High-Entropy and Multiphase Cathode Materials for Sodium-Ion Batteries

IF 24.4 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Ranran Li, Xuan Qin, Xiaolei Li, Jianxun Zhu, Li-Rong Zheng, Zhongtao Li, Weidong Zhou
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Abstract

Cycling stability is the biggest challenge for cathodes of sodium-ion batteries (SIBs), which is directly affected by the structure design. Herein, the combination of high-entropy (HE) and multiphase structure is demonstrated to be helpful for maintaining the structure and improving the cycling stability. In the Ni/Mn/Cu/Ti/Sn five-component HE multiphase cathode, the multiple elements at transition metal sites can enlarge the lattice and stabilize the structure simultaneously without causing an obvious capacity drop, achieving the synergistic effect of multi-cations. In the HE cathodes consisting of P2 and O3 phases, the harmful phase transition in high-voltage is suppressed and the cycling performance is improved. A capacity retention of 77.3 mAh g−1 after 300 cycles is delivered, and an improved rate performance of 88.7 mAh g−1 at 750 mA g−1 is observed, better than that of the low-entropy multiphase cathode(P2 and O3) and the HE oxide single O3-phase cathode. The weighted average ionic radius(WAIR) of all transition metals is demonstrated critical for the formation of the phase composition in HE composites. Through comparing a series of HE and multiphase cathodes, an empirical range of WAIR is obtained, which shows guidance for the design of other cathode materials.

Abstract Image

Abstract Image

用于钠离子电池的高熵和多相阴极材料
循环稳定性是钠离子电池(SIB)阴极面临的最大挑战,它直接受到结构设计的影响。本文证明了高熵 (HE) 和多相结构的结合有助于保持结构和提高循环稳定性。在 Ni/Mn/Cu/Ti/Sn 五组分 HE 多相阴极中,过渡金属位点上的多种元素可同时扩大晶格和稳定结构,而不会造成明显的容量下降,实现了多阳离子的协同效应。在由 P2 相和 O3 相组成的 HE 阴极中,高压下的有害相变被抑制,循环性能得到改善。循环 300 次后的容量保持率为 77.3 mAh g-1,750 mA g-1 时的速率性能为 88.7 mAh g-1,优于低熵多相阴极(P2 和 O3)和 HE 氧化物单 O3 相阴极。所有过渡金属的加权平均离子半径(WAIR)对 HE 复合材料中相组成的形成至关重要。通过比较一系列 HE 和多相阴极,得出了 WAIR 的经验范围,为设计其他阴极材料提供了指导。
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来源期刊
Advanced Energy Materials
Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
41.90
自引率
4.00%
发文量
889
审稿时长
1.4 months
期刊介绍: Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.
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