Fusing semiconductor and nonmetal into a high conductive wide-range solid solution alloy for Li-ion batteries

Li-rich layered cathodes based on Li2MnO3 have exhibited extraordinary promise to satisfy the rapidly increasing demand for high-energy density Li-ion batteries.

Download Full-text

Construction of conductive Ni-Co-molybdate solid-solution nanoparticles encapsulated in carbon nanofibers towards Li-ion batteries as high-rate anodes

Electrochimica Acta ◽

10.1016/j.electacta.2021.139564 ◽

2021 ◽

pp. 139564

Author(s):

Dienguila Kionga Denis ◽

Guangyuan Wang ◽

Linrui Hou ◽

Guozhu Chen ◽

Changzhou Yuan

Keyword(s):

Solid Solution ◽

Carbon Nanofibers ◽

High Rate ◽

Li Ion Batteries ◽

Li Ion

Download Full-text

Synthesis and Electrochemical Performance of Graphene Wrapped SnxTi1−xO2Nanoparticles as an Anode Material for Li-Ion Batteries

Journal of Nanomaterials ◽

10.1155/2015/965061 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Xing Xin ◽

Xufeng Zhou ◽

Tao Shen ◽

Zhaoping Liu

Keyword(s):

Solid Solution ◽

Electrochemical Performance ◽

Anode Material ◽

Solution Method ◽

Substitutional Solid Solution ◽

Li Ion Batteries ◽

Li Ion ◽

The Stability ◽

Ti Content ◽

Aqueous Solution Method

Ever-growing development of Li-ion battery has urged the exploitation of new materials as electrodes. Here,SnxTi1-xO2solid-solution nanomaterials were prepared by aqueous solution method. The morphology, structures, and electrochemical performance ofSnxTi1-xO2nanoparticles were systematically investigated. The results indicate that Ti atom can replace the Sn atom to enter the lattice of SnO2to form substitutional solid-solution compounds. The capacity of the solid solution decreases while the stability is improved with the increasing of the Ti content. Solid solution withxof 0.7 exhibits the optimal electrochemical performance. The Sn0.7Ti0.3O2was further modified by highly conductive graphene to enhance its relatively low electrical conductivity. The Sn0.7Ti0.3O2/graphene composite exhibits much improved rate performance, indicating that theSnxTi1-xO2solid solution can be used as a potential anode material for Li-ion batteries.

Download Full-text

Operando Monitoring the Insulator-Metal Transition of LiCoO2

10.26434/chemrxiv.14113109.v1 ◽

2021 ◽

Author(s):

Eibar Flores ◽

Nataliia Mozhzhukhina ◽

Ulrich Aschauer ◽

Erik Berg

Keyword(s):

Phase Transition ◽

Solid Solution ◽

Raman Spectroscopy ◽

Dft Calculations ◽

Active Material ◽

Rate Capability ◽

Li Ion Batteries ◽

Two Phase ◽

Insulator Metal Transition ◽

Li Ion

LiCoO2 (LCO) is one of the most-widely used cathode active materials for Li-ion batteries. Even though the material undergoes an electronic two-phase transition upon Li-ion cell charging, LCO exhibits competitive performance in terms of rate capability. Herein the insulator-metal transition of LCO is investigated by operando Raman spectroscopy complemented with DFT calculations and a newly-developed sampling volume model. We confirm the presence of a Mott insulator α-phase at dilute Li-vacancy concentrations (x > 0.87) that transforms into a metallic β-phase at x < 0.75. In addition, we find that the charge-discharge intensity trends of LCO Raman-active bands exhibit a characteristic hysteresis, which, unexpectedly, narrows at higher cycling rates. When comparing these trends to a newly-developed numerical model of laser penetration into a spatially-heterogeneous particle we provide compelling evidence that the insulator-metal transition of LCO follows a two-phase route at very low cycling rates, which is suppressed in favor of a solid-solution route at rates above 10 mA/gLCO (~C/10). The observations explain why LCO exhibits competitive rate capabilities despite being observed to undergo an intuitively slow two-phase transition route: a kinetically faster solid-solution transition route becomes available when the active material is cycled at rates >C/10. Operando Raman spectroscopy combined with sample volume modelling and DFT calculations is shown to provide unique insights into fundamental processes governing the performance of state-of-the-art cathode materials for Li-ion batteries.

Download Full-text

ZnSnSb2 anode: A solid solution behavior enabling high rate capability in Li-ion batteries

Journal of Power Sources ◽

10.1016/j.jpowsour.2019.227165 ◽

2019 ◽

Vol 441 ◽

pp. 227165 ◽

Cited By ~ 2

Author(s):

Gaël Coquil ◽

Bernard Fraisse ◽

Stéphane Biscaglia ◽

David Aymé-Perrot ◽

Moulay T. Sougrati ◽

...

