Journal
MATERIALS
Volume 14, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ma14154134
Keywords
lithium manganese oxide; LiMn2O4; graphene oxide; cathode material; lithium ion battery
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The electrochemical performance of lithium manganese oxide composites with graphene oxide in Li-ion batteries was studied, showing that the composite with 5%wt. graphene oxide exhibited better capacity retention after cycling.
In this work, a facile, wet chemical synthesis was utilized to achieve a series of lithium manganese oxide (LiMn2O4, (LMO) with 1-5%wt. graphene oxide (GO) composites. The average crystallite sizes estimated by the Rietveld method of LMO/GO nanocomposites were in the range of 18-27 nm. The electrochemical performance was studied using CR2013 coin-type cell batteries prepared from pristine LMO material and LMO modified with 5%wt. GO. Synthesized materials were tested as positive electrodes for Li-ion batteries in the voltage range between 3.0 and 4.3 V at room temperature. The specific discharge capacity after 100 cycles for LMO and LMO/5%wt. GO were 84 and 83 mAh g(-1), respectively. The LMO material modified with 5%wt. of graphene oxide flakes retained more than 91% of its initial specific capacity, as compared with the 86% of pristine LMO material.
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