Zur Kenntnis des α‐LiFeO<sub>2</sub>‐Typs

Hoffmann, Leena Koni; Hoppe, R.

doi:10.1002/zaac.19774300111

Cited by 15 publications

(2 citation statements)

References 11 publications

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“…Ionic radius of Li + is in octahedral coordination 0.76 Å similar to those of transition‐metal ions . Lithium ion is often mixed with transition metal ions, resulting in formation of a cation‐ordered rack‐salt type (γ‐LiFeO 2 type) or a cation‐disordered rock‐salt type (NaCl type) phase as seen in Figure . While, ionic radius of Na + (1.02 Å) is larger than those of Li + and transition‐metal ions, leading to obvious separation of Na + layer and transition‐metal one along 〈111〉 direction in a NaCl type structure, and a variety of transition metals can be accommodated in α‐NaFeO 2 type NaMeO 2 .…”

Section: Crystal Structures Of Layered Materialsmentioning

confidence: 98%

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Kubota

Kumakura

Yoda

et al. 2018

Advanced Energy Materials

307

246

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electrode in Na-ion batteries is also advantageous to the cost reduction, while copper foil is necessary in Li-ion batteries. [30,31] Studies on room-temperature Na-ion batteries have started since 1970s and electrochemical properties of Na//Na x CoO 2 and Na//TiS 2 cells were reported in 1980 [32,33] when that of Li//LiCoO 2 was also first reported. [34] Then, Li-ion batteries was commercialized in 1991. In principle, Li-ion batteries consist of a Li-containing material such as LiCoO 2 as a positive electrode material and a Li-insertion material such as carbon as a negative one. On charge process, Li + ions move from the posi tive to negative electrode through electrolyte solution with simultaneous movement of electrons through an external circuit. A discharge process proceeds in the opposite direction. Li + ions and electrons come back to the positive electrode on the discharge. For ease in handling, Licontaining materials are utilized for the positive and non-Li ones for the negative electrode. Li-ion batteries have attracted much attention as high-voltage rechargeable batteries. On the other hand, Na-ion batteries essentially consist of the same technology with Li-ion batteries, except charge carriers. Na-containing materials are used for the positive and non-Na ones for the negative electrode. Na//Na x CoO 2 , however, shows working voltage ≈1 V lower than Li//LiCoO 2 , resulting in lower energy density. [35] As a result, Na-ion batteries have never been commercialized so far. [18] Indeed, Allied Corp. in USA, Showa Denko K. K., and Hitachi, Ltd. in Japan had collaborative work on Na-ion batteries and filed patents of Na-Pb alloy//γ-Na x CoO 2 cells [36][37][38][39] exhibiting good cycle stability but they had never commercialized the Na-ion batteries. The Na-Pb alloy//γ-Na x CoO 2 cells needed presodiation process for the Pb negative electrode. Therefore, primary drawback of Na-ion batteries was no candidates as practical negative electrode materials without Na predoping. Now, nongraphitizable carbon, so called hard carbon, is known to deliver large reversible capacity with good capacity retention. [40,41] Thus, secondary issue is low working potential of positive electrode materials. Open circuit potential of αand γ-Na x CoO 2 in Na cells is lower than that of α-NaFeO 2 type LiCoO 2 in the Li cell at the end of discharge. Indeed, standard redox potential of Na metal is lower than that of Li metal by ≈0.3 V. [42,43] The difference is, however, much smaller than that between Na x CoO 2 and LiCoO 2 at the end of discharge (ΔV ≈ 1.5 V), [14] which is probably due to larger ionic size and lower Lewis acidity of Na + in comparison to Li + as already discussed by Goodenough and Mizushima et al. in 1980. [35] Since our group demonstrated hard carbon//NaNi 1/2 Mn 1/2 O 2 full cells exhibiting acceptable cycle stability in 2009 [44] and Sodium 3d transition metal oxides for Na-ion batteries have attracted attention of battery researchers because of their new chemistries and abundant material resources in the eart...

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Section: Crystal Structures Of Layered Materialsmentioning

confidence: 98%

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Kubota

Kumakura

Yoda

et al. 2018

Advanced Energy Materials

307

246

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“…It is worth noting that there are other structure types such as g-LiFeO 2 type, in which Li + and transition metal cations are ordered, and b-NaMnO 2 type known as a corrugated (zig-zag) layer type. [32][33][34] In the O3 type Li x MO 2 , cationic mixing is oen observed due to the similar radius size between Li + and transition metal ion(s). In contrast, larger A + such as Na + and K + show a large variety of transition metals adopting the O3 type structure without cation mixing.…”

Section: Polymorphs Of Layered Oxidesmentioning

confidence: 99%

Active material and interphase structures governing performance in sodium and potassium ion batteries

et al. 2022

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Layered NaMO₂for the Positive Electrode

Komaba

Kubota

2021

Na‐ion Batteries

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Zur Kenntnis des α‐LiFeO₂‐Typs

Abstract: Der Madelunganteil der Gitterenergie, MAPLE, wird für LiFeO2 als Funktion von c/a und z0 bei konstantem Molvolumen berechnet. Die beobachteten Werte von c/a und z0 hängen zusammen und können erklärt werden.

Cited by 15 publications

References 11 publications

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Active material and interphase structures governing performance in sodium and potassium ion batteries

Layered NaMO₂for the Positive Electrode

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Zur Kenntnis des α‐LiFeO2‐Typs

Abstract: Der Madelunganteil der Gitterenergie, MAPLE, wird für LiFeO2 als Funktion von c/a und z0 bei konstantem Molvolumen berechnet. Die beobachteten Werte von c/a und z0 hängen zusammen und können erklärt werden.

Cited by 15 publications

References 11 publications

Electrochemistry and Solid‐State Chemistry of NaMeO2 (Me = 3d Transition Metals)

Electrochemistry and Solid‐State Chemistry of NaMeO2 (Me = 3d Transition Metals)

Active material and interphase structures governing performance in sodium and potassium ion batteries

Layered NaMO2for the Positive Electrode

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Zur Kenntnis des α‐LiFeO₂‐Typs

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Electrochemistry and Solid‐State Chemistry of NaMeO₂ (Me = 3d Transition Metals)

Layered NaMO₂for the Positive Electrode