DataVXACS Applied Energy MaterialsPaper
journal article·2020-08-24

Achieving the Stable Structure and Superior Performance of Na3V2(PO4)2O2F Cathodes via Na-Site Regulation

Jing Liu, Lu-Lu Zhang, Xing-Zhong Cao, Xing Lin, Yue Shen, Peng Zhang, Cheng Wei, Yang-Yang Huang, Wei Luo, Xue-Lin Yang

ACS Applied Energy Materials· Volume 3· Issue 8
Publisher page
Source abstract

Abstract

Na3V2(PO4)2O2F (NVPOF) is considered as a promising cathode material for sodium-ion batteries due to its high structural stability and high average operating voltage (3.8 V). However, its low electronic conductivity and slow sodium-ion diffusion kinetics hinder its practical application. Here, an approach of Na-site regulation is proposed to adjust the intrinsic Na+ diffusion efficiency and electronic conductivity, thus improving the electrochemical performance of NVPOF. Guided by density functional theory calculations, we demonstrate that Na-site regulation can be subtly realized by accurate Li substitution on the Na2 site in NVPOF. The as-prepared Na2.75Li0.25V2(PO4)2O2F (NLVPOF) shows an increase of 1.53 and 1.55 times in rate capability and capacity retention (500 cycles) than NVPOF, respectively. Such a simple and effective Na-site regulation provides a new avenue in constructing advanced Li/Na-ion cathode materials.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

Funding

State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Department of Science and Technology, Hubei Provincial People's Government · National Natural Science Foundation of China · Ministry of Science and Technology of China

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