Cross‐Coupled Macro‐Mesoporous Carbon Network toward Record High Energy‐Power Density Supercapacitor at 4 V,Advanced Functional Materials

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Cross‐Coupled Macro‐Mesoporous Carbon Network toward Record High Energy‐Power Density Supercapacitor at 4 V
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-10-21 , DOI: 10.1002/adfm.201806153
Jing Li _{1,

2} , Ning Wang _{2,

3} , Jiarui Tian ₂ , Weizhong Qian ₂ , Wei Chu ₁

Affiliation

Ionic liquids (ILs) electrolyte hold tremendous potentials to develop high‐energy‐density electric double layer capacitor due to their wide voltage windows, but are severely plagued by the sluggish mass diffusion from high viscosity and large ion size, particularly over micropore‐dominated carbon electrodes. Exploiting the carbon electrode possessing high compatibility with ILs electrolyte remains a great challenge. Herein, an emerging 3D cross‐coupled macro‐mesoporous carbon network with ultrahigh specific surface area (SSA, 2872.2 m² g⁻¹), N‐self doping, small‐sized mesopores (2–4 nm) and macropores (50–150 nm) is designed via a facile, versatile, and ecofriendly salt‐template strategy from the NaNO₃‐gelatin biopolymer aerogel, which shows great adaptability toward high energy power density used in 4 V EMIBF₄ ILs (92 Wh kg⁻¹ is achieved at 1 kW kg⁻¹, and notably a record high energy density of 39 Wh kg⁻¹ is retained even at an ultrahigh power density of 200 kW kg⁻¹). The large energy density is ascribed to the plentiful ion‐available mesoporous active sites (S_meso/SSA = 86.6%, V_meso/V_total = 92.1%), while the extraordinary power density is attributed to the synergistic effects from the suitable macro‐mesoporous ion‐diffusion channels, continuous conductive network, low oxygen content (2.24%) as well as good affinity to ILs.

中文翻译：

交叉耦合的宏观介孔碳网络朝着创纪录的4 V高能量功率密度超级电容器发展

离子液体（ILs）电解质具有宽电压窗口，因此具有开发高能量密度双电层电容器的巨大潜力，但由于高粘度和大离子尺寸（特别是在微孔占主导的碳上）的质量扩散缓慢而受到严重困扰电极。开发与ILs电解质具有高度相容性的碳电极仍然是一个巨大的挑战。在此，一个新兴的3D交叉耦合的宏观中碳网络具有超高的比表面积（SSA，2872.2 m ² g ^-1），N自掺杂，小尺寸中孔（2-4 nm）和大孔（50-150） nm）是通过NaNO ₃的简便，多功能，生态友好型盐模板策略设计的-明胶生物聚合物气凝胶，其示出朝向高能量的功率密度大的适应性在4V的EMIBF使用₄离子液体（92瓦时千克^-1在达到1千瓦千克^-1，和特别的记录能量密度高39瓦时千克^-1是即使在200 kW kg ^-1的超高功率密度下也能保持稳定）。较大的能量密度归因于大量的离子可利用的介孔活性位点（S _meso / SSA = 86.6％，V _meso / V _total = 92.1％），而非凡的功率密度则归因于适当的宏观介孔离子扩散通道，连续导电网络，低氧含量（2.24％）以及对IL的良好亲和力所产生的协同效应。

更新日期：2018-10-21

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