ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wen-Qing Wang,Cong Xia,Chen-Ting Zhu,Yue-Yang Wu,Jian-Hua Cao,Yue Li,Da-Yong Wu
Li1+xAlxTi2–x(PO4)3 (LATP) is a NASICON-type solid electrolyte that presents stability in aqueous media and high ion conductivity. With these advantages, it is expected to be used as a cathode and separator coating material for lithium-ion batteries to improve battery performance. However, it also displays a high level of residual moisture introduction due to its strong water absorption. Meanwhile, LATP particle size is a key influential factor for the residual moisture level and thereby produces an impact on the battery performance. In this research, we prepared three different particle sizes of LATP (100, 500, and 1000 nm) to investigate their effects as separator coatings on residual moisture and NCM811 battery performance. The results indicate that the water absorption of LATP is much higher than that of Al2O3 with the same particle size; the use of nanoscale LATP keeps the residual moisture of the LATP/PE separator rather high. When the particle size is in the range of 100–1000 nm, the battery’s cycling performance gradually deteriorates with the decrease of the particle size, among which the degradation of rate performance is more noticeable. More importantly, the research finds that LATP particles coated with polydopamine (PDA) can effectively reduce the coating’s residual moisture. After being coated with PDA, LATP particles with a particle size of 1000 nm result in the residual moisture content within the composite separator decreasing from 2136 to 408 ppm, thereby contributing to the optimal performance of NCM811||Li and NMC811||C batteries.
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
Batteries & Supercaps
·
2024
·
IF 5.1
Jian-Hua Cao,Peng Zhang,Ya-kun Wang,Da-Yong Wu
Graphical 2,2,2-trifluoroethyl phosphite (DETFPi), 1,3-Dioxolane (DOL) and trimethylolpropane tri(methacrylate) (TTE) were polymerized under LiBF 4 initiator on the LATP/PE/LATP separator and thereby obtained DETFPi-PDOL/LATP composite electrolyte after 24 h at room temperature. LATP coating on the surface of the PE separator can improve the cycling stability, rate performance, and interface state of NCM811 batteries. 1,3-Dioxolane (DOL) can undergo in-situ polymerization in batteries to form solid-state organic electrolyte PDOL. When applied to NCM811||Li battery system, PDOL electrolyte helps optimize the contact and interface stability between electrolyte and electrodes. This study explores the effects of PDOL with PE separators coated with Li1 .3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) on the performance of NCM811||Li batteries. 2,2,2-trifluoroethyl phosphite (DETFPi), was mixed with DOL at a 1 : 35 mass ratio. Then, LiBF 4 was used to initiate in-situ polymerization and thereby obtained DETFPi-PDOL electrolyte after 24 h at room temperature. The composite electrolyte exhibits enhanced ion conductivity (1.59×10 −4 S cm −1 ), high lithium ion transference number (0.78), wide electrochemical stability window (4.53 V), and high critical current density (2.2 mA cm −2 ). Li||PDOL@LATP||Li battery shows extremely low overpotential (35 mV) after a constant current stable cycle of 500 h at 1.0 mA cm −2 . After 500 cycles at 1 C, the remaining capacity is 153.9 mAh g −1 with a capacity retention of 82.1 % in NCM811||PDOL@LATP||Li batteries. This indicates that the LATP coating on the surface of the PE separator plays an important role in optimizing the performance of DETFPI-PDOL electrolyte batteries. LATP and DETFPI-PDOL are effective in improving the cycling stability, rate performance, and interface state of NCM811 batteries.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2025
·Vol. 18
·期 9
·4362-4372
·
IF 30.8
Shengyao Luo,Mengqi Wu,Said Amzil,Tonghui Xu,Qing Ming,Lei Zhang,Jie Gao,Shuang Tian,Donghai Wang,Yisen Qian,Ya-Jun Cheng,Yonggao Xia
The combination of high-nickel cathodes with lithium metal anodes is widely considered a promising solution to alleviate range anxiety. However, challenges such as limited fast-charging capacity and rapid degradation persist when using carbonate-based electrolytes. While many researchers predominantly focus on solvation structures, we have strategically tailored the electrolyte formulation by employing isopropyl acetate as the primary solvent, evidenced by interfacial interactions. Compared to n-propyl acetate, isopropyl acetate reduced the interaction with the electrode surface, promoted tighter adsorption of the electrolyte ion network within the inner Helmholtz layer, and ultimately enhanced the dynamic stability of the lithium metal interface. In Li‖NCM811 cells, this electrolyte demonstrates a 4.5 V cutoff and sustains 88.6% capacity retention over 200 cycles at a high rate of 15C. Additionally, this electrolyte demonstrates stable cycling performance at elevated rates of 1C and 5C at temperatures of 60 °C and −20 °C, respectively, while maintaining stability even at a rate of 10C under poor electrolyte conditions with thin lithium layers, indicating significant application potential. These studies reveal that the electrolyte distribution at the electrode interface affects the electrochemical process and the formation of the electrode–electrolyte interphase significantly, offering new ideas for future electrolyte research and design.
