scholarly journals A Bio-Inspired Nanotubular Na2MoO4/TiO2 Composite as a High-Performance Anodic Material for Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 357
Author(s):  
Bo Yu ◽  
Zehao Lin ◽  
Jianguo Huang
Keyword(s):  
Lithium Ion Batteries ◽  
Tio2 Nanotubes ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Pure Tio2 ◽  
Electrochemical Performances ◽  
Layer By Layer ◽  
Porous Network ◽  
Tio2 Gel

A train of bio-inspired nanotubular Na2MoO4/TiO2 composites were synthesized by using a natural cellulose substance (e.g., commercial ordinary filter paper) as the structural template. The TiO2 gel films were coated on the cellulose nanofiber surfaces via a sol-gel method firstly, followed with the deposition of the poly(diallyldimethylammonium chloride)/Na2MoO4 (PDDA/Na2MoO4) bi-layers several times, through the layer-by-layer self-assembly route, yielding the (PDDA/Na2MoO4)n/TiO2-gel/cellulose composite, which was calcined in air to give various Na2MoO4/TiO2 nanocomposites containing different Na2MoO4 contents (15.4, 24.1, and 41.4%). The resultant nanocomposites all inherited the three-dimensionally porous network structure of the premier cellulose substance, which were formed by hierarchical TiO2 nanotubes anchored with the Na2MoO4 layers. When employed as anodic materials for lithium-ion batteries, those Na2MoO4/TiO2 nanocomposites exhibited promoted electrochemical performances in comparison with the Na2MoO4 powder and pure TiO2 nanotubes, which was resulted from the high capacity of the Na2MoO4 component and the buffering effects of the TiO2 nanotubes. Among all the nanotubular Na2MoO4/TiO2 composites, the one with a Na2MoO4 content of 41.4% showed the best electrochemical properties, such as the cycling stability with a capacity of 180.22 mAh g−1 after 200 charge/discharge cycles (current density: 100 mA g−1) and the optimal rate capability.

The encapsulation of MnFe2O4 nanoparticles into the carbon framework with superior rate capability for lithium-ion batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4445-4451 ◽  
Author(s):  
Weiqin Li ◽  
Cuihua An ◽  
Huinan Guo ◽  
Yan Zhang ◽  
Kai Chen ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Lithium Ion Batteries ◽  
Carbon Coating ◽  
Rate Capability ◽  
Lithium Ion ◽  
Template Method ◽  
Electrochemical Performances ◽  
Carbon Framework ◽  
Mnfe2o4 Nanoparticles

The mesoporous MnFe2O4@C nanorods has been prepared using self-template method. Benefiting from the synergistic effect of carbon coating and mesoporous feature, MnFe2O4@C displays outstanding electrochemical performances for LIBs.

scholarly journals Fabrication of hierarchically porous TiO2 nanofibers by microemulsion electrospinning and their application as anode material for lithium-ion batteries

2017 ◽  
Vol 8 ◽  
pp. 1297-1306 ◽  
Author(s):  
Jin Zhang ◽  
Yibing Cai ◽  
Xuebin Hou ◽  
Xiaofei Song ◽  
Pengfei Lv ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
Rapid Development ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Tio2 Nanofibers ◽  
Hierarchically Porous ◽  
Paraffin Oil

Titanium dioxide (TiO2) nanofibers have been widely applied in various fields including photocatalysis, energy storage and solar cells due to the advantages of low cost, high abundance and nontoxicity. However, the low conductivity of ions and bulk electrons hinder its rapid development in lithium-ion batteries (LIB). In order to improve the electrochemical performances of TiO2 nanomaterials as anode for LIB, hierarchically porous TiO2 nanofibers with different tetrabutyl titanate (TBT)/paraffin oil ratios were prepared as anode for LIB via a versatile single-nozzle microemulsion electrospinning (ME-ES) method followed by calcining. The experimental results indicated that TiO2 nanofibers with the higher TBT/paraffin oil ratio demonstrated more axially aligned channels and a larger specific surface area. Furthermore, they presented superior lithium-ion storage properties in terms of specific capacity, rate capability and cycling performance compared with solid TiO2 nanofibers for LIB. The initial discharge and charge capacity of porous TiO2 nanofibers with a TBT/paraffin oil ratio of 2.25 reached up to 634.72 and 390.42 mAh·g−1, thus resulting in a coulombic efficiency of 61.51%; and the discharge capacity maintained 264.56 mAh·g−1 after 100 cycles, which was much higher than that of solid TiO2 nanofibers. TiO2 nanofibers with TBT/paraffin oil ratio of 2.25 still obtained a high reversible capacity of 204.53 mAh·g−1 when current density returned back to 40 mA·g−1 after 60 cycles at increasing stepwise current density from 40 mA·g−1 to 800 mA·g−1. Herein, hierarchically porous TiO2 nanofibers have the potential to be applied as anode for lithium-ion batteries in practical applications.

