The cover image, by Mario Grágeda et al., is based on the Research Article Purification of brines by chemical precipitation and ion-exchange processes for obtaining battery-grade lithium compounds, 10.1002/er.4008.

The article systematically analyzes the present situation and reasons of the China's wind and photovoltaic curtailment from market and policy aspects. The quantitative analysis (empirical analysis, cause analysis, and trend analysis) has been made on the accommodation capability issue. A comprehensive solution from four aspects (technology, institution, legislation, and policy perspective) is designed at last.

A simplified one-dimensional mathematical model compatible to wide geometric range and climatic conditions was developed. The error prediction by the mathematical model was less than 9%. The daily average exit air velocity of 0.5 m s⁻¹ was calculated with a model prediction of 0.55 m s⁻¹.

Lithium salts require very low levels of impurities in the fabrication of cathode materials in Li-ion cells. A novel laboratory-scale process was developed using the methods of chemical precipitation and ion exchange. The removal efficiencies of chemical precipitation method were of 98.93%, 99.93%, and 97.14% for Ca⁺², Mg⁺², and SO₄^–2, respectively. The application of the ion-exchange resins reduced the concentration of Ca⁺² and Mg⁺² to the values below 1 ppm.

Novelty: Two groups of parameters are defined prior to estimation: kinetic and thermodynamic. Thermodynamic parameters are estimated on the base of static discharges. The selected kinetic parameters are estimated using pulse (dis-)charge experiments, preceded by the sensitivity analysis

This paper presents a hybridized triboelectric-electromagnetic generator based on heaving point absorbers to harvest the energy of water waves. The device consists of a cylindrical freestanding grating triboelectric generator (TENG) and a tubular electromagnetic generator. The performance of the TENG and electromagnetic generator units and corresponding electrical outputs are evaluated under various dynamical and electrical conditions. For the first time, the effect of irregular wave motion on the TENG harvester performance is systematically explored using a well-known wave spectrum.

The decreased electrochemical/thermal performance of the overcharged lithium iron phosphate battery has been investigated, and the root cause is attributed to the crystal structure destruction and electrode materials aggregation.

Novelty:

• The initial reaction mechanism and factors of pyrolysis of brown coal and gasification of coal-water slurry.
• The first time of simulations of gasification of coal-water slurry with reactive force field.
• The influences of mass fraction on the gas releasing rules and characters on gasification of coal-water slurry.

1%(Pt-Rh)/TiO₂/C catalyst shows the high HI decomposition activity even under the wet condition, long-term stability, and stability in structure of catalyst. The stable HI conversion is exhibited over 300 hours.

A quantum dot (QD)/2,5-diphenyloxazole radioluminescent nuclear battery was developed; its luminescence mechanism was studied. The significant improvement in the optical and electrical properties of the radioluminescent nuclear battery mainly due to QDs regulates the RL spectra. Perovskite QDs also has excellent application prospects for the (α, β, γ, and X-ray sources) radioluminescent nuclear battery and X-ray imaging technology. This paper presents the results and laws of scientific, which is inside the scope of International Journal of Energy Research.

Three-dimensional simulations of a pilot-scale EPCM-based TES system were conducted. The internal void space and natural convection within the molten PCM influenced the storage characteristics. Eighty percent of the supplied energy was stored in the capsules of which 20% is attributed to the latent heat storage. Strong agreement between the numerical and experimental works demonstrates that the methods employed can predict the behavior an EPCM-based system, and therefore it can be used to further design and optimize EPCM-based latent heat TES systems.

This study is concerning CO₂ sequestration in depleted water-saturated methane hydrate samples. One approach considers both CO₂ sequestration and the use of depleted hydrate reservoirs. That can help find key factors influencing CO₂ storage as hydrate form in the depleted water-saturated methane hydrate mines.

A Monte Carlo radioisotope source model using PENELOPE was developed in order to take into account the self-absorption of beta particles, and a form factor approach was used to optimize various metal tritide source thicknesses by reducing self-absorption. A beryllium tritide source has a very low density of 0.65 g/cm³, but a relatively moderate volumetric specific activity of approximately 2510 Ci/cm³ produced a power output of approximately 4 mW/cm³, which is approximately 1.3 times higher than that of titanium tritide.

This study aims at optimization of concentric recuperator structure to guarantee the stable operation of PbLi loop DRAGON-V. According to the comparison among different structures, the results show that the stress intensity increased with bending radius R and decreased with tangent angle θ, with a little influence on heat transferring and deformation. Also, structural strength satisfies the design requirement.