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Tobishima, Shin‐ichi; Ogino, Yuichi; Watanabe, Y.

doi:10.1023/a:1024039302020

Cited by 59 publications

(24 citation statements)

References 20 publications

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“…However, the following reaction at $4.55 V(vs. Li/Li + ) restricts its further application at higher potential. 13 In recent efforts, we found that the hexamethylene diisocyanate (HDI) exhibits an interesting lm-forming behavior. HDI is a commercially available product, and has been utilized in various elds such as the chemical industry, agriculture and medicine.…”

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confidence: 99%

Hexamethylene diisocyanate as an electrolyte additive for high-energy density lithium ion batteries

et al. 2015

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Hexamethylene diisocyanate can chemically react with the onium ion produced by the oxidation of propylene carbonate and in situ generate a novel interfacial layer that is stable at high potential. With an appropriate thickness of this film, LiNi 1/3 Co 1/3 Mn 1/3 O 2 presents significantly improved rate and cycle performances when tested between 2.5 and 4.6 V (vs. Li/Li + ).Lithium ion batteries (LIBs) have been rapidly developed since their rst commercialization in the 1990s by Sony. 1 To date, this technology has dominated the market of commercial electronic devices and penetrated into the elds of transportation and smart grids. 2 In contrast to aqueous systems, 3 LIB electrolytes utilize liquid carbonates as solvents, which enable their operating window to be widened to 1.2-4.3 V(vs. Li/Li + ). 4 Although the anodic working potential was pushed to $0.02 V(vs. Li/Li + ) by building a solid electrolyte interphase (SEI) layer, 5 the progress to li cathode limitation almost remained static for most of the solid remnants started to decompose above 4.35 V(vs. Li/ Li + ). 4 On the other hand, positively widening the working window could provide the possibility to fully utilize the commercial cathodes such as LiCoO 2 and LiNi 1ÀxÀy Co x Mn y O 2 , and enable the evaluation of novel materials including xLi 2 -MnO 3 $(1 À x)LiMnO 2 and LiNi 0.5 Mn 1.5 O 4 . 6 Obviously, using high-potential electrolytes has become one of the most promising strategies to enhance the cell's energy density.The utilization of anti-oxidative solvents seems to be the most easily implemented solution. The solvents with strong electron-withdrawing groups, such as sulfone and nitrile, 7 could endure the oxidation at high potential. Although they exhibited good stability even up to 6 V(vs. Li/Li + ), the electrolytes based on these solvents are not applicable in current commercial systems due to their inability to construct an effective SEI layer on the graphite anode. 8 Currently, these solvents are utilized as cosolvents, by which the cut-off potential could be lied by 100-200 mV. This improvement could be attributed to the absorption of anti-oxidative solvents on the active sites of cathodes. 7b,9Passivating the cathode with an inert layer is an alternative strategy to improve its cyclic stability. Coating inorganic ceramics, such as metal oxides and phosphates, could alleviate the side reactions between the electrolyte solvents and cathodes to make LiCoO 2 work normally at 4.4 V(vs. Li/Li + ) in state-of-theart electrolytes. 10 Building an organic lm with lower HOMO levels is also a feasible strategy, such as the uorinated decomposed products of phosphides. The uorine-containing fragments and subsequently generated oligomers present a better stability at high potential, as shown by Choi and Xu et al. 11 Using a polymer layer is another effective way to ameliorate the cyclic stability. With the appropriate concentration, aromatic derivatives 12 could form a thin layer on the cathode, instead of dimensional growth that will lead to ele...

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confidence: 99%

Hexamethylene diisocyanate as an electrolyte additive for high-energy density lithium ion batteries

et al. 2015

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“…[22][23][24] Ionic liquids (ILs) are molten salts having a melting point below 100 • C and consist of organic cations and organic or inorganic anions. 25 With high conductivity, very low flammability and good thermal and high oxidations stability, ILs are considered as an alternative for organic solvent based electrolytes.…”

Section: A Brief Introduction On Non-aqueous and Ionic Liquid Based Ementioning

confidence: 99%

Review—Chemical Analysis for a Better Understanding of Aging and Degradation Mechanisms of Non-Aqueous Electrolytes for Lithium Ion Batteries: Method Development, Application and Lessons Learned

Nowak

Winter

2015

J. Electrochem. Soc.

144

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Non-aqueous organic solvent based electrolytes solutions are state of the art components in lithium ion batteries. Numerous investigations have led to the structural, qualitative and quantitative information of the electrolyte degradation products and eventually resulted in the proposal of mechanisms for the related electrolyte aging reactions. To obtain more detailed and also more quantitative knowledge about the fundamental degradation processes, and to identify numerous degradation products and their structures, novel analytical techniques for chemical analysis were developed and systematic research of the decomposition products was performed by applying these new methods. In this mini-review, we introduce these techniques and how they can be applied for the chemical analysis of non-aqueous organic solvent and ionic liquid based electrolytes to gain a deeper knowledge of aging and degradation of electrolytes for lithium and lithium ion batteries.

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“…[2][3][4][5][6][7][8][9][10] In a previous report, we introduced an electrochemical impedance spectroscopic (EIS) measurement as a screening tool for the performance of additives before real abuse tests in lithium-ion cells. We had evaluated effects of varied compositions of BP and CHB by potentiodynamic, electrochemical quartz crystal microbalance (EQCM), spectroelectrochemical, and EIS measurements.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry of Conductive Polymers 46. Polymer Films as Overcharge Inhibitors for Lithium-Ion Rechargeable Batteries

Choi¹,

Park

2010

Journal of Electrochemical Science and Technology

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:Conducting polymer films grown from various aromatic compounds have been evaluated as overcharge protecting additives for lithium ion rechargeable batteries. The polymer films were grown electrochemically under the conditions similar to those encountered during the overcharging processes of lithium batteries and subsequently characterized by potentiodynamic, electrochemical quartz crystal microbalance, electrochemical impedance spectroscopic, and scanning electron microscopic experiments. Results indicate that bicyclic and polycyclic aromatic hydrocarbons would be poor candidates for inhibitors, while biphenyl, terphenyl, and benzene derivatives displayed excellent performances. Mixed polymer films grown from o-terphenyl and p-xylene show the best performance among the candidates.

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Untitled

Cited by 59 publications

References 20 publications

Hexamethylene diisocyanate as an electrolyte additive for high-energy density lithium ion batteries

Hexamethylene diisocyanate as an electrolyte additive for high-energy density lithium ion batteries

Review—Chemical Analysis for a Better Understanding of Aging and Degradation Mechanisms of Non-Aqueous Electrolytes for Lithium Ion Batteries: Method Development, Application and Lessons Learned

Electrochemistry of Conductive Polymers 46. Polymer Films as Overcharge Inhibitors for Lithium-Ion Rechargeable Batteries

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