A Novel Nanocomposite Polymer Electrolyte for Application in Solid State Lithium Ion Battery

• Main Authors: Satyanarayana Reddy, S. Sai, Ravindra, J.V.R., Reddy, N. Hanuman, Polu, Anji Reddy
• Format: Conference Proceeding
• Language: English
• Subjects: Conductivity; Electrolytes; glass transition temperature; ionic conductivity; Li-ion battery; Lithium; Lithium-ion batteries; Loading; nanocomposite polymer electrolytes; Nanoparticles; Organic-inorganic hybrid nanoparticles; Polymers
• ISSN: 1944-9380
• DOI: 10.1109/NANO.2018.8626268

Nanocomposite polymer electrolytes (NCPE) have been prepared by blending poly(ethylene oxide) (PEO) and polyhedral oligomeric silsesquioxane-functionalized with poly(ethylene glycol) (POSS- PEG) with lithium bis(oxalate) borate (LiBOB). Different thermal, electrical and electrochemical studies exhibit promising characteristics of these polymer electrolytes, suitable as electrolytes in rechargeable lithium-ion batteries. POSS-PEG was highly compatible with PEO up to 50 wt% and resulted in single \mathbf{T}_{\mathbf{g}} and increased ionic conductivity. The ionic conductivity of the nanocomposites increased to 3.98\times 10^{-6} S/cm at 50 wt% of POSS-PEG by more than 2 orders of magnitude. POSS-PEG nanoparticles sustainably increased ionic conductivity without impeding chain motion of polymer and were highly compatible with PEO up to 50 wt% of POSS-PEG, which can mitigate the restriction of the amount of nanoparticles introduction. The Li/PEO-LiBOB-POSS PEG/LiFeP0 4 coin-typed cell cycled at 0.1 C shows the 1^{\mathbf{st}} discharge capacity about 146 mAh \mathbf{g}^{-1} , and remains 126.2 mAh \mathbf{g}^{-1} on the 50^{\mathbf{th}} cycle. Overall, these results indicate that POSS-PEG nanocomposites can be potentially useful as a new class of nanocomposite polymer electrolytes for rechargeable lithium batteries.