Maximizing the electrical energy stored in, and drawing high power from Li-ion batteries requires preparative methods that generate high purity nanomaterials. Although low temperature synthesis methods known to generate nanoscale materials have been adapted for promising candidates for Li-ion battery technology, their electrochemical performance is often plagued by point defects, particle aggregation, and impurity phases�all of which can be minimized if one has a thorough understanding of and appreciation for inorganic reaction chemistry. The high-voltage material Li1+xNi0.5Mn1.5O4�d (x = 0.02, d = 0.12), can be synthesized in two hydrothermal steps to give submicron nanocrystals that show a reversible gravimetric capacity of 120 mAh/g with ~17% capacity fade in the first 100 cycles at 1 C current when cycled between 3.4 and 5.0 V vs. Li+/0. When the voltage limits are modified to 3.4 � 4.4 V or 4.4 � 5.0 V, the capacity retention is nearly quantitative over hundreds of cycles.

Low temperature synthesis of the high-voltage spinel Li1+xNi0.5Mn1.5O4–δ (x = 0.02, δ = 0.12) and their potential as Li-ion battery cathodes

245th National Meeting (2013)

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