APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bao Zhang,Chao Zheng,Zhiming Xiao,Keyi Xian,Heng Wen,Na Lu,Xinyou He,Long Ye,Jiexi Wang,Xing Ou,Chunhui Wang
Nickel-rich cobalt-low layered oxides have attracted much attention as positive electrode materials for high-energy lithium-ion batteries due to their high capacity and low cost, but their inherent stress accumulation and severe cationic mixed reactions will deteriorate the cycling performance. Herein, the nickel-rich single-crystalline LiNi 0.90 Co 0.06 Mn 0.04 O 2 cathode material doped with W and Mg (NCM-WM) has been fabricated to overcome its structure degradation issues. It can be found that the Li/Ni cation mixture can be suppressed by the introduction of Mg 2+ into Li + situs and the replacement of transition metal ions by W 6+ . Meanwhile, the co-doing strategy synergistically depresses the irreversible H2-H3 phase transition to weaken the internal stress, and employs the heteroatoms as the pillar ions to prevent layer structure collapse. In addition, the reduced particle size induced by the W 6+ and increased free electron resulted by Mg 2+ can cooperatively improve the migration kinetics of ions and electrons in the process of cycling. As expected, the above advanced effects result in the prominent cycling properties (capacity retention of 86.7 %, 150 cycles, 2C) of the designed Ni-rich electrode materials. These results demonstrate that the co-doped design is a greatly effective strategy to reinforce the cycling performance of Ni-rich single-crystalline materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
固态化学
·
电极材料
·
掺杂工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 17
·7911-7920
·
IF 2.7
Pengchao Liang,Yuanchao Li,Xiangzhen Xiao,Shumin Fan,Jingjing Ma,Jingjie Liu,Yongqiang Dong,Yuhang Zong,Guangri Xu,Li Yang
Although they possess a high working voltage and environmental compatibility, and are low in cost with abundant resources, the poor cycling performance and rapid capacity attenuation of LiMn2O4 cathodes at high temperature restrict their extensive application. In this study, LiMn2O4 materials are synthesized by a simple rheology-assisted solid-phase method using citric acid as an additive. The citric acid improves the uniformity of the mixed raw materials, resulting in a reduction in particle agglomeration. Consequently, the synthesized LiMn2O4 shows an initial capacity of 117.4 mA h g−1 with a capacity retention of 79.50% at 2C after 300 cycles and 54.78% of the initial discharge capacity at 20C. This work provides a strategy for modifying multicomponent transition metal oxides for advanced lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机固体化学
·
电池技术
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jintao Liu,Hongli Bai,Junming Guo,Changwei Su,Xiaofang Liu
LiAl 0.15 Mn 1.85 O 4 cathode materials have been rapidly synthesized by a solution combustion technique at various heat treatment time to investigate the crystal morphological change and evaluate the electrochemical performances. The structures of as-prepared samples were characterized by X-ray diffraction (XRD), which demonstrates that all the samples present the typically characteristic diffraction peaks of spinel LiMn 2 O 4 . The crystal morphological changes of the samples were observed by field emission scanning electron microscope (FESEM), which confirms that with the increase of heat treatment time, crystal morphology gradually grows to regular octahedron morphology, the average particle size becomes bigger, homogeneity of particle size distribution increases and agglomeration phenomenon is alleviated. Galvanostatic charge-discharge tests show that LiAl 0.15 Mn 1.85 O 4 sample sintered at 9 h exhibits the optimal cycling stability and rate performance, which delivers a capacity retention rate of 84.3 % after 500 cycles with an initial discharge specific capacity of 110.5 mAh g -1 at 1 C (1 C=148 mAh g -1 ) and 25 °C. At the higher rate of 5 C, a capacity retention rate of 82.1 % can be obtained after 500 cycles with an initial discharge specific capacity 103.2 mAh g -1 at 5 C and 25 °C. The elevated-temperature cycling stability of the sample at calcination of 9 h is also optimal, which shows a capacity retention rate of 90.1 % after 100 cycles with an initial discharge specific capacity of 105.3 mAh g -1 at 1 C and 55 °C. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests prove that the sample at calcination of 9 h presents the better electrode reversibility, the lowest apparent activation energy, more rapidly charge-transfer and Li + diffusion kinetics processes.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机固体化学
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2020
·
IF 2.6
Tao Wang,Yangyang Liu,Yue Deng,Hanyun Cheng,Xiaozhong Fang,Liwu Zhang
The heterogeneous reaction of SO2 on manganese oxides is poorly understood. By means of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), this study investigated the reaction kinetics and product fractions on four types of manganese oxides. Due to the positive and negative moisture impacts, 68% RH (relative humidity) becomes the most favorable condition for the uptake of SO2. Mn3O4 shows the greatest uptake capacity of SO2, followed by MnO2 and Mn2O3, with that of MnO being the weakest. Curve-fitting procedures were undertaken to further dissect the product spectra. Increased RH facilitates the physical adsorption of SO2 and generally weakens the oxidation capacity of manganese oxides. The oxidation ability is greatest for MnO, followed by MnO2 and Mn3O4, with that of Mn2O3 being the weakest. Additionally, the particle acidity (pH) was estimated by the ionization equilibrium of sulfurous acid and the relative contributions of S(IV) species. MnO and Mn3O4 become more acidic as RH increases while Mn2O3 and MnO2 are the most acidic at 50% RH, which can be attributed to the different uptake capacities of SO2 and H2O on each sample. Overall, for the heterogeneous reaction of SO2 on manganese oxides, both particle type and moisture condition influence the reaction kinetics and product fractions. This work improves the understanding of the heterogeneous process on atmospheric manganese-rich particles.
