Excellently balanced water-intercalation-type heat-storage oxide

Takuya Hatakeyama, Norihiko L. Okamoto (), Satoshi Otake, Hiroaki Sato, Hongyi Li and Tetsu Ichitsubo ()
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Takuya Hatakeyama: Tohoku University, 2-1-1 Katahira, Aoba-ku
Norihiko L. Okamoto: Tohoku University, 2-1-1 Katahira, Aoba-ku
Satoshi Otake: Rigaku Corporation, 3-9-12 Matsubara-cho
Hiroaki Sato: Rigaku Corporation, 3-9-12 Matsubara-cho
Hongyi Li: Tohoku University, 2-1-1 Katahira, Aoba-ku
Tetsu Ichitsubo: Tohoku University, 2-1-1 Katahira, Aoba-ku

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Importance of heat storage materials has recently been increasing. Although various types of heat storage materials have been reported to date, there are few well-balanced energy storage materials in terms of long lifetime, reversibility, energy density, reasonably fast charge/discharge capability, and treatability. Here we report an interesting discovery that a commonly known substance, birnessite-type layered manganese dioxide with crystal water (δ-type K0.33MnO2 ⋅ nH2O), exhibits a water-intercalation mechanism and can be an excellently balanced heat storage material, from the above views, that can be operated in a solid state with water as a working pair. The volumetric energy density exceeds 1000 MJ m−3 (at n ~ 0.5), which is close to the ideally maximum value and the best among phase-change materials. The driving force for the water intercalation is also validated by the ab initio calculations. The proposed mechanism would provide an optimal solution for a heat-storage strategy towards low-grade waste-heat applications.

Date: 2022
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DOI: 10.1038/s41467-022-28988-0

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