High-entropy materials (HEMs) have emerged as promising frontiers in electrochemical energy storage systems because of their unique compositional versatility and tunable physicochemical properties. By incorporating multiple principal elements with distinct chemical functionalities, HEMs exhibit tailored electronic/ionic configurations, enabling unprecedented structural adaptability and application potential. This review systematically analyzes the fundamental principles underpinning the entropy-driven optimization of the electrochemical performance of battery materials, with a focus on the interplay between compositional disorder and functional enhancements. For the first time, we comprehensively review recent advances in Na superionic conductor (NASICON)-type HEMs spanning cathodes, solid-state electrolytes, and anodes. Through investigations, the profound impacts of high-entropy strategies on critical material parameters, including lattice strain modulation, interfacial stability reinforcement, charge-transfer kinetics optimization, and ion transport pathway regulation, were elucidated. Furthermore, we evaluate the current challenges in high-entropy NASICON-type battery design and propose actionable strategies for advancing next-generation high-entropy battery systems, emphasizing rational compositional screening, entropy-stabilized interface design, and machine learning-assisted property prediction.

The exploration of high-performance dielectric ceramics with dielectric constants lower than 10 is of great significance for the next generation of wireless communication. In this study, we reported the Yb₂Si₂O₇ (YSO) dielectric ceramics synthesized using a facile solid-state reaction technique. X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization confirmed that YSO ceramics had a monoclinic structure. At a sintering temperature of 1500 °C, the sintered sample reached a maximum relative density of 96% and demonstrated the best dielectric properties: dielectric constant (ε_r) = 7.57, Q×f = 78,645 GHz (Q is quality factor, and f is the resonant frequency of 13.5 GHz), andtemperature coefficient of the resonant frequency (τ_f) = −13.5 ppm/°C. Moreover, Raman analysis revealed that the Si–O bond dominated the lattice vibration, and the full width at half maximum (FWHM) of the strong peak at 922 cm⁻¹ was inversely proportional to the Q×f value. According to the Phillips–van Vechten–Levine (P–V–L) theory, the values of Q×f and τ_f are affected primarily by the Si–O bond, while ε_r is influenced mainly by the Yb–O bond. YSO ceramics demonstrated excellent dielectric properties in the terahertz band (ε_r = 8.13, Q×f = 112,758 GHz), making them promising candidates for future applications in the terahertz band.

Garnet-type Li₇La₃Zr₂O₁₂ (LLZO) is one of the most promising solid-state electrolytes (SSEs). However, the application of LLZO is limited by structural instability, low ionic conductivity, and poor lithium stability. To obtain a garnet-type solid electrolyte with a stable structure and high ionic conductivity, a series of TaCe co-doping cubic Li_6·4La₃ZrTa_0.6CeO₁₂ (LLZTCO, x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.20, 0.30) electrolytes were successfully synthesized through conventional solid-phase method. The Ta⁵⁺ doping can introduce more lithium vacancies and effectively maintain the stability of the cubic phase. The Ce⁴⁺ with a larger ionic radius is introduced into the lattice to widen the Li⁺ migration bottleneck size, which significantly increased the ionic conductivity to 1.05 × 10⁻³ S/cm. It also shows excellent stability to lithium metal by the optimization of Li⁺ transport channel. Li||LLZTCO||Li symmetric cells can cycle stably for more than 6 000 h at a current density of 0.1 mA/cm² without any surface modifications. The commercialization potential of LLZTCO samples in all solid-state lithium batteries (ASSLBs) is confirmed by the prepared LiFePO₄||LLZTCO||Li cells with a capacity retention rate of 98% after 100 cycles at 0.5C. This new co-doping method presents a practical solution for the realization of high-performance ASSLBs.

Sr_0.7Bi_0.2TiO₃ (SBT) by increasing the proportion and size of polar nano-region. Meanwhile, the BDS remains a high level with x ≤ 0.38 attributed to the addition of KBT with a large band gap. As a result, the 0.62SBT-0.38KBT exhibits a high energy storage density of 2.21 J/cm³ with high η of 91.4% at 220 kV/cm and superior temperature stability (−55 ~ 150 °C), frequency stability (10 ~ 500 Hz) and fatigue resistance (10⁵ cycles). Moreover, high pulsed discharge energy density (1.81 J/cm³), high power density (49.5 MW/cm³) and great thermal stability (20 ~ 160 °C) are achieved in 0.62SBT-0.38KBT. Based on these excellent properties, the 0.62SBT-0.38KBT are suitable for pulsed power systems. This work provides a novel strategy and systematic study for improving energy storage properties of SBT.