ACS Applied Energy Materials
·
2023
·
IF 6.4
Haoyang Zhao,Jun Zhang,Tianqi Yang,Zheyu Jin,Xinping He,Zhongwei Wang,Yang Xia,Yao Wang,Xinyong Tao,Wenkui Zhang
Aqueous lithium-ion batteries (ALIBs) are attracting intense attention because of the intrinsic nonflammable nature of the aqueous electrolytes. However, its own narrow electrochemical window has led to numerous problems such as dissolution of electrode materials, hydrogen evolution at the anode, and poor cycling stability. Here, we report an “overcrowded electrolyte” using 1,4-dioxane as an additive, which has lone pairs of electrons on the oxygen atom to disrupt the original water-hydrogen bonding network by forming intermolecular hydrogen bonds, thereby inhibiting the hydrogen evolution reaction (HER) and decreasing the water activity. Furthermore, a layer of crystalline Li2CO3 is coated onto the surface of the TiNb2O7 anode material by supercritical fluid CO2 technology. The dense hydrophobic Li2CO3 coating layer can serve as a physical protection, which effectively blocks the direct contact between electrolyte and electrode. Under the synergistic effect of those two aspects, HER is greatly suppressed and the interface stability is enhanced. As a result, LiMn2O4/TiNb2O7 full cells exhibit a high initial coulomb efficiency of 95% with a capacity retention rate of 92% over 500 cycles under 1 C rate. This work provides a fundamental understanding of the interfacial chemistry of ALIBs and makes an important step forward in the development of high-performance and low-cost ALIBs for practical applications.
研究领域:
电化学
·
材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yuansong Luo,Han Gao,Xiujian Zhao
The NASICON-type Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) is considered to be one of the most promising solid electrolytes because of its excellent chemical stability against moisture and considerable total ionic conductivity . Nevertheless, the poor sinterability and low grain boundary ionic conductivity of LATP limit its practical commercial applications. Herein, Li 2 CO 3 ·Bi 2 O 3 (abbreviated as LB), as a sintering aid, was introduced into LATP to improve its sinterability and ionic conductivity. It was demonstrated that the addition of LB promoted the liquid phase sintering of LATP by forming the secondary phases with a low melting point, thereby promoting the growth of grains and making the contact between the grains closer. With the help of LB, the sintering temperature of LATP was reduced to about 900 °C. A series of comparative investigations indicated that the LATP-2LB ceramic pellets sintered at 900 °C exhibited the highest total ionic conductivity of 0.673 mS/cm. Meanwhile, the relative density and grain boundary ionic conductivity of LATP-2LB ceramic pellets sintered at 900 °C reached 95.28% and 3.835 mS/cm, respectively, which is much higher than 77.16% and 0.264 mS/cm of LATP-0LB ceramic pellets sintered at the same temperature. Obviously, LB can effectively improve the sinterability of LATP while increasing its ionic conductivity, providing a new strategy for preparing LATP ceramics with excellent properties.
研究领域:
材料科学
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电化学
·
固体化学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Zihao Wang,Sisi Liang,Chenyang Zhan,Kunyuan Xu,Jie Hu,Dejian Chen,Liping Song,Haomiao Zhu
Full-spectrum phosphor-converted white-light-emitting diodes (pc-WLED) are emerging as a mainstream technology in semiconductor lighting. Nevertheless, high-performance blue phosphor which can be excited efficiently by a 400 nm NUV diode chip is still lacking. Herein, we present a blue-emitting Na 3 KMg 7 (PO 4 ) 6 :Eu 2+ phosphor synthesized by the solid-reaction method. Particularly, we find that the using of Li 2 CO 3 as flux can significantly improve the crystal quality and thus the emission efficiency of the phosphor. Meanwhile, the excitation peak of the phosphor shifts from 365 to 400 nm, which is pivotal for efficient NUV (400 nm) diode chip