High performance of low-temperature electrolyte for lithium-ion batteries using mixed additives

Lv, Weixia; Zhu, Cheng; Ou, Caixia; Zhang, Qian; Zhong, Shengwen

doi:10.1016/j.cej.2021.129400

Cited by 62 publications

(28 citation statements)

References 48 publications

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“…It is clear that TMBDSA additive can not only effectively suppress the phase transformation of NCM811, but also improve the electrochemical reversibility of the baseline electrolyte. [15] As for Li/graphite half cells, the similar CV curves are observed for the electrolyte with TMBDSA additive, indicating that the electrolyte with TMBDSA reduces polarization and shows better compatibility with the graphite anode (Figure 1e-f).…”

Section: Resultssupporting

confidence: 58%

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

2022

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A new disiloxane compound with tertiary amine and dioxaborolane group, N,N‐dimethyl‐2‐(3‐(1,1,3,3‐tetramethyl‐3‐(3‐(2‐(4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolan‐2‐yl)ethoxy)propyl)disiloxanyl)propoxy)ethan‐1‐amine (TMBDSA), is designed and synthesized as functional electrolyte additive for improving the cycling stability of high‐capacity nickel‐rich LiNi0.8Co0.1Mn0.1O2 (NCM811). The NCM811/graphite full cell test shows that the cycling stability is considerably improved by adding TMBDSA (0.2 wt.%) in the baseline electrolyte, retaining 88 % of initial capacity as compared with 71 % for the cell with the baseline electrolyte at 1 C after 200 cycles. Even at a high rate of 10 C, the cell with TMBDSA delivers a high capacity of 140.2 mAh/g and outstanding cycling stability at high temperatures of 55 °C. The surface analysis and density functional theory calculation reveal that TMBDSA is oxidized prior to the carbonate components in the electrolyte to form a protective interphase layer on the cathode surface. In addition, TMBDSA can significantly suppress the hydrolysis of LiPF6 and the dissolution of transition metal ions (Ni, Co, and Mn) owing to the acid scavenging function of tertiary amine moiety. All the results demonstrate that TMBDSA can be potentially used as an efficient electrolyte additive for improving the cycling life of high energy density lithium‐ion batteries using nickel‐rich NCM811 cathode.

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Section: Resultssupporting

confidence: 58%

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

2022

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“…Specially, a shoulder peak at 532.5 eV is clearly found in the TFPB-containing electrolyte, which could be assigned to the presence of B–O, resulting from the decomposition of TFPB . As for F 1s spectra (Figure c and f), two peaks located at 685 and 687.6 eV belong to the presence of LiF and C–F/Li x PO y F z . The relatively lower LiF peak intensity found in the electrolyte with TFPB indicates that the borate-containing CEI is more protective to inhibit the direct contact between the LCO electrode and the electrolyte, reducing the electrolyte corrosion to LCO.…”

Section: Resultsmentioning

confidence: 91%

“…43 As for F 1s spectra (Figure 8c and f), two peaks located at 685 and 687.6 eV belong to the presence of LiF and C−F/Li x PO y F z . 44 The relatively lower LiF peak intensity found in the electrolyte with TFPB indicates that the borate-containing CEI is more protective to inhibit the direct contact between the LCO electrode and the electrolyte, reducing the electrolyte corrosion to LCO. In addition, the reduced formation of LiF also implies that C−F bonds in the TFPB additive may not break down to generate LiF byproduct.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Stabilizing the LiCoO₂ Interface at High Voltage with an Electrolyte Additive 2,4,6-Tris(4-fluorophenyl)boroxin

Zou

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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To achieve higher energy density, LiCoO2 (LCO) is being developed for high-voltage operation at raised charge cutoff voltages up to 4.6 V vs Li/Li+, which however is beyond the electrochemical stability window of carbonate-based electrolytes. In this work, a novel electrolyte additive 2,4,6-tris(4-fluorophenyl)boroxin (TFPB) is proposed for enhancing the interfacial stability of LCO. Thanks to the TFPB additive, the LCO cathode exhibits substantially improved capacity retention of 84.6% after 200 cycles at 1C at a high charge cutoff of 4.6 V, surpassing the 63.2% attained in the baseline electrolyte. The improved performance could be rationalized by the fact that TFPB additive is preferentially oxidized to build a uniform and protective B–O bond-containing cathode–electrolyte interphase, contributing to the reduced parasitic side reactions, inhibited surface structural transformation, and better-maintained interfacial lithium-ion diffusion kinetics.

