JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 49
·期 1
·773-779
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IF 1.676
Zheng Jinjie,Xu Huizhong,Yang Yaokang,Liu Lintao,Wu Haitao
Low-firing 1–4 wt.% LiF-doped Li 2 Mg 3 Ti 0.95 (Mg 1/3 Ta 2/3 ) 0.05 O 6 (LMTT) ceramics were synthesized via solid state reaction method. The effects of LiF on the phase composition, sintering behavior as well as microwave dielectric properties were systematically discussed. Adding LiF additives could lower the sintering temperature to 950°C for LMTT ceramics. X-ray powder diffraction analysis indicated that all the compounds prepared in this work have cubic symmetry with space group Fm - 3m . Typically, LMTT with 2 wt.% LiF exhibited a dense uniform microstructure and optimized microwave dielectric properties of ε r ∼ 15.1 (± 0.2), Q · f ∼ 60,100 GHz (at 8.3 GHz), and τ f ∼ − 20.45 ppm/°C at 950°C. In addition, the good chemical compatibility with Ag electrode made LMTT-2 wt.% LiF ceramic an appropriate candidate for low temperature co-fired ceramic.
研究领域:
材料科学
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电子材料
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Chenxi Cai,Jiamao Li,Junxian Wang,Yuxuan Ren,Yunfeng Guo
Development of low-temperature co-fired ceramics (LTCC) is a worldwide focus due to high integration, energy saving, and environmental friendliness. Herein, a beneficial attempt was made to decrease the sintering temperature of the Li2Mg6TiO9 (L2M6T) ceramic via doping LiF for LTCC applications. Furthermore, the phase structure, microstructure, and microwave dielectric properties of the doped ceramics were investigated in detail. The densification temperature of L2M6T was significantly reduced from 1450 to 1025 °C after LiF doping, which was conducive to energy saving. A small amount of LiF doping resulted in the formation of a MgO-type solid solution. The increase in molecular polarizability led to an increase in the dielectric constant (εr). An appropriate amount of LiF doping reduced the lattice vibration damping behavior, which in reverse improved the quality factor (Q × f). The substitution of F– ion for the O2– ion increased the bond energy of the total chemical bond, optimizing the temperature coefficient of resonant frequency (τf). The L2M6T ceramic-doped 3 wt % LiF presented the best microwave dielectric properties of εr = 12.37, Q × f = 112,400 GHz, and τf = −29.5 ppm/°C. In addition, the ceramic sintered at 950 °C exhibited great chemical compatibility with silver electrodes, indicating that it is potentially valuable for LTCC applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 35
·19046-19055
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IF 11.9
Huanhuan Duan,Leiping Liao,Ran Bi,Yuanfu Deng,Guohua Chen
Lithium–sulfur (Li–S) batteries configured with solid-state electrolytes (such as poly(ethylene oxide), PEO), featuring high energy density and safety, seem to have become one of the promising next-generation storage devices. Polysulfide shuttle and lithium dendrite formation still need to be tackled in PEO-based lithium sulfur batteries. In this work, we have developed a functional electrolyte additive, viz. MgF2 (or AlF3) with strong Lewis acidity, to resolve the above dilemma. The introduction of MgF2 restricts the migration of polysulfide species by Lewis acid–base interaction and thus, significantly enhances the coulombic efficiency (more than 98.5% @0.05C, 1C = 1675 mA g−1). Also, a robust SEI composed of LiF-rich and LixMg alloy layer is constructed on the anode, inhibiting the brutal growth of lithium dendrites. The MgF2-functional solid-state electrolyte achieves stable lithium plating/stripping cycles up to 500 h at 0.2 mA cm−2 in a Li//Li symmetric battery. A Li–S battery using such a modified PEO-based electrolyte delivers a high capacity of 982 mA h g−1 and enhanced cyclability (90% capacity retention ratio for 40 days' cycles) at 0.05C. This work provides a guideline for the design of high-performance, long-life PEO-based all solid-state Li–S batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chengliang Lin,Jiaxuan Yin,Shengrui Cui,Xiang Huang,Wei Liu,Yongcheng Jin
High-voltage spinel LiNi0.5Mn1.5O4 (LNMO), which has the advantages of high energy density, low cost, environmental friendliness, and being cobalt-free, is considered one of the most promising cathode materials for the next generation of power lithium-ion batteries. However, the side reaction at the interface between the LNMO cathode material and electrolyte usually causes a low specific capacity, poor rate, and poor cycling performance. In this work, we propose a facilitated method to build a well-tuned dual structure of LiF coating and F– doping LNMO cathode material via simple calcination of LNMO with LiF at low temperatures. The experimental results and DFT analysis demonstrated that the powerful interface protection due to the LiF coating and the higher lithium diffusion coefficient caused by F– doping effectively improved the electrochemical performance of LNMO. The optimized LNMO-1.3LiF cathode material presents a high discharge capacity of 140.3 mA h g–1 at 1 C and 118.7 mA h g–1 at 10 C. Furthermore, the capacity is retained at 75.4% after the 1000th cycle at 1 C. Our research provides a concrete guidance on how to effectively boost the electrochemical performance of LNMO cathode materials.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Y.K. Yang,F.L. Liu,Y.W. Zhang,M.F. Li,F. Ling,H.T. Wu
