Li1.6Mn1.6−xCrxO4 was synthesized by hydrothermal reaction followed by acid leaching to form lithium ion sieve. The structure, morphology and composition were examined using X-ray diffraction, SEM and EDS. The influences of Cr doping content and hydrothermal temperature on Li+ adsorption capacity and manganese dissolution ratio were investigated. The result indicates that Cr is incorporated into the spinel structure with cell contraction when x ≤ 0.08. Li1.6Mn1.6−xCrxO4 shows Li+ adsorption capacity of 31.67 mg/g and Mn dissolution ratio of 2.1% when x is 0.016 at 270 °C. After 20 cycles in salt lake brine, the Mn dissolution ratio and Li adsorption capacity is 0.35% and 25.5 mg/g, respectively. The Cr-doped ion-sieve shows improved adsorption capacity, retention and structural stability compared with the undoped lithium ion-sieve. The adsorption process for the Cr-doped ion-sieve follows a pseudo-second-order kinetic model.
Solar cells offer clean and abundant power sources for directly photo‐charging rechargeable batteries, which shows great potential for the development of integrated power supply. In order to deepen the understanding of the novel type of charging process, this research takes silicon solar cells and lithium cobalt oxide batteries as examples to compare the performance difference between photo‐charging and conventional constant current charging in detail. Surprisingly, the photo‐charging turns out to be superior in charging efficiency, polarization mitigation, and cyclic performance even with the intrinsic instability of the solar cells when compared with constant current charging mode. Finally, this research optimizes the calculation method of energy storage efficiency in the integrated power supply by calculating the actual power during the photo‐charging process by recording the voltage and current change with time. Besides, the power matching degree is quantified by the ratio of η1____ to η1, providing new ideas for the matching method of solar cells and rechargeable batteries in integrated power supplies.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.