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In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions. These can be simple ions such as the sodium (Na+) and chloride (Cl−) in sodium chloride, or polyatomic species such as the ammonium (NH+
4) and carbonate (CO2−
3) ions in ammonium carbonate. Individual ions within an ionic compound usually have multiple nearest neighbours, so are not considered to be part of molecules, but instead part of a continuous three-dimensional network. Ionic compounds usually form crystalline structures when solid.
Silver iodide is an inorganic compound with the formula AgI. The compound is a bright yellow solid, but samples almost always contain impurities of metallic silver that give a gray coloration. The silver contamination arises because AgI is highly photosensitive. This property is exploited in silver-based photography. Silver iodide is also used as an antiseptic and in cloud seeding.
Silver bromide (AgBr) is a soft, pale-yellow, water-insoluble salt well known for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in photographic films and is believed by some to have been used for making the Shroud of Turin. The salt can be found naturally as the mineral bromargyrite.
A proton conductor is an electrolyte, typically a solid electrolyte, in which H+ are the primary charge carriers.
Ionic radius, rion, is the radius of a monatomic ion in an ionic crystal structure. Although neither atoms nor ions have sharp boundaries, they are treated as if they were hard spheres with radii such that the sum of ionic radii of the cation and anion gives the distance between the ions in a crystal lattice. Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values range from 31 pm (0.3 Å) to over 200 pm (2 Å).
Nanoionics is the study and application of phenomena, properties, effects, methods and mechanisms of processes connected with fast ion transport (FIT) in all-solid-state nanoscale systems. The topics of interest include fundamental properties of oxide ceramics at nanometer length scales, and fast ion conductor /electronic conductor heterostructures. Potential applications are in electrochemical devices for conversion and storage of energy, charge and information. The term and conception of nanoionics were first introduced by A.L. Despotuli and V.I. Nikolaichik in January 1992.
Beta-alumina solid electrolyte (BASE) is a fast ion conductor material used as a membrane in several types of molten salt electrochemical cell. Currently there is no known substitute available. β-Alumina exhibits an unusual layered crystal structure which enables very fast ion transport. β-Alumina is not an isomorphic form of aluminium oxide (Al2O3), but a sodium polyaluminate. It is a hard polycrystalline ceramic, which, when prepared as an electrolyte, is complexed with a mobile ion, such as Na+, K+, Li+, Ag+, H+, Pb2+, Sr2+ or Ba2+ depending on the application. β-Alumina is a good conductor of its mobile ion yet allows no non-ionic (i.e., electronic) conductivity. The crystal structure of the β-alumina provides an essential rigid framework with channels along which the ionic species of the solid can migrate. Ion transport involves hopping from site to site along these channels. Since the 1970's this technology has been thoroughly developed, resulting in interesting applications. Its special characteristics on ion and electrical conductivity make this material extremely interesting in the field of energy storage.
Thallium(I) iodide is a chemical compound with the formula TlI. It is unusual in being one of the few water-insoluble metal iodides, along with AgI, CuI, SnI2, SnI4, PbI2 and HgI2.
In materials science, fast ion conductors are solid conductors with highly mobile ions. These materials are important in the area of solid state ionics, and are also known as solid electrolytes and superionic conductors. These materials are useful in batteries and various sensors. Fast ion conductors are used primarily in solid oxide fuel cells. As solid electrolytes they allow the movement of ions without the need for a liquid or soft membrane separating the electrodes. The phenomenon relies on the hopping of ions through an otherwise rigid crystal structure.
Ionic conductivity is a measure of a substance's tendency towards ionic conduction. Ionic conduction is the movement of ions. The phenomenon is observed in solids and solutions. Ionic conduction is one mechanism of current.
Rubidium silver iodide is a ternary inorganic compound with the formula RbAg4I5. Its conductivity involves the movement of silver ions within the crystal lattice. It was discovered while searching for chemicals which had the ionic conductivity properties of alpha-phase silver iodide at temperatures below 146 °C for AgI.
Solid-state ionics is the study of ionic-electronic mixed conductor and fully ionic conductors and their uses. Some materials that fall into this category include inorganic crystalline and polycrystalline solids, ceramics, glasses, polymers, and composites. Solid-state ionic devices, such as solid oxide fuel cells, can be much more reliable and long-lasting, especially under harsh conditions, than comparable devices with fluid electrolytes.
LISICON is an acronym for LIthiumSuper Ionic CONductor, which refers to a family of solids with the chemical formula Li2+2xZn1−xGeO4.
NASICON is an acronym for sodium (Na) Super Ionic CONductor, which usually refers to a family of solids with the chemical formula Na1+xZr2SixP3−xO12, 0 < x < 3. In a broader sense, it is also used for similar compounds where Na, Zr and/or Si are replaced by isovalent elements. NASICON compounds have high ionic conductivities, on the order of 10−3 S/cm, which rival those of liquid electrolytes. They are caused by hopping of Na ions among interstitial sites of the NASICON crystal lattice.
Antiperovskites is a type of crystal structure similar to the perovskite structure that is common in nature. The key difference is that the positions of the cation and anion constituents are reversed in the unit cell structure. In contrast to perovskite, antiperovskite compounds consist of two types of anions coordinated with one type of cation. Antiperovskite compounds are an important class of materials because they exhibit interesting and useful physical properties not found in perovskite materials, including as electrolytes in solid-state batteries.
Caesium bisulfate or cesium hydrogen sulfate is an inorganic compound with the formula CsHSO4. The caesium salt of bisulfate, it is a colorless solid obtained by combining Cs2SO4 and H2SO4.
The telluride iodides are chemical compounds that contain both telluride ions (Te2−) and iodide ions (I−). They are in the class of mixed anion compounds or chalcogenide halides.
A solid-state electrolyte (SSE) is a solid ionic conductor and electron-insulating material and it is the characteristic component of the solid-state battery. It is useful for applications in electrical energy storage (EES) in substitution of the liquid electrolytes found in particular in lithium-ion battery. The main advantages are the absolute safety, no issues of leakages of toxic organic solvents, low flammability, non-volatility, mechanical and thermal stability, easy processability, low self-discharge, higher achievable power density and cyclability. This makes possible, for example, the use of a lithium metal anode in a practical device, without the intrinsic limitations of a liquid electrolyte thanks to the property of lithium dendrite suppression in the presence of a solid-state electrolyte membrane. The utilization of a high capacity anode and low reduction potential, like lithium with a specific capacity of 3860 mAh g−1 and a reduction potential of -3.04 V vs SHE, in substitution of the traditional low capacity graphite, which exhibits a theoretical capacity of 372 mAh g−1 in its fully lithiated state of LiC6, is the first step in the realization of a lighter, thinner and cheaper rechargeable battery. Moreover, this allows the reach of gravimetric and volumetric energy densities, high enough to achieve 500 miles per single charge in an electric vehicle. Despite the promising advantages, there are still many limitations that are hindering the transition of SSEs from academia research to large-scale production, depending mainly on the poor ionic conductivity compared to that of liquid counterparts. However, many car OEMs (Toyota, BMW, Honda, Hyundai) expect to integrate these systems into viable devices and to commercialize solid-state battery-based electric vehicles by 2025.
Lithium aluminium germanium phosphate, typically known with the acronyms LAGP or LAGPO, is an inorganic ceramic solid material whose general formula is Li
1+xAl
xGe
2-x(PO
4)
3. LAGP belongs to the NASICON family of solid conductors and has been applied as a solid electrolyte in all-solid-state lithium-ion batteries. Typical values of ionic conductivity in LAGP at room temperature are in the range of 10–5 - 10–4 S/cm, even if the actual value of conductivity is strongly affected by stoichiometry, microstructure, and synthesis conditions. Compared to lithium aluminium titanium phosphate (LATP), which is another phosphate-based lithium solid conductor, the absence of titanium in LAGP improves its stability towards lithium metal. In addition, phosphate-based solid electrolytes have superior stability against moisture and oxygen compared to sulfide-based electrolytes like Li
10GeP
2S
12 (LGPS) and can be handled safely in air, thus simplifying the manufacture process. Since the best performances are encountered when the stoichiometric value of x is 0.5, the acronym LAGP usually indicates the particular composition of Li
1.5Al
0.5Ge
1.5(PO
4)
3, which is also the typically used material in battery applications.
Phosphide iodides or iodide phosphides are compounds containing anions composed of iodide (I−) and phosphide (P3−). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the phosphide chlorides, arsenide iodides antimonide iodides and phosphide bromides.
References
- ↑ Despotuli, Andreeva and Rambaby (June 7, 2006). "Nanoionics of advanced superionic conductors". Ionics. 11 (3–4): 306–314. doi:10.1007/BF02430394. S2CID 53352333.
- ↑ Geller, S. (1967-07-21). "Crystal Structure of the Solid Electrolyte, RbAg4I5". Science. 157 (3786): 310–312. Bibcode:1967Sci...157..310G. doi:10.1126/science.157.3786.310. ISSN 0036-8075. PMID 17734228. S2CID 44294829.
- ↑ Geller, S. (1979-01-01). "Crystal structure and conductivity of the solid electrolyte". Physical Review B. 19 (10): 5396–5402. doi:10.1103/PhysRevB.19.5396.
- ↑ Hull, S; Keen, D.A; Sivia, D.S; Berastegui, P (2002). "Crystal Structures and Ionic Conductivities of Ternary Derivatives of the Silver and Copper Monohalides". Journal of Solid State Chemistry. 165 (2): 363–371. doi:10.1006/jssc.2002.9552.
- ↑ Lichkova, N. V.; Despotuli, A. L.; Zagorodnev, V. N.; Minenkova, N. A.; Shakhlevich, K. V. (1989-01-01). "Ionic conductivity of solid electrolytes in two- and three-component glass forming systems AgX-CsX (X=Cl, Br, I)". Ehlektrokhimiya (in Russian). 25 (12): 1636–1640. ISSN 0424-8570.
- ↑ Studenyak, I. P.; Kranjčec, M.; Bilanchuk, V. V.; Kokhan, O. P; Orliukas, A. F.; Kezionis, A.; Kazakevicius, E.; Salkus, T. (2009-12-01). "Temperature variation of electrical conductivity and absorption edge in Cu7GeSe5I advanced superionic conductor". Journal of Physics and Chemistry of Solids. 70 (12): 1478–1481. Bibcode:2009JPCS...70.1478S. doi:10.1016/j.jpcs.2009.09.003.
- ↑ Despotuli, A.L.; Zagorodnev, V.N.; Lichkova, N.V.; Minenkova, N.A. (1989). "New high conductive CsAg4Br1−xI2+x (0.25 < x <1) solid electrolytes". Soviet Physics - Solid State. 31: 242–244.
- ↑ Funke, Klaus; Banhatti, Radha D.; Wilmer, Dirk; Dinnebier, Robert; Fitch, Andrew; Jansen, Martin (2006-03-01). "Low-Temperature Phases of Rubidium Silver Iodide: Crystal Structures and Dynamics of the Mobile Silver Ions". The Journal of Physical Chemistry A. 110 (9): 3010–3016. doi:10.1021/jp054807v. ISSN 1089-5639. PMID 16509622.
- ↑ Chang, Jen-Hui; Zürn, Anke; von Schnering, Hans Georg (2008-10-01). "Hyperbolic Cation Diffusion Paths in α-RbAg4I5 Type Superionic Conductors". Zeitschrift für Anorganische und Allgemeine Chemie. 634 (12–13): 2156–2160. doi:10.1002/zaac.200800343. ISSN 1521-3749.
- ↑ Akin, Mert; Wang, Yuchen; Qiao, Xiaoyao; Yan, Zhiwei; Zhou, Xiangyang (20 September 2020). "Effect of relative humidity on the reaction kinetics in rubidium silver iodide based all-solid-state battery". Electrochimica Acta. 355: 136779. doi:10.1016/j.electacta.2020.136779.
- ↑ Александр Деспотули, Александра Андреева (2007). Высокоёмкие конденсаторы для 0,5 вольтовой наноэлектроники будущего (PDF). Современная Электроника (in Russian) (7): 24–29. Retrieved 2007-11-02.Alexander Despotuli, Alexandra Andreeva (2007). "High-capacity capacitors for 0.5 voltage nanoelectronics of the future" (PDF). Modern Electronics (7): 24–29. Retrieved 2007-11-02.
- ↑ Wang, Yuchen; Akin, Mert; Qiao, Xiaoyao; Yan, Zhiwei; Zhou, Xiangyang (September 2021). "Greatly enhanced energy density of all‐solid‐state rechargeable battery operating in high humidity environments". International Journal of Energy Research. 45 (11): 16794–16805. doi:10.1002/er.6928.