High Cycle Stability of Hybridized Co(OH)2 Nanomaterial Structures Synthesized by the Water Bath Method as Anodes for Lithium-Ion Batteries.

Longlong Ren,Yufeng Qin,Linhui Wang,Qiang Li

doi:10.3390/mi13020149

Longlong Ren, Yufeng Qin + Show 2 more

Open Access

https://doi.org/10.3390/mi13020149

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Abstract

Cobalt oxides have been intensely explored as anodes of lithium-ion batteries to resolve the intrinsic disadvantages of low electrical conductivity and volume change. However, as a precursor of preparing cobalt oxides, Co(OH)2 has rarely been investigated as the anode material of lithium-ion batteries, perhaps because of the complexity of hydroxides. Hybridized Co(OH)2 nanomaterial structures were synthesized by the water bath method and exhibited high electrochemical performance. The initial discharge and charge capacities were 1703.2 and 1262.9 mAh/g at 200 mA/g, respectively. The reversible capacity was 1050 mAh/g after 150 cycles. The reversible capability was 1015 mAh/g at 800 mA/g and increased to 1630 mAh/g when driven back to 100 mA/g. The electrochemical reaction kinetics study shows that the lithium-ion diffusion-controlled contribution is dominant in the energy storage mechanism. The superior electrochemical performance could result from the water bath method and the hybridization of nanosheets and nanoparticles structures. These hybridized Co(OH)2 nanomaterial structures with high electrochemical performance are promising anodes for lithium-ion batteries.

Highlights

To solve the problems of growing exhaustion of fossil energy and the resulting environmental issues, many energy conversion and storage systems, such as lithium-ion batteries (LIBs), nanogenerators, and supercapacitors, have been extensively investigated [1,2,3,4,5,6,7,8,9,10,11,12,13]
LIBs have attracted much attention owing to their low self-discharge, no memory effect, high working voltage, and high energy density [14,15,16,17,18,19]
Performance firmed using a scanning electron microscope (SEM, Gemini SEM300, Zeiss, Oberkochen, The electrochemical performance and impedance characteristics were tested on a Germany). battery testing system (Land-ct2001A, LanHe, Wuhan, China) and electrochemical workstation (CHI660E, ChenHua, Shanghai, China) at room temperature in the potential range of

Summary

Introduction

To solve the problems of growing exhaustion of fossil energy (petroleum, natural gas, and coal) and the resulting environmental issues, many energy conversion and storage systems, such as lithium-ion batteries (LIBs), nanogenerators, and supercapacitors, have been extensively investigated [1,2,3,4,5,6,7,8,9,10,11,12,13]. Li et al prepared Co(OH)2 /Co3 O4 /Co nanoparticle anodes, which showed a high reversible capacity of 540 mAh/g after 300 cycles with no obvious attenuation due to the hybridized effect of Co3 O4 and Co(OH)2 [28]. Based on the above reports, even though high initial discharge capacities were observed, the cycle stability and the rate capability of the Co(OH) nanomaterials should be further enhanced to meet the demands of practical application. We designed and prepared by the water bath method hybridized Co(OH) nanomaterial structures, which exhibit outstanding electrochemical performance as anodes for LIBs. The initial discharge and charge capacities were 1703.2 and 1262.9 mAh/g at. The superior electrochemical performance could result from the water bath method used and the hybridization of nanosheet and nanoparticle structures These hybridized Co(OH) nanomaterial structures with high electrochemical performance are promising anodes for lithium-ion batteries

Materials and Methods

Structure and Morphology

Electrochemical Performance Characterization

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