Adiponitrile (C6H8N2)

A New Bi-Functional Additive for High-Performance Li-Metal Batteries

Seon Hwa Lee, Jang-Yeon Hwang, Seong Jin Park, Geon Tae Park, Yang-Kook Sun

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Rechargeable batteries with a Li metal anode and Ni-rich Li[NixCoyMn1−xy]O2 cathode (Li/Ni-rich NCM battery) have been emerging as promising energy storage devices because of their high-energy density. However, Li/Ni-rich NCM batteries have been plagued by the issue of the thermodynamic instability of the Li metal anode and aggressive surface chemistry of the Ni-rich cathode against electrolyte solution. In this study, a bi-functional additive, adiponitrile (C6H8N2), is proposed which can effectively stabilize both the Li metal anode and Ni-rich NCM cathode interfaces. In the Li/Ni-rich NCM battery, the addition of 1 wt% adiponitrile in 0.8 m LiTFSI + 0.2 M LiDFOB + 0.05 M LiPF6 dissolved in EMC/FEC = 3:1 electrolyte helps to produce a conductive and robust Li anode/electrolyte interface, while strong coordination between Ni4+ on the delithiated Ni-rich cathode and nitrile group in adiponitrile reduces parasitic reactions between the electrolyte and Ni-rich cathode surface. Therefore, upon using 1 wt% adiponitrile, the Li/full concentration gradient Li[Ni0.73Co0.10Mn0.15Al0.02]O2 battery achieves an unprecedented cycle retention of 75% over 830 cycles under high-capacity loading of 1.8 mAh cm−2 and fast charge–discharge time of 2 h. This work marks an important step in the development of high-performance Li/Ni-rich NCM batteries with efficient electrolyte additives.

Original languageEnglish
Article number1902496
JournalAdvanced Functional Materials
Volume29
Issue number30
DOIs
StatePublished - 2019 Jul 25

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Electrolytes
electric batteries
Cathodes
Metals
Anodes
cathodes
electrolytes
anodes
metals
Nitriles
Secondary batteries
Electromagnetic compatibility
cycles
Surface chemistry
Energy storage
nitriles
energy storage
adiponitrile
Thermodynamics
emerging

Keywords

  • Ni-rich NCM cathodes
  • bi-functional additives
  • fast charging
  • high-energy density
  • lithium-metal batteries

Cite this

@article{fb3bab9ac3d44681bea7eb5ff946df89,
title = "Adiponitrile (C6H8N2): A New Bi-Functional Additive for High-Performance Li-Metal Batteries",
abstract = "Rechargeable batteries with a Li metal anode and Ni-rich Li[NixCoyMn1−x−y]O2 cathode (Li/Ni-rich NCM battery) have been emerging as promising energy storage devices because of their high-energy density. However, Li/Ni-rich NCM batteries have been plagued by the issue of the thermodynamic instability of the Li metal anode and aggressive surface chemistry of the Ni-rich cathode against electrolyte solution. In this study, a bi-functional additive, adiponitrile (C6H8N2), is proposed which can effectively stabilize both the Li metal anode and Ni-rich NCM cathode interfaces. In the Li/Ni-rich NCM battery, the addition of 1 wt{\%} adiponitrile in 0.8 m LiTFSI + 0.2 M LiDFOB + 0.05 M LiPF6 dissolved in EMC/FEC = 3:1 electrolyte helps to produce a conductive and robust Li anode/electrolyte interface, while strong coordination between Ni4+ on the delithiated Ni-rich cathode and nitrile group in adiponitrile reduces parasitic reactions between the electrolyte and Ni-rich cathode surface. Therefore, upon using 1 wt{\%} adiponitrile, the Li/full concentration gradient Li[Ni0.73Co0.10Mn0.15Al0.02]O2 battery achieves an unprecedented cycle retention of 75{\%} over 830 cycles under high-capacity loading of 1.8 mAh cm−2 and fast charge–discharge time of 2 h. This work marks an important step in the development of high-performance Li/Ni-rich NCM batteries with efficient electrolyte additives.",
keywords = "Ni-rich NCM cathodes, bi-functional additives, fast charging, high-energy density, lithium-metal batteries",
author = "Lee, {Seon Hwa} and Jang-Yeon Hwang and Park, {Seong Jin} and Park, {Geon Tae} and Yang-Kook Sun",
year = "2019",
month = "7",
day = "25",
doi = "10.1002/adfm.201902496",
language = "English",
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journal = "Advanced Functional Materials",
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Adiponitrile (C6H8N2) : A New Bi-Functional Additive for High-Performance Li-Metal Batteries. / Lee, Seon Hwa; Hwang, Jang-Yeon; Park, Seong Jin; Park, Geon Tae; Sun, Yang-Kook.

