Here we present novel (Mg _0.2 Ti _0.2 Zn _0.2 Cu _0.2 Fe _0.2 ) ₃ O ₄ materials prepared via one-step solid state reaction method and subsequently high-energy ball-milling. When used as anodes for LIBs, it exhibits superior lithium storage properties.

A series of (Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)O electrodes with different particle sizes were prepared and tested, which presented excellent lithium-storage performance.

Conventionally, the magnetic core in an inductive power transfer (IPT) system is spliced by pieces of ferrites, which is time-consuming and unable to realize a seamless fit on the curved surface. This letter proposes a compact curved coupler with a novel flexible nanocrystalline flake ribbon (NFR) magnetic core. Compared with ferrite core, the NFR not only enhances the application flexibility of the IPT system but also significantly reduces its weight in certain power. Based on the LCC -S compensation topology, a 1 kW IPT prototype for autonomous underwater vehicles is fabricated. The transmission characteristics and temperature performance of the system have been investigated under three power levels, considering various permeability values for NFR cores. Finally, the NFR with a permeability of 800 is chosen as the magnetic core, and the dc–dc system efficiency reaches 92.85%. Moreover, it is possible to restrict the maximum temperature to 54.1 °C, and the weight of the NFR cores accounts for merely 4.65% of the whole coupler.

This paper examines the performance of a 13kW high-power inductive power transfer system utilising a hybrid core structure with novel nanocrystalline ribbon cores and nanocrystalline flake ribbons. Conventional laminated nanocrystalline ribbon cores exhibit excessive edge losses due to high flux density concentrated on the edge and high eddy current losses in the lateral wall, potentially causing partial thermal runaway. To mitigate this issue, the solution is proposed to employ nanocrystalline flake ribbons as a shielding material on the edge while maintaining the nanocrystalline ribbon core as the main magnetic coupler. The performance of the hybrid core is evaluated under different power levels up to 13.8 kW. Experimental results reveal a nearly 2% increase in peak efficiency compared to the ferrite DMR44 and a 1% increase compared to standalone nanocrystalline ribbon cores, bringing the peak DC-DC efficiency to over 96%. Moreover, under 6.6 kW output power, the temperature rise after 2-hour operation is significantly reduced to a maximum temperature of 76.5°C with the proposed hybrid core, compared to 96.4°C with the ferrite shield and 110.6°C without any edge shield. The design highlights using nanocrystalline material in inductive power transfer systems to improve efficiency and thermal performance.

Dynamic wireless charging (DWC) technology can help alleviate the problem of short driving range for battery-powered vehicles. In this article, a model predictive control (MPC) is applied to the buck converter on the secondary side of a DWC system to address fast output fluctuations. This approach features a fast-dynamic response, and no communication link is required. To solve the key issue of MPC, which is the computational burden, a polynomial fitting method based on the parsing solution of the sampled-data model is proposed. The complex matrix exponential calculation is replaced by simple polynomial operations, and the optimal duty cycle can be calculated directly by solving a quadratic function. This significantly reduces the computational burden. A DWC experimental setup is constructed, and results show that the proposed MPC has a better dynamic performance compared to proportional-integral control. The adjustment time is only 140 μs (around seven switching cycles) when the reference voltage is stepping. Moreover, the computational burden for matrix calculation in two-step prediction can be reduced by 50.6% and 79.7% compared to the lookup table and Taylor series approximation, respectively. Meanwhile, MPC with current limitation is analyzed and demonstrates a neat spectrum, small ripple but large response time.