Single cobalt atoms help zinc–manganese batteries last 15,000 cycles

The modified cathode supported reversible manganese reactions and a reported capacity of 658 mAh per gram over more than 15,000 cycles.

Editorial illustration — not from the study.

Researchers introduced isolated cobalt atoms into layered manganese dioxide, creating a cathode material for aqueous zinc–manganese batteries. They report that the cobalt changes the local structure and oxygen chemistry of the material, helping manganese compounds take part in reversible charge storage without added acid or a redox mediator.

The resulting battery reached a reported capacity of 658 mAh per gram and operated for more than 15,000 cycles. The researchers attribute this performance to a two-step process in which manganese stores and releases three electrons through two reversible reactions.

What the cobalt changed

The researchers embedded isolated cobalt atoms in layered manganese dioxide, producing a material they call Co–MnO2. They report that the cobalt atoms altered the symmetry of the manganese–oxygen units, reduced the covalent character of cobalt–oxygen bonds and increased the activity of oxygen in the crystal lattice.

According to the abstract, high-spin cobalt reduced structural distortions in the manganese dioxide and helped deposited manganese dioxide fully convert from adsorbed manganese ions. This was intended to limit inactive manganese deposits, sometimes described as “dead” manganese dioxide, and avoid manganese dendrites. The cathode supported reversible manganese dioxide/manganese(III) and manganese dioxide/manganese(II) reactions.

The researchers describe the battery chemistry as a “two-step, three-electron” mechanism. A zinc//Co–MnO2 battery reached 658 mAh g−1 and lasted for more than 15,000 cycles, according to the abstract.

Why the chemistry matters

Aqueous zinc–manganese batteries can be affected by irreversible changes in manganese compounds during cycling. The reported cobalt-based cathode addresses that problem by supporting reversible reactions involving more than one electron and by helping deposited manganese material return to an active form without added acid or a redox mediator. If the reported laboratory performance can be reproduced under practical operating conditions, this chemistry could inform the design of more durable, energy-dense zinc–manganese batteries.

Evidence and caveats

This is a journal research article reporting results from a zinc–manganese battery using a manganese dioxide cathode modified with isolated, high-spin cobalt atoms. The abstract describes the proposed chemical mechanism and battery performance, but it does not give the test conditions, comparison with other cathodes, or details about how the material performed outside laboratory cells. The reported cycle life and capacity therefore do not by themselves establish commercial durability or scalability.

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