scholarly journals Fe–Si networks and charge/discharge-induced phase transitions in Li2FeSiO4 cathode materials

2018 ◽  
Vol 20 (21) ◽  
pp. 14557-14563 ◽  
Author(s):  
Xiaobao Lv ◽  
Xin Zhao ◽  
Shunqing Wu ◽  
Manh Cuong Nguyen ◽  
Zizhong Zhu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Structural Phase ◽  
Li Ion Batteries ◽  
Structural Phase Transitions ◽  
Li Ion ◽  
Charge Discharge

Structural phase transitions of electrode materials are responsible for poor reversibility during charge/discharge cycling in Li-ion batteries.

scholarly journals Study on the structural phase transitions in NaSICON-type compounds using Ag3Sc2(PO4)3 as a model system

2020 ◽  
Vol 77 (1) ◽  
Author(s):  
Günther J. Redhammer ◽  
Gerold Tippelt ◽  
Quirin Stahl ◽  
Artur Benisek ◽  
Daniel Rettenwander
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Ionic Conductivities ◽  
Phase Behaviour ◽  
Li Ion Batteries ◽  
Two Phase ◽  
Structured Materials ◽  
Β Phase ◽  
Nasicon Type ◽  
Li Ion

NaSICON (Na Super-Ionic CONducting) structured materials are among the most promising solid electrolytes for Li-ion batteries and `beyond Li-ion' batteries (e.g. Na and K) due to their superior ionic conductivities. Although this material has been well known for decades, its exact phase behaviour is still poorly understood. Herein, a starting material of Na3Sc2(PO4)3 single crystals is used, grown by flux methodology, where Na is subsequently chemically replaced by Ag, in order to take advantage of the higher scattering contrast of Ag. It is found that the NaSICON-type compound shows two phase transitions from a low-temperature monoclinic α-phase to a monoclinic β-phase at about 180 K and to a rhombohedral γ-phase at about 290 K. The framework of [Sc2(PO4)3]3− is rigid and does not change significantly with temperature and change of symmetry. The main driving force for the phase transitions is related to order–disorder phenomena of the conducting cations. The sensitivity of the phase behaviour on the ordering of these ions suggests that small compositional changes can have a great impact on the phase behaviour and, hence, on the ionic conductivity of NaSICON-structured materials.

Effects of Li-doped NiO on the charge–discharge properties of LiF–NiO composites used as cathode materials for Li-ion batteries

2017 ◽  
Vol 47 (9) ◽  
pp. 1057-1063 ◽  
Author(s):  
Yasumasa Tomita ◽  
Noritaka Kimura ◽  
Hiromasa Nasu ◽  
Yusuke Izumi ◽  
Juichi Arai ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Charge Discharge

Li-rich layer-structured cathode materials for high energy Li-ion batteries

2014 ◽  
Vol 07 (04) ◽  
pp. 1430002 ◽  
Author(s):  
Liu Li ◽  
Kim Seng Lee ◽  
Li Lu
Keyword(s):  
Cathode Materials ◽  
High Capacity ◽  
Rate Capability ◽  
Reversible Capacity ◽  
High Energy ◽  
Li Ion Batteries ◽  
Practical Applications ◽  
Depth Study ◽  
Li Ion ◽  
Charge Discharge

Li -rich layer-structured x Li 2 MnO 3 ⋅ (1 - x) LiMO 2 ( M = Mn , Ni , Co , etc.) materials have attracted much attention due to their extraordinarily high reversible capacity as the cathode material in Li -ion batteries. To better understand the nature of this type of materials, this paper reviews history of development of the Li -rich cathode materials, and provides in-depth study on complicated crystal structures and reaction mechanisms during electrochemical charge/discharge cycling. Despite the fabulous capability at low rate, several drawbacks still gap this type of high-capacity cathode materials from practical applications, for instance the large irreversible capacity loss at first cycle, poor rate capability, severe voltage decay and capacity fade during electrochemical charge/discharge cycling. This review will also address mechanisms for these inferior properties and propose various possible solutions to solve above issues for future utilization of these cathode materials in commercial Li -ion batteries.

scholarly journals An overview of bio-interface electrolyte and Li2FePO4F as cathode in Li-ion batteries

2019 ◽  
Vol 9 (2) ◽  
pp. 3866-3873
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
View Point ◽  
Iron Nickel ◽  
Li Ion ◽  
Charge Discharge

