Relationship between carbonaceous materials and electrolyte in secondary lithium-ion batteries

Ohta, Akira; Hizuru, Koshina; Hiromi, Okuno; Murai, H.

doi:10.1016/0378-7753(94)02031-w

Cited by 68 publications

(49 citation statements)

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“…Esters have been applied to improve the low temperature rate capability of Liion cells and also improve rate capability at room temperature. [3][4][5][6][7][8][9][10] Li-ion batteries with esters and positive electrodes of LiCoO 2 were studied in References 4-7 while those with LiNi x Co 1-x O 2 positive electrodes were studied by Smart et al lifetime with an electrolyte containing 2 wt% prop-1-ene-1,3 sultone (PES) + 1 wt% tris (trimethylsilyl) phosphite (TTSPi) + 1 wt % ethylene sulfate (DTD) in 1 M LiPF 6 in ethylene carbonate (EC): ethyl methyl carbonate (EMC) (3:7 by weight). More than 92% capacity was maintained after testing for one year between 3.0 and 4.4 V (∼1600 cycles with C/2 rate, CCCV) at 40…”

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confidence: 99%

Methyl Acetate as a Co-Solvent in NMC532/Graphite Cells

et al. 2018

J. Electrochem. Soc.

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One goal of researchers focusing on lithium-ion batteries for electric vehicles is to decrease the time required for charging. This can be done by several methods, including increasing the electrolyte transport properties. Methyl acetate, used as a co-solvent in the electrolyte, has been shown by a number of researchers to increase cell rate capability dramatically but careful considerations of the impact of methyl acetate on cell lifetime have not been published to our knowledge. The impacts of methyl acetate as a co-solvent in NMC532/ graphite cells were systematically studied in this work. Ex-situ gas evolution measurements, electrochemical impedance spectroscopy, high rate charging tests, ultra-high precision coulometry, isothermal microcalorimetry and long term cycling at both 20 and 40 • C were used to probe the impacts of including methyl acetate as a co-solvent. This work will be of great interest to Li-ion battery scientists developing cells that can support rapid charge and still maintain long lifetime. Lithium ion cells for electric vehicles should have long lifetime, high energy density and be able to support high rate charging. If cells are charged too rapidly for a given temperature, it is possible that unwanted lithium plating on the graphite negative electrode can occur and can accelerate cell capacity loss.1 There are a number of factors that influence the ability of cells to be charged rapidly. These include the thicknesses of the electrodes and the separator, the porosity and tortuosity of the electrodes and the separator and the electrolyte transport properties. In addition, Liu et al.,2 recently highlighted the importance of the negative electrode solid electrolyte interphase (SEI) resistance on the ability of cells to be charged rapidly without unwanted lithium plating during charge.For any given cell design, the easiest change to make in Liion cell manufacturing is a change in the electrolyte. All that entails, apart from possible materials compatibility issues, is filling cells with a different fluid. Electrolytes that promote high lithiumion diffusion constants, low viscosity, high conductivity, a high lithium ion transference number and promote low resistance negative electrode SEI layers are preferred for cells designed for high rate charging. Esters are beneficial co-solvents that lower freezing points, increase ionic conductivity and lower viscosity. Esters have been applied to improve the low temperature rate capability of Liion cells and also improve rate capability at room temperature. [3][4][5][6][7][8][9][10] Li-ion batteries with esters and positive electrodes of LiCoO 2 were studied in References 4-7 while those with LiNi x Co 1-x O 2 positive electrodes were studied by Smart et al. lifetime with an electrolyte containing 2 wt% prop-1-ene-1,3 sultone (PES) + 1 wt% tris (trimethylsilyl) phosphite (TTSPi) + 1 wt % ethylene sulfate (DTD) in 1 M LiPF 6 in ethylene carbonate (EC): ethyl methyl carbonate (EMC) (3:7 by weight). More than 92% capacity was maintained after testing for ...

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confidence: 99%

Methyl Acetate as a Co-Solvent in NMC532/Graphite Cells

et al. 2018

J. Electrochem. Soc.

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“…Ethylene carbonate (EC) based electrolytes are often a common choice. Unfortunately, EC does not work well at low temperatures as it solidifies and the conductivity drops to practically zero (2). Propylene carbonate (PC) based electrolytes on the other hand, can operate at much lower temperatures than EC.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy of a Porous Graphite Electrode Used for Li-Ion Batteries with EC/PC Based Electrolytes

et al. 2012

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Electrochemical impedance spectroscopy has been employed to investigate different electrolyte compositions used for lithium-ion batteries. Diffusion coefficients in ethylene carbonate (EC) was estimated to be in order of 10-7-10-11 cm2/s, depending on the state of charge (SOC), and propylene carbonate (PC) based electrolytes has been estimated to be in the order 10-10-10-11 cm2/s. Lithium bis(oxalato) borate (LiBOB) was used as an additive in the PC electrolytes to prevent exfoliation

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“…Upfront consideration was given to key Li-ion systems relevant to the experimental matrix of electrolyte formulations listed in EIC's mixture design of experiment, i.e., systems containing EC, PC, DMC, and FEC with LiPF 6 or other salts. Electrolytes based on EC/PC/DMC and LiPF 6 have been found to have problems with solid phase formation starting between -15 and -20 °C ( 2 ). Similar phase problems occur when using LiBOB, although the phase transition appears to happen at slightly lower temperatures and is formulation dependent ( 3 ).…”

Section: -Inl Work On Advanced Electrolyte Modelmentioning

confidence: 99%

“…We found that electrolytes formulations with fluorinatedcarbonate co-solvent have excellent film forming properties and better de-solvation characteristics to decrease the interfacial SEI film resistance and facilitate the Li-ion diffusion across the SEI film. For example, the interfacial resistances for Li/MCMB half cell in 1.2M LiPF 6 The very overwhelming low interfacial impedance for FEC electrolyte will translate into Li-ion cell with much higher power for cold cranking and high Regen charge at the low temperature. Further, since the SEI film resistance is low, Li interaction kinetics into the electrode will remain very fast and thus Li plating during Regen/charge period will less likely to happen.…”

Section: Phase I Summarymentioning

confidence: 99%

“…To determine the sensitivity of our measurements with different conductivity cells, we have used three different cells with different cell constants for measuring the conductivity of the baseline electrolyte 1.2M LiPF 6 in EMC:EC:PC:DMC (10:20:10:60). Conductivity measurements were performed within the temperature range of +20 to -40 o C. The results are reported in Table 1.…”

Section: -Evaluation Of New Electrolyte Formulationsmentioning

confidence: 99%

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