Chemical Science
·
2023
·Vol. 14
·期 44
·12570-12581
·
IF 8.4
Mingli Xu,Fengxue Zhang,Yanhui Zhang,Chen Wu,Xue Zhou,Xinping Ai,Jiangfeng Qian
Exploring a sodium-enriched cathode (i.e. Na4V2(PO4)3, which differs from its traditional stoichiometric counterpart Na3V2(PO4)3 that can provide extra endogenous sodium reserves to mitigate the irreversible capacity loss of the anode material (i.e. hard carbon), is an intriguing presodiation method for the development of high energy sodium-ion batteries. To meet this challenge, herein, we first propose a redox-potential-matched chemical sodiation approach, utilizing phenazine-sodium (PNZ-Na) as the optimal reagent to sodiate the Na3V2(PO4)3 precursor into Na-enriched Na4V2(PO4)3. The spontaneous sodiation reaction enables a fast reduction of one-half V ions from V3+ to V2+, followed by the insertion of one Na+ ion into the NASICON framework, which only takes 90 s to obtain the phase-pure Na4V2(PO4)3 product. When paired with a hard carbon anode, the resulting Na4VP‖HC full cell exhibits a high energy density of 251 W h kg−1, which is 58% higher than that of 159 W h kg−1 for the Na3VP‖HC control cell. Our chemical sodiation methodology provides an innovative approach for designing sodium-rich cathode materials and could serve as an impetus to the development of advanced sodium-ion batteries.
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
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 7
·1-10
·
IF 2.5
Chen Wanhao,Shen Xiaowei,Huan Yunfei,Yan Chenglin,Qian Tao,Liu Xuejun
The potential application of anode-less sodium metal batteries (ALSBs) is severely affected by the irreversible depletion of sodium ions. Cathode sodium compensation (SC) additive is an effective way for sodium supplement due to its simplicity and flexibility. However, developing SC additives with no toxicity, low cost, low sensitivity to air and humidity is still a huge challenge. In this work, we propose a low-cost, environmentally friendly and air-stable organic sodium salt as sodium reservoir to compensate sodium ion, thus improving the cycle stability of ALSBs. The capacity of ALSBs with N: P as low as 0.5:1 could maintain capacity retention of 91.3% after 100 cycles with this SC additive, while the cell without this SC additive would decline to almost zero after 10 cycles. The inexpensive price and ease of preparation also make it suitable for industrialization. This work provides a realistic SC approach for improving the cycling stability for ALSBs.
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 CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Zhanglei Zhu,Bohui Zhao,Jin Wang,Yiming Zhu,Qiuyue Sheng,Zhen Li,Ningning Zhang,Wei Yu
High-ash fine slime has an adverse effect on coal flotation. In this study, the roles of sodium silicate (SS) and sodium carbonate (SC) in the facilitating effect on lean coal flotation (a type of coking coal) were studied when sodium oleate (NaOL) was used as a collector through flotation tests, Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) observations, turbidity measurements, and particle interaction energy calculations. The flotation tests found that SS has a stronger capacity than SC for the improvement of flotation performance of lean coal. Moreover, SEM-EDS observations and turbidity measurements showed that SS presents a stronger weakening effect for the coating of high-ash fine slime on the surface of low-ash coal particles than SC. Furthermore, the particle interaction energy calculations verified that the increase in the energy barrier for the attachment between low-ash coal particle and high-ash fine slime caused by SS is larger than SC, providing theoretical supports for the experiments. Compared to kerosene as a collector, based on the similar ash content, the yield of clean coal increases greatly with the synergistic effect of SS and NaOL. In summary, SS is an appropriate dispersant for lean coal flotation in sodium oleate system.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2022
·Vol. 59
·期 3
·221-230
·
IF 1.058
Fengli Gong,Hong Xu,Jinxiang Dong
Sodium oxalate (Na 2 C 2 O 4 ) is an excellent phosphorus-free agent, but in sodium oxalate-containing detergents with sodium dodecylbenzene sulfonate (SDBS) and sodium carboxymethyl cellulose (CMC), significant ash deposition occurs on cotton fabrics. SDBS is the main anionic surfactant in modern detergents and cotton fiber is the most commonly used textile fiber. In this study, sodium lignosulfonate (LS) was investigated for its ability to prevent redeposition in SDBS-Na 2 C 2 O 4 -CMC-LS formulations. The effects of LS on ash content, whiteness, optimum washing temperature, calcium oxalate morphology, zeta potential and surface tension were carefully analyzed. The results showed that the addition of LS significantly improved the prevention of ash deposits on cotton fibers. The ash content was less than 0.46% and a small amount of particles were scattered on the cotton fibers. LS showed good dispersibility but had little effect on the washing power and zeta-potential.
