【摘要】 钠离子电池型电容器（SIBatCs）融合了钠离子电池（SIBs）的高比能和钠离子电容器（SICs）的高功率特性，在能量回收、电网调频和快充交通等领域展现出良好的应用前景。集流体作为电化学储能器件的关键组分，对电芯的电性能和成本具有显著影响。铝箔已在SIBs体系中广泛应用，但其在SIBatCs中的电化学性能尚未得到验证。基于相同的负极/正极容量比，通过调控活性物质的面密度，成功设计了功率型和能量型两类商业化SIBatCs,其容量分别为6 Ah（10000 F）和8 Ah（12000 F）。电化学性能对比及成本分析结果表明：对于功率型或能量型SIBatCs,分别采用10μm厚度铜箔和20μm厚度铝箔作负极集流体，电芯的首次充放电效率、容量、内阻、循环以及高温存储性能表现近乎一致。与铜箔相比，采用铝箔作为负极集流体时，功率型和能量型SIBatCs的质量能量密度分别提升11.3%和7.1%,单位能量成本则分别下降15.7%和13.0%。采用铝箔作负极集流体，单体电芯在大倍率循环后，电荷转移阻抗(R_ct)增幅更大，主要归因于铝的比热容高于铜且导热系数低于铜，铝集流体-铝极耳组合散热能力差，致使电芯温度偏高，引发相对剧烈的电极/电解液界面副反应。综合分析，高功率SIBatCs采用铝箔作负极集流体具备可行性，但在模组设计时需重点考虑电芯散热问题。本研究为商业化高功率、长寿命SIBatCs的开发及应用提供了重要参考。更多还原

【Abstract】 Sodium ion battery capacitors（SIBatCs） integrate the high energy density of sodium ion batteries（SIBs） with the high power density of sodium ion capacitors（SICs）, thereby showing broad prospects in energy recovery, power grid frequency regulation, and fast-charging transportation. As crucial components of electrochemical energy storage devices, current collectors significantly influence both the electrochemical performance and cost of the devices. Although aluminum foil is widely used in SIBs, its performance in high-power SIBatCs remains unvalidated. In this study, two types of commercial SIBatCs, including Power-type（6 Ah, 10000 F） and Energy-type（8 Ah, 12000 F）, were designed by regulating the electrode areal densities under the same negative/positive capacity ratio. A comparative analysis of electrochemical performance and cost was then conducted for SIBatCs using copper foil and aluminum foil as negative current collectors, respectively. Results demonstrated that for both Power-type and Energy-type SIBatCs, 10 μm-thick copper foil and 20 μm-thick aluminum foil exhibited comparable performance in terms of initial coulombic efficiency, capacity, internal resistance, cyclic stability, and high-temperature storage performance. Notably, replacing copper foil with aluminum foil increased the mass energy density of Power-type and Energy-type SIBatCs by 11.3% and 7.1%, respectively, while reduced their unit energy cost by 15.3% and 13.0%, accordingly. However, SIBatCs employing aluminum foil showed a larger growth in charge transfer impedance(R_ct) after cycling. This phenomenon is mainly attributed to the fact that aluminum has a higher specific heat capacity and lower thermal conductivity than coppe. These properties elevate the cell temperature and exacerbate side reactions at the electrode/electrolyte interface. Overall, aluminum foil was proven viable as a negative current collector for SIBatCs, but enhanced heat dissipation must be prioritized in module design. This research provides critical insights for the engineering development and practical application of high-performance commercial SIBatCs.更多还原