Toward a low-cost high-voltage sodium aqueous rechargeable battery

Lee, Myeong Hwan; Kim, Sung Joo; Chang, Donghee; Kim, Jin-Soo; Moon, Sehwan; Oh, Kyungbae; Park, Kyu‐Young; Seong, Won Mo; Park, Hyeokjun; Kwon, Giyun; Lee, Byungju; Kang, Kisuk

doi:10.1016/j.mattod.2019.02.004

Cited by 184 publications

(120 citation statements)

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“…[ 2c,3 ] As a consequence, many cathode compounds that can be utilized in sodium batteries were recently reported, including organic compounds, [ 4 ] polyanionic compounds, [ 5 ] and transition metal oxides. [ 6 ] Among them, manganese‐based cathode materials have attracted much attention due to their low cost and significant Earth abundance.…”

Section: Figurementioning

confidence: 99%

The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation

Chae

Kim

et al. 2020

Advanced Energy Materials

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as Li and Ni will be intensively used in large batteries for electric vehicles (EVs). These elements may be fully consumed for EV applications, so it will be impossible to have enough of them for batteries designed for large energy storage. These concerns have produced increasing interest in alternative technologies, with sodium-based storage chemistry among the leading modalities. [2] Reversible sodium intercalation received attention as one of the leading post-lithium battery technologies, as it combines several very attractive properties. Various merits are attributed to Nabased cells, in particular safety, low cost, Earth abundance, and environmental friendliness. [2c,3] As a consequence, many cathode compounds that can be utilized in sodium batteries were recently reported, including organic compounds, [4] polyanionic compounds, [5] and transition metal oxides. [6] Among them, manganese-based cathode materials have attracted much attention due to their low cost and significant Earth abundance.The tunnel-type sodium manganese oxide Na 0.44 MnO 2 is particularly attractive owing to its unique large tunnels suitable for sodium intercalation. [7] The crystal structure of Na 0.44 MnO 2 is shown in Figure 1a. There are five distinct crystallographic manganese sites and three sodium sites, where Mn(1) and Mn(2) are occupied by Mn 3+ , and Mn(3), Mn(4), and Mn (5) are occupied Mn 4+ . [8] The structural frame is built up of double and triple linear chains with edge-shared MnO 6 octahedra and single chains of edge-shared MnO 5 square-pyramids. Each chain is aligned parallel to the c-axis and connected to neighboring chains via a corner-sharing of the polyhedra, resulting in two types of tunnels: the 1D tunnels occupied by Na(1) atoms ( Figure 1b) and the 2D tunnels occupied by Na(2) and Na(3) atoms, which are positioned in large zig-zag shaped cavities (Figure 1c). Interestingly, unlike common layered oxides, such a structure is very stable in aqueous solutions, even upon electrochemical sodium intercalation/deintercalation. [7f,9] Thus, recently many publications focused on Na 0.44 MnO 2 as a particularly promising cathode material for both aqueous and nonaqueous sodium-ion batteries. [10] However, to our knowledge, their sodium storage mechanisms were not determined experimentally due to the complex multifold oxidation/reduction steps, while ab initio calculations were reported. [8] Besides that, Tunnel-type sodium manganese oxide is a promising cathode material for aqueous/nonaqueous sodium-ion batteries, however its storage mechanism is not fully understood, in part due to the complicated sodium intercalation process. In addition, low cyclability due to manganese dissolution has limited its practical application in rechargeable batteries. Here, the intricate sodium intercalation mechanism of Na 0.44 MnO 2 is revealed by combination of electrochemical characterization, structure determination from powder X-ray diffraction data, 3D bond valence difference maps, and barrier-energy calculations of the sodium ...

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Section: Figurementioning

confidence: 99%

The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation

Chae

Kim

et al. 2020

Advanced Energy Materials

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“…[ 21 ] However, the super‐concentrated electrolytes are usually based on LiTFSI, LiOTF, LiFSI, NaTFSI, NaFSI, KTFSI, KFSI, and even relatively cheap NaClO 4 , CH 3 COOK, HCOOK, and other high‐solubility salts, which are bound to increase costs and hinder the large‐scale applications of aqueous energy‐storage devices. [ 22–26 ] Therefore, to develop new low‐cost super‐concentrated aqueous electrolytes is imminent, not only for the perspective of practicality, but also for addressing new scientific issues with far‐reaching implications.…”