excitation. The practical Eu 2+ concentration is also enhanced by using Li 2 CO 3 as flux, and the absorption efficiency is greatly increased. This phosphor exhibits superior PL thermal stability, namely retains 94% integrated photoluminescence intensity at 150 °C of that at 25 °C. As a result, the optimized phosphor shows an emission band peaked at 437 nm with a bandwidth of 40 nm and a high external photoluminescence quantum yield of 51.7%. Finally, a pc-WLED was fabricated by using NKMPO:Eu 2+ blue, Sr 2 SiO 4 :Eu 2+ green, CaAlSiN 3 :Eu 2+ red phosphors, and a 400 nm NUV diode chip. It shows a high color rendering index of R a = 96.4 and a correlated color temperature of 4358 K. These results prove that NKMPO:Eu 2+ is a promising blue phosphor for full-spectrum WLED based on NUV diode chips.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Jing Zhang,Peiqi Shen,Yuchun Liu,Tianchen Wei,Xingwu Zhai,Baichuan Zhu,Jianrong Zeng,Kun Xu,Min Zhou
Lithium carbonate, the primary discharge product in Li–CO 2 batteries with high thermodynamic stability and a wide band gap, leads to significant electrochemical inertness, limiting efficiency and cycle life. The strongly delocalized p z orbital at a lower-energy HOMO level in Li 2 CO 3 causes weak coupling with the O-p z orbitals, increasing decomposition resistance owing to d-orbital degeneracy in high-local-symmetry catalysts. This study introduces metastable tetragonal-pyramidal nickel sulfide (tp-NiS) with low-symmetry NiS 5 coordination, breaking d-orbital degeneracy and bringing d z 2 , d xz , and d yz orbitals closer to the Fermi level. Enhanced orbital overlap with Li 2 CO 3 O-p z orbitals facilitates robust Ni–O bond formation. In situ spectroscopy confirms reversible Ni–O bond formation during cycling, ensuring electron transfer and complete Li 2 CO 3 decomposition. Conversely, weak interfacial interactions in octahedral NiS with highly symmetric local coordination only allow decomposition-resistant Li 2 CO 3 and interface passivation. Consequently, tp-NiS exhibits superior electrochemical performance, with the best reported reversibility and stability, a charge potential below 4.0 V, and 92.03% capacity retention after 1800 h. This metal redox-driven mechanism establishes a reversible geometric conversion pathway, emphasizing the critical role of symmetry-engineered Ni–O interactions in bifunctional catalysts.
研究领域:
电化学
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材料科学
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储能
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催化
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电池技术
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产品关联
DOI
PubMed
高影响因子
Energies
·
2022
·Vol. 15
·期 9
·3206
·
IF 3.252
Li Huang,Jian Gao,Zhijie Bi,Ning Zhao,Jipeng Wu,Qiu Fang,Xuefeng Wang,Yong Wan,Xiangxin Guo
The cubic garnet Li7La3Zr2O12(c-LLZO) is one of the most promising solid electrolytes due to its high ionic conductivity and large electrochemical window. However, the critical issue of Li2CO3formation on the c-LLZO surface when exposed to air is problematic, which is detrimental to the ionic conductivity and storage. Herein, comparative studies were carried out on the air stability of Al-doped Li7La3Zr2O12(Al-LLZO), Al-Ta-doped Li7La3Zr2O12(Al-LLZTO), and Al-Nb-doped Li7La3Zr2O12(Al-LLZNO). It was found that Al-LLZTO and Al-LLZNO are less reactive with air than Al-LLZO. The morphology of Li2CO3on Al-LLZTO micro-sized powders after air exposure was island-like with ~1.5 μm in thickness. The interfacial resistance of Li/Al-LLZTO was also a factor of ~3 smaller than that of Li/Al-LLZO, leading to the improved cycle stability of Li/Al-LLZTO/Li symmetric cells. The first-principles calculations based on density functional theory (DFT) verified that the decomposition energy of Al-LLZTO was larger than that of Al-LLZO, inhibiting the reaction product of Li2O and, thus, the next step product of Li2CO3following the reactions of Li2O + H2O → LiOH and LiOH + CO2→ Li2CO3.
