CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qibing Wu,Xufeng Wang,Yuan Qin,Bin Shi,Bin Xiang,Xuefeng Zou
Due to its high voltage, high capacity, and high thermal stability, NiCl 2 is considered one of the best choices for cathode materials in high-power, high-capacity thermal batteries. However, its characteristic of being easily miscible with electrolytes at high temperatures poses a huge challenge to its application. This work proposed a simple, scalable strategy through using a commercial porous MgO (PMO) as absorber and buffer layer as well as an industrial-grade multilayer graphene (MLG) as conductive agent to manage the mutual solubility process and improve the electronic conductivity. Research finds that owing to strong coupling between components, the introduction of PMO and MLG can greatly improve the electrochemical stability of NiCl 2 , resulting in excellent thermal battery performance. When the content of PMO introduced is 8 wt%, the specific capacity of Li-B|EG|N-2 battery is 285.3 mA h/g (cut-off voltage at 2.0 V) at a current density of 200 mA cm −2 , almost 3.8 times than that of the pure NiCl 2 (only 73.4 mA h/g). When the current density is 500 mA cm −2 , its specific capacity can still reach 278.3 mA h/g. Meanwhile, its peak voltage reaches 2.461 V, while that of the pure NiCl 2 battery is only 2.38 V. Especially, it exhibits high initial voltage and continuous stable voltage output. Therefore, this work provides a feasible approach for the industrial preparation of highly stable NiCl 2 -based cathodes with excellent thermal battery performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2020
·Vol. 64
·期 1
·91-97
·
IF 2.302
Cao Yong,Li Jian,Yang Peng,Wei KaiYuan,Ma ShiPing,Zhang XiaoQiang,Wu MeiFen,Liu XiaoJiang,Cui YanHua,Wen ZhaoYin
NiCl 2 with high theoretical voltage and thermal decomposition temperature attracts much attention as cathode material for thermal batteries with the requirement of high power density, high energy density and long work time. Unfortunately, the practical utilization of thermal batteries with NiCl 2 cathode is limited by their poor electrochemical performance under large current, even with the conventional LiF-LiCl-LiBr all-lithium molten salt electrolyte which proposes ultrahigh lithium ion conductivity. In this work, an unexpected ionic exchange reaction between NiCl 2 and LiBr in LiF-LiCl-LiBr was found, which would be the main reason for the poor electrochemical behavior of thermal batteries with NiCl 2 cathode and LiF-LiCl-LiBr molten salt. On this basis, LiF-LiCl-Li 2 SO 4 , another all-lithium molten salt free of LiBr, was investigated as the new electrolyte for NiCl 2 cathode. For the single cell of Li(Si)/LiF-LiCl-Li 2 SO 4 /NiCl 2 , a discharge capacity of 377 mA h g −1 (with a cut-off voltage of 1.2 V) was achieved with large current density (500 mA cm −2 ) applied at 520°C, which is almost twice of that of Li(Si)/LiF-LiCl-LiBr/NiCl 2 (190 mA h g −1 ) at the same conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Ao,Zhaoyin Wen,Xiangwei Wu,Tian Wu,Meifen Wu
The role of the Ni3S2 layer on Ni particles in the electrochemical performance of Na/NiCl2 cells with the addition of sulfur into the cathode is studied. It was found that the Ni3S2 layer could be in situ generated on nickel particles and exhibit a self-repairing function during cycling when sulfur exists in the cathode due to the reaction between the sulfur and nickel particles. The self-repairing function of the Ni3S2 layer could enhance the blocking effect and improve the battery cycle performance. The capacity of the cell with the optimum amount of sulfur (with self-repairing function) after 50 cycles is about 12% greater than that of the cell with the optimum level of Ni3S2 (without self-repairing function). The effect of the self-repairing function of the Ni3S2 layer is determined by the amount of sulfur in the cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Yanjuan Zhang,Yadong Ning,Caixia Lv,Zhihui Yu,Yu Wang,Guangye Wei,Jingkui Qu
For efficient nickel recovery from laterite nickel ore, an improved understanding of the solubility in ternary MgCl2–NiCl2–H2O systems is required. Herein, the stable phase equilibria in a ternary MgCl2–NiCl2–H2O system at 303, 313, and 323 K were studied using an isothermal dissolution equilibrium method. For this ternary system, the solubility and density were measured at different temperatures. The equilibrium solid phases were identified using X-ray diffraction, combined with the Schreinemakers’ method for wet residues. Based on the solubility data, the phase diagrams of the MgCl2–NiCl2–H2O system at 303, 313, and 323 K were plotted. At all investigated temperatures, the phase diagrams of this ternary system presented an invariant point, two isothermal dissolution curves, and three crystallization regions. Neither double salt nor solid solution was produced. The Mixed Solvent Electrolyte (MSE) model was applied to calculate the solubility for this ternary system. According to the comparison of phase diagram, the calculated data were in good agreement with the experimental values.
