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Cycling stability of doped LiNi0.5Mn1.5O4 spinels LiNi0.5Mn1.5O₄ spinels

Höweling, Andres; Stoll, Andreas; Schmidt, Dirk O.; Geßwein, Holger; Simon, Ulrich; Binder, Joachim R.

The high voltage LiNi0.5Mn1.5O4 spinel suffers from severe capacity fade when cycled against a graphitic anode as well as a relatively low theoretical capacity. Using metallic lithium as counter electrode, the stability is improved and the ability of the spinel structure to host 2 Li eq. can be used to improve the capacity. This leads to a theoretical specific energy of ∼1000 Wh kg−1. Unfortunately, the cycling of 2 Li eq. involves a phase transition from cubic to tetragonal associated with material degradation. In this work doping is used to improve capacity retention when cycling between 2.0 and 5.0 V. Initial capacities and stabilities are directly dependent on synthesis conditions and doping elements. Therefore, Fe- and Ti-doped spinels are compared with Ru- and Ti-doped spinels and tested at different cycling conditions. The cycling stability can be improved significantly by using reannealed material and by changing the discharge cutoff criteria. Thus a capacity of 190 mAh g−1 is achieved at a rate of C/2 with a capacity retention of ∼92% after 100 cycles. Furthermore, differences in the discharge behavior between the different ... mehr

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1149/2.0521701jes
ISSN: 0013-4651, 0096-4743, 0096-4786, 1945-7111
KITopen ID: 1000067329
HGF-Programm 37.01.01; LK 01
Erschienen in Journal of the Electrochemical Society
Band 164
Heft 1
Seiten A6349-A6358
Schlagworte cycling between 2.0 and 5.0V, doping, high voltage spinel, in situ XRD, lithium ion batteries
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