scholarly journals High Rate Performance of Ca-Doped Li4Ti5O12 Anode Nanomaterial for the Lithium-Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Heming Deng ◽  
Wei Liang ◽  
Dexin Nie ◽  
Jian Wang ◽  
Xu Gao ◽  
...  
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Structure Changes ◽  
High Rate Performance ◽  
Li4ti5o12 Anode

The spinel Li4Ti5O12 (LTO) has been doped by Ca2+ via a solid-state reaction route, generating highly crystalline Li3.9Ca0.1Ti5O12 powders in order to improve the electrochemical performance as an anode. The structure changes, morphologies, and electrochemical properties of the resultant powders have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV), respectively. Crystal structure and composition were analyzed, and results were obtained with various tests of LTO. Electrochemical measurements revealed that Li3.9Ca0.1Ti5O12 anodes exhibit better rate capability, better cycling stability, and a higher specific capacity than pure LTO anodes.

Electrochemical Properties of Li0.99Gd0.01FePO4/C Composite Cathode for Lithium-Ion Batteries

2010 ◽  
Vol 146-147 ◽  
pp. 1233-1237
Author(s):  
Bin Sun ◽  
Yi Feng Chen ◽  
Kai Xiong Xiang ◽  
Wen Qiang Gong ◽  
Han Chen
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Lattice Doping ◽  
Scanning Electron

Li0.99Gd0.01FePO4/C composite was prepared by solid-state reaction, using particle modification with amorphous carbon from the decomposition of glucose and lattice doping with supervalent cation Gd3+. All samples were characterized by X-ray diffraction, scanning electron microscopy, multi-point Brunauer Emmett and Teller methods. The electrochemical tests show Li0.99Gd 0.01FePO4/C composite obtains the highest discharge specific capacity of 154 mAh.g-1 at C/10 rate and the best rate capability. Its specific capacity reaches 131 mAh.g-1 at 2 C rate. Its capacity loss is only 14.9 % when the rate varies from C/10 to 2 C.

scholarly journals Coprecipitation and Characterization of Na Substituted LiMn0.5Ni0.5O2 for Lithium ion Battery Cathodes

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Le Phan Cam Linh ◽  
Nguyen Van Ky ◽  
Pham Duy Long ◽  
Giang Hong Thai ◽  
Dang Thi Thanh Le ◽  
...  
Keyword(s):  
Lattice Constant ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Solid State Reaction Method ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Na Substitution ◽  
Co Precipitation

In this study, Li1-xNaxMn0.5Ni0.5O2 materials were successfully synthesized by co-precipitation following by solid state reaction method. X-ray powder diffraction analyses showed that the Li1-xNaxMn0.5Ni0.5O2 materials were single-phase and crystallized in a rhombohedral structure with a space group of R–3m at Na substitution concentrations of 0–20%. When increasing the concentration of Na substitution to 30%, diffraction peaks of Na2Mn3O7 as an impurity phase appeared in the X-ray diffraction pattern of the synthesized material. Rietveld refinements of the X-ray diffraction patterns revealed that the substitutions of Na for Li resulted in significant increments of the lattice constant c and slight increments of the lattice constant a. The results of galvanostatic charge/discharge measurements showed that the substitutions reduced the specific capacity but improved the rate capability of the Li0.8Na0.2Mn0.5Ni0.5O2 in comparison with the LiMn0.5Ni0.5O2 material.

scholarly journals N–Doped Porous Carbon Microspheres Derived from Yeast as Lithium Sulfide Hosts for Advanced Lithium-Ion Batteries

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1822
Author(s):  
Sheng Liang ◽  
Jie Chen ◽  
Xuehua He ◽  
Lingli Liu ◽  
Ningning Zhou ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Carbon Microspheres ◽  
Liquid Infiltration ◽  
Lithium Sulfide ◽  
High Rate Performance

