Fluorinated Hyperbranched Cyclotriphosphazene Simultaneously Enhances the Safety and Electrochemical Performance of High‐Voltage Lithium‐Ion Batteries

Kim, Choon-Ki; Shin, Dong-Seon; Kim, Koeun; Shin, Kyomin; Woo, Jung‐Je; Kim, Saheum; Hong, Sung You; Choi, Nam‐Soon

doi:10.1002/celc.201600025

Cited by 49 publications

(41 citation statements)

References 46 publications

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“…Kim et al developed anovel flame-retardant additive with afluorinated hyperbranched cyclotriphosphazene structure for 5V highvoltage LIBs. [146] Asimilar functional electrolyte cosolvent of tris(2,2,2-trifluoroethyl)phosphate (TFEP) was also developed. [141] This kind of electrolyte additive enhanced the electrochemical properties by generating thermally and electrochemically stable SEI layers on both the cathode and the anode.…”

Section: Electrolyte Design and Additivesmentioning

confidence: 99%

Halide‐Based Materials and Chemistry for Rechargeable Batteries

et al. 2020

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Rechargeable batteries are considered one of the most effective energy storage technologies to bridge the production and consumption of renewable energy. The further development of rechargeable batteries with characteristics such as high energy density, low cost, safety, and a long cycle life is required to meet the ever‐increasing energy‐storage demands. This Review highlights the progress achieved with halide‐based materials in rechargeable batteries, including the use of halide electrodes, bulk and/or surface halogen‐doping of electrodes, electrolyte design, and additives that enable fast ion shuttling and stable electrode/electrolyte interfaces, as well as realization of new battery chemistry. Battery chemistry based on monovalent cation, multivalent cation, anion, and dual‐ion transfer is covered. This Review aims to promote the understanding of halide‐based materials to stimulate further research and development in the area of high‐performance rechargeable batteries. It also offers a perspective on the exploration of new materials and systems for electrochemical energy storage.

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Section: Electrolyte Design and Additivesmentioning

confidence: 99%

Halide‐Based Materials and Chemistry for Rechargeable Batteries

et al. 2020

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“…[ 10 ] Furthermore, N with a filled orbital can form a coordination complex with the strong Lewis acid PF 5 , which is an intermediate that promotes the hydrolysis of LiPF 6 to produce acidic compounds, and it can scavenge the proton of acidic compounds (HF, HPO 2 F 2 , and H 2 PO 3 F). [ 11 ] In this regard, the combination of TMS and N‐containing groups is regarded as a very effective molecular design for improving the stability of LiPF 6 ‐based electrolytes in LIBs. Although aminosilanes (N–Si) are suitable for scavenging both HF and H 2 O, [ 12 ] the underlying mechanisms of these processes are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Aminosilane‐Based Additive Ensuring Stable Electrode–Electrolyte Interfaces in Li‐Ion Batteries

Kim

Hwang

Kim

et al. 2020

Advanced Energy Materials

121

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Ni‐rich cathodes are considered feasible candidates for high‐energy‐density Li‐ion batteries (LIBs). However, the structural degradation of Ni‐rich cathodes on the micro‐ and nanoscale leads to severe capacity fading, thereby impeding their practical use in LIBs. Here, it is reported that 3‐(trimethylsilyl)‐2‐oxazolidinone (TMS‐ON) as a multifunctional additive promotes the dissociation of LiPF6, prevents the hydrolysis of ion‐paired LiPF6 (which produces undesired acidic compounds including HF), and scavenges HF in the electrolyte. Further, the presence of 0.5 wt% TMS‐ON helps maintain a stable solid–electrolyte interphase (SEI) at Ni‐rich LiNi0.7Co0.15Mn0.15O2 (NCM) cathodes, thus mitigating the irreversible phase transformation from layered to rock‐salt structures and enabling the long‐term stability of the SEI at the graphite anode with low interfacial resistance. Notably, NCM/graphite full cells with TMS‐ON, which exhibit an excellent discharge capacity retention of 80.4%, deliver a discharge capacity of 154.7 mAh g−1 after 400 cycles at 45 °C.

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“…In this work, fluorinated phosphazene derivative is proposed for high voltage lithium ion batteries as a novel type of additive. We have reported a new additive, ethoxy-(pentafluoro)-cyclotriphosphazene (N 3 P 3 F 5 OCH 2 CH 3 , PFN), which combines the structure of the nonflammable cyclophosphazene with fluorine to create a highly synergistic flame retardant effect and good electrochemical compatibility [32][33][34][35]. We found that a low content of PFN could extinguish burning electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Fluorinated phosphazene derivative – A promising electrolyte additive for high voltage lithium ion batteries: From electrochemical performance to corrosion mechanism

et al. 2018

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The development of novel electrolytes for next-generation high voltage lithium ion battery is of primary importance. In this work, a fluorinated phosphazene derivative, ethoxy-(pentafluoro)-cyclotriphosphazene (PFN), is proposed as a novel electrolyte additive for improving the electrochemical performance and safety of lithium nickel manganese oxide (LiNi 0.5 Mn 1.5 O 4) cathode. With the addition of PFN, the electrolyte can be preferentially oxidized and decomposed, thus producing some linear polymers, multi-ring polymers, LiNO 3 , RONO 2 Li (RONO 2 : nitrate ester functional group, with R standing for any organic residue), Li 3 PO 4 , and ROPO 3 Li (ROPO 3 : monoester phosphate) simultaneously. These as-generated materials form a dense, uniform, and thin protective layer on the surface of the cathode material, which suppresses the decomposition of electrolyte and electrode corrosion, correspondingly protecting the LiNi 0.5 Mn 1.5 O 4 from structural destruction. Due to the coverage by the protective film and corrosion suppression, charge and discharge tests demonstrate that PFN is effective for improving the cycling stability of LiNi 0.5 Mn 1.5 O 4. The discharge capacity of a battery with 5 wt% PFN is 124.4 mAh g −1 and 99.8 mAh g −1 after 100 cycles at the current rates of 0.2 C and 1 C, respectively, which is much better than the performance without PFN. Meanwhile, because of the combined structure of the nonflammable cyclophosphazene and fluorine, the PFN creates a highly synergistic flame retardant effect, and a low content of PFN can almost completely extinguish burning electrolyte, leading to excellent safety performance for the lithium ion battery.

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Fluorinated Hyperbranched Cyclotriphosphazene Simultaneously Enhances the Safety and Electrochemical Performance of High‐Voltage Lithium‐Ion Batteries

Cited by 49 publications

References 46 publications

Halide‐Based Materials and Chemistry for Rechargeable Batteries

Halide‐Based Materials and Chemistry for Rechargeable Batteries

Cyclic Aminosilane‐Based Additive Ensuring Stable Electrode–Electrolyte Interfaces in Li‐Ion Batteries

Fluorinated phosphazene derivative – A promising electrolyte additive for high voltage lithium ion batteries: From electrochemical performance to corrosion mechanism

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