研究领域:
电化学
·
储能技术
·
材料科学
·
电池技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Hui Chen,Yu-Xiang Xie,Long-Ji Dong,Hao Peng,Meng-Wei Lin,Miao-Lan Sun,Shi-Shi Liu,Jun-Bo Ma,Ling Huang,Shi-Gang Sun
Lithium-ion batteries, with high energy density and long cycle life, have become the battery of choice for most vehicles and portable electronic devices; however, energy density, safety and cycle life require further improvements. Single-functional group electrolyte additives are very limited in practical applications, a ternary polymer bifunctional electrolyte additive copolymer (acrylonitrile-butyl hexafluoro methacrylate- poly (ethylene glycol) methacrylate- methyl ether) (PMANHF) was synthesized by free radical polymerization of acrylonitrile, 2, 2, 3, 4, 4, 4-hexafluorobutyl methacrylate and poly (ethylene glycol) methyl ether methacrylate. A series of characterizations show that in Li metal anodes, the preferential reduction of PMANHF is conducive to the formation of a uniform and stable solid electrolyte interphase layer, and Li deposition is uniform and dense. At the NCM811 cathode, a film composed of LiF- and Li3N-rich is formed at the cathode-electrolyte interface, mitigating the side reaction at the interface. At 1.0 mA cm-2, the Li/Li cell can be stabilized for 1000 cycles. In addition, the Li/NCM811 cell can stabilize 200 cycles with a cathode capacity of 153.7 mAh g-1, with the capacity retention of 89.93%, at a negative/positive capacity ratio of 2.5. This study brings to light essential ideas for the fabrication of additives for lithium-metal batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Shijie Lu,Xiaorong Chu,Chunli Li,Zhikun Zhao,Jianxiong Xiao,Borong Wu,Daobin Mu
High ionic conductivity and good interface compatibility have always been two major bottlenecks for solid-state electrolytes. Herein, a composite electrolyte membrane comprising poly (propylene carbonate), PVDF-HFP and Li 6 · 3 La 3 Zr 1 · 4 Ta 0 · 6 O 12 is successfully prepared via electrospinning. With the assistance of succinonitrile, the synthesized solid-state electrolyte exhibits high ionic conductivity (1.32 × 10 −3 S cm −1 at room temperature), oxidation potential up to 4.5 V vs Li/Li + and high Li + transference number (0.81). This desirable performance is attributed to the combination of PPC with good Li + conduction ability and PVDF-HFP with excellent mechanical properties, forming a continuous transport framework within the electrolyte. The introduced active fillers and small molecular additive not only benefit to fast Li + mobility, but also reinforce the stability towards Li metal. Li symmetric cell using the solid-state electrolyte can last for 800 h at a current density of 1.0 mA cm −2 with a low overpotential. The NCM811 cell using the electrolyte membrane shows high initial discharge specific capacity (184.3 mAh g −1 at 1 C) and good capacity retention (80.1% after 300 cycles at 30 °C).
研究领域:
材料科学
·
电化学
·
电池技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）