In this work, ultra-low loss Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 ceramics were successfully prepared via the conventional solid-state method. X-ray photoelectron spectroscopy (XPS), thermally stimulated depolarization current (TSDC) and bond energy were used to determine the distinction between intrinsic and extrinsic dielectric loss in (Mg 1/3 Nb 2/3 ) 4+ ions substituted ceramics. The addition of (Mg 1/3 Nb 2/3 ) 4+ ions enhances the bond energy in unit cell without changing the crystal structure of Li 2 MgTiO 4 , which results in high Q·f value as an intrinsic factor. The extrinsic factors such as porosity and grain size influence the dielectric loss at lower sintering temperature , while the oxygen vacancies play dominant role when the ceramics densified at 1400 °C. The Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 ceramics sintered at 1400 °C can achieve an excellent combination of microwave dielectric properties : ε r = 16.19, Q·f = 160,000 GHz and τ f = −3.14 ppm/°C. In addition, a certain amount of LiF can effectively lower the sintering temperature of the matrix, and the Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 -3 wt% LiF ceramics sintered at 1100 °C possess balanced properties with ε r = 16.32, Q·f = 145,384 GHz and τ f = −16.33 ppm/°C.
研究领域:
材料科学
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电子材料
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Liuyi Hu,Tianqi Yang,Xiang Yan,Yaning Liu,Wenkui Zhang,Jun Zhang,Yang Xia,Yao Wang,Yongping Gan,Xinping He,Xinhui Xia,Ruyi Fang,Xinyong Tao,Hui Huang
All-solid-state lithium–sulfur batteries (ASSLSBs) have attracted wide attention due to their ultrahigh theoretical energy density and the ability of completely avoiding the shuttle effect. However, the further development of ASSLSBs is limited by the poor kinetic properties of the solid electrode interface. It remains a great challenge to achieve good kinetic properties, by common strategies to substitute sulfur–transition metal and organosulfur composites for sulfur without reducing the specific capacity of ASSLSBs. In this study, a sulfur–(Ketjen Black)–(bistrifluoromethanesulfonimide lithium salt) (S-KB-LiTFSI) composite is constructed by introducing LiTFSI into the S-KB composite. The initial discharge capacity reaches up to 1483 mA h g–1, benefited from the improved ionic conductivity and diffusion kinetics of the S-KB-LiTFSI composite, where numerous LiF interphases with a Li3N component are in situ formed during cycling. Combined with DFT calculations, it is found that the migration barriers of LiF and Li3N are much smaller than that of the Li6PS5Cl solid electrolyte. The fast ionic conductors of LiF and Li3N not only enhance the Li+ transfer efficiency but also improve the interfacial stability. Therefore, the assembled ASSLSBs operate stably for 600 cycles at 200 mA g–1, and this study provides an effective strategy for the further development of ASSLSBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yunchao Liao,Na Wang,Xinyi Dai,Wenwen Zhou,Fuzhong Wu,Jiexi Wang,Haijun Chen,Yi Mai
Ultrahigh-nickel LiNi x Co y Mn 1-x-y O 2 cathode material (Ni content ≥ 0.9) is of great significance for the development of high energy density of lithium-ion batteries. However, its high surface activity leads to more surface residual lithium formation and deterioration of electrochemical performance, especially at high voltage. Here we add NH 4 F and nitrogen-doped carbon nanotubes (CNT) during the dimethyl carbonate (DMC) washing process, and constructed in situ the nano-LiF and CNT composite cathode electrolyte interphase (CEI) layer while removing part of residual lithium, effectively optimizing the surface environment of LiNi 0.9 Co 0.05 Mn 0.05 O 2 . The modified LiNi 0.9 Co 0.05 Mn 0.05 O 2 has a capacity retention rate of 61.3 % after 200 cycles between 2.8 and 4.5 V at 1C, significantly higher than the 46.7 % of the unwashed sample, and a specific discharge capacity of 146.9 mAh g −1 at 5C, compared to 127.5 mAh g −1 for the unwashed sample. Benefit from the alleviation of polarization and the increase of Li + diffusion coefficient, the stable CEI layer provides effective protection for LiNi 0.9 Co 0.05 Mn 0.05 O 2 under 4.5 V, alleviating surface side reactions. In this paper, a simple and effective strategy is developed to optimize the surface of Ni-rich cathode material, which provides a new insight for the treatment of surface residual lithium.