TiNb2O7 nanorods as a novel anode material for secondary lithium-ion batteries

2016 ◽  
Vol 09 (06) ◽  
pp. 1642004 ◽  
Author(s):  
Lei Hu ◽  
Chunfu Lin ◽  
Changhao Wang ◽  
Chao Yang ◽  
Jianbao Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Average Length ◽  
Sol Gel ◽  
Specific Capacity ◽  
Sodium Dodecyl ◽  
Rate Capability ◽  
Lithium Ion ◽  
Average Diameter ◽  
Electrochemical Performances ◽  
Text Type

TiNb2O7 nanorods have been successfully fabricated by a sol–gel method with a sodium dodecyl surfate (SDS) surfactant. X-ray diffraction indicates that the TiNb2O7 nanorods have a Ti2Nb[Formula: see text]O[Formula: see text]-type crystal structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that the nanorods have an average diameter of [Formula: see text][Formula: see text]100[Formula: see text]nm and an average length of [Formula: see text][Formula: see text]300[Formula: see text]nm. As a result of such nanosizing effect, this new material exhibits advanced electrochemical performances in terms of specific capacity, rate capability and cyclic stability. At 0.1[Formula: see text]C, it delivers a large first-cycle discharge/charge capacity of 337/279 mAh g[Formula: see text]. Its capacities remain 248, 233, 214, 182, 154 and 122[Formula: see text]mAh g[Formula: see text] at 0.5, 1, 2, 5, 10 and 20[Formula: see text]C, respectively. After 100 cycles, its capacity at 10[Formula: see text]C remains 140[Formula: see text]mAh g[Formula: see text] with large capacity retention of 91.0%.

Synthesis and electrochemical properties of SrWO4/graphene composite as anode material for lithium-ion batteries

2014 ◽  
Vol 07 (02) ◽  
pp. 1450010 ◽  
Author(s):  
Linsen Zhang ◽  
Qingling Bai ◽  
Linzhen Wang ◽  
Aiqin Zhang ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Sol Gel ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Electrochemical Performances ◽  
Graphene Composite ◽  
Discharge Method ◽  
Charge Discharge

SrWO 4/graphene composite was synthesized via a sol–gel method. The morphology and structure of the products were analyzed by SEM, TEM and XRD. The electrochemical performances of SrWO 4/graphene composite were investigated by galvanostatic charge/discharge method, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that the first cycle of the reversible specific capacity of SrWO 4/graphene composite can reach to 575.9 mAh g-1 at 50 mA g-1. The charge/discharge cycling study indicates that the SrWO 4/graphene composite was provided with excellent cycle performance and outstanding rate capability.

In Situ Synthesis of Graphitized-Carbon Coated Li4Ti5O12/C Anode for High-Rate Lithium Ion Batteries

2015 ◽  
Vol 814 ◽  
pp. 358-364
Author(s):  
Peng Xiao Huang ◽  
Shui Hua Tang ◽  
Hui Peng ◽  
Xing Li
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Phase Method ◽  
Electrochemical Performances ◽  
Graphitized Carbon ◽  
Carbon Coated

Graphitized-Carbon coated Li4Ti5O12/C (Li4Ti5O12/GC) composites were prepared from Li2CO3, TiO2 and aromatic resorcinol via a facile rheological phase method. The microstructure and morphology of the samples were determined by XRD and SEM. The electrochemical performances of the samples were characterized by galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results reveal that the coating of graphitized carbon could effectively enhance the charge/transfer kinetics of the Li4Ti5O12 electrode. The Li4Ti5O12/GC could deliver a discharge specific capacity of 166 mAh/g at 0.2 C, 148 mAh/g at 1.0 C, 142 mAh/g at 3.0 C, 138 mAh/g at 5.0 C and 127 mAh/g at 10.0 C, respectively, and it still could remain at 132 mAh/g after cycled at 5.0 C for 100 cycles. The excellent rate capability of the Li4Ti5O12/C makes it a promising anode material for high rate lithium ion batteries.

scholarly journals NiO/Carbon Aerogel Microspheres with Plum-Pudding Structure as Anode Materials for Lithium Ion Batteries

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2363
Author(s):  
Renqing Guo ◽  
Xiaohua Huang ◽  
Yan Lin ◽  
Yiqi Cao
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Carbon Aerogel ◽  
Cycling Performance ◽  
Initial Charge

To enhance the electrochemical performance of nickel oxide as anode materials for lithium ion batteries, NiO/carbon aerogel microspheres with a plum-pudding structure were designed and prepared by a sol-gel technique followed by two calcination processes under different atmospheres. Carbon aerogel microspheres (pudding) can act as a buffering and conductive matrix to enhance the structural stability and conductivity of the embedded NiO particles (plums), which are quite advantageous to the cycling performance and rate capability. Consequently, NiO/carbon aerogel microspheres with a plum-pudding structure deliver an initial charge capacity of 808 mAh g−1 and a reversible capacity retention of 85% after 100 cycles. The enhancement in electrochemical performance relative to pure NiO microspheres suggests that the design of a plum-pudding structure is quite effective.

