期刊
ELECTROCHIMICA ACTA
卷 236, 期 -, 页码 443-450出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.03.189
关键词
pre-lithiation; Li4Ti5O12; lithium ion capacitors; mathematical analysis
资金
- China Postdoctoral Science Foundation [2014M550087]
- National Natural Science Foundation of China [51307167, 51677182, 51472238]
- Beijing Municipal Science and Technology Commission [Z171100000917007]
Pre-lithiation is a method that has been demonstrated to avoid the sudden cell voltage drop/rise during the charge/discharge in Li4Ti5O12 (LTO) anode and to compensate the energy loss of the first cycle resulting from the high initial potential of activated carbon (AC) cathode in lithium ion capacitors (LICs). However, the present pre-lithiation practices are largely empirical and lack of theoretical guidance. In the present study, we show from a theoretical perspective that the optimal pre-lithiation capacity range is closely related to the mass ratio (r) between the cathode and anode, and initial potential of AC cathode in a LIC. The optimal pre-lithiation capacity for the AC/LTO asymmetrical capacitor with a mass ratio of r = 2 and AC open circuit potential of 3.0 V is 34 <= C-pl <= 102mA hg (1). The theoretical prediction agrees well with the experimental data. This work promises to provide a practical guideline for optimizing the prelithiation level for a variety of LICs or LIBs systems. (C) 2017 Elsevier Ltd. All rights reserved.
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