Synergy of binders and electrolytes in enabling microsized alloy anodes for high performance potassium-ion batteries

Wu, Jin-Hui; Zhang, Qing; Liu, Sailin; Long, Jun; Wu, Zhibin; Zhang, Wenchao; Pang, Wei; Sencadas, Vítor; Song, Rui; Song, Wenlong; Mao, Jianfeng; Guo, Zaiping

doi:10.1016/j.nanoen.2020.105118

Cited by 91 publications

(82 citation statements)

References 51 publications

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“…[ 9,10 ] In the case of the salt for PIBs, the most attractive one is potassium bis(fluorosulfonyl)imide (KFSI), as it could lead to a more stable SEI than is possible with other salts, such as KPF 6 and potassium bis(trifluoromethanesulfonyl)imide. [ 11–14 ] Also, it has been demonstrated that the stability of graphite can be enhanced by simply increasing the salt concentration in conventional carbonate or ether‐based electrolytes. An electrolyte consisting of KFSI and ethyl methyl carbonate (EMC) at the high molar ratio of 1:2.5 made the graphite anode work for 17 months.…”

Section: Figurementioning

confidence: 99%

Manipulating the Solvation Structure of Nonflammable Electrolyte and Interface to Enable Unprecedented Stability of Graphite Anodes beyond 2 Years for Safe Potassium‐Ion Batteries

et al. 2020

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redox potential of K + is close to that of Li + but lower than for Na +. [1-4] Another important motivation for PIB research is that K + cations can be reversibly intercalated into the commercial graphite anode used for LIBs with a high theoretical capacity of 279 mAh g −1 based, on the generated compound KC 8 , which offers the encouraging prospect of PIBs suitable for high manufacturability, by using the commercial production lines for LIBs. [5-7] For the large-scale applications of PIBs, long-term calendar life and high safety are the most two critical factors. The graphite anode in PIBs, however, suffers from poor stability due to the continual decomposition of the electrolyte and insufficient solid electrolyte interphase (SEI) protection. [8] The electrolyte plays a vital role in determining the performance of electrode materials and regulating the SEI to eliminate interfacial side reactions and ensure long-term cyclability and high safety. Tremendous efforts have been made to regulate electrolytes by altering the salts, solvents, additives, and/ or concentrations. [9,10] In the case of the salt for PIBs, the most attractive one is potassium bis(fluorosulfonyl)imide (KFSI), as it could lead to a more stable SEI than is possible with other salts, such as KPF 6 and potassium bis(trifluoromethanesulfonyl) imide. [11-14] Also, it has been demonstrated that the stability of graphite can be enhanced by simply increasing the salt concentration in conventional carbonate or ether-based electrolytes. An electrolyte consisting of KFSI and ethyl methyl carbonate (EMC) at the high molar ratio of 1:2.5 made the graphite anode work for 17 months. Benefiting from the robust inorganic-rich SEI layer generated by the concentrated KFSI with EMC, this long cycle-life performance of graphite is the best that has ever been achieved in reported electrolytes. [15] The carbonate or ether-based electrolytes are highly combustible and volatile, however, which poses a great potential hazard for accidents involving explosion and fire. Although the volatility and flammability can be reduced in highly concentrated electrolytes, safety still remains an issue, especially for large-scale implementation. [16,17] It is well known that the flammability of the electrolyte is mainly determined by the property of solvents, and thus, there are also efforts toward developing nonflammable electrolytes Potassium-ion batteries (PIBs) are attractive for low-cost and large-scale energy storage applications, in which graphite is one of the most promising anodes. However, the large size and the high activity of K + ions and the highly catalytic surface of graphite largely prevent the development of safe and compatible electrolytes. Here, a nonflammable, moderate-concentration electrolyte is reported that is highly compatible with graphite anodes and that consists of fire-retardant trimethyl phosphate (TMP) and potassium bis(fluorosulfonyl)imide (KFSI) in a salt/solvent molar ratio of 3:8. It shows unprecedented stability, as evidenced by its 74% capacity r...

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Section: Figurementioning

confidence: 99%

Manipulating the Solvation Structure of Nonflammable Electrolyte and Interface to Enable Unprecedented Stability of Graphite Anodes beyond 2 Years for Safe Potassium‐Ion Batteries

et al. 2020

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“…[ 1–5 ] Similar to lithium‐ion batteries, SIBs and PIBs share a similar “rocking‐chair” mechanism, but their practical applications are impeded by the difficulty of developing suitable anode materials that are capable of reversibly accommodating the greatly large Na + and K + ions. [ 6–8 ] Recent efforts in the exploration of potential anode materials have made sound progress, however. Several kinds of materials, including carbon‐based materials, alloy‐type materials, organic materials, oxides, phosphides, sulfides, etc., have showed promising properties for sodium and potassium storage, although this progress is still not sufficient for practical application.…”

Section: Introductionmentioning

confidence: 99%

Phase Engineering of Nickel Sulfides to Boost Sodium‐ and Potassium‐Ion Storage Performance

Liu

Rehman

et al. 2021

Adv Funct Materials

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Sulfides are promising anode candidates because of their relatively large theoretical discharge/charge specific capacity and pretty small volume changes, but suffers from sluggish kinetics and structural instability upon cycling. Phase engineering can be designed to overcome the weakness of the electrochemical performance of sulfide anodes. By choosing nickel sulfides (α‐NiS, β‐NiS, and NiS2) supported by reduced graphene oxide (rGO) as model systems, it is demonstrated that the nickel sulfides with different crystal structures show different performances in both sodium‐ion and potassium‐ion batteries. In particular, the α‐NiS/rGO display superior stable capacity (≈426 mAh g−1 for 500 cycles at 500 mA g−1) and exceptional rate capability (315 mAh g−1 at 2000 mA g−1). The combined density functional theory calculations and experimental studies reveal that the hexagonal structure is more conducive to ion absorption and conduction, a higher pseudocapacitive contribution, and higher mechanical ability to relieve the stress caused by the volume changes. Correspondingly, the phase engineered nickel sulfide coupled with the conducting rGO network synergistically boosts the electrochemical performance of batteries. This work sheds light on the use of phase engineering as an essential strategy for exploring materials with satisfactory electrochemical performance for sodium‐ion and potassium‐ion batteries.

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“…24d ). 71 It indicated the successful formation of stable SEI layers and the suppression of electrolyte decomposition. Although there is already remarkable improvement in the cycling integrity and stability of KIB, the capacity decay as a result of component incompatibility was not thoroughly mitigated, and the degeneration of electrode structure is still needed to be further addressed.…”

Section: Current Main Challengesmentioning

confidence: 97%

State-of-the-art anodes of potassium-ion batteries: synthesis, chemistry, and applications

Kim

et al. 2021

Chem. Sci.

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Synergy of binders and electrolytes in enabling microsized alloy anodes for high performance potassium-ion batteries

Cited by 91 publications

References 51 publications

Manipulating the Solvation Structure of Nonflammable Electrolyte and Interface to Enable Unprecedented Stability of Graphite Anodes beyond 2 Years for Safe Potassium‐Ion Batteries

Manipulating the Solvation Structure of Nonflammable Electrolyte and Interface to Enable Unprecedented Stability of Graphite Anodes beyond 2 Years for Safe Potassium‐Ion Batteries

Phase Engineering of Nickel Sulfides to Boost Sodium‐ and Potassium‐Ion Storage Performance

State-of-the-art anodes of potassium-ion batteries: synthesis, chemistry, and applications

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