Boron doped graphene nanosheets as negative electrode additive for high-performance lead-acid batteries and ultracapacitors

Naresh, Vangapally and Bhattacharjee, Udita and Martha, Surendra Kumar (2019) Boron doped graphene nanosheets as negative electrode additive for high-performance lead-acid batteries and ultracapacitors. Journal of Alloys and Compounds. ISSN 09258388

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Abstract

Sulfation at the negative electrode is one of the major failure modes of lead-acid batteries. To overcome the issues of sulfation, in this work we synthesize Boron doped graphene nanosheets as an efficient negative electrode additive for lead-acid batteries. 0.25 wt % Boron doped graphene nanosheets additive in negative electrode which contains around 3% of Boron doping shows impressive electrochemical performance in first discharge capacity, ∼60% increase the capacity in relation to the conventional lead-acid cell. Noticeably, 15–20% enhancement in the discharge capacity at lower C rates and almost double increase in capacity at higher C rates show Boron doped graphene nanosheets as a potential additive for lead-acid battery operating under high rate partial state of charge applications. The superior electrochemical performance is due to the p-type or hole conductivity of the Boron doped graphene lattice, which reduces lead sulfate formation and thereby enhances active material utilization, charge acceptance, and reduces hydrogen evolution. Besides, the high C-rate performance of Boron doped graphene nanosheets additive cell is due to the capacitive property of Boron-doped graphene nanosheets which delivers specific capacitance of 90 F g−1 at 2 A g−1 with >75% capacity retention at the end of 2000 cycles.

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IITH Creators:
IITH CreatorsORCiD
Martha, Surendra KumarUNSPECIFIED
Item Type: Article
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 10 May 2019 04:02
Last Modified: 10 May 2019 04:02
URI: http://raiith.iith.ac.in/id/eprint/5108
Publisher URL: http://doi.org/10.1016/j.jallcom.2019.04.311
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