Understanding and Calibration of Charge Storage Mechanism in Cyclic Voltammetry Curves

Angewandte Chemie - International Edition - Tập 60 Số 39 - Trang 21310-21318 - 2021
Xiangjun Pu1,2, Dong Zhao2, Chenglong Fu2, Zhongxue Chen2, Shunan Cao2, Chunsheng Wang3, Yuliang Cao1
1Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China
2Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan, China
3Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA

Tóm tắt

AbstractNoticeable pseudo‐capacitance behavior out of charge storage mechanism (CSM) has attracted intensive studies because it can provide both high energy density and large output power. Although cyclic voltammetry is recognized as the feasible electrochemical technique to determine it quantitatively in the previous works, the results are inferior due to uncertainty in the definitions and application conditions. Herein, three successive treatments, including de‐polarization, de‐residual and de‐background, as well as a non‐linear fitting algorithm are employed for the first time to calibrate the different CSM contribution of three typical cathode materials, LiFePO4, LiMn2O4 and Na4Fe3(PO4)2P2O7, and achieve well‐separated physical capacitance, pseudo‐capacitance and diffusive contributions to the total capacity. This work can eliminate misunderstanding concepts and correct ambiguous results of the pseudo‐capacitance contribution and recognize the essence of CSM in electrode materials.

Từ khóa


Tài liệu tham khảo

10.1039/D0EE01510E

10.1021/acsami.8b00478

10.1021/acsami.8b08297

10.3866/PKU.WHXB201712051

10.1039/C9CC04136B

10.1016/j.electacta.2019.03.164

10.1016/j.ensm.2019.02.017

10.1016/j.nanoen.2018.11.011

10.1002/smll.201805427

10.1038/nmat2612

10.1038/nmat2297

10.1126/science.aab3798

10.1126/science.1249625

10.1021/acsnano.8b01914

10.1021/ar200306b

10.1002/adfm.201502433

10.1021/acsami.6b00596

10.1021/acsnano.6b02608

10.1021/nn300920e

10.1002/adma.201605535

10.1021/acsaem.8b01275

10.1016/j.carbon.2021.01.114

10.1016/j.cej.2020.124125

10.1039/C9TA04274A

10.1016/j.nanoen.2020.105069

10.1002/eem2.12028

10.1021/cm303411t

10.1149/1.1516778

10.1021/nl803394v

10.1021/cm4013816

Thông tin
Thông tin xuất bản

Angewandte Chemie - International Edition

Tập 60 Số 39

21310-21318

Thông tin tác giả