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arXiv · 1410.4223

Manganese reduction/oxidation reaction on graphene composites as a reversible process for storing enormous energy at a fast rate

Yanyi Chen·Chengjun Xu·Shan Shi·Jia Li·Feiyu Kang·Chunguang Wei
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Abstract

Oxygen reduction/evolution reaction (ORR/OER) is a basic process for fuel cells or metal air batteries. However, ORR/OER generally requires noble metal catalysts and suffers from low solubility (10-3 molar per liter) of O2, low kinetics rate (10-6 cm2/s) and low reversibility. We report a manganese reduction/oxidation reaction (MRR/MOR) on graphene/MnO2 composites, delivering a high capacity (4200 mAh/g), fast kinetics (0.0024 cm2/s, three orders higher than ORR/OER), high solubility (three orders than O2), and high reversibility (100%). We further use MRR/MOR to invent a rechargeable manganese ion battery (MIB), which delivers an energy density of 1200 Wh/Kg (several times of lithium ion battery), a fast charge ability (3 minutes), and a long cycle life (10,000 cycles). MRR/MOR renders a new class of energy conversion or storage systems with a very high energy density enabling electric vehicles run much more miles at one charge.

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Yanyi Chen, Chengjun Xu, Shan Shi, Jia Li, Feiyu Kang, Chunguang Wei. 2014-10-11. Manganese reduction/oxidation reaction on graphene composites as a reversible process for storing enormous energy at a fast rate. https://arxiv.org/abs/1410.4223

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