A facile method with one-pot polyol-assisted pyro-technique has been adopted to synthesize highly crystalline, carbon-coated LiMn
2
O
4
(LMO/C) nanoparticles for using as a cathode material in ...rechargeable Li-ion battery (LIB) applications. this study shows the efficacy of a simple and low-cost pyro-synthesis to realize high performance nano-sized particle electrodes with uniform carbon coating for useful energy storage applications. As using X-ray techniques, we confirmed The phase purity, structure and stoichiometry of the prepared cathode. Electron microscopy studies established that the synthetic technique facilitated the production of nano-sized LMO particles with uniform carbon coating. LMO/C cathode demonstrates excellent electrochemical properties (cycling stabilities of 86% and 77.5% and high rate capabilities of 79% and 36% within the potential windows of 3.3–4.3V and 2.5–4.3V, respectively). The high electrochemical performance of the LMO/C cathode is attributed to the nano-size of the LiMn
2
O
4
particles enabling high surface area and hence greater lithium insertion and also the uniform amorphous carbon coating facilitating effective reduction in manganese dissolution and volume expansion during the lithium de-intercalation/intercalation reactions
Research attention in aqueous rechargeable zinc-ion batteries (ARZIBs) is growing immensely because of their low-cost and eco-friendly cell components. However, its challenging to find new cathode ...materials towards practical application of ARZIBs. In this contribution, ground-breaking work on the potassium-pillared V
2
O
5
.nH
2
O (K
0.5
V
2
O
5
.nH
2
O) nanorod with exposed layer structure as high-performance cathode for ARZIB is presented. The storage mechanism of the K
0.5
V
2
O
5
.nH
2
O cathode in ARZIB is systematically elucidated using a combined of
in situ
synchrotron X-ray diffraction,
ex situ
synchrotron X-ray absorption spectroscopy,
ex situ
TEM analyses, and first-principle calculations. The K
0.5
V
2
O
5
. nH
2
O cathode displays a notable discharge capacity of 439 mAh g
−1
at a current density of 50 mA g
−1
. Furthermore, it recovers 96% of the capacity after 1500 cycles at 8000 mA g
−1
. Impressively, the Zn/K
0.5
V
2
O
5
.nH
2
O battery offers a specific energy of 121 Wh kg
−1
at a high specific power of 6480 W kg
−1
. The superior performance of the cathode is attributed to its unique exposed layer structure with high surface energy, high conductivity, and low migration barrier. The zinc (Zn) insertion pathway into K
0.5
V
2
O
5
.nH
2
O was studied using density function theory (DFT). This study provides an insight for designing high-performance cathode materials for ARZIBs and other electrochemical systems.
In this paper, the authors is going to propose a light shelf system among natural lighting systems to save lighting energy consumption. The light shelf system proposed in this study uses a method ...that satisfies the luminance required by the user through user awareness technology that applies IT technology, and, in the case of luminance that has failed to satisfy the requirements of the user, it satisfies such requirements through lighting control, and such lighting control saves energy by adjusting to steps 1-8 using dimming control instead of the existing on/off control method. For the performance evaluation of energy saving, the possibility of introducing dimming control to housing and its efficiency were tested by conducting an energy performance evaluation by seasons using an actual scale test bed operable 24 hours for 365 days. The author believes that dimming control can lead to energy savings, as the results of the present study suggest that dimming control saved 47.8%-61% of energy consumption compared to on/off control.
