Morphology optimizing of polyvinylidene fluoride ( PVDF ) nanofiber separator for safe lithium‐ion battery

Lithium ion battery is composed of three main parts, i.e. cathode, anode and electrolyte. In this work, we investigated the effect of LiFePO4 cathode composite’s thickness on performances of lithium battery. LiFePO4 cathode was prepared in a slurry that consisted of lithium iron phosphate (LiFePO4) powder as active material, acetylene black as conductive additive, polyvinylidene fluoride (PVDF) as binder, and N-methyl-2-pyrrolidone (NMP) as solvent. The slurry was then deposited on the aluminum substrate using doctor blade method in different thickness. The cathode layers were deposited with the thickness of 150, 200, 250 & 300 μm. The structure characterization of the material was analyzed by XRD, while the material’s morphology was analyzed by Scanning Electron Microscope (SEM). Performances of lithium ion battery with LiFePO4 cathode were evaluated using charge-discharge cycle test. It is found that battery made of cathode layer with 250 μm thickness shows the best performances.

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Performance enhancement of a lithium ion battery by incorporation of a graphene/polyvinylidene fluoride conductive adhesive layer between the current collector and the active material layer

Journal of Power Sources ◽

10.1016/j.jpowsour.2012.11.079 ◽

2013 ◽

Vol 244 ◽

pp. 721-725 ◽

Cited By ~ 32

Author(s):

Sangmin Lee ◽

Eun-Suok Oh

Keyword(s):

Lithium Ion Battery ◽

Polyvinylidene Fluoride ◽

Performance Enhancement ◽

Active Material ◽

Lithium Ion ◽

Adhesive Layer ◽

Current Collector ◽

Conductive Adhesive ◽

Material Layer

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Meso Carbon Micro Bead (MCMB) Based Graphitized Carbon for Negative Electrode in Lithium Ion Battery

KnE Engineering ◽

10.18502/keg.v0i0.497 ◽

2016 ◽

Vol 1 (1) ◽

Author(s):

Fadli Rohman

Keyword(s):

Lithium Ion Battery ◽

Polyvinylidene Fluoride ◽

Active Material ◽

Lithium Ion ◽

Crystal Phase ◽

Cyclic Voltammograms ◽

Full Cell ◽

Graphitized Carbon ◽

Charge Discharge ◽

Discharge Test

Lithium ion battery performance of graphitized Meso Carbon Micro Beads (MCMB) as an anode material was investigated in full cell battery system containing LiCoO2 cathode, PE separator and LiPF6 electrolyte. The commercial MCMB, which was fabricated by LinyiTM, was sintered at 500⁰C for five hour to make graphitized MCMB. The microstructure of graphitized MCMB was characterized using XRD and SEM to show the crystalinity, crystal phase and morphology of the MCMB particle. The result indicated that the crystal phase of the sample was changed into graphitized carbon .The electrode was made using coating method. We used copper foil as the substrate for anode. The anode materials consist of graphitized MCMB (active material), Polyvinylidene fluoride/PVDF (binder) and acetylene black (additive material). Full cell battery was tested using charge-discharge and cyclic voltammetry (CV) methods. From the CV characterization, cyclic voltammograms of the cell show characteristic lithium intercalation through reduction-oxidation peak. Charge-discharge test showed the discharge and charge capacity of the cells. According charge discharge test, commercial MCMB was better that graphitized MCMB.

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