Shranjeno v:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Recurso digital |
| Jezik: | angleščina |
| Izdano: |
Zenodo
2023
|
| Teme: | |
| Online dostop: | https://doi.org/10.1002/aenm.202203889 |
| Oznake: |
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Kazalo:
- <p>Despite significant potential as energy storage materials for electric vehicles due to their combination of high energy density per unit cost and reduced environmental and ethical concerns, Co-free lithium ion batteries based on layered Mn oxides presently lack the longevity and stability of their Co-containing counterparts. Here, a reduction in this performance gap is demonstrated via chemical doping, with Li<sub>1.1</sub>Ni<sub>0.35</sub>Mn<sub>0.54</sub>Al<sub>0.01</sub>O<sub>2</sub> achieving an initial discharge capacity of 159 mAhg<sup>−1</sup> at C/3 rate and a corresponding capacity retention of 94.3% after 150 cycles. The nanoscale origins of this improvement are subsequently explored through a combination of advanced diffraction, spectroscopy, and electron microscopy techniques, finding that optimized doping profiles lead to an improved structural and chemical compatibility between the two constituent sub-phases that characterize the layered Mn oxide system, resulting in the formation of unobstructed lithium ion pathways between them. A structural stabilization effect of the host compound is also directly observed near the surface using aberration corrected scanning transmission electron microscopy and integrated differential phase contrast imaging.</p>