研究领域:
环境化学
·
大气科学
·
表面化学
·
气溶胶化学
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·Vol. 30
·期 25
·e202400088
·
IF 3.9
Xin Li,Xin Lai,Qingquan Kong,Xuguang An,Jing Zhan,Xiaolei Li,Xiaonan Liu,Weitang Yao
P2-type layered manganese-based oxides have attracted considerable interest as economical, cathode materials with high energy density for sodium-ion batteries (SIBs). Despite their potential, these materials still face challenges related to sluggish kinetics and structural instability. In this study, a composite cathode material, Na 0.67 Ni 0.23 Mn 0.67 V 0.1 O 2 @Na 3 V 2 O 2 (PO 4 ) 2 F was developed by surface-coating P2-type Na 0.67 Ni 0.23 Mn 0.67 V 0.1 O 2 with a thin layer of Na 3 V 2 O 2 (PO 4 ) 2 F to enhance both the electrochemical sodium storage and material air stability. The optimized Na 0.67 Ni 0.23 Mn 0.67 V 0.1 O 2 @5wt %Na 3 V 2 O 2 (PO 4 ) 2 F exhibited a high discharge capacity of 176 mA h g −1 within the 1.5-4.1 V range at a low current density of 17 mA g −1 . At an increased current density of 850 mA g −1 within the same voltage window, it still delivered a substantial initial discharge capacity of 112 mAh g −1 . These findings validate the significant enhancement of ion diffusion capabilities and rate performance in the P2-type Na 0.67 Ni 0.33 Mn 0.67 O 2 material conferred by the composite cathode. Graphical We propose a composite cathode material, Na 0.67 Ni 0.23 Mn 0.67 V 0.1 O 2 @Na 3 V 2 O 2 (PO 4 ) 2 F, featuring synergistic modification through doping and coating. The optimized Na 0.67 Ni 0.23 Mn 0.67 V 0.1 O 2 @5wt %Na 3 V 2 O 2 (PO 4 ) 2 F exhibited a high discharge capacity of 176 mAh g −1 within the 1.5–4.1 V range at a low current density of 17 mA g −1 . At an increased current density of 850 mA g −1 within the same voltage window, it still delivered a substantial initial discharge capacity of 112 mAh g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yongchuan Liu,Xiaofei Miao,Jianhui Fang,Xiangxin Zhang,Sujing Chen,Wei Li,Wendou Feng,Yuanqiang Chen,Wei Wang,Yining Zhang
Flexible solid-state supercapacitors provide a promising energy-storage alternative for the rapidly growing flexible and wearable electronic industry. Further improving device energy density and developing a cheap flexible current collector are two major challenges in pushing the technology forward. In this work, we synthesize a nitrogen-doped graphene/MnO2 nanosheet (NGMn) composite by a simple hydrothermal method. Nitrogen-doped graphene acts as a template to induce the growth of layered δ-MnO2 and improves the electronic conductivity of the composite. The NGMn composite exhibits a large specific capacitance of about 305 F g–1 at a scan rate of 5 mV s–1. We also create a cheap and highly conductive flexible current collector using Scotch tape. Flexible solid-state asymmetric supercapacitors are fabricated with NGMn cathode, activated carbon anode, and PVA–LiCl gel electrolyte. The device can achieve a high operation voltage of 1.8 V and exhibits a maximum energy density of 3.5 mWh cm–3 at a power density of 0.019 W cm–3. Moreover, it retains >90% of its initial capacitance after 1500 cycles. Because of its flexibility, high energy density, and good cycle life, NGMn-based flexible solid state asymmetric supercapacitors have great potential for application in next-generation portable and wearable electronics.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
柔性电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Xue Zhou,Yuanfu Deng,Lina Wan,Xusong Qin,Guohua Chen
A uniform carbon coated LiFe 0.15 Mn 0.85 PO 4 (LFMP/C) cathode material is synthesized by a surfactant-assisted, highly reproducible and energy-saving solid state method using a bimetallic oxalate (Fe 0.15 Mn 0.85 C 2 O 4 ) precursor. The obtained LiFe 0.15 Mn 0.85 PO 4 /C composite is characterized by X-ray diffraction (XRD), Raman spectrum , elemental analysis (EA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results demonstrate that the oleic acid as a surfactant , for the scale preparation of LFMP, plays a critical role in controlling size of the obtained composite. The LiFe 0.15 Mn 0.85 PO 4 /C exhibits high specific capacity and good rate performance. It delivers initial discharge capacities of 156.5, 142.5, 129.0 and 103.0 mAh g −1 at 0.05, 0.1, 0.5 and 1C, respectively. Moreover, it shows good cycle stability at both room temperature (25 °C, 89% and 88% capacity retention after 250 and 500 cycles at 0.5 and 1C rates, respectively) and elevated temperature (55 °C, 80% capacity retention after 200 cycles at 0.5C rate). The significantly improved rate and cycling capability of the LiFe 0.15 Mn 0.85 PO 4 /C is attributed to the uniform carbon coating layer on the primary particles, the conductive network provided by the carbon between the LiMn 0.15 Fe 0.85 PO 4 /C particles and the sufficient pores formed in the LiFe 0.15 Mn 0.85 PO 4 /C aggregates.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Shaokun Chong,Yifang Wu,Chaofeng Liu,Yuanzhen Chen,Shengwu Guo,Yongning Liu,Guozhong Cao
Potassium-ion batteries (PIBs) have been receiving a great deal of attention owing to abundant and cost-effective potassium resources. However, the key issue is to explore suitable electrode materials for accommodating the large size K-ions reversibly. In this report, K 1.06 Mn 8 O 16 /CNT hybrids are systematically studied for the first time as bifunctional PIBs-electrodes, in which Mn-ions play as the redox center. As the cathode, it exhibits excellent electrochemical kinetics and reversibility, as well as highly structure stability. The cathode displays an unprecedented capacity of 309.4 mA h g −1 at 20 mA g −1 with the energy density of 733.3 Wh kg −1 and outstanding rate performance (187.1 mA h g −1 at 500 mA g −1 ). In addition, the high capacity of 636.6 mA h g −1 at 20 mA g −1 , ultra-long cycling lifespan over 500 cycles and remarkable rate capability can also be acquired when the material was tested as the anode. The extraordinary electrochemical properties are ascribed to the well-developed conductive network and robust microstructure stability. Meanwhile, the symmetrical K-ions full cell exhibits high discharge capacity of 241.0 mA h g −1 at 100 mA g −1 . This work reveals the K-ions storage mechanism in cryptomelane bifunctional electrodes in depth and the fundamental understanding help us open up a new direction for PIBs.
研究领域:
电化学
·
能源材料
·
纳米材料
·
电池技术
·
材料科学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2018
·Vol. 6
·期 11
·2139-2145
·
IF 3.175
Wei Pan,Wenjie Peng,Guochun Yan,Huajun Guo,Zhixing Wang,Xinhai Li,Weihua Gui,Jiexi Wang,Ning Chen
This study focuses on suppressing the voltage decay and improving the electrochemical performance of Li-rich and manganese-based (LRM) material by Nb 2 O 5 coating, which is realized by an effective soft-chemical route using a mixture of ethanol and water as co-solvent. After Nb 2 O 5 coating, the resulted material demonstrates superior electrochemical performance as cathode material for LIBs. Particularly, it shows an excellent capacity retention of 98 % after 200 cycles at 1 C (1 C=250 mA g −1 ). Voltage decay within cycling is also obviously suppressed by Nb 2 O 5 coating. Moreover, it exhibits superior rate capacities, delivering 189 and 152 mAh g −1 at high current densities of 2 and 5 C, respectively. The improved electrochemical performance of Nb 2 O 5 coated sample can be attributed to that Nb 2 O 5 can suppress the phase transformation and voltage decay by acting as not only a fast ion conductor to accelerate the lithium ion diffusion at the cathode/electrolyte interface, but also an inert protective layer to reduce the direct contact between the cathode and electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机非金属材料
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Peilin Zhang,Jinzhe Liu,Chencheng Zhou,Shouzhi Guo,Shuo Li,Yun Yang,Jing Wu,Di Yu,Hanfei Chen,Ming Zhao,Luyang Chen
Manganese monoxide (MnO) has emerged as a promising anode material in lithium-ion batteries (LIBs) due to its large lithiation capacity, low voltage hysteresis and environmental friendliness. In this work, we have developed the nitrogen-doped carbon coated MnO porous microspheres (MnO@NC), which consist of small nanocrystals with interparticle mesopores via a self-templated solvothermal synthesis and subsequent in-situ pyrolysis of polypyrrole precursors. By virtue of the conductive outer layer of nitrogen-doped carbon (NC) and the abundant inner mesopores, the hierarchical MnO@NC porous microspheres manifest the superior lithium storage properties as anode for LIBs. In detail, the optimized MnO@NC electrode delivers a high initial discharge capacity of 1037 mAh g − 1 at 0.2 A g − 1 , remains the discharge capacity of 890 mAh g −1 at 1A g − 1 after 500 cycles, indicates the outstanding rate capability with a specific capacity of 450 mAh g − 1 at 5A g − 1 .
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000684
·
IF 4.948
Wenyan Chen,Donghui Xu,Yuancheng Chen,Tang Tang,Shaojie Kuang,Haikuo Fu,Wuyi Zhou,Xiaoyuan Yu
Using polyvinyl alcohol and N-rich polyacrylonitrile as carbon sources, uniform MFe 1– x Mn x PO 4 (M = Li, Na)/N-doped C nanofibers are synthesized by sol–gel pretreatment and an electrospinning method followed by calcination. The as-prepared nanofibers exhibit a 3D homogenous network with uniform distribution of MFe 1− x Mn x PO 4 nanoparticles. The lattice distorts after Mn-doping without altering the original crystalline structure, increasing conductivity and enhancing the efficiency of Li + /Na + diffusion. When applied for lithium ion batteries, the optimized LiFe 0.8 Mn 0.2 PO 4 /C nanofibers deliver a considerable initial capacity of 169.9 mAh g −1 with coulombic efficiency of 92.4%. It also displays the excellent cycling stability with reversible capacity of 160 mAh g −1 after 200 cycles at 0.1 C and high rate performances with the specific capacity of 93 mAh g −1 at 5 C. Furthermore, NaFe x Mn 1− x PO 4 /N-doped C nanofibers are also synthesized by the same method for sodium-ion batteries, which exhibit an initial capacity of 134 mAh g −1 and specific capacity of 106 mAh g −1 at 0.1 C and 90 mAh g −1 at 1 C after 200 cycles. Owing to the facile fabrication process, these nanofibers are promising cathodes for lithium/sodium ion batteries with excellent electrochemical performances.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Chang Chen,Borui Liu,Qiang Ru,Shaomeng Ma,Bonan An,Xianhua Hou,Shejun Hu
Cubic Spinel MnCo 2 O 4 /graphene sheets (MCO/GS) nanocomposites are synthesized by a facile hydrothermal method with a subsequent annealing process . Nano-sized MnCo 2 O 4 particles are evenly embedded in paper-like graphene sheets , possessing a unique nanoparticles-on-sheets hybrid nanostructure , with particle size around 20–50 nm. Owing to the special nanoparticles-on-sheets structures, MCO/GS nanocomposites have an outstanding electrochemical performance for rechargeable energy storage devices. As an anode material for lithium-ion batteries, MCO/GS electrodes exhibit high reversible discharge capacities (1350.4 mAh g −1 at the initial rate of 100 mA g −1 ), excellent rate capability (462.1 mAh g −1 at a current rate of 4000 mA g −1 ) and outstanding cycling performance (584.3 mAh g −1 at 2000 mA g −1 after 250 cycles). Meanwhile, as an anode material for sodium-ion batteries, MCO/GS electrodes also exhibit comparably promising electrochemical characteristics. Greatly improved electrochemical properties can be assigned to the special advantageous nanostructures. Besides, the existence of graphene sheets is beneficial to the transportation of ions/electrons during battery operation. The outstanding electrochemical performance demonstrates that the lithium/sodium storage capability of MCO/GS nanocomposites is highly promising for high-capacity batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）