Ethylene ethyl phosphate as a multifunctional electrolyte additive for lithium-ion batteries

Gao, Dongdong; Xu, Jiantie; Lin, Min; Xu, Qizhi; F., C.; Xiang, Hongfa

doi:10.1039/c4ra15899g

Cited by 38 publications

(38 citation statements)

References 39 publications

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“…To the best of our knowledge, this performance is more than the previous results, a comparison of this work with the latest literature has been made and the specific values are listed in Table S2 (Supporting Information). [ 42,43 ] In addition, the improvement of Li anode induced by the coadditives is also explored. The NMC//Li battery is disassembled after 100 cycles and then reassembled a new battery by replacing a fresh Li foil anode.…”

Section: Resultsmentioning

confidence: 99%

Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Chen

Zhao

Zhang

et al. 2020

Adv Funct Materials

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Ternary layered oxide materials have attracted extensive attention as a pro mising cathode candidate for high-energy-density lithium-ion batteries. However, the undesirable electrochemical degradation at the electrode-electrolyte interface definitively shortens the battery service life. An effective and viable approach is proposed for improving the cycling stability of the LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode using lithium difluorophosphate (LiPO 2 F 2 ) paired with fuoroethylene carbonate (FEC) as co-additives into conventional electrolytes. It is found that the co-additives can greatly reduce the interface charge transfer impedance and significantly extend the life span of LiNi 1/3 Co 1/3 Mn 1/3 O 2 //Li (NMC//Li) batteries. The developed cathode demonstrates exceptional capacity retention of 88.7% and remains structural integrity at a high current of 5C after 500 cycles. Fundamental mechanism study indicates a dense, stable fluorinated organic-inorganic hybrid cathode-electrolyte interphase (CEI) film derived from LiPO 2 F 2 in conjunction with FEC additives on the surface of NMC cathode material, which significantly suppresses the decomposition of electrolyte and mitigates the dissolution of transition metal ions. The interfacial engineering of the electrode materials stabilized by the additives manipulation provides valuable guidance for the development of advanced cathode materials.

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Section: Resultsmentioning

confidence: 99%

Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Chen

Zhao

Zhang

et al. 2020

Adv Funct Materials

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“…TMSPi 可抑制正极界面 Mn 的溶解, 而 VC 可减少负极 Mn 的沉积 , 因此提高了电池在 60 ℃ 的电化学性能 [102,103] . [113] , 兼具较好的阻燃性和成膜性. [8] .…”

Section: Tmspunclassified

Review of Electrolyte Additives for Ternary Cathode Lithium-ion Battery

Deng¹,

Sun²,

Wan³

et al. 2018

Acta Chim. Sinica

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, M＝Mn, NMC; M＝Al, NCA)} are one of the most promising cathode materials of lithium-ion batteries (LIBs). However, in the traditional electrolyte system, they will undergo dramatic structural changes and interface side reactions at high potential and high temperature, which will bring great challenges to their practical application, especially for their cycle life and safety. Developing appropriate electrolyte additive is one of the most economical and effective methods to improve the electrochemical performance of LIBs. Based on the intrinsic structure of material, electrolyte additives used for NMC and NCA ternary cathode and their reaction mechanism in the past 5 years are reviewed in this paper, which include vinylene carbonate (VC), fluoro-compounds, new lithium salts, P-based, B-based, S-based, nitrile, others and combinative additives. Among them, VC becomes a kind of universal additive, which can improve the efficiency and cycle life at low voltage and normal temperature. Fluoro-compounds have been developed from mono substituted such as Fluorinated ethylene carbonate (FEC) to multi-fluorine substituted, which can improve the stability of electrode/electrolyte interface under high voltage. New lithium salt additives are mainly used to improve the film forming performance under high voltage and high temperature, such as Lithium bis(fluorosulfonyl)imide (LiFSI), Lithium difluorophosphate (LiDFP). P-contained additives [such as Tris(trimethylsilyl)phosphite (TMSPi)] are mainly to improve the stability of anode-electrolyte interface, and it has obvious synergistic effect when they combined with additives such as VC. B-contained additives are mainly used to improve the dissociation degree and stability of lithium salt, such as Tris(trimethylsilyl)borate (TMSB). S-contained additives are mainly used to improve the ionic conductivity and stability of anode SEI film, such as Prop-1-ene-1,3-sultone (PES). Nitriles are benefited from the strong electron withdrawing effect of -CN, which can improve the stability of the electrode/electrolyte interface at high voltage. Other types of additives are some heterocyclic compounds having film forming ability and various silanes which can eliminate HF and H 2 O. Combinative additives are developed from VC based composite to PES and PBF (pyridine boron trifluoride) system, which can endure even harsher conditions.