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“…Among several components of LIBs, their electrolyte is very important because it has an evident effect on the redox reaction mechanism of cells. The standard electrolyte system 1 M LiPF 6 + ethylene carbonate (EC)/diethyl carbonate (DEC) is currently commercially available, but the most significant issue is that its application temperature range is extremely limited. − At low temperatures the electrolyte experiences a number of issues, including increased viscosity, decreased conductivity, increased cathode–electrolyte interface (CEI) film impedance, and reduced lithium-ion migration rate, especially, finally making a fast decline and even breakdown of the LIB’s performance. − Many studies have been undertaken with the goal of improving the battery’s low-temperature performance in recent years. − For instance, Smart et al demonstrated excellent low-temperature performances by comparing methylbutyrate (MB) and ethyl butyrate (EB) electrolyte additives, and excellent low-temperature performances were obtained at −60 °C with C/20 . The discharge capacity retention at current density is more than 80% of that at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Lithium Difluorophosphate (LiPO₂F₂): An Electrolyte Additive to Help Boost Low-Temperature Behaviors for Lithium-Ion Batteries

Chen

et al. 2022

ACS Appl. Energy Mater.

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A promising lithium salt of Li difluorophosphate (LiPO2F2) is introduced and added to the basic electrolyte (1 M LiPF6 + dimethyl carbonate (DMC)/ethyl methyl carbonate (EMC)/propylene carbonate (PC)/fluoroethylene carbonate (FEC)) to enhance the electrochemical performance of lithium-ion batteries by changing its concentration at low temperatures. Experiments show that LiPO2F2 can obviously improve the electrolyte’s ionic conductivity, especially. Compared with the baseline (6.29, 5.14, 4.62, 3.77, and 3.15 mS cm–1) under the same conditions, the ionic conductivities of the 2 wt % LiPO2F2-containing electrolyte (2 LiPO2F2) are 7.18, 5.32, 5.23, 4.04, and 3.57 mS cm–1. From this, it is clear that the integrated low-temperature electrochemical performances have been significantly improved. The specific discharge capacities of the 2 wt % LiPO2F2-added electrolyte at 0.2C are 161.4, 157.2, 148.9, and 137.5 mAh g–1 in the range from 25 to −40 °C, which are significantly much higher compared with the basic electrolyte (145.3, 149.4, 135.1, and 107.0 mAh g–1, respectively). Additionally, the addition of LiPO2F2 can promote profoundly the composition and morphology characteristics of the cathode–electrolyte interface (CEI) film; namely, it is a uneven lithium alkyl carboxylate before the addition of LiPO2F2; after that, it becomes an even LiF film, and meanwhile, the new film will facilitate Li+ transport in the electrolyte, further boosting the eletrochemical performance of the cells under low temperatures. At −40 °C under the same current density, the specific discharge capacity is 81.97 mAh g–1 after 50 cycles, while at the same temperature, the specific discharge capacity of the basic electrolyte battery is only 33.37 mAh g–1; that is, the discharge capacity has a staggering 145.6% improvement at −40 °C. In conclusion, the lithium-ion batteries containing LiPO2F2 may meet the application requirements of ultra-low-temperature conditions.

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High performance of low-temperature electrolyte for lithium-ion batteries using mixed additives

Cited by 62 publications

References 48 publications

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

Stabilizing the LiCoO₂ Interface at High Voltage with an Electrolyte Additive 2,4,6-Tris(4-fluorophenyl)boroxin

Lithium Difluorophosphate (LiPO₂F₂): An Electrolyte Additive to Help Boost Low-Temperature Behaviors for Lithium-Ion Batteries

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High performance of low-temperature electrolyte for lithium-ion batteries using mixed additives

Cited by 62 publications

References 48 publications

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi0.8Co0.1Mn0.1O2/Graphite Batteries

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi0.8Co0.1Mn0.1O2/Graphite Batteries

Stabilizing the LiCoO2 Interface at High Voltage with an Electrolyte Additive 2,4,6-Tris(4-fluorophenyl)boroxin

Lithium Difluorophosphate (LiPO2F2): An Electrolyte Additive to Help Boost Low-Temperature Behaviors for Lithium-Ion Batteries

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Product

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About

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

Disiloxanes Containing Tertiary Amine and Dioxaborolane Groups as Bifunctional Electrolyte Additive for Improved Cycling Life of LiNi_0.8Co_0.1Mn_0.1O₂/Graphite Batteries

Stabilizing the LiCoO₂ Interface at High Voltage with an Electrolyte Additive 2,4,6-Tris(4-fluorophenyl)boroxin

Lithium Difluorophosphate (LiPO₂F₂): An Electrolyte Additive to Help Boost Low-Temperature Behaviors for Lithium-Ion Batteries