Keyword(s):

Solid Solution ◽

Rate Capability ◽

High Rate ◽

Li Ion Batteries ◽

High Rate Capability ◽

Solution Behavior ◽

Li Ion

Download Full-text

Crystal Structures and Electrochemistry of Li2MnO3-LiCoO2-LiCrO2 Solid-Solution as Positive Electrode Material for Li-Ion Batteries

ECS Meeting Abstracts ◽

10.1149/ma2010-03/1/611 ◽

2010 ◽

Keyword(s):

Solid Solution ◽

Crystal Structures ◽

Electrode Material ◽

Positive Electrode ◽

Li Ion Batteries ◽

Positive Electrode Material ◽

Li Ion

Download Full-text

Diffraction studies of Tavorite-based polyanionic materials for Li–ion batteries

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273314096430 ◽

2014 ◽

Vol 70 (a1) ◽

pp. C356-C356

Author(s):

Emmanuelle Suard ◽

Matteo Bianchini ◽

Jean-Marcel Ateba Mba ◽

Christian Masquelier ◽

Laurence Croguennec

Keyword(s):

Phase Diagram ◽

Low Voltage ◽

Ex Situ ◽

Li Ion Batteries ◽

Two Phase ◽

Whole Process ◽

Structural Framework ◽

Wide Range ◽

Li Ion ◽

Battery Discharge

Polyanionic materials attract great interest in the field of Li-ion batteries thanks to the wide range of possible available compositions, resulting in a great amount of different properties (1). For instance, the high working potential together with a capacity of 156 mAh/g (leading to a theoretical energy density of 655 Wh/g) made Tavorite LiVPO4F a widely studied material and a suitable candidate for commercial exploitation. Here we will focus our interest on the homeotype structure of LiVPO4O. This oxy-phosphate shows the ability to exploit two redox couples, V5+/V4+ at 3.95 V vs. Li+/Li and V4+/V3+ at an average potential of 2.3 V vs. Li+/Li upon Li+ extraction and insertion, respectively (2). The two domains show marked differences both in the electrochemical signature and in the phase diagram, which is extremely rich. In particular, while the high-voltage domain shows a relatively simple two-phase transformation between LiVPO4O and ε-VPO4O, the low-voltage domain is more complicated and it shows a series of three apparent biphasic reactions while Lithium is inserted in the Tavorite structural framework. To elucidate this reaction, we performed in-situ X-Ray diffraction (Kα1), i.e. we recorded the whole process in real time during battery discharge. The end member Li2VPO4O was also isolated ex-situ and its crystal structure determined for the first time thanks to neutron diffraction measurements (3). Both the phase diagram and the different crystal structures will be discussed.

Download Full-text

Iron Oxides as Anodic Materials in Li Rechargeable Batteries

MRS Proceedings ◽

10.1557/proc-548-71 ◽

1998 ◽

Vol 548 ◽

Cited By ~ 5

Author(s):

M. J. Duncan ◽

L. F. Nazar

Keyword(s):

Solid Solution ◽

Reversible Capacity ◽

Rechargeable Batteries ◽

Parent Material ◽

Li Ion Batteries ◽

Electronic Density ◽

Open Framework ◽

Li Ion ◽

Cutoff Voltage ◽

Oxide Matrix

ABSTRACTThe open framework material, CaFe204 and the isostructural solid solution phases, LiyCa1−(x+y)/2SnxFe2−xO4, where 0<y<x and O<x<0.6 have been evaluated as promising anodic materials in Li-ion batteries. These materials can be discharged to low potential, the end member CaFe2O4 attaining a discharge capacity of 800 mAh/g at a cutoff voltage of 50 mV. The capacity is enhanced on substitution of Fe3+, for Sn4+ in the framework (920 mAh/g for the composition, Li0.6Ca0.4Sn0.6Fe1.404). On introducing Sn into the structure the reversible capacity is also substantially increased compared with the parent material. Although there is a large irreversible component to the redox process during first discharge-charge, the materials can sustain a stable reversible capacity of >600 mAh/g within the voltage window of 3.0-0.005 V. The profile of the electronic density plots suggest there is no phase separation to Li/Sn alloy phases on reduction, but rather a lithium-rich, oxygen deficient Sn/Fe/oxide matrix is formed.

Download Full-text

Direct X-Ray Imaging as a Tool for Understanding Multiphysics Phenomena in Energy Storage

Journal of Electrochemical Energy Conversion and Storage ◽

10.1115/1.4034415 ◽

2016 ◽

Vol 13 (3) ◽

Cited By ~ 3

Author(s):

George J. Nelson ◽

Zachary K. van Zandt ◽

Piyush D. Jibhakate

Keyword(s):

Energy Storage ◽

Lithium Ion ◽

Ex Situ ◽

Storage Device ◽

Li Ion Batteries ◽

X Ray ◽

X Ray Imaging ◽

Wide Range ◽

Li Ion ◽

Insight Into

The lithium-ion battery (LIB) has emerged as a key energy storage device for a wide range of applications, from consumer electronics to transportation. While LIBs have made key advancements in these areas, limitations remain for Li-ion batteries with respect to affordability, performance, and reliability. These challenges have encouraged the exploration for more advanced materials and novel chemistries to mitigate these limitations. The continued development of Li-ion and other advanced batteries is an inherently multiscale problem that couples electrochemistry, transport phenomena, mechanics, microstructural morphology, and device architecture. Observing the internal structure of batteries, both ex situ and during operation, provides a critical capability for further advancement of energy storage technology. X-ray imaging has been implemented to provide further insight into the mechanisms governing Li-ion batteries through several 2D and 3D techniques. Ex situ imaging has yielded microstructural data from both anode and cathode materials, providing insight into mesoscale structure and composition. Furthermore, since X-ray imaging is a nondestructive process studies have been conducted in situ and in operando to observe the mechanisms of operation as they occur. Data obtained with these methods has also been integrated into multiphysics models to predict and analyze electrode behavior. The following paper provides a brief review of X-ray imaging work related to Li-ion batteries and the opportunities these methods provide for the direct observation and analysis of the multiphysics behavior of battery materials.

Download Full-text