Improvement of electrochemical properties of Li1.1Al0.05Mn1.85O4 achieved by an AlF3 coating

Lee, Dong-Ju; Lee, Kisoo; Myung, Seung‐Taek; Yashiro, Hitoshi; Sun, Yang Kook

doi:10.1016/j.jpowsour.2010.09.040

Cited by 58 publications

(40 citation statements)

References 29 publications

(34 reference statements)

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“…But in the process of charging and discharging, the capacity of pure lithium manganese oxide will decay due to several factors such as Jahn-Teller distortion occurring on the surface of the particles and manganese dissolution into the electrolyte, especially at elevated temperatures. To overcome these drawbacks, two strategies were mainly pursued: elements substitution or oxygen excess to increase the oxidation state of Mn for suppressing the Jahn-Teller effect and surface modification or coating for suppressing the dissolution of manganese into the electrolyte [4][5][6][7][8][9][10][11][12][13][14][15][16]. The substitutions of rare earth elements for partial Mn in LiMn 2 O 4 are attracting the attention of some researchers.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical performance of rare-earth doped LiMn2O4 spinel cathode materials for Li-ion rechargeable battery

Sun

Chen

et al. 2011

J Solid State Electrochem

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Spinel powders of LiMn 2−x RE x O 4 (RE = La, Ce, Nd, Sm; 0≤x≤0.1) have been synthesized by solid-phase reaction. The structure and electrochemical properties of these electrode materials were characterized by X-ray diffraction (XRD), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge experiment. The part substitution of rare-earth element RE for Mn in LiMn 2 O 4 decreases the lattice parameter, resulting in the improvement of structural stability, and decreases the charge transfer resistance during the electrochemical process of LiMn 2 O 4 . As a result, the cycle ability, 55°C high-temperature and high-rate performances of LiMn 2−x RE x O 4 electrode materials are significantly improved with increasing RE addition, compared to the pristine LiMn 2 O 4 .

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Section: Introductionmentioning

confidence: 99%

Electrochemical performance of rare-earth doped LiMn2O4 spinel cathode materials for Li-ion rechargeable battery

Sun

Chen

et al. 2011

J Solid State Electrochem

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“…12 Cathode materials can also be covered with surface coatings to limit TM dissolution. [13][14][15][16][17][18][19] Surface coatings can perform a variety of functions for different cathode materials. [20][21][22][23][24][25][26][27][28][29][30][31][32] In this work, we evaluate the ability of coating materials to contain TMs in the cathode and thereby prevent TM dissolution into the electrolyte.…”

mentioning

confidence: 99%

Lithium-Ion Cathode/Coating Pairs for Transition Metal Containment

Snydacker

Aykol

Kirklin

et al. 2016

J. Electrochem. Soc.

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For many lithium-ion cathode materials, transition metal (TM) dissolution into the electrolyte contributes to cell degradation. Cathode coatings can limit TM dissolution by containing TMs in cathode materials. We perform density functional theory calculations to evaluate cathode/coating pairs for TM containment, specifically focusing on reactive stability of coating/cathode pairs as well as TM solubility in the coating materials. We consider stability and containment of materials at both synthesis and operating conditions. We find that many cathode/coating pairs are reactive when lithiated, while other cathode-coating pairs are stable when lithiated but become reactive following delithiation. Of all the coatings that we considered, Li 3 PO 4 occupies a unique chemical position, in that its coatings on oxide cathode materials maintained equilibrium under both lithiated and delithiated conditions. Furthermore, for oxide cathode materials, the Li 3 PO 4 coatings exhibit low TM solubilities across all cathode states of charge. Our results demonstrate that Li 3 PO 4 is a promising candidate for stable coatings on oxide cathode materials to limit TM dissolution into the electrolyte. Li-ion batteries are the dominant power sources in consumer electronics, and they are emerging as cost-competitive players in lowcarbon electricity systems and vehicles. However, many technologies are encumbered by the limited durability of today's Li-ion cells. For these applications, battery manufacturers have an incentive to improve cell durability. Transition metal (TM) dissolution from the cathode is a major contributor to cell degradation during cycling and aging.1 TM dissolution from the cathode contributes directly to capacity loss by decreasing the amount of cathode material. Furthermore, TMs that dissolve from the cathode material can migrate through the electrolyte to the anode, where they can cause changes to the anode Solid Electrolyte Interphase (SEI).2,3 These changes to the SEI increase impedance, decrease cell capacity, and decrease lifespan.A variety of strategies have been used to limit degradation by TMs. Electrolyte additives have been used to control SEI formation and limit the impact of TMs in the electrolyte. 4,5 Molecules have been attached to the polymer separator to sequester TMs from the electrolyte before they reach the anode. 6 In this work, we consider upstream strategies that limit TM dissolution from the cathode into the electrolyte. These upstream strategies are complementary to other strategies, including SEI formation and TM sequestration. There are several distinct categories of strategies for limiting TM dissolution from the cathode. Electrolytes can be tailored to reduce reactivity with the cathode. 7-9Cathode materials can be doped to control the oxidation states of transition metals. 10,11 This doping can be applied to the entire cathode particle or just near the surface.12 Cathode materials can also be covered with surface coatings to limit TM dissolution. [13][14][15][16][17][18][19] Surface coati...

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“…Aluminum fluoride is a material with a similar variety of possible optical applications [149,[162][163][164]. In addition, as already mentioned, AlF 3 is a potential artificial SEI-layer for protecting both cathodes and anodes [47,143,145,[165][166][167]. Thus, AlF 3 has become a much studied ALD material in the past few years [143,145,147,149,156].…”

Section: Ald Of Metal Fluorides Using Hf As the Fluorine Sourcementioning

confidence: 97%

Metal Fluorides as Lithium-Ion Battery Materials: An Atomic Layer Deposition Perspective

2018

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Lithium-ion batteries are the enabling technology for a variety of modern day devices, including cell phones, laptops and electric vehicles. To answer the energy and voltage demands of future applications, further materials engineering of the battery components is necessary. To that end, metal fluorides could provide interesting new conversion cathode and solid electrolyte materials for future batteries. To be applicable in thin film batteries, metal fluorides should be deposited with a method providing a high level of control over uniformity and conformality on various substrate materials and geometries. Atomic layer deposition (ALD), a method widely used in microelectronics, offers unrivalled film uniformity and conformality, in conjunction with strict control of film composition. In this review, the basics of lithium-ion batteries are shortly introduced, followed by a discussion of metal fluorides as potential lithium-ion battery materials. The basics of ALD are then covered, followed by a review of some conventional lithium-ion battery materials that have been deposited by ALD. Finally, metal fluoride ALD processes reported in the literature are comprehensively reviewed. It is clear that more research on the ALD of fluorides is needed, especially transition metal fluorides, to expand the number of potential battery materials available.

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Improvement of electrochemical properties of Li1.1Al0.05Mn1.85O4 achieved by an AlF3 coating

Cited by 58 publications

References 29 publications

Electrochemical performance of rare-earth doped LiMn2O4 spinel cathode materials for Li-ion rechargeable battery

Electrochemical performance of rare-earth doped LiMn2O4 spinel cathode materials for Li-ion rechargeable battery

Lithium-Ion Cathode/Coating Pairs for Transition Metal Containment

Metal Fluorides as Lithium-Ion Battery Materials: An Atomic Layer Deposition Perspective

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