NiCo 2 O 4 bricks as anode materials with high lithium storage property
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.169
NiCo2O4 bricks as anode materials with high lithium storage property Hui Wang1#, Youning Gong1#, Delong Li1, Qiang Fu2, Chunxu Pan1,2* 1 School of Physics and Technology, and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China.
2
Center for Electron Microscopy, Wuhan University, Wuhan 430072, China.
#
Hui Wang and Youning Gong contribute equally to the article.
E-mail: [email protected] (C. Pan); Tel: +86-27-68752481 ext. 8031
ABSTRACT
In this study, a novel brick-like NiCo2O4 material was synthesized via a facile hydrothermal method. The as-prepared NiCo2O4 material possessed high porosity with the BET specific surface area of 58.33 m2/g, and its pore size distribution was in a range of 5-15 nm with a dominant pore diameter of 10.7 nm. The electrochemical performance of the NiCo 2O4 was further investigated as anode material for lithium-ion battery. The NiCo2O4 anode possessed a high lithium storage capacity up to 2353.0 mAh/g at the current density of 100 mA/g. Even at the high rate of 1 A/g, a reversible capacity of ~600 mAh/g was still retained, and an average discharge capacity of ~1145 mAh/g could be recovered when the current density was reduced back to 150 mA/g. Due to the simple and cost-effective process, the NiCo2O4 bricks anode material shows great potential for further large-scale applications on the area of lithium-ion battery.
INTRODUCTION With the limited availability of fossil fuels and fast energy consumption/production, there has been an increasing and urgent demand for exploring new energy conversion and storage systems with highly efficiency [1-3]. Lithium-ion batteries (LIBs), with
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considerable specific energy, high efficiency and light weight, have already become the main power sources for the consumer electronics with a production of the order of billions of units per year [4,5]. Furthermore, LIBs are also expected to play a prominent role in renewable energy systems for sustainable vehicles, such as hybrid and electric vehicles [4-6]. As the key component of LIBs, electrode materials determine their main electrochemical performance including the capacity, energy density and cyclability [7-9]. Graphite is a commonly used commercial anode material of LIBs due to its abundance and electrochemical stability [6,10]. However, the further development of graphite anodes is extremely limited due to its low theoretical capacity of carbonaceous materials (372 mAh/g) [10]. Therefore, it is highly desirable to develop an advanced anode material to satisfy the demand of high capacity and energy density for LIBs. Recently, transition metal oxides (TMOs) have drawn great attentions due to their high lithium storage capacity [8
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