DataVXACS Applied Energy MaterialsPaper
journal article·2021-08-23

Effects of the Nb2O5-Modulated Surface on the Electrochemical Properties of Spinel LiMn2O4 Cathodes

Hongxiang Ji, Liubin Ben, Shan Wang, Zhongzhu Liu, Robson Monteiro, Rogerio Ribas, Hailong Yu, Peng Gao, Yongming Zhu, Xuejie Huang

ACS Applied Energy Materials· Volume 4· Issue 8
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Source abstract

Abstract

Nb2O5 has attracted substantial attention because of its effectiveness in improving the capacity retention and rate capability of cathode materials. However, modulating the interactions between Nb2O5- and Mn-contained cathode materials is the key to the success of the cycling performance. In this paper, we investigated the general and atomic-level structural interactions between the LiMn2O4 spinel cathode material and 0.5–3 wt % Nb2O5. The results showed that Nb2O5 was predominately bond on the surface of the LiMn2O4 spinel cathode by carefully controlled coating concentration and temperature (e.g., 0.5 wt % at 500 °C). In this case, a significantly improved electrochemical performance was obtained, even during cycling at 55 °C or between 3 and 5.1 V. In contrast, Nb5+ ions diffused into the cathode structure at a high coating concentration, and the temperature was charge compensated by the generation of more Mn3+ ions. This caused severe Jahn–Teller distortion during cycling and consequently decreased the cycling performance.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

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

Affiliations

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Songshan Lake Mat Lab, Dongguan 523808, Guangdong, People’s Republic of China

School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150006, China

Department of Applied Chemistry, Harbin Institute of Technology at Weihai, Weihai 264209, China

CITC Metal, Room 1901, Chaoyang District, Beijing 122099, China

Companhia Brasileira de Metalurgia e Mineração, Gerais 38183-903, Brazil

Funding

National Key R&D Program of China · Applications of Niobium in high Ni NCM811 Cathode Materials for Lithium ion Batteries of CITC-metal/CBMM

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