Статья

Boosting High‐Voltage Dynamics Towards High‐Energy‐Density Lithium‐Ion Capacitors

Junfeng HuangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaXin LuKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaTeng SunKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaDaiyao YuKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaZhong XuKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaYanting XieKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaXinglin JiangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaYongbin WangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaShenglong WangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaXiong ZhangInstitute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 ChinaWeiqing YangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 ChinaHaitao ZhangKey Laboratory of Advanced Technologies of Materials Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 China

2022en

ABI

Аннотация

Lithium‐ion capacitors (LICs) are becoming important electrochemical energy storage systems due to their great potential to bridge the gap between supercapacitors and lithium‐ion batteries. However, capacity lopsidedness and low output voltage greatly hinder the realization of high‐energy‐density LICs. Herein, a strategy of balancing capacity towards fastest dynamics is proposed to enable high‐voltage LICs. Through electrochemical prelithiation of Nb 2 C to be 1.1 V with 165 mAh g −1 , Nb 2 C // LiFePO 4 LICs show a broadened potential window from 3.0 to 4.2 V and an according high energy density of 420 Wh kg −1 . Moreover, the underlying mechanism between prelithiation and high voltage is disclosed by electrochemical dynamic analysis. Prelithiation declines the Nb 2 C anode potential that facilitates electron transmission in the interlayer of two‐dimensional Nb 2 C MXene. This effect induces small drive force for Li + ions deposition and hence weakens the repulsive force from adsorbed ions on the electrode surface. Benefiting from even more Li + ions deposition, a higher voltage is eventually delivered. In addition, prelithiation significantly increases Coulomb efficiency of the 1st cycle from 74% to 90%, which is crucial to commercial application of LICs.

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Идентификаторы

DOI: 10.1002/eem2.12505

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar