JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Xinbo Mao,Tian Yu,Guilin Ma
A novel series of cobalt-free cathode materials, NdBaFe 2− x Mn x O 5+ δ (0.0 ⩽ x ⩽ 0.3), are prepared by a citric acid–nitrate process. X-ray diffraction (XRD) analysis indicates that all the samples are double-perovskite phases with cubic structure. The conductivity dependence of the cathode materials on temperature (300–800 °C) and oxygen partial pressure (1–10 −10 atm) is investigated. Among the tested samples, NdBaFe 1.9 Mn 0.1 O 5+ δ (NBFM10) exhibits the highest conductivity of 114 S cm −1 in air at 550 °C. The H 2 /air fuel cell with the NBFM10–BZCY composite cathode and NiO–BZCY composite anode as well as BaZr 0.1 Ce 0.7 Y 0.2 O 3 − α (BZCY) electrolyte membrane (ca. 30 μm thickness) was assembled and tested at 500–700 °C. The peak power density of the cell reaches 453 mW cm −2 , and the interfacial polarization resistance R p is only 0.06 Ω cm 2 under open circuit conditions, at 700 °C.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Seokyoung Choi,Wuliang Feng,Yongyao Xia
High nickel and Co-free layered cathodes (LiNi0.9Mn0.1O2, NM) for lithium-ion batteries (LIBs) have gained researchers’ interest recently because of their high energy density and being free of toxic elements, but they still suffer from inferior electrochemical performance due to the lattice instability during cycling. Herein, we successfully improved the electrochemical performance of NM using a high-entropy strategy. A high nickel Co-free multidoped high-entropy LiNi0.9Mn0.05Zr0.01Nb0.01Ti0.01Al0.01Mg0.01O2 (HE-NM, where HE represents high entropy with Zr, Nb, Ti, Al, and Mg dopants) cathode with five dopants was successfully synthesized. Owing to the effect of the multidopant, parasitic reactions and the accumulation of rock-salt phase were successfully suppressed, which led to uniformized interior stress and effectively inhibited microcracks during cycling. Consequently, HE-NM showed high thermal and structural stability with an initial discharge capacity of 206.35 mAh g–1 at 0.1 C and a retention of 76% after 100 cycles at 1 C, which showed a great advantage over the pristine NM (63%). This work provided a strategy for the stabilization of the NM cathode, which provided insight for the development of high-performance LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2021
·
IF 6.024
Kaibin Fang,Qian Xie,Chengyun Wang,Xiulian Qiu,Yali Wang,Wei Yang,Xin-wei Yu
LiNi0.8Co0.15Al0.05O2 (LNCA) cathode materials have an extremely high energy density, which can greatly enhance the driving range of pure electric vehicles if they are used in on-board batteries. However, the development of the LNCA cathode material is restricted by the expensive transition metal cobalt (Co). Therefore, researchers are devoted to finding other metals to replace Co to synthesize nickel (Ni)-rich Co-free materials to reduce the cost. To investigate the feasibility of replacing Co with manganese (Mn) as a transition metal, this paper reports the synthesis and compares the properties of four Ni-rich materials with different Co–Mn contents by gradually adding Mn to LNCA materials and reducing the Co content in equal amounts using an oxalic acid coprecipitation method. The results show that Mn can compensate the effect of Co deficiency to a certain extent; it is feasible to use Mn to completely replace Co in the synthesis of Ni-rich ternary Co-free materials under the premise of sacrificing a certain initial specific capacity. The tetrameric material LiNi0.8Co0.1Mn0.05Al0.05O2 substituted with trace amounts of Mn exhibited the most excellent electrochemical properties among the four synthesized materials. Therefore, to synthesize satisfactory Ni-rich Co-free materials, it is suggested to develop and synthesize quaternary Co-free materials on the basis of LiNi0.8Co0.1Mn0.05Al0.05O2.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 1.5
Su Yongyou,Zhu Bowen,Zhang Yingjie,Meng Qi,Dong Peng
With the rapid development of the global economy, energy crisis and environmental protection problems are in urgent need of solution. And the development of energy-saving and new energy vehicles is an inevitable trend to improve the energy structure, alleviate the conflict between oil supply and demand, and improve the living environment of human beings. Layered high nickel material is considered as one of the most promising cathode materials for power batteries because of its high energy density, high platform potential and good rate capability. However, it has problems such as high dependence on cobalt resources and poor cycling stability. In this paper, the preparation of layered high nickel cobalt-free cathode materials is investigated. Because Fe element has the advantages of large reserves and low price. At the same time, Fe makes the layered structure of the positive electrode more stable. In this paper, LiNi 0.8 Mn 0.17 Fe 0.03 O 2 (Li/TM = 1.01, 1.03, 1.05) materials with different Li/TM ratios were prepared by solid-phase method to investigate the effects of different Li/TM ratios on the structural and electrochemical properties of LiNi 0.8 Mn 0.17 Fe 0.03 O 2 materials. The results show that the materials synthesized with different Li/TM ratios have a layered structure. When the Li/TM ratio is 1.03, the crystal structure is the best and the degree of Li/Ni mixing is the least. The electrochemical performance study shows that the synthesized materials have the optimal electrochemical performance at the Li/TM ratio of 1.03. The electrochemical behavior during lithium embedding/delithiation was also investigated by quasi-in situ XRD, dQ/dV and CV tests. This study will provide some reference and guidance for the development and application of next-generation low-cost cobalt-free lithium-ion batteries.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Lixiong Qian,Rui Huang,Haoran Zhang,Shengxue Yan,Shaohua Luo
Co-free Fe/Mn-based cathodes have become a popular choice for sodium-ion batteries (SIBs) due to their affordability and impressive theoretical capacity. Nevertheless, the issue of their terrible battery life and rate capability continues to be their hindrances. A set of three-factor, three-level orthogonal experiments was adopted, including the calcination temperature, calcination time, and heating rate. And two single-factor experiments were carried out to further optimize the preparation conditions. Finally, the optimal conditions were obtained as follows: the calcination temperature was 900 °C, the calcination time was 12 h, and the heating rate was 5 °C min–1. The layered oxide cathode material Co-free P2-Na2/3Fe1/2Mn1/2O2 was synthesized by the solid phase method. Under the control of the optimal conditions, the P2-Na2/3Fe1/2Mn1/2O2 cathode could yield a remarkable initial discharge specific capacity (179.3 mAh g–1, 0.1 C) and cycle stability (54.6% over 50 cycles). These findings further declared that it was feasible to design Co-free Fe/Mn-based cathode materials with superior performance, which might offer guidance for popularizing cost-effective Fe/Mn-based cathode materials in the future.
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
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2022
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IF 10.383
Depeng Song,Zewen Yang,Qing Zhao,Xiaolin Sun,Yue Wu,Yuan Zhang,Jing Gao,Cheng Wang,Li Yang,Takeo Ohsaka,Futoshi Matsumoto,Jianfei Wu
Li-rich cathodes have potential for use in next-generation Li-ion batteries (LIBs) owing to their high specific capacity and low cost. However, their intrinsic cycling decay and voltage fading limit practical applications. In addition, these cathodes contain Co, which is nonrenewable, scarce, and expensive. This situation severely limits the rapid and sustainable development of low-cost LIBs. This paper introduces a novel dilute electrolyte to overcome these limitations based on the Co-free Li-rich Li1.2Mn0.54Ni0.26O2 (LMNO) cathode. An even and robust cathode-electrolyte interface (CEI) formed on the surface of LMNO further protects it from side reactions in the dilute electrolyte. This Co-free Li-rich cathode exhibits the best electrochemical performance reported to date among Li-rich cathodes in terms of outstanding cycling stability (capacity retention of 99.8% at 0.5 C) and dramatically suppressed voltage fading (only 0.3% after 100 cycles). This study demonstrates the potential of Co-free Li-rich cathodes for applications in next-generation LIBs.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Qi Liu,Zhenqian Wu,Jingying Sun,Ruimei Xu,Xianwei Li,Xiao Yu,Yong Liu
Co-free, Ni-rich cathode materials have aroused enormous attentions for the low cost, sustainable development of lithium-ion batteries. However, it is not easy to fabricate single-crystalline Ni-rich cathode materials from the hierarchical structured precursors via coprecipitation method. Furthermore, it is difficult to introduce Al dopant during the coprecipitation process to obtain high quality Ni-rich cathode material owing to the rapid sediment of Al 3+ . Herein, we developed a one-step stirring-assisted cation chelation and reassembly route for fabricating crack-free single-crystalline, Al-doped Co-free Ni-rich cathode material. The fabricated LiNi 0.8 Mn 0.16 Al 0.04 O 2 shows a high capacity of 204 mAh g −1 at 0.1C, excellent rate capability (143 mAh g −1 at 10C), and good cycling stability (an initial specific capacity of 178 mAh g −1 with capacity retention of 82.2% at 1C over 200 cycles). Furthermore, when tested at a raised temperature of 55 °C, it exhibited an initial capacity of 194.7 mAh g −1 with capacity retention of 82.1% at 1C over 100 cycles. The outstanding electrochemical performance can be ascribed to the synergistic effect of single crystalline structure and successful doping of Al element in the cathode, which enable fast ion and electron transport , suppress Li/Ni mixing and maintain the structural stability.
研究领域:
材料科学
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电化学
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能源存储技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Tiantian Wang,Lei Ni,Xu Sun,Hejie Lu,Haiqiang Li,Maosen Fu,Xiao Ma
Co-free binary cathode materials (LiNixMn1−xO2, x ≥ 0.5) are promising candidates for lithium-ion batteries (LIBs) due to their high specific capacity and low cost. The degradation of the low-temperature electrochemical performance of these materials not only hinders their practical application but also emerges as a critical research focus in energy storage technologies. In this work, the effect of Sm doping on the structure and electrochemical performance of LiNi0.55Mn0.45O2 (NM5545) cathode materials (x% Sm-NM5545, x = 0, 0.5, 1.0, 1.5) is systematically investigated over a wide temperature range (−10 to 45 °C). Sm doping significantly enhances the structural stability and enlarges interlayer spacing, which likely facilitates Li+ transport. Compared with undoped NM5545, the 1.0% Sm-NM5545 cathode materials exhibit remarkable improvements in capacity retention, which increases by 14.1%, 8.0%, and 9.4% after 100 cycles at temperatures of −10 °C, 25 °C, and 45 °C (1.0C, 3.0–4.45 V), respectively. Meanwhile, the discharge-specific capacity of 1.0% Sm-NM5545 cathode materials increases by 7.9 mA h g−1, 9.1 mA h g−1, and 12.9 mA h g−1 at the above respective temperatures. Electrochemical impedance spectroscopy and galvanostatic intermittent titration technique analyses confirm that Sm doping has enhanced the lithium-ion migration rate while reducing the charge transfer resistance in the modified materials. Furthermore, post-cycling characterization via scanning electron microscopy and X-ray photoelectron spectroscopy reveals that Sm doping effectively reinforces the structural integrity, suppresses crack propagation during high voltage cycling, and inhibits detrimental cathode–electrolyte interfacial reactions.
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
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Honglin Yan,Yuan Ha,Tao Ye,Xiaoya Gao,Xiangting Yue,Zhimin Li
Ni-rich LiNi x Mn 1- x O 2 cathodes have been extensively probed to resolve the electrochemical performance degradation in the absence of Co 3+ compared to LiNi x Co y Mn 1- x - y O 2 cathodes for lithium-ion batteries. Herein, LiNi 0.6 Mn 0.4 O 2 (NM64) and a series of nonmagnetic Al 3+ ions substituted NM64 cathode materials are designed and prepared via a sol–gel route. It is found that the inferior electrochemical performance of NM64 derives from the magnetic frustration arising from Mn ions and the unstable Mn 3+ ions, which will lead to severe Li/Ni mixing, and weak structural and interfacial stabilities of the cathode. The superconducting quantum interference device (SQUID) analysis proves that the nonmagnetic Al 3+ ion can lower the Li/Ni disorder in NM64 cathode by relieving magnetic frustration. Moreover, the dQ/dV and XPS analyses confirm that both structural and interfacial stabilities are enhanced for NM64 cathode owing to Al 3+ substitution, contributing to fewer byproducts after a long cycle. Consequently, LiNi 0.582 Mn 0.388 Al 0.03 O 2 cathode delivers a high discharging capacity of 179 mAh g −1 at 1.0C with a capacity retention of 87.6% after 100 cycles. This study not only gives an in-depth understanding of the mechanism of electrochemical performance degradation for NM64 cathode, but also demonstrates an efficient solving approach through Al 3+ complementary substitution.
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
ACS Applied Energy Materials
·
2023
·
IF 6.4
Heng Li,Zhi Li,Jiali Liu,Shuang Cao,Jiarui Chen,Hui Hu,Changmeng Guo,Xiaoyan Zhang,Xianyou Wang
With the advantages of low cost and high energy density, Co-free Li-rich layered oxides (LROs) are a potential next-generation lithium-ion battery cathode material for energy vehicles. However, LROs suffer from the defects of irreversible O-redox and low conductivity, producing poor cycling stability and rate performance and low initial Coulombic efficiency (ICE). In this work, the ammonium niobium oxalate (C4H4NNbO9·nH2O) treatment strategy is proposed to realize oxygen vacancy construction and Nb5+ doping on the surface of the LRO material. The results show that the optimized sample LRO-Nb-0.5 presents satisfactory electrochemical performance; for example, at 1C, the specific discharge capacity is 209.77 mAh g–1 and a capacity retention rate is 93.22% after 300 cycles. In addition, the high-rate capability is distinctly enhanced; a specific discharge capacity of 178.70 mAh g–1 can be achieved at 5C for LRO-Nb-0.5. Therefore, Nb5+ doping and oxygen vacancy regulation can be significant explorations for the promotion of the electrochemical performance of Co-free Li-rich materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Guofeng Jia,Faqiang Li,Jue Wang,Suqin Liu,Yuliang Yang
A dual substitution strategy is introduced to Co-free layered material LiNi0.5Mn0.5O2 by partially replacing Li and Ni with Na and Al, respectively, to achieve a superior cathode material for lithium ion batteries. Na+ ion functions as a “pillar” and a “ cationic barrier” in the lithium layer while Al3+ ion plays an auxiliary role in stabilizing structure and lattice oxygen to improve the electrochemical performance and safety. The stability of lattice oxygen comes from the binding energy between the Ni and O, which is larger due to higher valences of Ni ions, along with a stronger Al–O bond in the crystal structure and the “cationic barrier” effect of Na+ ion at the high-charge. The more stable lattice oxygen reduces the cation disorder in cycling, and Na+ in the Li layer squeezes the pathway of the transition metal from the LiM2 (M = metal) layer to the Li layer, stabilizing the layered crystal structure by inhibiting the electrochemical-driven cation disorder. Moreover, the cathode with Na–Al dual-substitution displays a smaller volume change, yielding a more stable structure. This study unravels the influence of Na–Al dual-substitution on the discharge capacity, midpoint potential, and cyclic stability of Co-free layered cathode materials, which is crucial for the development of lithium ion batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Zhiying Han,Jinghe Bai,Xu Chen,Xiaofei Zhu,Defeng Zhou
The cobalt-free cathode materials with high activity is critical to the commercial application of medium temperature solid oxide fuel cells (IT-SOFC). Herein, a series of cobalt-free Nb-doped Pr 2 Ni 1- x Nb x O 4 ( x = 0, 0.05, 0.10, and 0.15) perovskite oxides were successfully prepared, and the effects of Nb-doping on the structure, thermal stability and electrochemical properties of the cathode material are studied in detail. The Pr 2 Ni 1- x Nb x O 4 exhibits a K 2 NiF 4 type structure with Fmmm space group. The Nb 5+ cations that doped into Pr 2 NiO 4 replaces the Ni site, which increases the surface oxygen content, then effectively eliminates the phase transition of Pr 2 NiO 4 and significantly improves the ORR catalytic activity . The Pr 2 Ni 0.9 Nb 0.1 O 4 was found to occupy the lowest polarization resistance of 0.057 Ω cm 2 , and the peak power density of single cells supported by the electrolyte is 0.576 W cm −2 at 700 °C, which has good long-term stability.
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
危险品化学品经营许可证（带存储）