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 Materials Chemistry A
·
2025
·
IF 9.5
Xiaoyu Tang,Miao Bai,Ahu Shao,Zhiqiao Wang,Helin Wang,Min Zhang,Yue Ma
Prelithiation is key to extending the lifespan of anode-free lithium-metal batteries (AFLMBs) by compensating for irreversible lithium loss. However, current prelithiation agents suffer from poor processability and sensitivity to temperature and humidity, limiting their use in conventional manufacturing. In this study, we introduce a novel high-prelithiation-capacity (~ 720 mAh g-1), ambient environment stable LiF/carbon nanocomposite as the sacrificial agent, specifically designed to stabilize high-energy, ampere-hour-level anode-free lithium-metal batteries. The nanocomposite's design, with LiF nanodots embedded in a carbon matrix, balances high lithium retrievability with compatibility with existing battery manufacturing processes. Additionally, the carbon matrix facilitates the delithiation process of the LiF nanocrystals. In an Ah-level anode free pouch cell (LiNi1.5Mn0.5O4 cathode paired with bare Cu foils) the nanocomposite enabled an energy density of 278.2 Wh kg-1 energy density and 66.9% capacity retention after 200 cycles. Operando transmission-mode X-ray diffraction tracking reveals the lithium-supplementation process of the LiF/C agent, as well as enhanced reversibility of the phase transition during cycling. These findings suggest that the nanocomposite is a promising material for energy-dense, anode-free cell development.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Yaning Liu,Shengwei Yin,Liuyi Hu,Ruojian Ma,Min Fan,Meiqing Feng,Ruyi Fang,Zhen Xiao,Jun Zhang,Yongping Gan,Hui Huang,Xinping He,Xinhui Xia,Yanxian Jin,Xinyong Tao,Wenkui Zhang,Yang Xia
The interfacial failure of solid polymer electrolytes (SPEs) with Li anode, particularly those containing succinonitrile (SN) types, has significantly hindered the practical development of solid-state lithium-metal batteries. Herein, we introduce silicified montmorillonite (SiO 2 -MMT) into polyethylene oxide (PEO)/SN-based SPEs to facilitate the in-situ formation of a LiF-rich phase, thereby significantly enhancing the electrolyte/Li anode interface stability. Specifically, the SiO 2 -MMT strongly anchors the SN molecules, preventing their migration to the Li anode side. Meanwhile, the TFSI − reacts competitively with Li to generate a dense LiF phase, further blocking the SN chemical corrosion of Li metal. Furthermore, the SiO 2 -MMT greatly accelerates the Li + transportability and enhances the thermal stability and mechanical strength of the composite electrolyte. Consequently, the composite electrolyte has a high ionic conductivity of 1.2 × 10 −4 S cm −1 at 30 °C, which almost twice as higher as the counterpart. As for the solid-state battery, the LiFePO 4 ||Li cell demonstrates remarkable cycling stability, achieving a high discharge capacity of 141.7 mA h g −1 with a remarkable capacity retention of 90.2 % after 350 cycles at 0.5 C. Additionally, the high electrochemical window (4.6 V) ensures compatibility with high-voltage cathode materials. The NCM83||Li cell demonstrates a satisfactory initial discharge capacity and excellent capacity retention of 179.2 mA h g −1 and 81.8 % at 0.2 C after 100 cycles. This work offers a new insight for achieving a highly stable electrolyte/Li anode interface in SN-containing SPEs, facilitating the practical application of solid-state lithium metal batteries with enhanced safety and lifespan.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Zhengfeng Wang,Xinyi Dai,Haijun Chen,Fuzhong Wu,Yi Mai,Shuie Li,Yijing Gu,Jingze Li,Aijun Zhou