研究领域:
材料科学
·
纺织工程
·
表面化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tinghu Liu,Lin Shen,Yunming Li,Kemin Jiang,Libo Song,Yuming Jin,Jing Yang,Xing Xin,Xiayin Yao
NASICON oxide solid electrolytes are considered promising candidates for all-solid-state sodium batteries due to their extremely high ionic conductivity and favorable electrochemical stability. However, the practical application of NASICON electrolytes is greatly impeded by poor electrolyte–electrode interfacial contact and continuous sodium dendrite propagation. Herein, a NaF-rich multifunctional interface layer on the surface of a Na anode (Na@NaF-rich), containing NaF, amorphous carbon, and an unreacted C–F bond species, is developed in situ by the reaction between Na and commercial poly(tetrafluoroethylene). This NaF-rich interface layer is proven to reduce the diffusion barriers at the Na/NASICON electrolyte interface and homogenize Na deposition as well as suppress Na dendrite growth, thus achieving a high critical current density of 4 mA cm–2. The resultant Na3V2(PO4)3@C/Na@NaF-rich all-solid-state cell showed a high initial specific capacity of 117.6 mAh g–1 at 0.1 C with a Coulombic efficiency of 94.8%. Even at 0.5 and 1 C, it still exhibited high capacity retentions of 83.3% and 80.4%, respectively, after 750 cycles.
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
Advanced Energy Materials
·
2024
·Vol. 14
·期 13
·2303871
·
IF 24.4
Yuzhuo Zeng,Weijing Bai,Jianhui Zhu,Maowen Xu,Jian Jiang
Intrinsically weak metal affinity and sluggish sodium (Na) nucleation/molten fluidic transport of conventional hosts impede the fabrication of high-capacity Na anodes. Mediating surface free energies (SFEs) of hosts and reinforcing their intermolecular attraction to viscous Na fluids can radically solve these problems. Herein, “canaled” tin oxide nanorod arrays grown on a 3D carbon cloth (CC) matrix exhibit distinct polar/nonpolar SFE components that markedly elevate the solid–liquid wettability for molten Na is reported. Such nanocanal defects render strong capillary forces for spontaneous molten Na imbibition and help to instantly activate Na─Sn alloying and Na nucleation reactions. Furthermore, sodiophilic Na 15 Sn 4 interlayers evolved in former alloying procedures also aid in reducing Na nucleation energy barriers and guide the planar electro-deposition/dispersion, alleviating the uncontrolled Na dendrite growth. The derived Na/Na 15 Sn 4 /CC anodes can thus keep stable after 2000 h of galvanostatic cycling at 1 mA cm −2 or high-rate testing, without notable dendritic formation. The packed full cells also show superior rate capability and cyclability (capacity retention over 91.5% after all cycling at 1 C). This work provides a smart nano-engineering way to trigger a fast infusion of molten metals into hosts and synergistically facilitate Na fluidic transport, which may push forward the scalable application of Na metal batteries.
研究领域:
材料科学
·
电化学
·
纳米工程
·
能源存储
·
金属电池
·
界面化学
·
先进功能材料
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Wenbo Li,Runnan Guo,Yanjun Li,Zhenhai Dong
In this study, we developed a new method for the efficient extraction and separation of V from direct acid leaching solutions of weathered crust V Ti magnetite using N235/TBP, sodium sulfate (Na 2 SO 4 ), and sodium carbonate (Na 2 CO 3 ) as the extraction system and washing and stripping agents, respectively. The effects of various experimental conditions on the extraction results were investigated, and the extraction efficiency of V was approximately 70% with <4% Fe co-extraction under optimal conditions. A four-stage countercurrent extraction method was used to extract >96% of V and <4.5% of Fe, and the separation factor of V/Fe was 541. Upon washing the V-loaded organic phase with a 0.70 mol/L Na 2 SO 4 solution, >96% of Fe and ~1% of V were removed. Moreover, upon stripping the purified organic phase with a 0.70 mol/L Na 2 CO 3 solution, >98% of V was recovered. The effects of other impurities on the separation of V were negligible. Moreover, the stripped organic phase can be recycled sustainably during extraction. In this study, we selectively separated V and provided a new method for accelerating the purification and enrichment of V, which is present at low concentrations in acid leaching solutions.
