Materials Science

A solid approach to improving batteries

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Science  06 Jan 2017:
Vol. 355, Issue 6320, pp. 36
DOI: 10.1126/science.355.6320.36-g

Many of the limitations of lithium ion batteries arise from the liquid electrolytes because they limit the operating voltage; they are often flammable and can contribute to the decreased capacity of a cell. Solid-state electrolytes could solve these problems, but there have been challenges at the interfaces to reduce the impedance, and when lithium is used as the anode, it can react with most solid-state electrolyte materials. Han et al. show they can solve the interfacial stability and wetting problems between lithium and the garnet-like electrolyte Li7La2.75Ca0.25Zr1.75Nb0.25O12 by depositing a thin layer of aluminum oxide by means of atomic layer deposition. A full cell using a high-voltage Li2FeMn3O8 cathode robustly cycled at voltages above 4 V.

Nat. Mater. 10.1038/NMAT4821(2016).

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