AI Article Synopsis
- Magnesium rechargeable batteries (MRBs) are emerging as a promising alternative to lithium-ion batteries, providing high energy storage with better safety and cost efficiency.
- Researchers have created an ultraporous cubic spinel MgMnO (MMO) using a novel freeze-dry process, which initially has a discharge capacity of 160 mAh/g.
- After heat treatment to remove surface hydroxy groups, the discharge capacity improved to 270 mAh/g, reaching its theoretical capacity and enhancing the battery's efficiency by stabilizing the cubic spinel phase for better magnesium ion movement.
Article Abstract
Magnesium rechargeable batteries (MRBs) promise to be the next post lithium-ion batteries that can help meet the increasing demand for high-energy, cost-effective, high-safety energy storage devices. Early prototype MRBs that use molybdenum-sulfide cathodes have low terminal voltages, requiring the development of oxide-based cathodes capable of overcoming the sulfide's low Mg conductivity. Here, we fabricate an ultraporous (>500 m g) and ultrasmall (<2.5 nm) cubic spinel MgMnO (MMO) by a freeze-dry assisted room-temperature alcohol reduction process. While the as-fabricated MMO exhibits a discharge capacity of 160 mAh g, the removal of its surface hydroxy groups by heat-treatment activates it without structural change, improving its discharge capacity to 270 mAh g─the theoretical capacity at room temperature. These results are made possible by the ultraporous, ultrasmall particles that stabilize the metastable cubic spinel phase, promoting both the Mg insertion/deintercalation in the MMO and the reversible transformation between the cubic spinel and cubic rock-salt phases.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9933879 | PMC |
| http://dx.doi.org/10.1021/acsnano.2c12392 | DOI Listing |
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