energy-dense LSBs.
期刊介绍:
Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.