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Researchers Develop Natural Diatomite Templating Hierarchical Solid State Li Metal Anodes with High Performance

Jun 11, 2019     Email"> PrintText Size

Lithium (Li) metal is one of the most attractive anode materials for next generation high energy density rechargeable batteries. For Li metal batteries (LMBs), uninflammable solid electrolytes (SEs) have been a good choice. However, the electrochemical performances of LMBs based on SEs are limited due to poor rigid solid-solid electrolyte/electrode contact.

A hierarchically structured solid Li metal composite anode could significantly address the interfacial issues for the large contact area and homogenized Li+ ion flux.

To realize a unique hierarchical framework material with low cost, good rigidity, high affinity to Li and enough pore spaces, in a study published in Nature Communations, a research team led by Prof. YAO Hongbin and Prof. YU Shuhong from the University of Science and Technology of China of the Chinese Academy of Sciences demonstrated a stable, dendritic free, and hierarchically structured Li metal composite anode derived from natural diatomite to realize high performance all-solid-state LMBs.

The natural diatomite is firstly transformed by researchers into hierarchical silicon framework via a magnesiothermic reduction process. Then, the diatomite derived silicon (DF-Si) powder is mixed with molten Li to yield hierarchical lithium silicide-Li hybrid fragments, which could be cold-pressed into a composite anode after the polyethylene oxide based solid polymer electrolyte (PEO-SPE) decoration.

In as-fabricated PEO-SPE coated diatomite derived lithium silicide-Li (PEO-DLSL) composite anode, researchers embeded Li in the hierarchical pores of Li4.4Si framework and PEO coatings, resulting in high electro-active contact area to homogenize the Li+ ion flux and enable the anode integrity. This hybrid anode exhibits stable lithium stripping/plating performance over one thousand hours with average overpotential lower than 100 mV without any short circuit.

Moreover, all-solid-state full cell using this lithium metal composite anode to couple with lithium iron phosphate cathode shows excellent cycling stability (0.04% capacity decay rate for 500 cycles at 0.5 C) and high rate capability (65 mAh g-1at 5 C).

Therefore, the combination of hierarchical Li composite anode and SEs is a promising design to fabricate safe LMBs with high energy/power density.

The present natural diatomite derived hybrid anode will further promote the fabrication of high performance solid state Li batteries from sustainable natural resources. 

 

The natural diatomite derived Li metal composite anode (PEO-DLSL) fabrication process and corresponding Li stripping/plating behavior in comparison to planar Li anode. (Image by YAO Hongbin) 

(Editor: LIU Jia)

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