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“…[10] This issue can be resolved by substituting the hydrogen atom(s) with fluorine. [8][9] Recently, Gao et al [11] reported the use of cyclic phosphate, namely ethylene ethyl phosphate (EEP) as a flame retardant cosolvent and showed that 10 % of EEP reduces the flammability of the electrolyte by 50 %. However, the electrolyte still burns for � 65 s/g and by the definition of Xu et al [7a] (flame retardant between SET: 6-20 s/g and as nonflammable with a SET: < 6 s/ g) this molecule cannot be considered as FR.…”

Section: Introductionmentioning

confidence: 99%

“…The cyclic 1,3,2-dioxaphospholane core structure is known to enhance cycling performance by forming an effective cathode electrolyte interface (CEI) via ring opening polymerization on the NMC111 electrode surface. [11][12] Additionally, this molecule features a side chain, which can be easily modified to bear a variety of functional groups, making it a very versatile core structure. Based on previous results, we selected the pentafluoropropyl group as a side chain to further support the flame retarding properties of the phospholane core.…”

Section: Introductionmentioning

confidence: 99%

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Non‐Flammable Fluorinated Phosphorus(III)‐Based Electrolytes for Advanced Lithium‐Ion Battery Performance

et al. 2020

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In the quest for ever higher energy and power densities of lithium‐based batteries, numerous functional materials are being utilized, however in many cases their highly reactive nature is likely to increase the risk of danger in case of battery failures. This especially affects the aprotic non‐aqueous organic carbonate‐based electrolyte, still considered as the state‐of‐the‐art (SOTA) and its volatile and highly flammable components. Efforts to identify different forms of flame‐retardants or nonflammable electrolyte solvents/co‐solvents to reduce the risk of fire or explosion are inevitably followed by a trade‐off between the improved safety and deteriorated overall cycling performance of a battery. Here, we report on a smartly tailored, multifunctional nonflammable electrolyte formulation comprising 15.0 wt.% 2‐(2,2,3,3,3‐pentafluoro‐propoxy)‐4‐(trifluormethyl)‐1,3,2‐dioxaphospholane (PFPOEPi‐1CF3), significantly advancing the cycling performance of the NMC111||graphite cells by formation of an effective interphase on/at both anode and cathode and correlate its performance to the 2‐(2,2,3,3,3‐pentafluoropropoxy)‐1,3,2‐dioxaphospholane (PFPOEPi) containing electrolyte counterpart by establishing a strong structure‐reactivity‐performance‐relationship.

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Ethylene ethyl phosphate as a multifunctional electrolyte additive for lithium-ion batteries

Abstract: The effects of ethylene ethyl phosphate (EEP) as a multifunctional electrolyte additive on safety characteristics and electrochemical performance of lithium-ion batteries are investigated.

Cited by 38 publications

References 39 publications

Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Review of Electrolyte Additives for Ternary Cathode Lithium-ion Battery

Non‐Flammable Fluorinated Phosphorus(III)‐Based Electrolytes for Advanced Lithium‐Ion Battery Performance

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Ethylene ethyl phosphate as a multifunctional electrolyte additive for lithium-ion batteries

Abstract: The effects of ethylene ethyl phosphate (EEP) as a multifunctional electrolyte additive on safety characteristics and electrochemical performance of lithium-ion batteries are investigated.

Cited by 38 publications

References 39 publications

Armoring LiNi1/3Co1/3Mn1/3O2 Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Armoring LiNi1/3Co1/3Mn1/3O2 Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Review of Electrolyte Additives for Ternary Cathode Lithium-ion Battery

Non‐Flammable Fluorinated Phosphorus(III)‐Based Electrolytes for Advanced Lithium‐Ion Battery Performance

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Product

Resources

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Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery

Armoring LiNi_1/3Co_1/3Mn_1/3O₂ Cathode with Reliable Fluorinated Organic–Inorganic Hybrid Interphase Layer toward Durable High Rate Battery