物理化学学报

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基于活性炭||Na0.44MnO2的低成本、高倍率和长寿命碱性钠离子电池电容器

薛晴1, 李圣驿1, 赵亚楠2, 盛鹏1, 徐丽1, 李正曦3, 张波4, 李慧1, 王博1, 杨立滨3, 曹余良2, 陈重学5   

  1. 1 北京智慧能源研究院, 北京 102200;
    2 武汉大学化学与分子科学学院, 化学电源材料与技术湖北省重点实验室, 武汉 430072;
    3 国网青海省电力公司经济技术研究院, 西宁 810008;
    4 国网金华供电公司, 浙江 金华 321017;
    5 武汉大学动力与机械学院, 水力机械过渡过程教育部重点实验室, 武汉 430072
  • 收稿日期:2023-03-20 修回日期:2023-04-14 录用日期:2023-04-17 发布日期:2023-04-21
  • 通讯作者: 曹余良, 陈重学 E-mail:ylcao@whu.edu.cn;zxchen_pmc@whu.edu.cn
  • 基金资助:
    国家电网公司科技计划(5500-202158251A-0-0-00)资助项目

Novel Alkaline Sodium-Ion Battery Capacitor Based on Active Carbon||Na0.44MnO2 towards Low Cost, High-Rate Capability and Long-Term Lifespan

Qing Xue1, Shengyi Li1, Yanan Zhao2, Peng Sheng1, Li Xu1, Zhengxi Li3, Bo Zhang4, Hui Li1, Bo Wang1, Libin Yang3, Yuliang Cao2, Zhongxue Chen5   

  1. 1 Beijing Institute of Smart Energy, Beijing 102200, China;
    2 Hubei Key Laboratory of Chemical Power Source Materials and Technology, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China;
    3 State Grid Qinghai Electric Power Company, Economic and Technological Research Institute, Xining 810008, China;
    4 State Grid Jinhua Power Supply Company, Jinhua 321017, Zhejiang Province, China;
    5 Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
  • Received:2023-03-20 Revised:2023-04-14 Accepted:2023-04-17 Published:2023-04-21
  • Contact: Yuliang Cao, Zhongxue Chen E-mail:ylcao@whu.edu.cn;zxchen_pmc@whu.edu.cn
  • Supported by:
    The project was supported by the Science and Technology Project of State Grid Corporation of China (5500-202158251A-0-0-00).

摘要: 水系钠离子电池电容器具有成本低、功率大、安全性好等优点,是下一代大规模储能系统的理想选择之一。本文采用Na0.44MnO2正极、活性炭(AC)负极、6 mol∙L-1 NaOH电解液和廉价的不锈钢集流体构建了可充电碱性钠离子电池电容器。由于Na0.44MnO2正极在碱性电解液中具有较高的过充耐受性,通过首次充电时的原位过充预活化过程可以解决半钠化Na0.44MnO2正极和AC负极初始库伦效率低的缺点。因此,AC||Na0.44MnO2可充电碱性钠离子电池电容器具有优异的电化学性能,在功率密度为85 W∙kg-1时,能量密度达26.6 Wh∙kg-1,循环10000次后容量保持率为89%。同时,在50 °C的高温和-20 °C的低温也具有良好的电化学性能。这些结果表明AC||Na0.44MnO2可充电碱性钠离子电池电容器具备应用于大规模储能的潜力。

关键词: 钠离子电池电容, 碱性电解液, 过充自保护, 低成本, 宽工作温程

Abstract: As the most advanced battery technology to date, lithium-ion battery has occupied the main battery markets for electric vehicles and grid scale energy storage systems. However, the limited lithium reserves as well as the high price raise concerns about the sustainability of lithium-ion battery. Although sodium-ion battery is proposed as a good supplement to lithium-ion battery, expensive and flammable electrolyte components, harsh assembly environments and potential safety hazards have limited the rapid development to a certain extent. The organic electrolyte was replaced with an aqueous solution to construct a new type of aqueous sodium ion battery capacitor (ASIBC). It is of great significance for next-generation energy storage system owing to its low cost, high power, and inherent safety. However, applicable ASIBC system is rarely reported so far. Here, a rechargeable alkaline sodium ion battery capacitors constructed by using Na0.44MnO2 cathode, activated carbon (AC) anode, 6 mol∙L-1 NaOH electrolyte, and cheap stainless-steel current collector. Because of high overcharge tolerance of Na0.44MnO2 cathode in alkaline electrolyte, the shortcomings of the half-sodium Na0.44MnO2 cathode and low initial Coulombic efficiency of AC anode can be resolved by in situ overcharging pre-activation process during first charging. The available capacity of Na0.44MnO2 in half cell largely increased from ~40 mAh∙g-1 (neutral electrolyte) to 77.3 mAh∙g-1 (alkaline electrolyte) due to broadened Na+ intercalation potential region. Thus, the AC||Na0.44MnO2 ASIBC delivers outstanding electrochemical properties with a high energy density of 26.6 Wh∙kg-1 at a power density of 85 W∙kg-1 and long cycling stability with a capacity retention of 89% after 10,000 cycles. The advantages of the alkaline electrolyte for the AC||Na0.44MnO2 ASIBC can be concluded as follows: (1) through the in situ electrochemical pre-activation process, the overcharging oxygen evolution reaction during first charging process can balance the adverse effects of the half-sodium Na0.44MnO2 cathode and low initial Coulombic efficiency of AC anode on the energy density of full cell; (2) the overcharging self-protection function can promote the generated oxygen to be eliminated at anode during overcharging, which improves the system safety; (3) the low-cost materials in alkaline environment can be scaled up to construct AC||Na0.44MnO2 ASIBC. In addition, the AC||Na0.44MnO2 ASIBC also possesses wide operating temperature range, achieving satisfied electrochemical performance at a high temperature of 50 °C and a low temperature of -20 °C. Considering the merits of low-cost, high safety, no toxicity and environment-friendly, we believe the AC||Na0.44MnO2 rechargeable alkaline sodium-ion battery capacitors have the potential to be applied to large-scale energy storage.

Key words: Sodium-ion battery capacitor, Alkaline electrolyte, Overcharging self-protection, Low cost, Wide operating temperature range