以预锂化中间相碳微球为负极的锂离子电容器的电化学性能

引用本文: 平丽娜, 郑嘉明, 时志强, 王成扬. 以预锂化中间相碳微球为负极的锂离子电容器的电化学性能[J]. 物理化学学报, 2012, 28(07): 1733-1738. doi: 10.3866/PKU.WHXB201205092 shu

Citation: PING Li-Na, ZHENG Jia-Ming, SHI Zhi-Qiang, WANG Cheng-Yang. Electrochemical Performance of Lithium Ion Capacitors Using Li⁺-Intercalated Mesocarbon Microbeads as the Negative Electrode[J]. Acta Physico-Chimica Sinica, 2012, 28(07): 1733-1738. doi: 10.3866/PKU.WHXB201205092 shu

以预锂化中间相碳微球为负极的锂离子电容器的电化学性能

基金项目:
国家自然科学基金(51172160, 50902102) (51172160, 50902102)

国家高技术研究发展计划项目(863) (2011AA11A232)资助 (863) (2011AA11A232)

摘要:

以商品活性炭(AC)为正极, 预锂化中间相碳微球(LMCMBs)为负极, 组装成锂离子电容器(LICs). 用X射线衍射(XRD)对LMCMB 电极材料的晶体结构进行了表征和分析, 预锂化量(PIC)小于200 mAh·g^-1 时,LMCMB电极材料基本保持了原始的石墨晶体结构. 利用三电极装置, 测试了充放电过程中LICs 的正、负极及整电容器的电压变化曲线. 以LMCMB为电极, 锂离子电容器负极的工作电压变低, 并且电压曲线更加平坦, 同时正极也可以利用到更低的电压区间. 对比锂离子电容器MCMB/AC, LMCMB/AC在比能量密度、循环性能和库仑效率电化学性能方面都得到了改善. 在电压区间2.0-3.8 V 下, 100 次循环后, 放电比容量的保持率从74.8%增加到100%, 库仑效率从95%增加到100%. LMCMB/AC电容器容量不衰退的直接原因是由于AC正极极化变小. 在2.0-3.8 V和1.5-3.8 V电压区间内, LMCMB/AC锂离子电容器的比能量密度分别可达85.6和97.9 Wh·kg^-1.

关键词:

English

Electrochemical Performance of Lithium Ion Capacitors Using Li⁺-Intercalated Mesocarbon Microbeads as the Negative Electrode

1.
1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China;
2. Tianjin Key Laboratory of Fiber Modification and Functional Fiber, College of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, P. R. China
Received Date: 05 March 2012
Available Online: 07 June 2012
Fund Project:
国家自然科学基金(51172160, 50902102)

国家高技术研究发展计划项目(863) (2011AA11A232)资助

Abstract:

Lithium ion capacitors (LICs) were fabricated using Li +-intercalated mesocarbon microbeads (LMCMBs) as the negative electrode and commercial activated carbon (AC) as the positive electrode. The phase structure of LMCMB electrodes was characterized by X-ray diffraction (XRD). LMCMB electrodes retain their original graphite crystal structure when the capacity induced by initial Li⁺ intercalation is less than 200 mAh·g^-1. The charge-discharge performances of positive and negative electrodes and LICs were studied using a three-electrode cell. Using an LMCMB electrode as an anode, a stable working potential is obtained at lower voltage than using other electrodes, and the potential range of the positive electrode is extended to a lower range. The electrochemical performance of LMCMB/AC capacitors, including capacitance, cycle life, and efficiency, is improved compared with that of an MCMB/AC capacitor. The efficiency increases from less than 95% to nearly 100%, and the capacity retention is improved from 74.8% to nearly 100% for 100 cycles in a voltage range of 2.0 to 3.8 V. The stable capacity of LMCMB/AC capacitors with cycling is directly correlated to less polarization of AC during the charge storage process, which is caused in turn by the LMCMB negative electrode. Gravimetric energy densities as high as 85.6 and 97.9 Wh·kg^-1 are obtained in voltage ranges of 2.0 to 3.8 V and 1.5 to 3.8 V, respectively.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

以预锂化中间相碳微球为负极的锂离子电容器的电化学性能

English

Electrochemical Performance of Lithium Ion Capacitors Using Li⁺-Intercalated Mesocarbon Microbeads as the Negative Electrode

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

以预锂化中间相碳微球为负极的锂离子电容器的电化学性能

English

Electrochemical Performance of Lithium Ion Capacitors Using Li+-Intercalated Mesocarbon Microbeads as the Negative Electrode

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Electrochemical Performance of Lithium Ion Capacitors Using Li⁺-Intercalated Mesocarbon Microbeads as the Negative Electrode

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs