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Types of Electrochemical Energy Storage Devices
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Researchers are increasingly paying attention to sustainable methods for storing energy. Many researchers are now concentrating their efforts on the development and exploration of novel materials for use in energy storage devices due to the limited supply of existing energy sources such as oil, coal, and natural gas, and escalating regional tensions. Because of these issues, sustainable renewable energy sources have been touted as an alternative to nonrenewable fuels. Deployment of renewable energy sources requires efficient and reliable energy storage devices due to their intermittent nature. High-performance electrochemical energy storage technologies with high power and energy densities are heralded to be the next-generation storage devices. Transition metal chalcogenides (TMCs) have sparked interest among electrode materials because of their intriguing electrochemical properties.

Chalcogenides electrochemical energy storage Batteries Supercapacitors
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Update Date: 09 Jun 2022
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    1. Batteries

    An electrochemical battery energy storage solution is required for our sustainable future. For decades, rechargeable batteries have been transforming the battery industry. These rechargeable batteries, including Li-ion, Pb–acid, Ni metal-hydride, and Ni-Cd batteries, dominate the global market. Lithium-ion batteries are currently the norm in the battery industry. Li-ion batteries are made up of four major components: a cathode, an anode, an electrolyte, and a separator. This is depicted in Figure 1.
    Figure 1. Schematic of the structure and working mechanism of Li-ion batteries.
    While graphite is often used for the anode electrode, lithium metal oxides or phosphates, such as LiCoO2 and LiFePO4, are commonly used for the cathode electrode. In order to maintain charge balance, electrons migrate from the anode to the cathode during discharge, which implies Li-ions flow through the electrolyte and cross over the separator. On the other hand, the charging process is triggered by a charging power source, which causes the Li ions to migrate in the opposite direction [1]. As previously mentioned, one of the most important components of electrochemical Li-ion batteries is the electrode materials, which significantly impact battery performance. Therefore, it is important to review the role of chalcogenides in the synthesis and design of appropriate electrode material for high-performance Li-ion batteries. A closely related lithium element is sodium (group 1 element). Hence sodium-ion batteries have been investigated as an alternative sustainable energy storage solution. Because Na-ion has a larger atomic radius compared to Li-ion, they are expected to migrate at a slower rate [2]. However, reports demonstrated that the migration barrier could be shortened for a layered structured system [3][4][5].
    Figure 2 illustrates the structure of Na-ion batteries showing the materials for the four major components: a cathode, an anode, an electrolyte, and binders. Investigating the potential of Na-ion batteries as an alternative electrochemical energy storage device is critical in the development of sustainable, innovative storage systems.
    Figure 2. Schematic of the structure and illustration of a Na-ion battery system.
    While investigating the electrochemical performance and environmental friendliness of several new electrode materials, most Na-ion batteries and, to a large extent, Li-ion batteries focused on transition metal sulfides-based materials such as cobalt sulfides, and iron sulfides, nickel sulfides, and tin sulfides. The storage of Na-ions in metal sulfide materials depends on the transition metal elements that are present in the metal sulfide materials. Developing new electrode materials with specific structures necessitates a thorough understanding of Na-ion transport properties in various electrode materials. The importance of understanding the role of chalcogenides in the synthesis and design of acceptable electrode materials for high-performance Na-ion batteries cannot be overstated.
    As with so many other battery energy storage solutions for our sustainable future, there is a continuing desire for new technologies with higher storage capacities and fewer demands on critical minerals. Metal–Sulfur batteries have recently received significant attention [7]. In theory, lithium-sulfur batteries, for example, could store five times as much energy as lithium-ion batteries. Similar to other electrochemical batteries, lithium-sulfur batteries are made of two electrodes (lithium anode and sulfur cathode), a separator, and an electrolyte (either solid or liquid). The fundamental charging and discharging process is depicted in Figure 3, and it is governed by the equation S+2LiLi2S. From Figure 3, lithium metal is oxidized to Li+ at the anode, and sulfur is reduced to lithium sulfide (Li2S) at the cathode during the discharge process. Lithium-sulfur batteries have several drawbacks, the most significant of which are their short cycle life, low utilization of active materials, early failure due to electrical shorting, and anode rechargeability. Another considerable drawback that has received more attention is the suppression of the polysulfide shuttle in lithium-sulfur batteries. According to a study, the effects of polysulfide shuttle can be mediated by including polysulfide absorbent and mediators as part of the cathode material [8]. Several strategies have been used to suppress polysulfide shuttle effects, including the use of electrolyte additives at the anode, the use of porous layers to impede diffusion, the use of a selective electrolyte separator, and the encapsulation of polysulfides at the cathode [9][10].
    Figure 3. Schematic diagram of a Li–S cell structure with charge/discharge operations. 
    The ideal material for electrochemical energy storage must exhibit superior electrochemical properties. The electrochemical performance of electrode materials is mostly determined by the composition and structure/morphology of the materials. There has been a lot of interest in electrocatalysts of chalcogenides because of their intrinsic electrochemical activities [11][12]. Transition metal dichalcogenide (molybdenum disulfide) was utilized as a catalyst in a study to convert polysulfides into a sulfur cathode because of its inherent sulfur deficiencies. Nanocomposites of MoS2−x nanoflakes were created on thin films of reduced graphene oxide utilizing co-dispersion and filtration processes. The steps in the preparation of MoS2−x/rGO are depicted in Figure 4. Surface sulfur deficiency at the cathode had a favourable effect on the kinetics of polysulfide shuttling. As a result, the nanocomposite sulfur cathode with only a small amount of MoS2−x/rGO (4%) exhibited a high-rate capability and a long cycle life. This emphasizes the importance of designing cathode material composition and structure/morphology to improve the electrochemical performance of emerging technologies [13].
    Figure 4. (A) Schematic of the synthesis of the MoS2−x/rGO composite and the conversion of Li2Sx on the MoS2−x/rGO surface. TEM images of (B) a thin GO film and (C) MoS2 nanoflakes. (D) HRTEM image of MoS2 nanoflakes.
    Metal–Air batteries have also demonstrated enormous potential in the field of electrochemical energy storage systems. A conventional metal-air battery consists of a metal electrode, an air-breathing cathode, and a lithium salt-containing electrolyte. The anode of metal-air batteries can be made using low-cost, environmentally friendly elements, such as Fe, Na, Al, and Zn. Metal–Air batteries are both safer and offer comparable energy density. Figure 5 shows the theoretical energy density and specific energy of commonly published metal-air batteries.
    Figure 5. Theoretical energy density and specific energy (including oxygen) of commonly researched metal-air batteries.
    In a conventional metal-air battery structure (Figure 6), metal is converted to ions at the anode, while oxygen is transformed into hydroxide ions at the cathode. The utilization of air (ambient oxygen) has the extra benefit of lowering costs and simplifying cell construction. Metal–Air batteries such as Li-air battery [15][16], Na–air battery [17][18], Al–air battery [19][20], Mg–air battery [21][22], Zn–air battery [23][24], Fe–air battery [25][26][27]. Sn–air battery has widely been published, and the electrochemical performance and prospects of improved specific power and specific energy are well established. Indeed, the prospects of using metal chalcogenides as a possible anodic material offer a green and sustainable solution. In this vain, Lyu et al. [28] used a hybrid CoS2/rGO cathode catalyst to fabricate Li–O2 batteries. The electrodes exhibited high-rate performance. Furthermore, cobalt sulfide nanoparticles coated on graphene nanosheets have been shown to produce Zn–air batteries with outstanding cycling stability and high rechargeability [29].
    Figure 6. Schematic representation of metal-air batteries with aqueous (upper, blue) and nonaqueous (below, green) electrolytes. 

