Studies on the degradation of Li-ion batteries by the use of microreference electrodes

Li-ion batteries made by the Lithylene technology were investigated after extensive cycling for a mechanistic understanding of the capacity fade phenomena. The batteries cycled 500 times at 0.5 C were found to lose 13% of their original capacity, which was solely due to the loss of active materials....

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Vydáno v:Journal of power sources Ročník 177; číslo 2; s. 553 - 560
Hlavní autoři: Zhou, J., Notten, P.H.L.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Lausanne Elsevier B.V 01.03.2008
Elsevier Sequoia
Témata:
Active material loss
Applied sciences
Batteries
Cycles
Degradation
Direct energy conversion and energy accumulation
Disorders
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrodes
Exact sciences and technology
Impedance
Impedance increase
Li-ion batteries
Lithium-ion batteries
Surface area
Surface layer
Degradation
Impedance increase
Active material loss
Li-ion batteries
Measurement
Secondary cell
Electrode material
Discharge charge cycle
Reference electrode
Lithium battery
X ray diffractometry
Impedance
Electrode capacity
ISSN:0378-7753, 1873-2755
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Shrnutí:Li-ion batteries made by the Lithylene technology were investigated after extensive cycling for a mechanistic understanding of the capacity fade phenomena. The batteries cycled 500 times at 0.5 C were found to lose 13% of their original capacity, which was solely due to the loss of active materials. The negative electrode maintained its capacity to contain Li + ions from the positive electrode. The loss of positive electrode materials was attributed to formation and thickening of the surface layer and structure disorder evidenced by XRD measurements. In situ impedance measurements revealed that the positive electrode was also responsible for the impedance rise upon cycling. The charge transfer resistance was found to be the most influential factor in the battery impedance, which increased exponentially during cycling. This increase was proved not due to the decrease of positive electrode surface area but resulted from growth of the surface layer.
Bibliografie:ObjectType-Article-1
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content type line 23
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2007.11.032