2019
DOI: 10.1016/j.jallcom.2018.08.243
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Controllable formation of lithium carbonate surface phase during synthesis of nickel-rich LiNi0.9Mn0.1O2 in air and its protection role in electrochemical reaction

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Cited by 25 publications
(19 citation statements)
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“…The most widely known Co‐free cathode, Li[Ni 0.5 Mn 0.5 ]O 2 , has attracted significant interest; however, its relatively low capacity renders the cathode unsuitable for applications requiring high‐energy‐density . To increase the discharge capacity, Li[Ni 0.6 Mn 0.4 ]O 2 , Li[Ni 0.7 Mn 0.3 ]O 2 , Li[Ni 0.8 Mn 0.2 ]O 2 , and Li[Ni 0.9 Mn 0.1 ]O 2 cathodes have been proposed, but their inferior cycling stability make their practical utilization questionable . In this study, we systematically investigate the characteristics of a Co‐free Ni‐rich Li[Ni x Mn 1‐ x ]O 2 cathode by gradually removing Co from Li[Ni 0.9 Co 0.1 ]O 2 .…”
Section: Introductionmentioning
confidence: 99%
“…The most widely known Co‐free cathode, Li[Ni 0.5 Mn 0.5 ]O 2 , has attracted significant interest; however, its relatively low capacity renders the cathode unsuitable for applications requiring high‐energy‐density . To increase the discharge capacity, Li[Ni 0.6 Mn 0.4 ]O 2 , Li[Ni 0.7 Mn 0.3 ]O 2 , Li[Ni 0.8 Mn 0.2 ]O 2 , and Li[Ni 0.9 Mn 0.1 ]O 2 cathodes have been proposed, but their inferior cycling stability make their practical utilization questionable . In this study, we systematically investigate the characteristics of a Co‐free Ni‐rich Li[Ni x Mn 1‐ x ]O 2 cathode by gradually removing Co from Li[Ni 0.9 Co 0.1 ]O 2 .…”
Section: Introductionmentioning
confidence: 99%
“…However, the better coating effect of thicker Li 2 CO 3 layers results in the better cycling stability at lower rates while the poorer conduction of thicker Li 2 CO 3 layers leads to the poorer cycling performance at higher rates. Therefore, For A‐LNMO more Li 2 CO 3 results in the poorer rate capability and cycling stability at a high rate of 5 C due to its poor conductivity, and the better cycling stability at a low rate of 1 C as a consequence of its coating effect . The poor conductivity of A‐LNMO (Figure g) with more Li 2 CO 3 surface phase renders the H2/H3 phase transition to take place at higher charge potential for the initial cycle and then lower charge potential for the following cycles, as shown in Figure a, which is actually equivalent to the suppression of the H2/H3 transition .…”
Section: Resultsmentioning
confidence: 98%
“…A‐LNMO and O‐LNMO at 1 C for 100 cycles exhibit the capacity retentions of 57.0% and 47.6%, respectively, whereas their retentions at 5 C for 100 cycles are 38.0% and 3.7%, respectively. Interestingly, A‐LNMO has a better cycling stability at 1 C but a worse stability at 5 C compared with O‐LNMO . Therefore, O‐LNMO shows a better rate capability, and a much better (worse) cycling performance at high (low) rates.…”
Section: Resultsmentioning
confidence: 99%
“…synthesized LiNi 0.9 Mn 0.1 O 2 and LiNi 0.95 Co 0.025 Mn 0.025 O 2 materials with nickel content more than 90%, and achieved a very considerable initial discharge specific capacity. [ 28‐29 ] However, the high nickel content will give rise to the generation of surface residual lithium compounds (RLCs) and the side effects of these impurities, including low first efficiency and weak storage property and the like, cannot be ignored. [ 30‐33 ] Cho et al .…”
Section: Introductionmentioning
confidence: 99%
“…As a result, it is of considerable significance to remove the RLCs on the surface of the cathode active particles and inhibit their further formation in the following storage and transportation process. On account of the instability of nickel in Ni‐rich cathode materials, [ 29,37‐38 ] the lattice lithium ions quickly accumulate on the surface of the cathode materials. The contact between active lithium ions and the trace amount of CO 2 and H 2 O in the air would form undesired RLCs.…”
Section: Introductionmentioning
confidence: 99%