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| 001 | 841812 | ||
| 005 | 20240709081851.0 | ||
| 024 | 7 | _ | |a 10.1063/1.5008251 |2 doi |
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| 100 | 1 | _ | |a Niemöller, Arvid |0 P:(DE-Juel1)166446 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Monitoring local redox processes in LiNi 0.5 Mn 1.5 O 4 battery cathode material by in operando EPR spectroscopy |
| 260 | _ | _ | |a Melville, NY |c 2018 |b American Institute of Physics |
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| 520 | _ | _ | |a Despite the multitude of analytical methods available to characterize battery cathode materials, identifying the factors responsible for material aging is still challenging. We present the first investigation of transient redox processes in a spinel cathode during electrochemical cycling of a lithium ion battery by in operando electron paramagnetic resonance (EPR). The battery contains a LiNi0.5Mn1.5O4 (LNMO) spinel cathode, which is a material whose magnetic interactions are well understood. The evolution of the EPR signal in combination with electrochemical measurements shows the impact of Mn3+ on the Li+ motion inside the spinel. Moreover, state of charge dependent linewidth variations confirm the formation of a solid solution for slow cycling, which is taken over by mixed models of solid solution and two-phase formation for fast cycling due to kinetic restrictions and overpotentials. Long-term measurements for 480 h showed the stability of the investigated LNMO, but also small amounts of cathode degradation products became visible. The results point out how local, exchange mediated magnetic interactions in cathode materials are linked with battery performance and can be used for material characterization |
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| 773 | _ | _ | |a 10.1063/1.5008251 |g Vol. 148, no. 1, p. 014705 - |0 PERI:(DE-600)1473050-9 |n 1 |p 014705 - |t The journal of chemical physics |v 148 |y 2018 |x 1089-7690 |
| 856 | 4 | _ | |y Published on 2018-01-04. Available in OpenAccess from 2019-01-04. |u https://juser.fz-juelich.de/record/841812/files/1.5008251.pdf |
| 856 | 4 | _ | |y Published on 2018-01-04. Available in OpenAccess from 2019-01-04. |x icon |u https://juser.fz-juelich.de/record/841812/files/1.5008251.gif?subformat=icon |
| 856 | 4 | _ | |y Published on 2018-01-04. Available in OpenAccess from 2019-01-04. |x icon-180 |u https://juser.fz-juelich.de/record/841812/files/1.5008251.jpg?subformat=icon-180 |
| 856 | 4 | _ | |y Published on 2018-01-04. Available in OpenAccess from 2019-01-04. |x icon-700 |u https://juser.fz-juelich.de/record/841812/files/1.5008251.jpg?subformat=icon-700 |
| 856 | 4 | _ | |y Published on 2018-01-04. Available in OpenAccess from 2019-01-04. |x pdfa |u https://juser.fz-juelich.de/record/841812/files/1.5008251.pdf?subformat=pdfa |
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