Mechanochemically tuned structural annealing: A new pathway to enhancing Li-ion intercalation activity in nanosized β LiFeSiO
Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 7, Issue: 22, Page: 13705-13713
2019
- 6Citations
- 13Captures
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Article Description
In this work, a relatively inactive cathode material, β orthorhombic LiFeSiO with the Pmn2 space group, is shown to undergo crystal structural changes when subjected to nanosizing by high-energy milling that have a pronounced activation impact on Li-ion intercalation electrochemistry. In particular, we present evidence of mechanically induced structural annealing including lattice expansion, reduction of anti-site defects and preferred crystal orientation, opposite of what expected typically from nanosizing. As a result of this type of unreported structural activation for orthosilicates, a threefold increase of the accessible discharge (=intercalation) capacity of the high-energy milled Pmn2 material is attained, much higher than what would be expected solely from surface area increase due to nanosizing and surface area increase. Such mechanochemically induced structural annealing activates Li-ion diffusion (one order of magnitude enhancement in D) into less accessible sites via the combined effects of anti-site defect removal and modulation of the Fe-O coordination adjustment. Structural activation of intercalation materials via controlled mechanochemistry opens new possibilities in nanoengineering high energy density Li-ion storage electrodes.
Bibliographic Details
Royal Society of Chemistry (RSC)
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