研究领域:
化学工程
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yanpei Li,Lei Shi,Xingpeng Gao,Jingyi Wang,Yingying Hu,Xiangwei Wu,Zhaoyin Wen
The hierarchical nickel chloride/reduced graphene oxide (NiCl 2 -rGO) aerogels are synthesized via a facile hydrothermal and freeze-drying methods using low-cost nickel chloride hexahydrate (NiCl 2 ·6H 2 O) as raw material. The NiCl 2 -rGO hybrid aerogel structure enables the uniform distribution of lamellar NiCl 2 on the three-dimensional (3D) cross-linked conductive graphene sheets. When employed as cathode for sodium-nickel chloride (Na-NiCl 2 ) batteries, the as-obtained NiCl 2 -rGO aerogels exhibit excellent electrochemical performance with high reversible capacities (116 mAh g −1 after 50 cycles, 128 mAh g −1 in a fixed capacity window (20%–80% state of charge (SOC)) after 50 cycles), and a ultra-low polarization (0.05 V in the fixed capacity window). The outstanding performance of NiCl 2 -rGO aerogels can be attributed to the excellent conductivity of graphene. Moreover, the strong contact between NiCl 2 and graphene sheets can effectively promote the transfer of electrons. Compared with traditional tubular Na-NiCl 2 batteries, the molar ratio of Ni/NaCl of NiCl 2 -rGO aerogels can be decreased from 1.8 to the stoichiometric ratio (0.5). To the best of our knowledge, this work paves a perspective way for the first time to develop charged-state NiCl 2 -based cathodes with splendid performance for Na-NiCl 2 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
TOPICS IN CATALYSIS
·
2017
·Vol. 60
·期 12
·987-996
·
IF 2.486
Wang Wei,Li Xiang,Wang Anjie,Sun Zhichao,Chen Yongying
A series of mixtures of NiCl 2 , hypophosphites (NaH 2 PO 2 and NH 4 H 2 PO 2 ), and additives were used as precursors (denoted as x additive: y hypophosphite: z NiCl 2 , where x, y , and z represents the molar ratios of the compounds) for the synthesis of Ni 2 P both in N 2 and H 2 plasma. The catalytic performances of the obtained catalysts were evaluated by the hydrodenitrogenation (HDN) of quinoline (Q) and decahydroquinoline (DHQ). Ni 2 P was stoichiometrically synthesized by the treatment of 1.0NH 4 H 2 PO 2 :2.0NiCl 2 with N 2 plasma at a low total power input of 8 W (40 V × 0.2 A). In H 2 plasma, the precursor was over-reduced to a mixture of Ni and Ni 2 P, with Ni 2 P as the minor phase. The over-reduction can be inhibited by the addition of proper amount of alkali-metal chloride (NaCl or KCl) or P 2 O 5 . CaCl 2 facilitated the reduction of nickel salts to Ni. KCl was the best among the additives investigated. Both the surface and bulk over-reduction of 1.0NH 4 H 2 PO 2 :2.0NiCl 2 was inhibited by KCl, while P 2 O 5 mainly inhibited the bulk over-reduction. The addition of KCl strongly suppressed the hydrogenation of Q to DHQ, but facilitated the HDN of DHQ. On the other hand, not only the hydrogenation of Q but also the dehydrogenation of DHQ was substantially inhibited by P 2 O 5 .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2015
·
IF 3.34
Jie Yang,Mi Yan,Xiaodong Li,Shengyong Lu,Tong Chen,Jianhua Yan,Kees Olie,Alfons Buekens
Model fly ash (MFA) containing activated carbon (AC) as source of carbon, NaCl as source of chlorine and either NiO or NiCl 2 as de novo catalyst, was heated for 1 h at 350 °C in a carrier gas flow composed of N 2 containing 0, 6, 10, and 21 vol.% O 2 , to study the formation of PCDD/Fs (dioxins) and its dependence on oxygen. The formation of PCDD/Fs with NiCl 2 was stronger by about two orders of magnitude than with NiO and the difference augmented with rising oxygen concentration. The thermodynamics of the NiO–NiCl 2 system were represented, X-ray absorption near edge structural (XANES) spectroscopy allowed to probe the state of oxidation of the nickel catalyst in the MFA and individual metal species were distinguished using the LCF (Linear combination fitting) technique: thus three supplemental nickel compounds (Ni 2 O 3 , Ni(OH) 2 , and Ni) were found in the fly ash. Principal Component Analysis (PCA) indicates that both Ni 2 O 3 and NiCl 2 probably played an important role in the formation of PCDD/Fs.
