Inorganic solid Li ion conductors: An overview

Knauth, Philippe

doi:10.1016/j.ssi.2009.03.022

Cited by 1,099 publications

(894 citation statements)

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“…The (PEO/ANF) 200 membrane was immersed in a 1 M lithium triflate solution and 1 M lithium bis(trifluoromethane)sulfonimide solution in a propylene carbonate/dimethyl carbonate 1:1 v/v mixture, followed by overnight drying in a vacuum oven. The ionic conductivity of (PEO/ANF) 200 was subsequently found to be 5.5 Â 10 À 5 and 2.5 Â 10 À 5 S cm À 1 , comparable to that of some Li sulfide glasses 10,24 . Electrochemical impedance spectroscopy curves showed a depressed semicircle shape ( Supplementary Fig.…”

Section: Barementioning

confidence: 67%

“…Besides having adequate mechanical and ion transport properties, we must also considerably improve temperature resilience of current ICMs because high ionic currents will inevitably result in higher energy dissipation in a smaller volume. De facto the new ICMs to be paired with new anodes and cathodes must combine the advantages of ion-conducting glasses 10 and polymers 11 in one material. Resolution of these challenges essentially equates to finding new approaches to the materials engineering of ICMs involving new processes to synthesize them as well as novel ICM components.…”

mentioning

confidence: 99%

“…Solid electrolytes based on Li-based ceramics represent one of the currently most advanced ion conductors available 10,24,25 . They combine high mechanical stiffness (E ¼ 80-100 GPa) and high ionic conductivity (O ICM from 10 À 3 S cm À 1 (refs 10,24) to 1.2 Â 10 À 2 S cm À 1 ) 25 .…”

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A dendrite-suppressing composite ion conductor from aramid nanofibres

et al. 2015

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Dendrite growth threatens the safety of batteries by piercing the ion-transporting separators between the cathode and anode. Finding a dendrite-suppressing material that combines high modulus and high ionic conductance has long been considered a major technological and materials science challenge. Here we demonstrate that these properties can be attained in a composite made from Kevlar-derived aramid nanofibres assembled in a layer-by-layer manner with poly(ethylene oxide). Importantly, the porosity of the membranes is smaller than the growth area of the dendrites so that aramid nanofibres eliminate 'weak links' where the dendrites pierce the membranes. The aramid nanofibre network suppresses poly(ethylene oxide) crystallization detrimental for ion transport, giving a composite that exhibits high modulus, ionic conductivity, flexibility, ion flux rates and thermal stability. Successful suppression of hard copper dendrites by the composite ion conductor at extreme discharge conditions is demonstrated, thereby providing a new approach for the materials engineering of solid ion conductors.

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Section: Barementioning

confidence: 67%

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confidence: 99%

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A dendrite-suppressing composite ion conductor from aramid nanofibres

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“…Ionic conductors take on an essential rôle in materials science [1,2]. They constitute an important part in many devices such as sensors [3] and those constructed for electrochemical energy storage [4,5].…”

Section: Introductionmentioning

confidence: 99%

F anion dynamics in cation-mixed nanocrystalline LaF3: SrF2

2018

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Ion dynamics in nanocrystalline materials can be quite different compared to that in materials with lm-sized crystallites. In particular, the substitution of isoor aliovalent ions opens pathways to systematically control ion transport properties. Here we studied the incorporation of SrF 2 into the tysonite structure of LaF 3 and its effect on F À transport. High-energy ball milling directly transforms the binary fluorides in a structurally disordered, phase pure nanocrystalline ceramic. Compared to Sr-free LaF 3 , ionic conductivity could be increased by several orders of magnitude. We attribute this enhancement to the generation of lattice strain and the formation of F defect sites. In agreement with this increase, the activation energy E a of long-range ionic transport in the solid solution La 1Àx Sr x F 3Àx significantly decreases from 0.75 eV (x ¼ 0) to 0.49 eV (x ¼ 0:1).

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“…However, until recently, known solid electrolytes, such as the garnet Li 7 La 3 Zr 2 O 12 and the perovskite Li 3x La 2/3 − x TiO 3 (0 ⩽ x ⩽ 0.16), have Li + conductivities that are at least 1-2 orders of magnitude lower compared with those of organic liquid electrolytes. 20,21 The discovery of the Li 10 GeP 2 S 12 superionic conductor by Kamaya et al 22 in 2011, with the highest ever reported Li + conductivity of 12 mS cm − 1 , has provided renewed hope for the development of solid ceramic electrolytes with comparable transport properties with flammable organic electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Computational studies of solid-state alkali conduction in rechargeable alkali-ion batteries

Deng

Ong

2016

NPG Asia Mater

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The facile conduction of alkali ions in a crystal host is of crucial importance in rechargeable alkali-ion batteries, the dominant form of energy storage today. In this review, we provide a comprehensive survey of computational approaches to study solid-state alkali diffusion. We demonstrate how these methods have provided useful insights into the design of materials that form the main components of a rechargeable alkali-ion battery, namely the electrodes, superionic conductor solid electrolytes and interfaces. We will also provide a perspective on future challenges and directions. The scope of this review includes the monovalent lithium-and sodium-ion chemistries that are currently of the most commercial interest. NPG Asia Materials (2016) 8, e254; doi:10.1038/am.2016.7; published online 25 March 2016 INTRODUCTIONThe facile conduction of alkali ions in a crystal is of critical importance in energy storage. Today, the dominant form of energy storage in consumer electronics is the rechargeable lithium-ion (Li-ion) battery, 1-5 a device that functions entirely on the basis of the reversible transport of Li + ions. With one of the highest energy densities of known energy storage technologies, Li-ion batteries are finding increasingly large-scale applications in electrified transportation and grid storage. In recent years, there has also been a resurgence of interest in rechargeable sodium-ion (Na-ion) batteries, 6-12 which function on the same basic principle but with Na + instead of Li + because of concerns regarding the abundance and cost of lithium. Figure 1 shows a representation of a rechargeable alkali-ion battery. The typical electrode in an alkali-ion battery is an intercalation compound, which, as the name implies, stores alkali ions by inserting them into its crystal structure in a topotactic manner. During discharge, A + ions are transported from the anode, through the electrolyte and into the cathode. The reverse happens during charge. Throughout this review, we will adopt the customary terminology of defining the 'cathode' as the positive electrode during discharge, even though the formal definition of the cathode changes depending on whether the charging or discharging process is being referred to. Current cathodes are typically transition metal oxides, and the insertion/removal of each A + in the cathode is accompanied by the concomitant reduction/oxidation of a transition metal ion to accommodate the compensating insertion/removal of an electron. Graphitic carbon is the most common anode.The performance of a rechargeable alkali-ion battery depends crucially on the ease with which alkali ions move in the host crystal of the cathode and anode, in the electrolyte, and in the electrodeelectrolyte interface. Poor alkali transport in any part of the battery

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Inorganic solid Li ion conductors: An overview

Cited by 1,099 publications

References 42 publications

A dendrite-suppressing composite ion conductor from aramid nanofibres

A dendrite-suppressing composite ion conductor from aramid nanofibres

F anion dynamics in cation-mixed nanocrystalline LaF3: SrF2

Computational studies of solid-state alkali conduction in rechargeable alkali-ion batteries

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