研究领域:
材料科学
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电化学
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计算化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Zhen Wang,Jun-Ke Liu,Li Deng,Jian Liu,Zhi-Liang Jin,Yu-Xi Luo,Guo-Dong Bai,Wen-Jing Sun,Gao-Yang Bai,Jing-Yi Lin,Zu-Wei Yin,Yao Zhou,Jun-Tao Li
Extending the charging voltage of LiCoO 2 (LCO) is an ongoing and promising approach to increase its energy density. However, the main challenge of the approach lies in the insuperable cathodic interfacial processes at high voltage, which leads to rapid failure both in the performance and structure of the LCO cathode. Herein, a Li 2 CO 3 -based additive was prepared by a simple sand-milling method, enabling a low electrochemical decomposition voltage <4.6 V from commonly >4.8 V, stabilizing the interface of the LCO cathode at 4.6 V. The decomposition of Li 2 CO 3 provides extra Li + and CO 2 to supplement the Li consumption required in the initial irreversible interfacial reactions and rapidly form a uniform and stable cathode electrolyte interphase layer (less organic and more inorganic components) on the LCO cathode by reducing CO 2 . Thus, the phase transformation and the emergence of high-valent Co ions on the surface of LCO at 4.6 V high voltage were inhibited. Thanks to this, with 2% Li 2 CO 3 -based additive, the capacity retention of commercial LCO at a high voltage of 4.6 V at 0.5 C for 100 cycles was improved from 59.3% to 79.3%. This work improves the high-voltage stability of LCO and provides a new idea for realizing the high-voltage operation of batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Zhongning Shi,Wentao Deng,Xiaowen Song,Xianwei Hu,Bingliang Gao,Zhaowen Wang
The solubility of carbon dioxide in a LiF–Li2CO3 molten salt system was determined using a pressure differential method. With increasing holding temperature, the solubility of CO2 in LiF–Li2CO3 melts decreases rapidly. The influence of the alkali metal fluoride of XF(X = K, Na) content from 5% to 25% on the CO2 solubility was considered. The CO2 solubility in LiF–Li2CO3–XF melts decreased with increasing temperature and concentration of XF. The calculated thermodynamic data for CO2 dissolved in these melts revealed that the reaction between CO2 and a carbonate ion was exothermic. At 630 °C, KF decreased the CO2 solubility more effectively than NaF. When the mole fraction of LiF was 50% in LiF–Li2CO3, the CO2 solubility reached a maximum of 6.8 × 10–4 (molCO2/molmelt) at 640 °C.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chun-xian Zhou,Peng-bo Wang,Bao Zhang,Lin-bo Tang,Hui Tong,Zhen-jiang He,Jun-chao Zheng
Li-rich cathode materials are regarded as ideal cathode materials, owing to their excellent electrochemical capacity. However, residual lithium compounds, which are formed on the surface of the materials by reacting with moisture and carbon dioxide in ambient atmosphere, can impair the surface structure, injure the capacity, and impede the electrode fabrication using Li-rich materials. Exposure to air atmosphere causes the formation of residual lithium compounds; the formation of such compounds is believed to be related to humidity, temperature, and time during handling and storage. In this study, we demonstrated for the first time an artificial strategy for controlling time, temperature, and humidity to accelerate exposure. The formation and effect of residual lithium compounds on Li-rich cathode material Li1.35[Ni0.35Mn0.65]O2 were systematically investigated. The residual lithium compounds formed possessed primarily an amorphous structure and were partially coated on the surface. These compounds include LiOH, Li2O, and Li2CO3. Li2CO3 is the major component in residual lithium compounds. The presence of residual lithium compounds on the material surface led to a high discharge capacity loss and large discharge voltage fading. Understanding the formation and suppressing the effect of residual lithium compounds will help prevent their unfavorable effects and improve the electrochemical performance.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shiyu Bie,Meili Du,Wenxiang He,Huigang Zhang,Zhentao Yu,Jianguo Liu,Meng Liu,Wuwei Yan,Liang Zhou,Zhigang Zou
Efficient electrocatalysts for Li2CO3 decomposition play an important role in Li–CO2 batteries. In this paper, carbon nanotubes (CNTs) decorated with RuO2 is firstly introduced as cathode materials for Li–CO2 batteries. The CNT@RuO2 composite can not only deliver a high specific capacity but also a lower charge voltage. With the CNT@RuO2 cathodes, the Coulombic efficiency still remains around 100% until the 15th cycle. The charge voltage of early 30 cycles at a current of 50 mA·g–1 with a capacity limit of 500 mAh·g–1 can be fully lowered under 4.0 V. Particularly, the CNT@RuO2 cathode can realize most decomposition of prefilled Li2CO3 and show a platform at around 3.9 V. This catalytic activity toward both in situ formed and preloaded Li2CO3 is more feasible for practical application in complex environment.