研究领域:
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Yang Liu,Yan Wang,Wangfeng Cai
In this work, the salting effect of sodium hydroxide (NaOH) and sodium formate (HCOONa) on the liquid–liquid equilibrium (LLE) of polyoxymethylene dimethyl ethers (DMMn) in aqueous solution was studied. The LLE data of the systems (DMM1 + water) and (DMM2 + water) and the system (DMM1 + water + DMM2) under different concentrations of NaOH and HCOONa at 293.15 and 308.15 K were measured. According to the verification with the Marcilla-modified Eisen–Joffe equation, the experimental data has a good consistency. Distribution coefficients were calculated and compared, and the results showed that NaOH and HCOONa have a significant salting-out effect on DMMn and water separation. Based on the experimental LLE data, the original nonrandom two liquid (NRTL) and the electrolyte NRTL activity coefficient models were correlated by the maximum-likelihood principle, which showed that the electrolyte NRTL model was more appropriate. The experimental data and the binary interaction parameters could provide a useful reference for DMMn product reaction extraction before rectification.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Tao Huang,Rongrong Zheng,Haiyang Chang,Di Ma,Haijun Niu
Organic electrode material can be obtained from biomass through green process, so it is a sustainable green electrode material. However, the capacity attenuation problem of organic electrode seriously affects its application in the field of batteries . Desodiation state and sodiation state are the two corresponding states of electrode materials in redox reaction . The reason for this problem is that the reported desodiation state or sodiation state of organic electrode active unit cannot exist stably in aprotic electrolyte. Here, we report a new organic active unit sodium tert-butoxide (STB), which can exist stably in aprotic electrolyte to obtain high cycle stability. As the electrode of rechargeable batteries, the STB exhibits a capacity of 206 mAhg −1 at 35 mAg −1 , 2.4 V. The battery runs more than 5000 cycles at 210 mAg −1 , 135 mAhg −1 , no capacity attenuation. The other two battery samples run more than 6500 cycles and 10000 cycles at 600 mAg −1 , with the capacity retention 99% and 98%, respectively. STB provides a design basis for the development of organic electrode materials with high energy density and high cycle stability.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 315
·期 3
·581-593
·
IF 1.181
Jie Fengping,Bai Zhishan,Yang Xiaoyong
A microemulsion consisting of sodium laurate, n -pentanol, n -heptane and NaCl solution was investigated for Co(II) extraction. The dilution method and conductivity method were used for the determination of structural parameters of sodium laurate/pentan-1-ol/heptane/NaCl microemulsion system. Co(II) was found to be extracted into the microemulsion phase due to the compound formation of [CoCl] + [R 11 COO] − , which was confirmed by the continuous variation of R 11 COONa concentration. Moreover, the effects of cosurfactant, the contact time, the phase ratios, PH and the NaCl concentration in feed solutions on the cobalt extraction yield were investigated. Under the optimum conditions, the extraction percentage of Co(II) could reach 98.9%.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Xueying Zheng,Wenjuan Yang,Zhongqiang Wang,Liqiang Huang,Sheng Geng,Jiayun Wen,Wei Luo,Yunhui Huang
The high theoretical capacity and earth-abundancy of metallic sodium (Na) endow it with high potential as the ultimate anode for batteries based on Na-ion chemistry. Nevertheless, dendritic Na, the unstable solid electrolyte interphase (SEI) and an infinite volume change of Na metal, drive rapid cell deterioration and potential safety hazards. In tackling these challenges, we take advantage of the spontaneous reaction between molten Na and SnO 2 that triggers the formation of a percolated Na–Sn alloy/Na 2 O framework throughout Na metal, effectively anchoring the “hostless” Na into a dual ion/electron-conductive matrix and simultaneously improving the electrode surface chemistry. By density functional theory (DFT) calculations, we validate the high “sodiophilicity” and low Na + diffusion barrier enabled by the Na–Sn alloy/Na 2 O framework. As such, stable Na plating/striping is realized in symmetric cells using both carbonate and ether-based electrolytes without any additive. The full cell paired with Na 3 V 2 (PO 4 ) 3 cathode further demonstrates superior capacity retention of 83% over 300 cycles (1C), along with a promising rate performance at 10C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）