ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaoli Peng,Hongmei Shen,Kai Su,Wenjie Wang,Shijie Weng,Chenxia Tang,Zhiyu Xue,Yong Xiang
Ternary nickel-rich layered oxide LiNi0.8Co0.1Mn0.1O2 (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 (Li3N, LiF, and Li2O) 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/FEC-containing 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.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Fangfang Shang,Hengdao Quan,Xiaoxun Ma
In this study, 3-trifluoromethylpyrazole (TMPZ) was developed as a multifunctional electrolyte additive to enhance wettability between separator and electrolyte, CEI formation and remove HF to improve the performance of Li/NCM622 batteries by experiment and theoretical calculation. After 200 cycles at 30 °C, the discharge capacity retention of batteries at 1 C with 0.5 wt% TMPZ additive is remarkably enhanced from 68.3 % to 83.2 %. The enhanced electrochemical performance of the batteries by adding TMPZ additive is evaluated by the spectroscopic characterization and theoretical calculation. It is demonstrated that TMPZ can generate uniform and dense CEI film via ring-opening electrochemical polymerization of TMPZ on the NCM622 electrode surface. The CEI film helps to suppress the breakdown of LiPF 6 electrolyte and the leaching of transition metals, effectively avoiding harmful side reactions between the NCM622 electrode and the electrolyte. Furthermore, introducing TMPZ can enhance the wettability between separator and electrolyte, therefore providing more channels of Li + to accelerate reaction kinetics of batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jinping Mu,Aijia Wei,Xiaohui Li,Rui He,Lijing Sun,Peizhao Liu,Xue Bai,Lihui Zhang,Xi Zhang,Zhenfa Liu,Jing Gao
Tris (trimethylsilyl) phosphate (TMSP) and tris(2,2,2-trifluoroethyl) phosphate (TTFP) was added to carbonate solvent-based electrolytes as dual-additives to enhance the performance of LiNi 0·5 Mn 1·5 O 4 (LNMO). The X-ray photoelectron spectroscopy results revealed that both TMSP with high oxidation ability and TTFP with high oxidation resistance participated in the formation of cathode–electrolyte interphase (CEI) films. Electrochemical impedance spectroscopy confirmed that the constructed CEI films had excellent electronic insulation and ionic conductivity , reducing the interfacial impedance of the LNMO electrode, and improving the electrochemical performance of LNMO/Li half-cells and LNMO/Li 4 Ti 5 O 12 full-cells. As measured by the nuclear magnetic resonance , the incorporation of TMSP and TTFP significantly reduced the HF content in the electrolytes. Therefore, both LNMO/Li half-cells (500 cycles with 95.7% capacity retention) and LNMO/Li 4 Ti 5 O 12 full-cells (200 cycles with 79.9% capacity retention) displayed higher cycling stabilities at 5 C owing to the synergistic effect of TMSP and TTFP. In comparison, capacity retentions of ∼76.5% after 500 cycles and ∼37.2% after 200 cycles were respectively achieved for the LNMO/Li half-cells and LNMO/Li 4 Ti 5 O 12 full-cells with the standard electrolyte at 5 C. This study provides strong evidence that additive combinations can improve the electrochemical performance of high-energy and high-voltage cathode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weixia Lv,Caijian Zhu,Jun Chen,Caixia Ou,Qian Zhang,Shengwen Zhong
In this work, the solvent and lithium salt are modified simultaneously to improve the low temperature performance of the electrolyte. The butyl acrylate (BA) with low melting point and high dielectric constant is combined with the ethylene carbonate (EC) with high dielectric constant and excellent film-forming property, which used as mixed additives. On the other hand, the LiBF 4 with small ion size and large ion mobility is chose to mixed with LiPF 6 with best comprehensive performance, which are used as mixed lithium salts. The BA + EC + LBF mixed additives improves the solubility, conductivity and melting point of the electrolyte, and effectively improves the composition, thickness and uniformity of the CEI film, which together increased the capacity and voltage platform of the batteries at low temperatures. The discharge capacities of BA16%+EC10%+0.3 M LBF battery at −10, −20, −30 and −40 °C are 173.1, 156.0, 147.0, and 119.3 mAh/g respectively, which are much higher than the batteries with the electrolyte without adding additives (122.0, 107.8, 95.7, and 74.3 mAh/g respectively). Furthermore, BA + EC + LBF can form a porous and thin LiF CEI film on the cathode surface, which is very favorable for transport of Li + , further improve the behaviors of the batteries at different low temperatures. Even in the case of charging and discharging at −40 °C, its discharge capacity can be stably maintained at 85 mAh/g. The BA + EC + LBF mixed additives used in this work as an effective strategy to improve the comprehensive behaviors of the battery at low temperatures, which would provide a new insight to design high performance of low temperature electrolyte.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 53
·12233-12241
·
IF 4.857
Chunlei Tan,Na Wang,Qichang Pan,Yan Li,Yu Li,Qiannan Ji,Xiaoping Fan,Fenghua Zheng,Hongqiang Wang,Qingyu Li
Graphical Butyric anhydride was used as carbonate-based electrolyte additive to construct a thin, uniform cathode–electrolyte interphase (CEI) film that can alleviate the decomposition of the electrolyte and prevent the dissolution of metal ions to maintain the structural stability of LiNi 0.5 Mn 1.5 O 4 (LNMO) during the cycling process, and improve the electrochemical performance of LNMO cathodes in carbonate-based electrolytes. Butyric anhydride (BA) is used as an effective functional additive to improve the electrochemical performance of a high-voltage LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode. In the presence of 0.5 wt % BA, the capacity retention of a LNMO/Li cell is significantly improved from 15.3 to 88.4 % after 200 cycles at 1 C. Furthermore, the rate performance of the LNMO/Li cell is also effectively enhanced, and the capacity goes up to 112 mAh g −1 even at 5 C, which is considerably higher than that of a LNMO/Li cell in electrolyte without BA additive (95.4 mAh g −1 at 5 C). Linear sweep voltammetry and cyclic voltammetry results reveal that the BA additive can be preferentially oxidized to construct a stable cathode electrolyte interphase (CEI) film on the LNMO cathode. Subsequently, the BA-derived CEI film can alleviate the decomposition of the electrolyte and the dissolution of Mn and Ni ions from the LNMO cathode as well as maintain the structural stability of LNMO during the cycling process; this leads to outstanding electrochemical performance. Thus, this work provides an effective and low-cost functional electrolyte for high-voltage LNMO-based LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Shili Wang,Shimou Chen,Weiqun Gao,Lili Liu,Suojiang Zhang
In this paper, we propose a new electrolyte additive 3-Isocyanatopropyltriethoxysilane (IPTS) to improve the cycle stability and rate performance of Ni-Rich (LiNi 0·6 Co 0·2 Mn 0·2 O 2 ) cathode half-cell. Density function theory calculations suggest that IPTS has higher HOMO energy than solvent, which can decompose preferentially. Moreover, we confirm the oxidative decomposition by the linear scanning cyclic voltammetry , which can achieve stable at a cutoff voltage of 2.5–4.5 Vs. (Li/Li + ). The cyclic voltammetry curves at different scan rates indicate that the migration rate of lithium ions is higher in the cells with 0.5% additive than in the base electrolyte. After 150 cycles, the capacity retention rates in the base electrolyte and in the additive-containing electrolyte are 55.4% and 73.1%, respectively. X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy show that the additive is involved in film formation, and the obtained CEI film is very uniform and dense, which play a key role in stabilizing the electrolyte under high voltage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Jian Lv,Zhuyu Wang,Yihuan Zhou,Weihao Yu,Qinggong Jia
