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Author

Han Jun Kim

Other affiliations: Korea University
Bio: Han Jun Kim is an academic researcher from Korea Institute of Science and Technology. The author has contributed to research in topics: Electrode & Cathode. The author has an hindex of 1, co-authored 1 publications receiving 2 citations. Previous affiliations of Han Jun Kim include Korea University.

Papers
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TL;DR: In this article, an electrochemically activated Na/ZnCl2 battery using less-expensive carbon felt to maintain efficient electron percolation in the cathode and evaluates the charge-discharge behavior and cell impedance.

5 citations


Cited by
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TL;DR: In this article, the authors focus on sodium metal halide (Na-MH) batteries, such as the well-known Na-NiCl2 battery, as a promising solution to safe and economical grid-level energy storage.
Abstract: Transitioning from fossil fuels to renewable energy sources is a critical goal to address greenhouse gas emissions and climate change. Major improvements have made wind and solar power increasingly cost-competitive with fossil fuels. However, the inherent intermittency of renewable power sources motivates pairing these resources with energy storage. Electrochemical energy storage in batteries is widely used in many fields and increasingly for grid-level storage, but current battery technologies still fall short of performance, safety, and cost. This review focuses on sodium metal halide (Na-MH) batteries, such as the well-known Na-NiCl2 battery, as a promising solution to safe and economical grid-level energy storage. Important features of conventional Na-MH batteries are discussed, and recent literature on the development of intermediate-temperature, low-cost cathodes for Na-MH batteries is highlighted. By employing lower cost metal halides (e.g., FeCl2, and ZnCl2, etc.) in the cathode and operating at lower temperatures (e.g., 190 °C vs. 280 °C), new Na-MH batteries have the potential to offer comparable performance at much lower overall costs, providing an exciting alternative technology to enable widespread adoption of renewables-plus-storage for the grid.

13 citations

Journal ArticleDOI
TL;DR: In this paper , a mechanochemically prepared orthorhombic NaAlCl4 is demonstrated to exhibit a 10-fold enhancement in Na+ conductivity (3.9 × 10−6 S cm−1 at 30 °C) compared to annealed samples.
Abstract: Although high-voltage-stable halide solid electrolytes (SEs) have emerged, only a few Na+ halide SEs have been developed thus far. Moreover, the use of expensive elements reduces the suitability of all-solid-state Na-ion batteries (ASNBs). Herein, the new mechanochemically prepared orthorhombic NaAlCl4 is demonstrated to exhibit a 10-fold enhancement in Na+ conductivity (3.9 × 10–6 S cm–1 at 30 °C) compared to annealed samples. The feasibility of NaAlCl4 for ASNBs is also validated for the first time. X-ray Rietveld refinement with bond valence energy landscape calculations reveals 1D-preferable 2D Na+ conduction pathways. High-voltage stability up to ∼4.0 V (vs Na/Na+) is confirmed by electrochemical measurements and theoretical calculations. Furthermore, the outstanding electrochemical performance of NaCrO2/Na3Sn ASNBs at 30 and 60 °C is demonstrated (e.g., 82.9% capacity retention at the 500th cycle at 60 °C and 1C), shedding light on the potential of the cost-effective and safe energy storage systems.

4 citations

Journal ArticleDOI
TL;DR: In this article, three-dimensional network carbon felt via microwave oxidation was used as ZnO support and filled with 30% H2O2-oxidised activated carbon to improve the performance of the battery.
Abstract: The formation of negative zinc dendrite and the deformation of zinc electrode are the important factors affecting nickel–zinc battery life. In this study, three-dimensional (3D) network carbon felt via microwave oxidation was used as ZnO support and filled with 30% H2O2-oxidised activated carbon to improve the performance of the battery. The energy density and power density of the nickel–zinc battery reached 81.8 and 181.7 Wh kg−1, respectively, at the first cycle of the charge and discharge. The coulomb efficiency and voltage efficiency of the battery were respectively 85% and 65.5% at the 921st cycle. The coulomb efficiency and voltage efficiency of the battery filled with 30% H2O2-oxidised activated carbon were respectively increased by 0.8% and 2.6% compared with those of the nickel–zinc battery filled with activated carbon, and by 31.2% and 6.9% compared with those of the nickel–zinc battery without the activated carbon. The adhesion between carbon felt and zinc was strengthened by polar groups, and the specific capacitance and hydrophilicity of zinc electrode were improved by filling the zinc electrode with 30% H2O2-oxidised activated carbon. Moreover, the hydrophilicity of carbon felt support and activated carbon capacitor material can promote the penetration and diffusion of electrolyte in the electrode and help eliminate zinc dendrite. The carbon felt electrode has the flexibility to avoid deformation of zinc electrode. The cycle stability of the battery was considerably improved by 935 times.

2 citations

Journal ArticleDOI
TL;DR: The rechargeable high-temperature molten salt electrolyte-based battery (HT-MSB) is a promising approach for large-scale electrochemical energy storage using low-cost and earth-abundant materials as discussed by the authors .
Abstract: The rechargeable high-temperature molten salt electrolyte-based battery (HT-MSB) is a promising approach for large-scale electrochemical energy storage using low-cost and earth-abundant materials. Solid electrolyte membranes have been adoped in a...

1 citations