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A long cycle-life high-voltage spinel lithium-ion battery electrode achieved by site-selective doping.

08:00 EDT 23rd March 2020 | BioPortfolio

Summary of "A long cycle-life high-voltage spinel lithium-ion battery electrode achieved by site-selective doping."

Spinel LiNi0.5Mn1.5O4 (LNMO) is a promising cathode candidate for the next-generation high energy-density lithium-ion batteries (LIBs). Unfortunately, the application of LNMO is hindered by its poor cycle stability. Here, we demonstrate an easily-prepared site-selectively doped LNMO electrode with exceptional durability. In this work, Mg is selectively doped onto both tetrahedral (8a) and octahedral (16c) sites in the Fd-3m structure. This site-selective doping not only suppresses unfavorable two-phase reactions and stabilizes the LNMO structure against structural deformation, but also mitigates the dissolution of Mn during cycling. Mg-doped LNMOs exhibit excellent electrochemical performance, retaining ~86% and ~87% of initial capacity after 1500 cycles at 1 C and 2200 cycles at 10 C, respectively. Such excellent electrochemical performance is also reflected in prototype full-batteries with novel TiNb2O7 counter electrodes. This work pioneers an atomic-doping engineering strategy for electrode materials that could be extended to other energy materials to create high-performance devices.

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This article was published in the following journal.

Name: Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
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