Porous LiMn2O4 Microspheres With Different Pore Size: Preparation and Application as Cathode Materials for Lithium Ion Batteries

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Shiyou Li ◽  
Konglei Zhu ◽  
Jinliang Liu ◽  
Dongni Zhao ◽  
Xiaoling Cui
Keyword(s):  
Pore Size ◽  
Lithium Ion Batteries ◽  
Rate Capability ◽  
Lithium Ion ◽  
Nitrogen Adsorption ◽  
Electrochemical Performances ◽  
Discharge Process ◽  
Ion Diffusion ◽  
X Ray Diffraction ◽  
Adsorption Desorption

Three types of LiMn2O4 (LMO) microspheres with different pore size are prepared by a facile method, using porous MnCO3–MnO2 and Mn2O3 microspheres as the self-supporting template, for lithium ion batteries (LIBs) cathode material. Briefly, Mn2O3 and MnO2 microspheres are heated in air at 600 °C for 10 h to synthesize porous Mn2O3 spheres. Then the mixture of as-prepared spherical Mn2O3 and LiNO3 is calcined to obtain the LMOs. The morphology and structure of LMOs are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and nitrogen adsorption/desorption analyses. The result shows that the maximum pore diameters of LMOs are 17 nm, 19 nm, and 11 nm, respectively. All LMOs microspheres are composed of similar sized nanoparticles; however, the surface of these microspheres is strewed with dense tinier pores or sparse larger pores. Generally, the nanoparticles will reduce the path of Li+ ion diffusion and increases the reaction sites for lithium insertion/extraction. Moreover, the pores can provide buffer spaces for the volume changes during charge–discharge process. The electrochemical performances of LMOs are investigated and LMO2 exhibits extremely good electrochemical behavior, especially the rate capability. The as-prepared LMO2 delivers a discharge capacity of 124.3 mAh g−1 at 0.5 C, retaining 79.6 mAh g−1 even at 5 C. The LMO2 sample also shows good capacity retention of 96.9% after 100 cycles at 0.5 C.

scholarly journals Superior Performances of B-doped LiNi0.84Co0.10Mn0.06O2 cathode for advanced LIBs

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Seung-Hwan Lee ◽  
Bong-Soo Jin ◽  
Hyun-Soo Kim
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Layered Structure ◽  
Rate Capability ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Active Materials ◽  
Promising Candidate ◽  
Boron Doped ◽  
Cation Disordering

AbstractBoron-doped Ni-rich LiNi0.84Co0.10Mn0.06O2 (B-NCM) cathode material is prepared and its electrochemical performances are investigated. The structural properties indicate that the incorporation of boron leads to highly-ordered layered structure and low cation disordering. All samples have high areal loadings of active materials (approximately 14.6 mg/cm2) that meets the requirement for commercialization. Among them, the 1.0 wt% boron-doped NCM (1.0B-NCM) shows the best electrochemical performances. The 1.0B-NCM delivers a discharge capacity of 205. 3 mAh g−1, cyclability of 93.1% after 50 cycles at 0.5 C and rate capability of 87.5% at 2 C. As a result, we can conclude that the 1.0B-NCM cathode can be regarded as a promising candidate for the next-generation lithium ion batteries.

scholarly journals Application of PVDF Organic Particles Coating on Polyethylene Separator for Lithium Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3125 ◽  
Author(s):  
Yuan Wang ◽  
Chuanqiang Yin ◽  
Zhenglin Song ◽  
Qiulin Wang ◽  
Yu Lan ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Retention Rate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Organic Polymer ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Organic Particles ◽  
Surface Modified

Surface coating modification on a polyethylene separator serves as a promising way to meet the high requirements of thermal dimensional stability and excellent electrolyte wettability for lithium ion batteries (LIBs). In this paper, we report a new type of surface modified separator by coating polyvinylidene fluoride (PVDF) organic particles on traditional microporous polyethylene (PE) separators. The PE separator coated by PVDF particles (PE-PVDF separator) has higher porosity (61.4%), better electrolyte wettability (the contact angle to water was 3.28° ± 0.21°) and superior ionic conductivity (1.53 mS/cm) compared with the bare PE separator (51.2%, 111.3° ± 0.12°, 0.55 mS/cm). On one hand, the PVDF organic polymer has excellent organic electrolyte compatibility. On the other hand, the PVDF particles contain sub-micro spheres, of which the separator can possess a large specific surface area to absorb additional electrolyte. As a result, LIBs assembled using the PE-PVDF separator showed better electrochemical performances. For example, the button cell using a PE-PVDF as the separator had a higher capacity retention rate (70.01% capacity retention after 200 cycles at 0.5 C) than the bare PE separator (62.5% capacity retention after 200 cycles at 0.5 C). Moreover, the rate capability of LIBs was greatly improved as well—especially at larger current densities such as 2 C and 5 C.

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