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.
Highlights
As the industry develops and the population grows, the world’s energy demand has been increasing every year
The NCM-graphite full-cell in this study revealed a good cycle life of 98.25% after 50 cycles
To obtain enough photo-charging voltage, eight single Si solar cells were connected in a series
Summary
As the industry develops and the population grows, the world’s energy demand has been increasing every year. Problems of depletion of fossil fuels and environmental pollution such as SOx and NOx emission problems caused by wastes of fossil fuels have emerged around the world [1]. To solve these problems, interest in renewable energy has increased. It is more widely used than other renewable energies such as geothermal, wind, and tidal power [2]. Sunlight is highly dependent on weather conditions. It is necessary to store solar energy in a battery or a grid [3,4]
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