Cycle life modeling and the capacity fading mechanisms in a graphite/LiNi0.6Co0.2Mn0.2O2 cell

Autor:	Chung-Wan Ha, Ji-Hyun Yu, You-Jin Lee, Jeong-Hee Choi, Hae-Young Choi, Chil-Hoon Doh, Min-Ji Hwang
Rok vydání:	2015
Předmět:	Battery (electricity) Arrhenius equation Materials science General Chemical Engineering Thermodynamics Electrolyte Depth of discharge Electrochemistry symbols.namesake Electrode Materials Chemistry symbols Interphase Fading
Zdroj:	Journal of Applied Electrochemistry. 45:419-426
ISSN:	1572-8838 0021-891X
DOI:	10.1007/s10800-015-0811-6
Popis:	A 3.0 Ah pouch-type lithium-ion cell with a high energy density (200 Wh kg−1) was studied to establish a cycle life model of the battery. The cells consisted of graphite and LiNi0.6Co0.2Mn0.2O2 electrodes, and they were cycled at 1 C over a 100 % depth of discharge at different temperatures (25, 35, and 45 °C). A semi-empirical cycle life model was developed using experimental data by adopting a simple time power law and Arrhenius kinetics. The cycle life model agreed well with the experimental data but featured a much higher power law factor (1.3) compared to the value of 0.5 associated with the general t 1/2 rule based on the rate of solid electrolyte interphase (SEI) growth. The capacity fading mechanisms that operated within the cells were investigated using electrochemical, physical, and chemical diagnostic methods. These results revealed that the loss of active lithium ions via SEI formation as well as electrode degradation, especially cathode degradation, was responsible for the capacity fading in the cells.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e8a0bca381a244a0593d597b6d1a9ce6 https://doi.org/10.1007/s10800-015-0811-6 Zobrazit plný text záznamu Plný text ve formátu PDF