正负极配比对镍铁锰酸钠//活性炭(NFM//AC)钠离子电容器性能的影响  

The effect of positive/negative capacity ratio on the sodium nickel iron manganese oxide//activated carbon(NFM//AC)sodium ion capacitors

作　　者：安仲勋 范羚羚 夏恒恒 AN Zhongxun;FAN Lingling;XIA Hengheng(National Engineering Research Center for Supercapacitor for Vehicles,Shanghai Aowei Technology Development Co.,Ltd.,Shanghai 201203,China;College of Sciences,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海奥威科技开发有限公司.国家车用超级电容器系统工程技术研究中心,上海201203 [2]上海大学理学院,上海200444

出　　处：《电子元件与材料》2025年第1期33-40,共8页Electronic Components And Materials

基　　金：上海市“中央引导地方科技发展基金项目”(YDZX20223100003005)。

摘　　要：钠离子电容器(SICs)是近些年来兴起的新型储能器件,相较于双电层电容器(EDLCs)具有更高的能量密度,相较于钠离子电池(SIBs)具有更高的功率密度,同时兼具了成本和长循环寿命优势,虽然国内外研究还处于起步阶段,但已成为电化学储能器件领域的研究热点。本文以镍铁锰酸钠(NFM)为正极,活性炭(AC)为负极,采用六氟磷酸钠(NaPF6)/乙腈(CH3 CN)为电解液,组装了不同正/负极配比(P/N比)的钠离子电容器,研究了其在充放电、循环伏安、电化学阻抗、倍率、脉冲及循环寿命方面的性能。结果表明:NFM//AC钠离子电容器在恒电流充放电过程中表现为良好的电容性行为曲线;P/N比为2.0的钠离子电容器具有较小的内阻且综合性能最优,在0.5~2.3 V的放电比容量为39.35 F·g^(-1);在31.61 W·kg^(-1)功率密度下的能量密度可达39.45 Wh·kg^(-1),在5466.73 W·kg^(-1)功率密度下的能量密度仍有19.86 Wh·kg^(-1),10 ms脉冲测试中基于正负极活性物质和全器件的最大比功率分别为34392.45 W·kg^(-1)和7933.04 W·kg^(-1);在1.0~2.3 V电压区间循环34000圈的容量保持率为97.1%,在1.0~2.7 V电压区间循环20389圈的容量保持率为80.0%。Sodium ion capacitors(SICs)are new energy storage devices emerged in recent years,the energy density of which is higher than that of the electric double layer capacitors(EDLCs)while the power density of which is higher than that of the sodium ion batteries(SIBs),combining the advantages of low cost and long life.Although the development of SICs is still in the primary stage at home and abroad,it has become the academic research hotspot in the field of electrochemical energy storage devices.In this work,the pouched SICs with different positive/negative capacity ratios(P/N ratio)were fabricated with sodium nickel iron manganese oxide(NFM)as the cathode,activated carbon(AC)as the anode and acetonitrile-based electrolyte(NaPF6/CH3 CN).The electrochemical performance of charging/discharging ability,cyclic voltammetry,electrochemical impedance,rate capability,pulse and cycle life were investigated.The results show that the NFM//AC SICs exhibit good capacitive curves behavior in the charging/discharging test.The SIC with P/N ratio of 2.0 displays the smaller resistance and the best comprehensive performance including the higher discharge specific capacity of 39.35 F·g^(-1)at 0.5-2.3 V,the energy density of 39.45 Wh·kg^(-1)at the power density of 31.61 W·kg^(-1),and 19.86 Wh·kg^(-1)at 5466.73 W·kg^(-1),the maximum power density obtained in the pulse testing of 34392.45 W·kg^(-1)(based on the mass of active materials)and 7933.04 W·kg^(-1)(based on the weight of SIC).The capacity retention is 97.1%at 34000 cycles under 1.0-2.3 V,which reduces to 80.0%after 20389 cycles under 1.0-2.7 V.

关 键 词：钠离子电容器 活性炭 镍铁锰酸钠 P/N比 功率密度 

分 类 号：TM53[电气工程—电器]