Sustainable high‐entropy ceramics for reversible energy storage: A short review

Abstract

Research on high‐entropy ceramics (HEC) is rapidly expanding; the myriad of unexplored compositions creates unique opportunities. Compared to the state of the art materials, HECs have shown favorable improvement on the long‐term stability and durability of secondary batteries (i.e., Li, Na, K, and S). This short review summarizes the recent (2015‐2020) progress done in the field of HECs for reversible energy storage (26 peer reviewed papers); it gives an overview on materials chemistry, reactivity/synthesis, processing routes, electrochemical performance, and applications. It also surveys 18 patents to trace the growing technological interest. The charge and discharge performance are analyzed and compared with reference established materials.

Sintering temperature dependency on sodium‐ion conductivity for Na2Zn2TeO6 solid electrolyte

“…σ total shows the maximum (=4.0 × 10 −4 S cm −1 ) in the samples sintered at 750℃, which is 100℃ lower than the condition in previous works 6−11 . Such low sintering temperature compared to other Na‐based oxide solid electrolytes could be useful for co‐sintering with electrode active materials with similar layered structure for fabricating oxide‐based all‐solid‐state SiBs 19−24 . Even for the sample sintered at the lowest temperature of 650℃, σ total = 2 × 10 −4 S cm −1 was obtained.…”

“…The error made on this percentage is about 5%-10%.The mineral phase this sintering temperature may be still high not only for the Na volatilization in the precursor, 10,11 but also for cosintering with electrode active materials with similar layered structure for fabricating oxide-based solid-state Na batteries. [19][20][21][22][23][24] In this study, we investigated the sintering temperature dependency on the properties of NZTO. We controlled the sintering temperatures at 650−850℃ and found that all sintered samples show Na-ion conductivity above 10 −4 S cm −1 at room temperature.…”

“…In the previous works, sintering temperatures of NZTO were commonly set to 850–900℃ 6–11 . However, this sintering temperature may be still high not only for the Na volatilization in the precursor, 10,11 but also for co‐sintering with electrode active materials with similar layered structure for fabricating oxide‐based solid‐state Na batteries 19–24 . In this study, we investigated the sintering temperature dependency on the properties of NZTO.…”

High entropy metal chalcogenides: synthesis, properties, applications and future directions

“…Since the advent of inorganic HE materials, there have been numerous reports of HE metal oxides comprising of combinations of alkali, alkali-earth, transition, main group and even lanthanide metals. 35,[40][41][42][43][44][45] These materials have been investigated in a wide range of applications, mainly in the energy 44 and catalysis 40,43 fields. Due to this, far more work on HE metal oxides has been reported than for the sulphides, selenides and Fig.…”

Evaluation of Entropy‐Stabilized (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O Oxides Produced via Solvothermal Method or Electrospinning as Anodes in Lithium‐Ion Batteries

“…The ESM family includes alloys, [ 1,2 ] oxides, [ 9 ] and other composites, [ 10–15 ] which exhibit a variety of structures (rock‐salt, spinel, perovskite, fluorite…) and are endowed with enhanced properties that make them very promising candidates for a very wide range of applications, spanning from catalysis [ 16–24 ] to energy conversion and storage. [ 25–38 ]…”