    2. Supercapacitors

    Electrochemical energy storage systems such as supercapacitors offer tremendous opportunities for clean energy storage. They comparatively offer high power density, long cycle life, and fast charging. It is expected that next-generation storage devices will be dominated by electrochemical storage systems. The development of electrochemical energy storage systems with superior energy requires novel electrode materials, and these electrode materials are critical to the electrochemical performance of the storage device. In this section, the supercapacitors that are based on chalcogenides electrodes will be introduced. A manufactured supercapacitor can be classified as symmetric or asymmetric based on the configuration of the electrodes. The anodic and cathodic electrode materials in symmetric supercapacitors are identical, whereas the anodic and cathodic electrode materials in asymmetric supercapacitors are distinct. Asymmetric supercapacitors have a significantly greater potential range. This has made it more appealing. When it comes to supercapacitors, the electrode is the most critical component. For a supercapacitor to have improved electrochemical performance, the materials that are utilized to construct the electrodes must be of high performance. Scientists are attempting to develop low-cost electrode materials that have a high specific surface area, good electronic conductivity, and are stable.
    The electrochemical activity of TMCs significantly influences the effectiveness of electrodes used for supercapacitor electrodes. The electrochemical activity of the electrode material regulates electrochemical performance, such as energy density and power density. Many factors influence supercapacitor electrochemical performance, including nanostructure orientation and bond mechanisms. Even though several innovative materials (for example, metal oxides) have demonstrated considerable potential as supercapacitor electrodes, several of them have also demonstrated significant limitations [31][32].
    Therefore, it is essential to investigate novel electrode materials that exhibit superior electrochemical performance. A possible approach in this regard is the employment of chalcogenides, which operate based on a pseudocapacitive (fast reversible redox mechanism) or hybrid (combination of charge accumulation and fast reversible redox mechanism) charge storage mechanism to store and release electrochemical energy. Chalcogenides, especially metal sulfides, metal selenides, metal tellurides, etc., have been widely applied in supercapacitor applications due to their excellent electrochemical activity. Despite this, there are a few drawbacks to using chalcogenides as an electrode material, including low conductivity, poor cyclability, a low surface area, and aggregation problems [33][34][35]. Several synthesis approaches have been used to create electrodes with high surface area by utilizing nanostructured features such as nanowires, nanorods, and nanobelts. However, to attain improved electronic conductivity and stability, the use of different active materials must be investigated.
    In a reported attempt to improve the electrochemical activity by improving the surface area, chalcogenides based supercapacitors, ternary metal chalcogenides hybrid supercapacitors (MX; M = Zn–Co–Ni; X = S, Se, Te) were fabricated [36]. On nickel-based substrates, a well-organized nanostructured needlelike feature that looks similar to sea urchins was fabricated. The sample had a lot of voids and exhibited improved specific capacitance and stability. By using selenization, tellurization, and sulfurization of precursors, the morphology of the sample could be altered to affect the specific capacitance. Some chalcogenides-based electrode material exhibits inherently high electronic conductivity [37][38]. For example, MoS2 has a lower electronic conductivity compared to WS2; to tackle this, researchers have employed different synthesis methods to fabricate various nanostructured electrodes for supercapacitor applications.
    Furthermore, other nanocomposites have been investigated to improve electronic conductivity [39][40][41][42]. Teli et al. produced an interconnected crumpled-nanoflake structured MoS2 on Ni foam using a one-step electrodeposition method [37]. The fabricated electrodes exhibited diffusion-controlled or capacitive-controlled charge storage kinetics and excellent coulombic efficiency. When employed as an electrode material for supercapacitor applications, WS2/α-NiMoO4 composite electrodes with nano/micro cavity-like hierarchical architecture exhibited high specific areas with increased pore size, superior electrical conductivity, and improved stability [43]. Cobalt sulfide (CoS) has generated much research attention because they are low-cost and possess a weak Co–S bond that exhibits theoretically high capacitance. As a result of these properties, transition metal sulfides for use in supercapacitor applications have been developed. For example, Zhang’s research group fabricated CoS nanowires on layered Ti3C2Tx using the solvothermal method [43]. With the Ti3C2Tx layer providing large interlayer spacing, improved conductivity, and chemical diversity on the surface, the samples exhibited remarkably improved electrochemical performance. In another research, 2D hierarchical MoS2 lamella inserted in the CoS2 flake was fabricated. The 2D MoS2 multilayers provided support preventing interlayer expansion and structural collapse. The electrochemical performance and cyclic stability of these chalcogenides can be improved with secondary support [44]. Other typical chalcogenides [45][46][47][48][49][50][51][52][53] also demonstrated great potential for supercapacitor applications. 


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      Mensah-Darkwa, K.; Gupta, R.K.; Ampong, D.N.; Agyekum, E.; Souza, F.M.D. Types of Electrochemical Energy Storage Devices. Encyclopedia. Available online: (accessed on 07 February 2023).
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