Section: Figurementioning

confidence: 99%

A Universal Approach to Aqueous Energy Storage via Ultralow‐Cost Electrolyte with Super‐Concentrated Sugar as Hydrogen‐Bond‐Regulated Solute

et al. 2020

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Compared with the organic, ionic liquid, and solid-state electrolytes, aqueous electrolytes have the advantages of good security, environmental friendliness, high ionic conductivity, low cost, and high operability in ordinary environments. [1][2][3][4][5] Therefore, aqueous secondary ion batteries/capacitors are more attractive in large-scale energy storage, and have greater application prospects. [6][7][8][9] However, even so, there still exists several disadvantages as follows: 1) The thermodynamic electrochemical stability window (ESW) of water is as narrow as 1.23 V. Even considering the existence of overpotential, the ESWs of conventional aqueous electrolytes are not higher than 2 V. 2) Usually, the electrode materials cannot form stable interface in water, so it is difficult to ensure the cycling stability. 3) Dissolution and even decomposition of electrode materials and discharge/charge products limit the choice of electrode materials. [10] These factors have limited the improvement of key electrochemical performance indicators such as energy density, output voltage, and cycle life of aqueous energy-storage devices Aqueous energy-storage systems have attracted wide attention due to their advantages such as high security, low cost, and environmental friendliness. However, the specific chemical properties of water induce the problems of narrow electrochemical stability window, low stability of water-electrode interface reactions, and dissolution of electrode materials and intermediate products. Therefore, new low-cost aqueous electrolytes with different water chemistry are required. The nature of water depends largely on its hydroxylbased hydrogen bonding structure. Therefore, the super-concentrated hydroxyl-rich sugar solutions are designed to change the original hydrogen bonding structure of water. The super-concentrated sugars can reduce the free water molecules and destroy the tetrahedral structure, thus lowering the binding degree of water molecules by breaking the hydrogen bonds. The ionic electrolytes based on super-concentrated sugars have the expanded electrochemical stability window (up to 2.812 V), wide temperature adaptability (-50 to 80 °C), and fair ionic conductivity (8.536 mS cm −1 ). Aqueous lithium-, sodium-, potassium-ion batteries and supercapacitors using super-concentrated sugar-based electrolytes demonstrate an excellent electrochemical performance. The advantages of ultralow cost and high universality enable a great practical application potential of the superconcentrated sugar-based aqueous electrolytes, which can also provide great experimental and theoretical assistance for further research in water chemistry.

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“…In the case of

, the low cost, good compatibility, and exceptional stability make it more attractive; however, some by-products produced by over cycling still limits its practical application (Zhao et al, 2016 ; Huang et al, 2019b ). Another anion is

, which has strong oxidability, lowering the potential for explosive risks and high toxicity (Lee et al, 2019 ). The bulky organic anions (i.e., CF 3

, FSI − , TFSI − , BETI − , and PTFSI − ) in aqueous electrolytes can reduce the solvation effect by occupying a large space.…”

Section: Wis Electrolytes For Non-lithium Armibsmentioning

confidence: 99%

“…Another well-used electrolyte in ASIBs is NaClO 4 solution. When its molality increases to 17 m, a stable electrochemical potential window of ~2.8 V can be realized (Nakamoto et al, 2017 , 2018 ; Lee et al, 2019 ). However, the potential explosive risk and high toxicity may hinder the extensive use of NaClO 4 .…”

Section: Wis Electrolytes For Non-lithium Armibsmentioning

confidence: 99%

Recent Progress in “Water-in-Salt” Electrolytes Toward Non-lithium Based Rechargeable Batteries

et al. 2020

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Aqueous non-lithium based rechargeable batteries are emerging as promising energy storage devices thanks to their attractive rate capacities, long-cycle life, high safety, low cost, environmental-friendliness, and easy assembly conditions. However, the aqueous electrolytes with high ionic conductivity are always restricted by their intrinsically narrow electrochemical window. Encouragingly, the highly concentrated "water-in-salt" (WIS) electrolytes can efficiently expand the stable operation window, which brings up a series of aqueous high-voltage rechargeable batteries. In the mini review, we summarize the latest progress and contributions of various aqueous electrolytes for non-lithium (Na + , K + , Zn 2+ , Mg 2+ , and Al 3+) based rechargeable batteries, and give a brief exploration of the operating mechanisms of WIS electrolytes in expanding electrochemically stable windows. Challenges and prospects are also proposed for WIS electrolytes toward aqueous non-lithium rechargeable metal ion batteries.

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Toward a low-cost high-voltage sodium aqueous rechargeable battery

Cited by 184 publications

References 65 publications

The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation

The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation

A Universal Approach to Aqueous Energy Storage via Ultralow‐Cost Electrolyte with Super‐Concentrated Sugar as Hydrogen‐Bond‐Regulated Solute

Recent Progress in “Water-in-Salt” Electrolytes Toward Non-lithium Based Rechargeable Batteries

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Toward a low-cost high-voltage sodium aqueous rechargeable battery

Cited by 184 publications

References 65 publications

The Sodium Storage Mechanism in Tunnel‐Type Na0.44MnO2 Cathodes and the Way to Ensure Their Durable Operation

The Sodium Storage Mechanism in Tunnel‐Type Na0.44MnO2 Cathodes and the Way to Ensure Their Durable Operation

A Universal Approach to Aqueous Energy Storage via Ultralow‐Cost Electrolyte with Super‐Concentrated Sugar as Hydrogen‐Bond‐Regulated Solute

Recent Progress in “Water-in-Salt” Electrolytes Toward Non-lithium Based Rechargeable Batteries

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The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation

The Sodium Storage Mechanism in Tunnel‐Type Na_0.44MnO₂ Cathodes and the Way to Ensure Their Durable Operation