In: Advanced Functional Materials, Vol. 29, No. 30, 1902496, 25.07.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Adiponitrile (C6H8N2)

T2 - A New Bi-Functional Additive for High-Performance Li-Metal Batteries

AU - Lee, Seon Hwa

AU - Hwang, Jang-Yeon

AU - Park, Seong Jin

AU - Park, Geon Tae

AU - Sun, Yang-Kook

PY - 2019/7/25

Y1 - 2019/7/25

N2 - Rechargeable batteries with a Li metal anode and Ni-rich Li[NixCoyMn1−x−y]O2 cathode (Li/Ni-rich NCM battery) have been emerging as promising energy storage devices because of their high-energy density. However, Li/Ni-rich NCM batteries have been plagued by the issue of the thermodynamic instability of the Li metal anode and aggressive surface chemistry of the Ni-rich cathode against electrolyte solution. In this study, a bi-functional additive, adiponitrile (C6H8N2), is proposed which can effectively stabilize both the Li metal anode and Ni-rich NCM cathode interfaces. In the Li/Ni-rich NCM battery, the addition of 1 wt% adiponitrile in 0.8 m LiTFSI + 0.2 M LiDFOB + 0.05 M LiPF6 dissolved in EMC/FEC = 3:1 electrolyte helps to produce a conductive and robust Li anode/electrolyte interface, while strong coordination between Ni4+ on the delithiated Ni-rich cathode and nitrile group in adiponitrile reduces parasitic reactions between the electrolyte and Ni-rich cathode surface. Therefore, upon using 1 wt% adiponitrile, the Li/full concentration gradient Li[Ni0.73Co0.10Mn0.15Al0.02]O2 battery achieves an unprecedented cycle retention of 75% over 830 cycles under high-capacity loading of 1.8 mAh cm−2 and fast charge–discharge time of 2 h. This work marks an important step in the development of high-performance Li/Ni-rich NCM batteries with efficient electrolyte additives.

AB - Rechargeable batteries with a Li metal anode and Ni-rich Li[NixCoyMn1−x−y]O2 cathode (Li/Ni-rich NCM battery) have been emerging as promising energy storage devices because of their high-energy density. However, Li/Ni-rich NCM batteries have been plagued by the issue of the thermodynamic instability of the Li metal anode and aggressive surface chemistry of the Ni-rich cathode against electrolyte solution. In this study, a bi-functional additive, adiponitrile (C6H8N2), is proposed which can effectively stabilize both the Li metal anode and Ni-rich NCM cathode interfaces. In the Li/Ni-rich NCM battery, the addition of 1 wt% adiponitrile in 0.8 m LiTFSI + 0.2 M LiDFOB + 0.05 M LiPF6 dissolved in EMC/FEC = 3:1 electrolyte helps to produce a conductive and robust Li anode/electrolyte interface, while strong coordination between Ni4+ on the delithiated Ni-rich cathode and nitrile group in adiponitrile reduces parasitic reactions between the electrolyte and Ni-rich cathode surface. Therefore, upon using 1 wt% adiponitrile, the Li/full concentration gradient Li[Ni0.73Co0.10Mn0.15Al0.02]O2 battery achieves an unprecedented cycle retention of 75% over 830 cycles under high-capacity loading of 1.8 mAh cm−2 and fast charge–discharge time of 2 h. This work marks an important step in the development of high-performance Li/Ni-rich NCM batteries with efficient electrolyte additives.

KW - Ni-rich NCM cathodes

KW - bi-functional additives

KW - fast charging

KW - high-energy density

KW - lithium-metal batteries

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DO - 10.1002/adfm.201902496

M3 - Article

VL - 29

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

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