scholarly journals Multiscale factors in designing alkali-ion (Li, Na, and K) transition metal inorganic compounds for next-generation rechargeable batteries

2020 ◽  
Vol 13 (12) ◽  
pp. 4406-4449 ◽  
Author(s):  
Wontae Lee ◽  
Jaeyoung Kim ◽  
Soyeong Yun ◽  
Woosung Choi ◽  
Haegyeom Kim ◽  
...  
Keyword(s):  
Transition Metal ◽  
Cathode Materials ◽  
Inorganic Compounds ◽  
Rechargeable Batteries ◽  
Wide Scope ◽  
Next Generation ◽  
Key Factors ◽  
Factors Influencing ◽  
Alkali Ion

This review provides well-organized and up-to-date information about the key factors influencing the properties and performances of alkali-ion transition metal inorganic cathode materials by encompassing a wide scope from atomic to microscopic levels.

Revealing Practical Specific Capacity and Carbonyl Utilization of Multi-carbonyl Compounds for Organic Cathode Materials

2021 ◽  
Author(s):  
Jun-Lin Shi ◽  
Shi-Qin Xiang ◽  
Dai-Jian Su ◽  
Rongxing He ◽  
Liu-Bin Zhao
Keyword(s):  
Environmental Protection ◽  
Cathode Materials ◽  
Carbonyl Compounds ◽  
Low Cost ◽  
Specific Capacity ◽  
High Capacity ◽  
Rechargeable Batteries ◽  
Next Generation

Organic carbonyl compounds are regarded as promising candidates for next-generation rechargeable batteries in terms of low cost, environmental protection, and high capacity. The carbonyl utilization is a key issue to...

scholarly journals Feeling the strain: enhancing ionic transport in olivine phosphate cathodes for Li- and Na-ion batteries through strain effects

2016 ◽  
Vol 4 (18) ◽  
pp. 6998-7004 ◽  
Author(s):  
Cristina Tealdi ◽  
Jennifer Heath ◽  
M. Saiful Islam
Keyword(s):  
Cathode Materials ◽  
Tensile Strain ◽  
Ionic Transport ◽  
Rechargeable Batteries ◽  
Strain Effects ◽  
Ion Migration ◽  
Olivine Phosphate ◽  
Alkali Ion

Olivine-type phosphates LiFePO4 and NaFePO4 are among the most widely studied cathode materials for rechargeable batteries. Here we show that tensile strain applied perpendicularly to the alkali-ion migration channels will improve their intercalation properties.

scholarly journals Delocalized Metal-Oxygen π-Redox Is the Origin of Anomalous Non-Hysteretic Capacity in Li-Ion and Na-Ion Cathode Materials

2020 ◽  
Author(s):  
Daniil Kitchaev ◽  
Julija Vinckeviciute ◽  
Anton Van der Ven
Keyword(s):  
Transition Metal ◽  
Cathode Materials ◽  
Structural Changes ◽  
Random Phase ◽  
Structural Evolution ◽  
Reversible Capacity ◽  
Rechargeable Batteries ◽  
Excess Capacity ◽  
Rigorous Framework ◽  
Metal Migration

The anomalous capacity of Li-excess cathode materials has ignited a vigorous debate over the nature of the underlying redox mechanism, which promises to substantially increase the energy density of rechargeable batteries. Unfortunately, nearly all materials exhibiting this anomalous capacity suffer from irreversible structural changes and voltage hysteresis. Non-hysteretic excess capacity has been demonstrated in Na<sub>2</sub>Mn<sub>3</sub>O<sub>7</sub> and Li<sub>2</sub>IrO<sub>3</sub>, making these materials key to understanding the electronic, chemical and structural properties that are necessary to achieve reversible excess capacity. Here, we use high-fidelity random-phase-approximation (RPA) electronic structure calculations and group theory to derive the first fully consistent mechanism of non-hysteretic oxidation beyond the transition metal limit, explaining the electrochemical and structural evolution of the Na<sub>2</sub>Mn<sub>3</sub>O<sub>7</sub> and Li<sub>2</sub>IrO<sub>3</sub> model materials. We show that the source of anomalous non-hysteretic capacity is a network of pi-bonded metal-d and O-p orbitals, whose activity is enabled by a unique resistance to transition metal migration. The pi-network forms a collective, delocalized redox center. We show that the voltage, accessible capacity, and structural evolution upon oxidation are collective properties of the pi-network rather than that of any local bonding environment. Our results establish the first rigorous framework linking anomalous capacity to transition metal chemistry and long-range structure, laying the groundwork for engineering materials that exhibit truly reversible capacity exceeding that of transition metal redox.

scholarly journals Perspectives on Li and transition metal fluoride phosphates as cathode materials for a new generation of Li-ion batteries

IUCrJ ◽  
2015 ◽  
Vol 2 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Evgeny V. Antipov ◽  
Nellie R. Khasanova ◽  
Stanislav S. Fedotov
Keyword(s):  
Transition Metal ◽  
Specific Energy ◽  
Cathode Materials ◽  
Mixed Oxides ◽  
Inorganic Compounds ◽  
Metal Fluoride ◽  
Li Ion Batteries ◽  
Practical Applications ◽  
Li Ion ◽  
New Generation

