Electrochemical characterization of lithium vanadium oxide anode with agar binder in aqueous rechargeable lithium ion batteries
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Date
2018-06
Authors
Jacqueline Lease
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Abstract
The objective of this research is to study the effect of agar binder in lithium
vanadium oxide (LiV3O8) anode on electrochemical and physical performance of the
electrode. LiV3O8, graphene and agar binder were used to prepare LiV3O8 electrode in
8:1:1 ratio with different percentage of agar binder. The working electrode allowed to
be characterized as a half-cell setting for the characterization. The structural analysis
confirmed that the layered structure of LiV3O8 and graphene were formed. The binder
was also successfully bind the matrix of active material and graphene together based on
the morphology analysis. With the optimum scan rate (0.1 mV s-1) in cyclic
voltammetry (CV), 8% agar electrode has the best performance. The high coefficient
diffusion of lithium ions at 3.046 x 10-6 (anodic) and 1.315 x 10-6 cm2 s-1 (cathodic) for
the peaks were also further determined by CV characterization. Low charge transfer
resistances from impedance analysis in the anode half-cell showed the stability of the
anode. The capacity of the anode fading slowly upon cycling. Best scan rate in
charge/discharge has shown to obtain desirable initial specific charge and discharge
capacities which are 51.20 mA h g-1 and 76.12 mA h g-1. A good cyclic performance
with 84.1% capacity retention was obtained for 10 cycles at charge rate 2 C.
Throughout the characterization, the anode will degrade at the initial cycles but return to
stable after 25 cycles. LiV3O8 showed promising results when agar binder was added in
this study.