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
CRYSTENGCOMM
·
2024
·
IF 2.6
yufei Song,Xiaojie Guo,Wenxiang Mu,Xutang Tao,Zeliang Gao
β-Ga2O3 is an ultra-wide bandgap semiconductor with immense potential applications in high voltage, electronic devices, and deep-ultraviolet optoelectronic devices, etc. However, to date, the growth of bulk β-Ga2O3 crystals has predominantly utilized melt methods, which are heavily dependent on specific growth vessels. In this work, bulk crystal β-Ga2O3 with a size of 7 × 13 × 4 mm3 is grown using TeO2-Li2CO3 as flux by a top-seeded solution growth (TSSG) method for the first time. It is noteworthy that the saturation point of β-Ga2O3 in the flux has been reduced to 1023 K, significantly lower than its melting point of 2073 K. The resulting β-Ga2O3 crystal exhibits well-formed faces, predominantly the (010), (100), (01(-)1), and (11(-)1(-)) forms, which closely align with the ideal morphological predictions made by the Bravais-Friedel and Donnay-Harker methods.The full-width at half maximum (FWHM) of the rocking curves for the (010) oriented plane is determined to be 140.4″. This work provides a potential β-Ga2O3 crystal growth method with a little platinum loss at a low temperature.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yang-Hai Zheng,Wen-Hao Wang,Yun-Xue She,Yue-Lin Wang,Tong Shen,Sheng-Rong Guo,Yun Xue,Yong-De Yan
To address the disposal challenge of radioactive cellulose-based protective equipment (e.g., gloves) from nuclear power plants, this study evaluated the oxidation behavior of Sr-doped gloves via Molten Salt Oxidation (MSO) technology, comparing three molten salt systems (chloride, carbonate, nitrate). Key analysis focused on oxidation efficiency, residue characteristics, and Sr immobilization mechanisms. Experimental results identified the ternary eutectic carbonate system (Li₂CO₃-Na₂CO₃-K₂CO₃) as the optimal, featuring a low eutectic temperature (393 °C), high Destruction Removal Efficiency (DRE), high Capacity Reduction Efficiency (CRE), good thermal stability, and non-corrosiveness. Resource conservation and oxidation efficiency were balanced at a salt-to-waste mass ratio of 1:2. Sr showed two temperature-dependent effects: it accelerated cellulose degradation and decreased activation energy (from 98.194 kJ·mol −1 to 94.942 kJ·mol −1 ) at >450 °C, but it hindered oxidation at <400 °C (molten salt not totally molten). In order to achieve atomic-level immobilization, Sr first produced SrO at 400–450 °C. At ≥500 °C, a spontaneous reaction (Gibbs free energy <0) converted Sr into thermally stable SrCO₃ (decomposition Gibbs free energy >0), at 800 °C, the Sr interception rate reached 95.1%. This study confirmed MSO with the ternary carbonate system (1,2 ratio) achieves deep mineralization of organic matter in radioactive gloves while efficiently immobilizing Sr. It overcomes defects of traditional methods (incineration causing nuclide volatilization, vitrification consuming high energy, cement solidification having a high leaching rate), providing a safe, efficient, and eco-friendly solution for radioactive personal protective equipment disposal in nuclear power plants.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ningning Feng,Bingliang Wang,Zhuo Yu,Yuming Gu,Lili Xu,Jing Ma,Yonggang Wang,Yongyao Xia
Li–CO2 batteries have attracted worldwide attention because of their dual characteristics of high energy density and effective CO2 capture. However, the basic electrochemistry mechanism involved has been unclear, which is mainly confused by the complicated decomposition of organic electrolytes. Herein, water-in-salt (WIS, LiTFSI/H2O 21.0 mol/1 kg) has been explored as a suitable electrolyte for the first time to investigate the reaction mechanism of Li–CO2 batteries with different cathodes (carbon nanotube (CNT) and Mo2C/CNT, respectively). An Mo2C-based Li–CO2 battery with WIS delivers a higher energy efficiency of 83% and a superior cyclability, compared to those of the CNT-based counterpart cell. Through various ex/in situ qualitative/quantitative characterizations, the Mo2C-based Li–CO2 battery with WIS can operate on the reversible conversion of CO2-to-Li2C2O4 ((e–/CO2)ideal = 1) at lower discharge/charge overpotentials, while the CNT-based counterpart cell is based on the formation/decomposition of Li2CO3 ((e–/CO2)ideal ≈ 1.33) at high overpotentials. Such a difference in CO2 reduction products stems from the stronger interaction between Mo2C(101) and Li2C2O4 than that of the CNT and Li2C2O4 based on the density functional theory calculations, resulting in the selective stabilization of the intermediate product Li2C2O4 on the Mo2C surface.
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
危险品化学品经营许可证（带存储）