Composites of {[(1-x-y) LiFe0.333Ni0.333 Co0.333] PO4}, xLi2FePO4F and yLiCoPO4system were synthesized using the sol-gel method. Stoichiometric weights of the mole-fraction of LiOH, FeCl2·4H2O and H3PO4, LiCl, Ni(NO3)2⋅6H2O, Co(Ac)2⋅4H2O, as starting materials of lithium, Iron, Nickel , and Cobalt, in 7 samples of the system, respectively. We exhibited Li1.167 Ni0.222 Co0.389 Fe0.388 PO4 is the best composition for cathode material in this study. Obviously, the used weight of cobalt in these samples is lower compared with LiCoO2 that is an advantage in view point of cost in this study. Charge-discharge haracteristics of the mentioned cathode materials were investigated by performing cycle tests in the range of 2.4–3.8 V (versus Li/Li+). Our results confirmed, although these kind systems can help for removing the disadvantage of cobalt which mainly is its cost and toxic, the performance of these kind systems are similar to the commercial cathode materials in Lithium Ion batteries (LIBs).

scholarly journals The elusive magnetic ground state of sodium superoxide (NaO2)

2021 ◽  
Author(s):  
Sarajit Biswas ◽  
Molly De Raychaudhury
Keyword(s):  
Ground State ◽  
First Principles ◽  
Alternative Energy ◽  
Density Functional ◽  
Structural Phase ◽  
Li Ion Batteries ◽  
Structural Phase Transitions ◽  
Magnetic Ground State ◽  
Functional Theory ◽  
Li Ion

Abstract An alternative energy storage solution to Li-ion batteries is a higher alkali metal superoxide, namely NaO2. It is well-known that the transport properties of this alkali superoxide are governed by the transfer of charge between O2 dimers. Although it goes through a plethora of structural phase transitions, its electronic and magnetic ground state remains shrouded. In this work, we perform first-principles density functional theory (DFT) calculations in order to understand the electronic structure, the source of the ‘unconventional’ magnetic properties and its effect on conductivity in Na superoxide. Finally, we explore the connection between magnetogyration and the magnetic ground state of NaO2 remaining undetected till date.

scholarly journals A Comprehensive Review of Li-Ion Battery Materials and Their Recycling Techniques

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1161 ◽  
Author(s):  
Hee-Je Kim ◽  
TNV Krishna ◽  
Kamran Zeb ◽  
Vinodh Rajangam ◽  
Chandu V. V. Muralee Gopi ◽  
...  
Keyword(s):  
Energy Storage ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Li Ion Batteries ◽  
Next Generation ◽  
Recent Advances ◽  
Metal Metal ◽  
Li Ion ◽  
Energy Storage Applications ◽  
Recycling Techniques

In the context of constant growth in the utilization of the Li-ion batteries, there was a great surge in the quest for electrode materials and predominant usage that lead to the retiring of Li-ion batteries. This review focuses on the recent advances in the anode and cathode materials for the next-generation Li-ion batteries. To achieve higher power and energy demands of Li-ion batteries in future energy storage applications, the selection of the electrode materials plays a crucial role. The electrode materials, such as carbon-based, semiconductor/metal, metal oxides/nitrides/phosphides/sulfides, determine appreciable properties of Li-ion batteries such as greater specific surface area, a minimal distance of diffusion, and higher conductivity. Various classifications of the anode materials such as the intercalation/de- intercalation, alloy/de-alloy, and various conversion materials are illustrated lucidly. Further, the cathode materials, such as nickel-rich LiNixCoyMnzO2 (NCM), were discussed. NCM members such as NCM 333, NCM 523 that enabled to advance for NCM622 and NCM81are reported. The nanostructured materials bridged the gap in the realization of next-generation Li-ion batteries. Li-ion batteries’ electrode nanostructure synthesis, performance, and reaction mechanisms were considered with great concern. The serious effects of Li-ion batteries disposal need to be cut significantly to reduce the detrimental effect on the environment. Hence, the recycling of spent Li-ion batteries has gained much attention in recent years. Various recycling techniques and their effect on the electroactive materials are illustrated. The key areas covered in this review are anode and cathode materials and recent advances along with their recycling techniques. In light of crucial points covered in this review, it constitutes a suitable reference for engineers, researchers, and designers in energy storage applications.

Layered tetragonal zinc chalcogenides for energy-related applications: from photocatalysts for water splitting to cathode materials for Li-ion batteries

Nanoscale ◽  
2017 ◽  
Vol 9 (44) ◽  
pp. 17303-17311 ◽  
Author(s):  
Jia Zhou ◽  
Houlong L. Zhuang ◽  
H. Wang
Keyword(s):  
Water Splitting ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Layered Structures ◽  
Li Ion Batteries ◽  
Strong Adsorption ◽  
Li Ion

The t-ZnX layered structures are promising electrode materials for LIBs exhibiting a strong adsorption of lithium without reducing lithium mobility.

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