Due to long-term operation under high voltage, the cathode of lithium metal battery undergoes parasitic reactions with the electrolyte, resulting in non-conductive polymers that severely affect the battery's electrochemical performance and kinetics. In addition, the safety performance of the battery is seriously compromised by severe lithium deposition on the lithium metal side. The use of electrolyte additives is one of the most cost-effective strategies for improvement. A low-cost boron-based additive bis(pinacolato)diboron (BDB) has been proposed in this work which has relatively high activity during battery charging and discharging. A protective cathode electrolyte interface (CEI) film was formed by BDB on the surface of NCM811 in advance to resist HF and solvent erosion. Furthermore, the solid electrolyte interface (SEI) film that BDB participates in on the lithium metal surface exhibits high ion conductivity and effectively inhibits the formation of lithium dendrites, thereby ensuring the safe operation of lithium metal batteries. The lithium metal battery utilizing BDB not only exhibits optimal electrochemical performance with a high cut-off voltage of 4.6 V, but also demonstrates potential for further development in the realms of rapid charging and discharging.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Jian Lv,Zhuyu Wang,Yihuan Zhou,Yiwen Wang,Danni Shen,Qinggong Jia
Cathodes containing Ni, Co, and Mn frequently undergo side reactions with the electrolyte during the long cycles of the battery in traditional electrolytes under high voltage. In this work, an efficient composite cathode–electrolyte interface (CEI) film is constructed in situ with two additives; that is, 2-[(trimethylsilyl)ethynyl]thiophene (TET) is oxidized and polymerized in advance to form a film attached to the cathode surface, while oxidation products of bis(pinacolato)diboron (BDB) as a high ion conductor are doped into the TET polymer film. The combination of the oxidation products of the two additives not only effectively isolates solvent molecules and hydrofluoric acid erosion, preventing the occurrence of side reactions, but also does not affect the transfer of lithium ions. The crystal structure stability of LiNi0.8Mn0.1Co0.1O2 (NCM811) could be effectively regulated by the composite CEI film through in situ X-ray diffraction characterization during the charge–discharge process. The dynamic performance of the battery has also been improved by comparing the discrepancy of pseudocapacitance across the battery with different electrolytes. Furthermore, the solid–electrolyte interface film formed by TET and BDB could provide effective protection for lithium metal from electrolyte corrosion and inhibit the formation of lithium dendrites. Therefore, the battery capacity retention rate could reach 91.12% after 300 cycles. In addition, the battery with a high-load cathode (2.52 mAh cm–2) has a capacity retention rate of up to 90.19% after 50 cycles, which may make the future application of pouch batteries more feasible.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hao Wang,Daming Sun,Xiang Li,Wujie Ge,Bangwei Deng,Meizhen Qu,Gongchang Peng
Three kinds of functional organosilicons electrolyte additives, i. e. octamethylcyclotetrasiloxane (D4), octamethylcyclotetrasiloxane (OMCTS) and 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetra- siloxane (ViD4), are firstly used to produce high-performance LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode for rechargeable Lithium-ion batteries (NCM622/Li half-cell) at a high potential. The electrochemical performance tests at 4.5 V suggest that ViD4 is the most promising electrolyte additive than its counterparts. Moreover, the prepared NCM622/Li half-cell with 0.5 wt.% ViD4 exhibits an improved energy density of 187.2 mAh g −1 and a good discharge capacity retention of 83.6% at 1C rate after 150 cycles at 4.5 V, which is relatively higher than that with D4 (81.3%), OMCTS (81.9%) and much better than the bare electrolyte (76.1%). The electrochemical characterizations, density functional theory calculation and surface analysis provide strong evidences that combined effects of the Si-O bond and vinyl functional group in ViD4 can promote the formation of a uniform cathode electrolyte interphase (CEI) film. Moreover, the ViD4-incorporated CEI film effectively enhances the interfacial stability between the NCM622 cathode and the electrolyte by suppressing the continuous decomposition of carbonate-based electrolyte and the exfoliation of these decomposition products. Hence, the ViD4-containing electrolyte shows a promising potential for the application in high energy density lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Cheng Chen,Jiali Guo,Chunlei Wu,Xianjian Duan,Lingzhi Zhang
Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered the most prominent cathode material to establish a practical high energy density of lithium-ion batteries (LIBs) for future electric vehicles. The energy density of LIBs is greatly determined by the capacity of electrode materials and the operating voltage of the cells. To further improve the cycle lifespan of NCM811 batteries to meet the requirement of driving range for the electric vehicle market, it is vital to design a novel electrolyte additive that can enhance the stability of the cathode/electrolyte interface at a wide range of voltage. Herein, a novel borate functionalized disiloxane compound, 1,1,1,3,3-pentamethyl-3-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl) disiloxane (PMBPDS), is synthesized as cathode electrolyte interphase (CEI) film-forming additive to improve the cycling performance of NCM811 batteries. Systematic studies reveal that PMBPDS can construct a stable CEI film on the NCM811 surface and efficiently scavenge hydrofluoric acid (HF). The PMBPDS-derived CEI prevents the dissolution of transmission metals in the NCM811 cathode and enhances the capacity retention of NCM811/graphite cells from 68.3 to 70.6% after 200 cycles at 1 C in the voltage window of 3–4.5 V. This work provides more understanding on designing the molecular structure of additive compounds for improving the electrochemical performance of LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xuan Wang,Shuo Huang,Benben Wei,Min Liu,Bo Yang,Ruoqing Liu,Hongyun Jin
All-solid-state batteries with oxide electrolytes and high-nickel layered oxide cathodes (LiNixCoyMnzO2 and LiNixCoyAlzO2, x + y + z = 1, x ≥ 60%) have received widespread attention owing to their high energy density and high safety. However, they generally suffer from interfacial structural instability when coupled with solid-state electrolytes, which strongly diminishes the longevity of the battery. In this work, we propose adding a sacrificial additive C60 to the catholyte buffer layer between Li1.4Al0.4Ti1.6(PO4)3 (LATP) and LiNi0.8Co0.1Mn0.1O2 (NCM811) to enhance the electrochemical stability under high-voltage operating conditions. A uniform and robust cathode–electrolyte interphase (CEI) film enriched with LixPOyFz, LiPxFy, and C60Fn is spontaneously formed on the surface of the cathode particles. In addition, the NCM811/Li solid-state battery delivers a discharge capacity of 150.3 mAh g–1 with a retention of 85% after 200 charge–discharge cycles at 0.5 C. This study offers a practical approach toward realizing LATP-based all-solid-state high-voltage batteries characterized by exceptional cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guangxiang Zhang,Chi Ma,Chuankai Fu,Ziwei Liu,Haoquan Zhao,Meng Chen,Qingmo Shi,Hua Huo,Pengjian Zuo,Geping Yin,Yulin Ma
High-performance sodium-ion batteries (SIBs) require not only non-aqueous electrolytes with high ion conductivity but also high interfacial compatibility with both electrodes. Ether-based electrolytes are considered one of the most promising electrolyte systems for SIBs due to the advantages of high reduction stability and weakly desolvating power. However, conventional ether-based electrolytes are easy to decompose and deteriorate on the cathode/electrolyte interface under high voltage, which greatly restricts their practical application in SIBs. Herein, a novel and effective interfacial stabilization strategy is proposed and systemically investigated. A homogeneous and compact cathode electrolyte interphase (CEI) film rich in fluorides and borides can be successfully constructed on the cathode surface by pre-cycling of NVP@C cathode in the NaODFB-DEGDME electrolyte. The ODFB anion-derived CEI film can effectively inhibit the continuous oxidation decomposition of NaPF 6 -DEGDME electrolytes. As a result, the Na||NVP@C half-cell can stably cycle for 1500 cycles with high average Coulombic efficiency (CE, >99.7 %) at 5C. This work illustrates the significance of the composition and structure of CEI film for improving the interfacial stability of high-voltage SIBs with ether-based electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）