Potassium Ordering and Structural Phase Stability in Layered KxCoO2

Toriyama, Michael Y.; Kaufman, Jonas L.; Ven, Anton Van der

doi:10.1021/acsaem.8b02238

Cited by 33 publications

(39 citation statements)

References 61 publications

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“…More details about the precise orderings are reported in [61]. The same intercalant ordering preferences have been predicted for K y CoO 2 in the P3 structure [69]. In both Na y TiS 2 and Na y CoO 2 , stable ordered superstructures are predicted at nearly arbitrary composition (within some range) and formed by incorporating a certain density of APBs.…”

Section: Intercalant Orderingssupporting

confidence: 60%

“…The ordering that produces this step will be discussed in the next section. A significant step near y = 1/2 has also been observed in some K intercalation compounds [67,68], which likely corresponds to a similar ordering [69]. P3 is stable up to y = 2/3 in Na y CoO 2 versus y ≈ 0.72 in Na y TiS 2 , indicating that the face-sharing penalty begins to destabilize P3 sooner in the more ionic Na y CoO 2 .…”

Section: Trends In Phase Stabilitysupporting

confidence: 55%

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Understanding intercalation compounds for sodium-ion batteries and beyond

Kaufman

Vinckevičiūtė

Kolli

et al. 2019

Phil. Trans. R. Soc. A.

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Intercalation compounds are popular candidate electrode materials for sodium-ion batteries and other ‘beyond lithium-ion’ technologies including potassium- and magnesium-ion batteries. We summarize first-principles efforts to elucidate the behaviour of such compounds in the layered and spinel structures. Trends based on the size and valence of the intercalant and the ionicity of the host are sufficient to explain phase stability and ordering phenomena, which in turn determine the equilibrium voltage profile. For the layered structures, we provide an overarching view of intercalant orderings in prismatic coordination based on antiphase boundaries, which has important consequences for diffusion. We examine details of stacking sequence transitions between different layered structures by calculating stacking fault energies and discussing the nature of dislocations. A better understanding of these transitions will likely aid the development of batteries with improved cyclability. This article is part of a discussion meeting issue ‘Energy materials for a low carbon future’.

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Section: Intercalant Orderingssupporting

confidence: 60%

Section: Trends In Phase Stabilitysupporting

confidence: 55%

Understanding intercalation compounds for sodium-ion batteries and beyond

Kaufman

Vinckevičiūtė

Kolli

et al. 2019

Phil. Trans. R. Soc. A.

Self Cite

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“…A typical example is K x CoO 2 with manifested three different K + /vacancy ordering patterns depending on x ranging from 1/2, 4/7 to 2/3. [ 95 ] Thus, the electrochemical procedure of K + insertion is accompanied by the first‐order transition at particular K contents, which is also observed in other layered oxides such as K x MnO 2 [ 39 ] and K x CrO 2 . [ 31 ] The presence of ordered intermediate phases caused by K + /vacancy ordering rearrangement naturally induces additional activation energy barrier for K + mobility and reduces the dimensionality of ionic transport as well as capacity stability during cycling.…”

Section: Challenges and Perspectivesmentioning

confidence: 79%

Layered Oxide Cathode for Potassium‐Ion Battery: Recent Progress and Prospective

Zhang

Wei

Dinh

et al. 2020

Small

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Rechargeable potassium‐ion batteries (KIBs) have demonstrated great potential as alternative technologies to the currently used lithium‐ion batteries on account of the competitive price and low redox potential of potassium which is advantageous to applications in the smart grid. As the critical component determining the energy density, appropriate cathode materials are of vital need for the realization of KIBs. Layered oxide cathodes are promising candidates for KIBs due to high reversible capacity, appropriate operating potential, and most importantly, facile and easily scalable synthesis. In light of this trend, the recent advancements and progress in layered oxides research for KIBs cathodes, covering material design, structural evolution, and electrochemical performance are comprehensively reviewed. The structure–performance correlation and some effective optimization strategies are also discussed. Furthermore, challenges and prospects of these layered cathodes are included, with the purpose of providing fresh impetus for future development of these materials for advanced energy storage systems.

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“…[ 21,22 ] Conversely, organic cathodes have relatively high capacities of approximately 200 mA h g −1 , but redox potentials are approximately 2.5 V. [ 23,24 ] The capacities and voltages of PB and PBAs, along with the layered metal oxides are between the values of polyanion and organic compounds. [ 25–28 ] Currently, energy density based on the potassium cathode part is still less than 500 Wh K g −1 . [ 5 ] For the K‐ion full cell, the energy densities of PIBs are less than 400 Wh kg −1 (based on the total weight of cathode and anode materials).…”

Section: Introductionmentioning

confidence: 99%

Advanced Post‐Potassium‐Ion Batteries as Emerging Potassium‐Based Alternatives for Energy Storage

Yao

Zhu

2020

Adv Funct Materials

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Potassium-based batteries are considered attractive alternatives for lithium ion batteries, particularly for large-scale energy storage, owing to their economic value and abundance. There have been significant achievements in the extensive investigations of potassium-ion batteries (PIBs). However, post-potassium-ion batteries (post-PIBs), including potassium-sulfur (K-S), potassium-selenium (K-Se), all-solid-state potassium-ion batteries (ASSPIBs), and aqueous potassium-ion batteries (APIBs) along with their respective advantages such as higher energy density, better safety, lower costs, and higher power density, are still in the initial stages of research and require further attention. Therefore, this review summarizes the recent progress, current challenges, and advancements in post-PIBs such as K-S/ Se batteries and ASSPIBs. Additionally, the challenges and solutions of using K metal in such systems are discussed. Thereafter, smart designs for electrodes and electrolytes, along with rational constructions for obtaining desirable APIBs are evaluated. Finally, the development trends, challenges, and prospects are estimated for advanced post-PIBs. This review provides instructive guidelines for research and development of promising potassiumbased systems, in particular, further application of post-PIBs.

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Potassium Ordering and Structural Phase Stability in Layered K_xCoO₂

Cited by 33 publications

References 61 publications

Understanding intercalation compounds for sodium-ion batteries and beyond

Understanding intercalation compounds for sodium-ion batteries and beyond

Layered Oxide Cathode for Potassium‐Ion Battery: Recent Progress and Prospective

Advanced Post‐Potassium‐Ion Batteries as Emerging Potassium‐Based Alternatives for Energy Storage

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