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Abstract: This study reports an integrated device of a lithium-ion battery (LIB) connected with
Si solar cells. A Li(Ni0.65Co0.15Mn0.20)O2
(NCM) cathode and a graphite (G) anode were used to
fabricate the lithium-ion battery (LIB). The surface and shape morphologies of NCM and graphite
powder were characterized by field emission scanning electron microscopy (FE-SEM). The structural
properties of NCM and graphite powder were determined by X-ray diffraction (XRD) analysis. XRD
patterns of powders were well matched with those of JCPDS data. To investigate the electrochemical
characteristics of NCM and graphite, cycling tests were performed after assembling the NCM-Li,
the G-Li half-cell, and the NCM-G full-cell. The discharge capacity of the NCM cathode at 0.1C was
189.82 mAh/g−1
. The NCM-graphite full-cell showed 98.25% cycle retention at 1C after 50 cycles. To
obtain enough charging voltage for the LIB connected with solar cells in an integrated device, eight
single Si solar cells were connected in a series. The short-circuit photocurrent density for Si solar cells
was 4.124 mA/cm2
. The fill factor and the open circuit voltage were 0.78 and 4.5 V, respectively. These
Si solar cells showed a power conversion efficiency of 14.45%. The power conversion andstorage
efficiency of the integrated device of the NCM battery and Si solar cells was 7.74%. Charging of the
integrated device could be as effective as charging with a battery cycler
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