The surface and interface stability of the electrode is an important factor affecting the electrochemical performance of the battery, and surface modification is an effective means to stabilize the electrode surface interface. In this paper, a TiO2–LiF composite coating layer with very stable chemical properties on the LiCoO2 (LCO) surface is prepared in one step. At the same time, surface doping is realized, which provided a stable surface structure for LCO and stabilized the interface between the electrode and electrolyte. Electrochemical test results show that in the range of 3–4.5 V, the capacity retention rate of the sample with a coating amount of 1% is 97.4% after 110 cycles at 0.2 C and a discharge capacity of 151.5 mAh g–1 at 5 C, while the bare electrode is only 67% (110th cycle) and 50.7 mAh g–1 under the same conditions. Even at 0.5 C within 3–4.6 V, the capacity retention rate of the coated sample is still as high as 88.6% after 100 cycles, showing excellent high-voltage cycle stability. Studies such as cyclic voltammetry and electrochemical impedance spectroscopy show that the improvement in electrochemical performance is due to the coating layer effectively stabilizing the LCO surface composition and structure, alleviating the structural degradation of LCO, and optimizing the lithium-ion transport channel.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bingjing Tao,Weifeng Wang,Huanyu Liu,Tianxiu Du,Haitao Wu,Chunfang Xing,Dongzhi Wang,Yuping Zhang
Li 4 Mg 3 [Ti 0 · 6 (Mg 1/3 Nb 2/3 ) 0.4 ] 2 O 9 (LMT 0.6 (MN) 0.4 O) ceramics doped with 1–5 wt% lithium fluoride (LiF) were prepared through a conventional solid-state reaction at a relatively low sintering temperature . The influences of the LiF additive on the micromorphology, crystal phase composition, and sintering behavior, as well as the microwave dielectric properties of the LMT 0.6 (MN) 0.4 O ceramics were explored in depth. The addition of the LiF sintering additive reduced the densification temperature of the LMT 0.6 (MN) 0.4 O ceramics from 1450 °C–950 °C. X-ray powder diffractometer patterns indicated that a single phase formed for all experimental samples. Scanning electron microscopy photographs revealed that dense and homogeneous microstructures were obtained at 950 °C for the LMT 0.6 (MN) 0.4 O ceramics with 3–5 wt% LiF. Additionally, the optimized microwave dielectric properties, including ε r = 16.24, Q·f = 107,828 GHz (at 8.13 GHz), and τ f = −6.25 ppm/°C were achieved in the prepared LMT 0.6 (MN) 0.4 O ceramics with 4 wt% LiF at the sintering temperature of 950 °C. Furthermore, the excellent chemical compatibility between this component and silver were confirmed based on the results of XRD and EDS analyses, suggesting that the LMT 0.6 (MN) 0.4 O ceramics with 4 wt% LiF could be a suitable material for the application of low temperature co-fired ceramics.
研究领域:
材料科学
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陶瓷
·
微波工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaodong Zhu,Fantao Kong,Xinsheng Ma
Li-added CaO-B 2 O 3 -SiO 2 (CBS) dielectric microwave substrates for low temperature co-fired ceramic (LTCC) applications were prepared using a solid-state reaction, and the effect of the LiF additive on the sintering behavior, dielectric performance and mechanical properties of the product was investigated. In this presently reported work, we found that the LiF additive could effectually reduce the sintering temperature of the CBS ceramics and also substantially improved the densification, dielectric and mechanical properties of it. The experimental results showed that an addition of 3 wt% LiF to the sample sintered at 790 °C resulted in a main crystalline phase of β-CaSiO3 which had excellent proprieties. These included an excellent degree of densification, ε r of 6.43, tan δ of 5.9 × 10 −4 and a volume resistivity of 8.20 × 10 11 Ω cm at 1 MHz, and flexural strength of 241 MPa.
研究领域:
材料科学
·
电子工程
✓ 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）