Preparation of LiMn<sub>2</sub>O<sub>4</sub> Graphene Hybrid Nanostructure by Combustion Synthesis and Their Electrochemical Properties

Dinesh Rangappa; Erabhoina Hari Mohan; Varma Siddhartha; Raghavan Gopalan; Tata Narasinga Rao; Dinesh Rangappa; Erabhoina Hari Mohan; Varma Siddhartha; Raghavan Gopalan; Tata Narasinga Rao

doi:10.3934/matersci.2014.4.174

AIMS Materials Science

2014, Volume 1, Issue 4: 174-183. doi: 10.3934/matersci.2014.4.174

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Preparation of LiMn₂O₄ Graphene Hybrid Nanostructure by Combustion Synthesis and Their Electrochemical Properties

1.
Department of Nanotechnology, Center for Post Graduate Studies, Bengaluru Region, VIAT, Muddenahalli, Chikkaballapur-562101 Visvesvaraya Technological University (VTU), Karnataka;
2.
International Advanced Research Centre for Powdered Metallurgy and New Materials (ARCI), Balapur, Hyderabad-500005, India

Received: 29 July 2014 Accepted: 14 October 2014 Published: 20 October 2014

The LiMn₂O₄ graphene hybrid cathode material has been synthesized by spray drying combustion process. The spinel structure cubic phase LiMn₂O₄ graphene hybrid material was prepared by spray drying process at 120 ℃ and subsequent heat treatment at 700 ℃ for 1 hour. The result indicates that the spinel shaped LiMn₂O₄ particles wrapped with graphene sheets were formed with particle size in the range of 60-70 nm. The charge-discharge measurement indicates that the LiMn₂O₄ graphene hybrid material shows an improved discharge capacity of 139 mAh/g at 0.1C rate. The pristine LiMn₂O₄ nano crystals present only about 132 mAh/g discharge capacity. The LiMn₂O₄ graphene hybrid samples show good cyclic performance with only 13% of capacity fading in 30 cycles when compared to the pristine LiMn₂O₄ that shows 22% of capacity fading in 30 cycles. The capacity retention of the LiMn₂O₄ graphene hybrid samples is about 10% higher than the pristine cycle after 30 cycles.
- Li ion battery,
- combustion method,
- LiMn₂O₄,
- reduced graphene
Citation: Dinesh Rangappa, Erabhoina Hari Mohan, Varma Siddhartha, Raghavan Gopalan, Tata Narasinga Rao. Preparation of LiMn2O4 Graphene Hybrid Nanostructure by Combustion Synthesis and Their Electrochemical Properties[J]. AIMS Materials Science, 2014, 1(4): 174-183. doi: 10.3934/matersci.2014.4.174

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Abstract

The LiMn₂O₄ graphene hybrid cathode material has been synthesized by spray drying combustion process. The spinel structure cubic phase LiMn₂O₄ graphene hybrid material was prepared by spray drying process at 120 ℃ and subsequent heat treatment at 700 ℃ for 1 hour. The result indicates that the spinel shaped LiMn₂O₄ particles wrapped with graphene sheets were formed with particle size in the range of 60-70 nm. The charge-discharge measurement indicates that the LiMn₂O₄ graphene hybrid material shows an improved discharge capacity of 139 mAh/g at 0.1C rate. The pristine LiMn₂O₄ nano crystals present only about 132 mAh/g discharge capacity. The LiMn₂O₄ graphene hybrid samples show good cyclic performance with only 13% of capacity fading in 30 cycles when compared to the pristine LiMn₂O₄ that shows 22% of capacity fading in 30 cycles. The capacity retention of the LiMn₂O₄ graphene hybrid samples is about 10% higher than the pristine cycle after 30 cycles.

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