To satisfy the needs of rapidly growing applications, Li-ion batteries require further significant improvements of their key properties: specific energy and power, cyclability, safety and costs. The first generation of cathode materials for Li-ion batteries based on mixed oxides with either spinel or rock-salt derivatives has already been widely commercialized, but the potential to improve the performance of these materials further is almost exhausted. Li and transition metal inorganic compounds containing different polyanions are now considered as the most promising cathode materials for the next generation of Li-ion batteries. Further advances in cathode materials are considered to lie in combining different anions [such as (XO4)n−and F−] in the anion sublattice, which is expected to enhance the specific energy and power of these materials. This review focuses on recent advances related to the new class of cathode materials for Li-ion batteries containing phosphate and fluoride anions. Special attention is given to their crystal structures and the relationships between structure and properties, which are important for their possible practical applications.

scholarly journals Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

2020 ◽  
Vol 10 (43) ◽  
pp. 2001449 ◽  
Author(s):  
Lalit Sharma ◽  
Shashishekar P. Adiga ◽  
Husam N. Alshareef ◽  
Prabeer Barpanda
Keyword(s):  
Cathode Materials ◽  
Rechargeable Batteries ◽  
Next Generation

scholarly journals Delocalized Metal-Oxygen π-Redox Is the Origin of Anomalous Non-Hysteretic Capacity in Li-Ion and Na-Ion Cathode Materials

2020 ◽  
Author(s):  
Daniil Kitchaev ◽  
Julija Vinckeviciute ◽  
Anton Van der Ven
Keyword(s):  
Transition Metal ◽  
Cathode Materials ◽  
Structural Changes ◽  
Random Phase ◽  
Structural Evolution ◽  
Reversible Capacity ◽  
Rechargeable Batteries ◽  
Excess Capacity ◽  
Rigorous Framework ◽  
Metal Migration

The anomalous capacity of Li-excess cathode materials has ignited a vigorous debate over the nature of the underlying redox mechanism, which promises to substantially increase the energy density of rechargeable batteries. Unfortunately, nearly all materials exhibiting this anomalous capacity suffer from irreversible structural changes and voltage hysteresis. Non-hysteretic excess capacity has been demonstrated in Na<sub>2</sub>Mn<sub>3</sub>O<sub>7</sub> and Li<sub>2</sub>IrO<sub>3</sub>, making these materials key to understanding the electronic, chemical and structural properties that are necessary to achieve reversible excess capacity. Here, we use high-fidelity random-phase-approximation (RPA) electronic structure calculations and group theory to derive the first fully consistent mechanism of non-hysteretic oxidation beyond the transition metal limit, explaining the electrochemical and structural evolution of the Na<sub>2</sub>Mn<sub>3</sub>O<sub>7</sub> and Li<sub>2</sub>IrO<sub>3</sub> model materials. We show that the source of anomalous non-hysteretic capacity is a network of pi-bonded metal-d and O-p orbitals, whose activity is enabled by a unique resistance to transition metal migration. The pi-network forms a collective, delocalized redox center. We show that the voltage, accessible capacity, and structural evolution upon oxidation are collective properties of the pi-network rather than that of any local bonding environment. Our results establish the first rigorous framework linking anomalous capacity to transition metal chemistry and long-range structure, laying the groundwork for engineering materials that exhibit truly reversible capacity exceeding that of transition metal redox.

Consumers‟ Acceptance of „Halal‟ Credit Card Services: An Empirical Analysis

2015 ◽  
Vol 3 (1) ◽  
pp. 51 ◽  
Author(s):  
Zaimy Johana Johan ◽  
Lennora Putit
Keyword(s):  
Perceived Control ◽  
Credit Card ◽  
Credit Cards ◽  
Product Knowledge ◽  
Key Factors ◽  
Developing Nation ◽  
Business Transactions ◽  
Factors Influencing ◽  
Financial Credit ◽  
Survey Questionnaires

Many past researches have been carried out in an attempt to continuously understand individuals‟ consumption behaviour. This study was conducted to investigate key factors influencing consumers‟ potential acceptance of halal (or permissible) financial credit card services. Specifically, it anticipated the influence of attitude, social influences and perceived control on consumers‟ behavioural intention to accept such services. In addition, factors such as religiosity and product knowledge were also postulated to affect consumers‟ attitude towards the act of using halal credit cards for any retail or business transactions. Using non-probability sampling approach, a total of 500 survey questionnaires was distributed to targeted respondents in a developing nation but only 220 usable feedbacks were received for subsequent data analysis. Regression results revealed that religiosity and product knowledge significantly influence consumers‟ attitude toward using halal credit card services.  Attitude in turn, subsequently has a significant impact on consumers‟ intention to accept halal financial credit card services. Several theoretical and managerial contributions were observed in this study.   

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