Effect of Fluoroethylene Carbonate Electrolyte Additives on the Electrochemical Performance of Nickel-Rich NCM Ternary Cathodes

She, Shengxian; Zhou, Yangfan; Hong, Zijian; Huang, Yu; Wu, Yongjun

doi:10.1021/acsaem.3c01025

Cited by 10 publications

(2 citation statements)

References 32 publications

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“…Another approach is the in situ construction of the cathode–electrolyte interface (CEI) through the addition of certain additives. For example, carbonate (FEC), tributyl borate (TBB), and adiponitrile have been used as additives to facilitate the formation of a protective CEI layer. This approach improves the stability of the CEI and enhances the cycle performance.…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

Lin,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Lithium-ion batteries (LIBs) are known for their high energy density but exhibit poor cyclic stability and safety risks due to side reactions between the electrode and electrolyte. To address these issues, a novel approach involving construction of a polymer coating layer (PCL) via in situ self-polymerization using 2,2,3,4,4,4-hexafluorobutyl methacrylate (HFBM) as an electrolyte additive on the cathode is proposed. The PCL endows the electrolyte with a high onset oxidation potential (4.78 V) and lithium-ion transference number (0.52). The uniform and robust in situ constructed PCL can effectively inhibit the severe irreversible side reactions and suppress harmful reactions, thus providing a protective barrier against degradation. The resulting Li||Li-Ni 0.8 Co 0.1 Mn 0.1 O 2 batteries exhibit an improved discharge capacity retention of 80% at 1C over 100 cycles. These results demonstrate that the in situ self-polymerization strategy holds promising potential for enhancing LIB performance and long-term stability, especially when high-voltage cathode materials are used.

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Section: Introductionmentioning

confidence: 99%

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

Lin,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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“…Yang et al found that 3-(trifluoromethyl)benzoylacetonitrile can be preferentially oxidized to form a stable and dense CEI film, which inhibits the continuous oxidation and decomposition of the electrolyte, thereby safeguarding the structural integrity of NCM811 particles. She et al revealed that the addition of FEC can promote the formation of LiF-rich CEI films, which helps to stabilize the cathode at a lower rate and low cutoff voltage. However, the decomposition of both LiPF 6 and FEC at a higher rate and higher voltage could form thick LiF-rich CEI films that hindered Li + migration, leading to higher polarization and lower capacity retention.…”

Section: Introductionmentioning

confidence: 99%

Stable and Fast Ion Transport Electrolyte Interfaces Modified with Novel Fluorine- and Nitrogen-Containing Solvents for Ni-Rich Cathode Materials

Peng,

Shen,

et al. 2024

ACS Appl. Mater. Interfaces

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Ternary nickel-rich layered oxide LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is recognized as a cathode material with a promising future, attributed to its high energy density. However, the pulverization of cathode particles, structural collapse, and electrolyte decomposition are closely associated with the fragile cathode−electrolyte interphases (CEI), which seriously affect the electrochemical performances of ternary high-nickel materials. In this paper, fluorine-and nitrogen-containing methyl-2-nitro-4-(trifluoromethyl)benzoate (MNTB) was selected, which was synergistically regulated with fluoroethylene carbonate (FEC) to generate a robust CEI film. The preferential decomposition of MNTB/FEC results in the formation of an inorganic-rich (Li 3 N, LiF, and Li 2 O) CEI film with uniformly dense and stable characteristics, which is conducive to the migration of Li + and the stability of the NCM811 structure and enhances the cycling stability of the battery system. Simultaneously, MNTB effectively suppresses the adverse reaction associated with increased polarization caused by higher interface impedance due to conventional single FEC additives, further improving the rate capability of the battery. Moreover, MNTB/FEC can effectively eliminate HF, preventing its corrosion on the NCM811 cathode. Under the synergistic effect of MNTB/FEC, after 300 discharge cycles at a high cutoff voltage of 4.3 V and a current density of 1 C (2 mA cm −2 ), the discharge capacity of the NCM811||Li battery was 150.12 mA h g −1 with a capacity retention of 81.10%, while it was only 32.8% for the standard electrolyte (STD). The discharged capacity of the MNTB/FECcontaining battery was about 115.43 mA h g −1 at the high rate of 7 C, which was considerably higher than that of the STD (93.34 mA h g −1 ). In this study, the designed MNTB as a novel solvent synergistically regulated with FEC will contribute to the enhanced stability of NCM811 materials at high cutoff voltages and at the same time provide an effective modified strategy to enhance the stability of commercial electrodes.

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Long‐Lifespan 522 Wh kg⁻¹ Lithium Metal Pouch Cell Enabled by Compound Additives Engineering

Tang,

Sun,

et al. 2024

Angewandte Chemie

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Matching high‐voltage cathodes with lithium metal anodes represents the most viable technological approach for developing secondary batteries with ultra‐high energy density exceeding 500 Wh kg‐1. Nevertheless, the instability of electrolyte/electrode interface film and commercial electrolytes with cut‐off voltage above 4.3 V is still a major concern. Herein, we present that excellent cycling stability with an ultra‐high cut‐off voltage of up to 5.0 V can be obtained by using three‐component additives containing fluoroethylene carbonate (FEC), hexadecyl trimethylammonium chloride (CTAC), and tri(pentafluorophenyl)borane (TPFPB). Excellent ionic conductivity, robust interfacial films on both electrodes, and long‐lasting uniform Li+ regulation ability can be obtained in the modifying electrolyte. Consequently, using a high plating/stripping capacity of 3 mAh cm‐2 under the current density of 1 mA cm‐2, lithium symmetric cells demonstrate stable cycling performance exceeding 800 hours. Meanwhile, the 7.3 Ah‐class Li[NixCoyMn1‐x‐y]O2 (x=0.83, NCM83)| Li pouch cells are assembled, which show a high energy density of 522 Wh kg‐1 and present excellent stability over 178 cycles with a high initial coulombic efficiency (CE) of 98.0%.

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Effect of Fluoroethylene Carbonate Electrolyte Additives on the Electrochemical Performance of Nickel-Rich NCM Ternary Cathodes

Cited by 10 publications

References 32 publications

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

Stable and Fast Ion Transport Electrolyte Interfaces Modified with Novel Fluorine- and Nitrogen-Containing Solvents for Ni-Rich Cathode Materials

Long‐Lifespan 522 Wh kg⁻¹ Lithium Metal Pouch Cell Enabled by Compound Additives Engineering

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Effect of Fluoroethylene Carbonate Electrolyte Additives on the Electrochemical Performance of Nickel-Rich NCM Ternary Cathodes

Cited by 10 publications

References 32 publications

In Situ Construction of a Polymer Coating Layer on the LiNi0.8Co0.1Mn0.1O2 Cathode for High-Performance Lithium-Ion Batteries

In Situ Construction of a Polymer Coating Layer on the LiNi0.8Co0.1Mn0.1O2 Cathode for High-Performance Lithium-Ion Batteries

Stable and Fast Ion Transport Electrolyte Interfaces Modified with Novel Fluorine- and Nitrogen-Containing Solvents for Ni-Rich Cathode Materials

Long‐Lifespan 522 Wh kg−1 Lithium Metal Pouch Cell Enabled by Compound Additives Engineering

Contact Info

Product

Resources

About

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

In Situ Construction of a Polymer Coating Layer on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for High-Performance Lithium-Ion Batteries

Long‐Lifespan 522 Wh kg⁻¹ Lithium Metal Pouch Cell Enabled by Compound Additives Engineering