Abstract
Alkali metal pyrophosphate, A2MP2O7 (A = Li, Na, M = Fe Mn, Co), have been recently reported as novel polyanionic cathode materials for rechargeable alkali-ion batteries with competent electrochemical properties with high rate durability. A closer look revealed they offer the highest operating voltage by M3+/M2+ redox couple among ever reported related compounds. Of particular interest is its much safer nature than olivine LiFePO4 currently recognized as the only practical option providing definitely safe large-scale lithium-ion battery. Scientific origins of these promising features will be unveiled in this article.
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