研究领域:
环境化学
·
污染控制
·
废物焚烧
·
催化化学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yanpei Li,Xiangwei Wu,Jingyi Wang,Xingpeng Gao,Yingying Hu,Zhaoyin Wen
The sodium-nickel chloride (Na-NiCl 2 ) batteries technology has been considered as one of the most promising candidates for large-scale electrical energy storage application owing to its abundant electrode material resource, high energy density and safety. However, ultra-excessive Ni in the cathode leads to high material cost and the growth of cathode particles during cycles makes degradation of batteries performances, which hinder the further application of Na-NiCl 2 batteries. To address these challenges, we designed a free-standing Ni-less cathode with Ni/NaCl particles uniformly distributed in the three-dimensional (3D) conductive matrix constructed by carbonfiber (CF) and multiwalled carbon nanotubes (MWCNTs). The 3D hierarchical structure synthesized by low-cost vacuum filtration method can offer sufficient void space to accommodate the growth of NaCl particles and effectively enhance the electronic conductivity of the cathode. When the molar ratio of Ni/NaCl in the cathode is reduced to 1.0, a specific capacity of 90 mAh g −1 for planar Na-NiCl 2 batteries can be achieved after 170 cycles at 190 °C with a capacity retention of 67%, which is higher than that of traditional tubular Na-NiCl 2 batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 2
·125-133
·
IF 1.7
Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xin Ao,Zhaoyin Wen,Yingying Hu,Tian Wu,Xiangwei Wu,Qiming He
Nickel particles with different contents of Ni 3 S 2 surface layer were prepared for their application as cathode materials in Na/NiCl 2 batteries . The surface modification of nickel particles is found to prevent their growth and battery degradation during cycling. The optimum level of surface modification was determined by electrochemical tests and morphology characterization. Excessive Ni 3 S 2 layer seems to cause particle aggregation resulting in low reversible capacity. The capacity of the cell with optimum level of Ni 3 S 2 surface modification layer after 50 cycles is about 4 times greater than that without Ni 3 S 2 surface modification layer.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Wenlong Zhang,Huanxin Li,Han Zhou,Xiaohui Ning
Carbonaceous materials that possess reversible anions storage capacity and can worked as the cathode for Ni/NiCl 2 -Graphite battery . However, differences in storage capacity of carbonaceous cathodes and factors affecting anions storage capacity have not been thoroughly investigated. Here, we systematically evaluated the electrochemical properties and intercalation reaction mechanism of carbonaceous materials cathodes firstly. Expanded graphite and graphite paper cathodes display the highest specific capacity of 72 mAh/g and diffusion-controlled capacity ratios (∼98 %). X-ray powder diffraction and Raman spectroscopy analysis on the graphite intermetallic compounds confirmed the presence of stage-5 intercalation/de-intercalation reactions. Density functional theory calculation and ionic diffusion model analysis showed that the intercalation and diffusion process of AlCl 4 - in graphite interlayers play a crucial role in anions storage reaction. Rich-in-edged outer graphite-layers are more conducive to form intercalation reaction active sites and store anions effectively. The expanded graphite electrode exhibits the highest intercalation reaction ratio (φ R-GP = 1.40), confirming sufficient intercalation reaction active sites in each unit mass. And the multiple wrinkles and curled graphite sheets in expanded graphite provide adequate ionic transport/diffusion channels during electrochemical intercalation/de-intercalation reactions. Our findings provide significant support for understanding anions storage behaviors and designing cathodes with high anions storage capacity in the Ni/NiCl 2 -Graphite battery .
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
固态离子学
·
纳米材料
·
物理化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xingpeng Gao,Yingying Hu,Yanpei Li,Jingyi Wang,Xiangwei Wu,Jianhua Yang,Zhaoyin Wen
Improved power and cycle performances are eagerly required in intermediate-temperature sodium–metal halide (Na–MH) batteries. The existence of the low conductivity NiCl2 layer and the growth of the Ni and the NaCl particles limit the broader application of Na–NiCl2 battery. Herein, nickel–carbon composite nanofiber (NCCN) networks are synthesized by a multisolution electrospinning method to construct a novel three-dimensional cathode for Na–NiCl2 battery. The battery with the NCCN-based cathode shows significant improvement in rate and cycle performance at 190 °C. A capacity twice that of a conventional electrode after 100 cycles and 80% of the initial capacity after 400 cycles are observed at a current of 57 mA g–1. The NCCN-based cathode normally works more than 350 cycles without obvious degradation at a high current of 338 mA g–1, that is, a rate of 2C. Furthermore, in situ electrochemical impedance spectroscopy reveals faster electron and ion transport processes precisely on the charging and discharging processes of the NCCN-based cathode. It is found that the NCCNs can not only play the role of a continuous conductivity network but also limit the growth of grains. With the blocking effect of the carbon fibers, the volume expansions of Ni and NaCl grains are well restricted and their sizes were smaller than 500 nm and 7 μm after 50 cycles, respectively.
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
危险品化学品经营许可证（带存储）