Solid electrolyte interphase (SEI) in potassium ion batteries

Wang, Huwei; Zhai, Dengyun; Kang, Feiyu

doi:10.1039/d0ee01638a

Cited by 229 publications

(191 citation statements)

References 135 publications

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“…Since the decomposition of the electrolyte will participate in the formation process of SEI, the electrolyte plays a key role in the stability of the anode material. Potassium bis‐(fluorosulfonyl)imide (KFSI) has been extensively studied because it has a positive effect on the uniformity, stability and chemical composition of SEI [53b,56,70] . The HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy levels can be used to understand the thermodynamic stability of the solvents and potassium salts (Figure 6a) [56] .…”

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

“…The graphite anode remains highly reversible specific capacity, and even the ICE is 82.3 %. Another commonly used potassium salt for anodes, potassium hexafluorophosphate (KPF 6 ), has a high decomposition voltage in a low‐concentration ester electrolyte, but KPF 6 ‐based electrolyte is reduced by solvent‐induced reduction to form an unstable organic‐dominant SEI [61,70] . Wang et al.…”

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

“…The stability of the solvent plays a decisive role in the composition of the SEI [34,63,70] . Our group used 0.5 M KPF 6 carbonate/diethyl carbonate (EC/DEC) and diethylene glycol dimethyl ether (DEGDME) electrolytes to study the effect of SEI on capacity decay [21] .…”

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

“…Therefore, FEC may be not suitable to boost the performance of carbon‐based anodes for KIBs. In addition, to avoid the side reaction in K metal and explore the mechanism effect of FEC in carbon‐based anode, it is necessary to test in full cell [70] …”

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

“…The composition of electrolytes determines the stability of solid electrolyte interface, thus affecting the cycle stability and Coulomb efficiency of anodes [21] . Therefore, in order to achieve a breakthrough in properties for KIBs, considerable efforts in electrolyte and additive have been engaged to build robust solid electrolyte interface (SEI) [70] …”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Stability of Carbon‐Based Anodes for Potassium‐Ion Batteries

Wang

Zang

et al. 2020

Batteries & Supercaps

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The commercialization of potassium‐ion batteries requires promising anodes with excellent reversible capacity and cycle stability. Graphite anodes have attracted extensive research owing to the formation of stable intercalation compounds, which also helps to focus attention on low‐cost carbon‐based anodes. However, the slow diffusion of potassium ion (K+) and structural damage of graphite caused by large size may lead to capacity decay. Herein, the modification strategies have been summarized, including microstructure regulation, heteroatom doping and building stable solid electrolyte interphase. And the opportunities and challenges faced by these improvement methods are proposed. Meanwhile, carbon‐based materials used as hosts or conductive carriers to improve the performance of other anodes are also summarized.

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Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

Section: Modification Strategies Of Carbon‐based Anodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Recent Advances in Stability of Carbon‐Based Anodes for Potassium‐Ion Batteries

Wang

Zang

et al. 2020

Batteries & Supercaps

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Phosphorus and Oxygen Dual‐Doped Porous Carbon Spheres with Enhanced Reaction Kinetics as Anode Materials for High‐Performance Potassium‐Ion Hybrid Capacitors

Zhao

Yan

Liang

et al. 2021

Adv Funct Materials

114

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Hard carbons with low cost and high specific capacity hold great potential as anode materials for potassium‐based energy storage. However, their sluggish reaction kinetics and inevitable volume expansion degrade their electrochemical performance. Through rational nanostructure design and a heteroatom doping strategy, herein, the synthesis of phosphorus/oxygen dual‐doped porous carbon spheres is reported, which possess expanded interlayer distances, abundant redox active sites, and oxygen‐rich defects. The as‐developed battery‐type anode material shows high discharge capacity (401 mAh g−1 at 0.1 A g−1), outstanding rate capability, and ultralong cycling stability (89.8% after 10 000 cycles). In situ Raman spectroscopy and density functional theory calculations further confirm that the formation of PC and PO/POH bonds not only improves structural stability, but also contributes to a rapid surface‐controlled potassium adsorption process. As a proof of concept, a potassium‐ion hybrid capacitor is assembled by a dual‐doped porous carbon sphere anode and an activated carbon cathode. It shows superior electrochemical performance, which opens a new avenue to innovative potassium‐based energy storage technology.

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Building Elastic Solid Electrolyte Interphases for Stabilizing Microsized Antimony Anodes in Potassium Ion Batteries

Gao

Zhang

2021

Adv Funct Materials

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Alloy anodes composed of microsized particles receive increasing attention recently, which outperform the nanostructured counterparts in both the manufacturing cost and volumetric energy density. However, the pulverization of particles and fracture of solid electrolyte interphase (SEI) during cycling brings about fast capacity degradation. Herein, it is shown how normally considered fragile SEI can become highly elastic through electrolyte chemistry regulation. Compared to the SEI constructed in classic carbonate electrolyte, the atomic force microscopy tests reveal that the one built in ether‐based electrolyte doubles the maximum elastic strain to accommodate the repeated swelling‐contracting. Such an SEI effectively encapsulates the microsized Sb anodes to prevent the capacity loss from particle isolation. Coupled with an intercalation‐assisted alloying reaction mechanism, a sustained capacity of ≈573 mAh g−1 after 180 cycles at 0.1 A g−1 with outstanding initial Coulombic efficiency is obtained, which is among the highest values achieved in K‐ion batteries. This study emphasizes the significance of building robust SEI, which offers the opportunity to enable stable microsized alloy anodes.

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Solid electrolyte interphase (SEI) in potassium ion batteries

Abstract: Potassium-ion batteries (PIBs) have attracted considerable interest as large-scale energy storage candidates owing to a naturally abundant potassium resource and low cost. Since the birth of PIBs, the solid electrolyte...

Cited by 229 publications

References 135 publications

Recent Advances in Stability of Carbon‐Based Anodes for Potassium‐Ion Batteries

Recent Advances in Stability of Carbon‐Based Anodes for Potassium‐Ion Batteries

Phosphorus and Oxygen Dual‐Doped Porous Carbon Spheres with Enhanced Reaction Kinetics as Anode Materials for High‐Performance Potassium‐Ion Hybrid Capacitors

Building Elastic Solid Electrolyte Interphases for Stabilizing Microsized Antimony Anodes in Potassium Ion Batteries

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