1D nanobar-like LiNi0.4Co0.2Mn0.4O2 as a stable cathode material for lithium-ion batteries with superior long-term capacity retention and high rate capability. Issue 30 (19th July 2017)

• Record Type: Journal Article
• Authors: Chen, Zhen; Chao, Dongliang; Liu, Jilei; Copley, Mark; Lin, Jianyi; Shen, Zexiang; Kim, Guk-Tae; Passerini, Stefano
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 30(2017)
• Page Start: 15669
• Page End: 15675
• Publication Date: 2017-07-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta02888a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : In this work is reported the successful synthesis of 1D nanobar-like LiNi0.4 Co0.2 Mn0.4 O2 (N-NCM), preferentially exposing the {010} electrochemically active facets. Abstract : In this work is reported the successful synthesis of 1D nanobar-like LiNi0.4 Co0.2 Mn0.4 O2 (N-NCM), preferentially exposing the {010} electrochemically active facets. The material is obtained via a precipitation process followed by a calcination step. Upon calcination at 800 °C, the material delivers a high initial reversible capacity of 177.1 mA h g −1 at 0.1C, while at higher current densities (1C, 2C, 5C and 10C), it still delivers 152.8, 141.7, 122.7 and 104.2 mA h g −1, respectively. After 100 cycles, the material exhibits high capacity retention values, ca. 91% (0.1C) and 94% (10C). The good electrochemical performance is attributed to the synthesis design strategy leading to 1D nanobars with exposed {010} electrochemically active facets, which provide a more open structure for unimpeded Li + migration. In addition, the diffusion pathway of lithium ions is greatly reduced because of the nano-sized bar shape. All these factors play a decisive role in achieving significantly enhanced lithium ion diffusivity, and thus superior high C-rate capability and greatly improved long-term cycling stability.