TY - JOUR
T1 - Mechanical robustness of composite electrode for lithium ion battery
T2 - Insight into entanglement & crystallinity of polymeric binder
AU - Byun, Seoungwoo
AU - Choi, Jaecheol
AU - Roh, Youngjoon
AU - Song, Danoh
AU - Ryou, Myung Hyun
AU - Lee, Yong Min
PY - 2020/2/1
Y1 - 2020/2/1
N2 - To investigate the correlation between the molecular weight of the polymeric binder in Li-ion battery electrodes and their adhesion properties, polyvinylidene fluoride (PVdF) with three different molecular weights of 500,000, 630,000, and 1,000,000 are selected for LiCoO2 electrode fabrication. Using a surface and interfacial cutting analysis system, it is observed that, as the molecular weight of the PVdF increases, the adhesion strength not only in the electrode composite, but also at the electrode/current collector interface increases. This enhancement can be attributed to the increased polymeric chain entanglement and higher crystallinity of PVdF with higher molecular weight, which is confirmed using a microfluidic viscometer and differential scanning calorimeter, respectively. In summary, regardless of slightly higher electrode resistance, the LiCoO2 electrode with a PVdF binder of high molecular weight shows better electrochemical performance during cycling test even at 60 °C due to its stable mechanical integrity.
AB - To investigate the correlation between the molecular weight of the polymeric binder in Li-ion battery electrodes and their adhesion properties, polyvinylidene fluoride (PVdF) with three different molecular weights of 500,000, 630,000, and 1,000,000 are selected for LiCoO2 electrode fabrication. Using a surface and interfacial cutting analysis system, it is observed that, as the molecular weight of the PVdF increases, the adhesion strength not only in the electrode composite, but also at the electrode/current collector interface increases. This enhancement can be attributed to the increased polymeric chain entanglement and higher crystallinity of PVdF with higher molecular weight, which is confirmed using a microfluidic viscometer and differential scanning calorimeter, respectively. In summary, regardless of slightly higher electrode resistance, the LiCoO2 electrode with a PVdF binder of high molecular weight shows better electrochemical performance during cycling test even at 60 °C due to its stable mechanical integrity.
KW - Adhesion properties
KW - Composite electrode
KW - Molecular weight
KW - Polyvinylidene fluoride
KW - SAICAS
UR - http://www.scopus.com/inward/record.url?scp=85076262271&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2019.135471
DO - 10.1016/j.electacta.2019.135471
M3 - Article
AN - SCOPUS:85076262271
SN - 0013-4686
VL - 332
JO - Electrochimica Acta
JF - Electrochimica Acta
M1 - 135471
ER -