Lithium sulfide (Li2S) is considered to be the best potential substitution for sulfur-based cathodes due to its high theoretical specific capacity (1166 mAh g−1) and good compatibility with lithium metal-free anodes. However, the electrical insulation nature of Li2S and severe shuttling of lithium polysulfides lead to poor rate capability and cycling stability. Confining Li2S into polar conductive porous carbon is regarded as a promising strategy to solve these problems. In this work, N-doped porous carbon microspheres (NPCMs) derived from yeasts are designed and synthesized as a host to confine Li2S. Nano Li2S is successfully entered into the NPCMs’ pores to form N-doped porous carbon microspheres–Li2S composite (NPCMs–Li2S) by a typical liquid infiltration–evaporation method. NPCMs–Li2S not only delivers a high initial discharge capacity of 1077 mAh g−1 at 0.2 A g−1, but also displays good rate capability of 198 mAh g−1 at 5.0 A g−1 and long-term lifespan over 500 cycles. The improved cycling and high-rate performance of NPCMs–Li2S can be attributed to the NPCMs’ host, realizing the strong fixation of LiPSs and enhancing the electron and charge conduction of Li2S in NPCMs–Li2S cathodes.

Facile formation of a nanostructured NiP2@C material for advanced lithium-ion battery anode using adsorption property of metal–organic framework

2016 ◽  
Vol 4 (24) ◽  
pp. 9593-9599 ◽  
Author(s):  
Gaihua Li ◽  
Hao Yang ◽  
Fengcai Li ◽  
Jia Du ◽  
Wei Shi ◽  
...  
Keyword(s):  
Adsorption Property ◽  
Metal Organic Framework ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Lithium Storage ◽  
Metal Organic ◽  
High Rate Performance ◽  
Battery Anode

Utilizing the adsorption properties of MOFs, a nanostructured NiP2@C was successfully synthesized, which exhibited enhanced capability for lithium storage in terms of both the reversible specific capacity and high-rate performance.

An artificial sea urchin with hollow spines: improved mechanical and electrochemical stability in high-capacity Li–Ge batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 5812-5816 ◽  
Author(s):  
Jinyun Liu ◽  
Xirong Lin ◽  
Tianli Han ◽  
Qianqian Lu ◽  
Jiawei Long ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Sea Urchin ◽  
Specific Capacity ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Electrochemical Stability ◽  
High Rate ◽  
High Rate Capability ◽  
High Specific Capacity

Metallic germanium (Ge) as the anode can deliver a high specific capacity and high rate capability in lithium ion batteries.

Facile Synthesis of Tremella-Like Li3V2(PO4)3/C Composite Cathode Materials Based on Oroxylum for Use in Lithium-Ion Batteries

2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
X Ray ◽  
Transmission Electron

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.

Hydrothermal Synthesis and Electrochemical Behavior of the SnO2/rGO as Anode Materials for Lithium-Ion Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7034-7038 ◽  
Author(s):  
Mookala Premasudha ◽  
Bhumi Reddy Srinivasulu Reddy ◽  
Ki-Won Kim ◽  
Nagireddy Gari Subba Reddy ◽  
Jou-Hyeon Ahn ◽  
...  
Keyword(s):  
Anode Materials ◽  
Storage Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Volume Changes ◽  
Long Cycle Life ◽  
Initial Discharge ◽  
Ion Storage ◽  
High Rate Performance

In this work, the hydrothermal method was employed to produce SnO2/rGO as anode material. Nanostructured SnO2 was prepared to enhance reversibility and to deal with the undesirable volume changes during cycling. The SnO2/rGO hybrid exhibits long cycle life in lithium-ion storage capacity and rate capability with an initial discharge capacity of 1327 mAh/g at 0.1 C rate. These results demonstrate that a fabricated SnO2/rGO matrix will be a possible way to obtain high rate performance.

scholarly journals High Tap Density SphericalLi[Ni0.5Mn0.3Co0.2]O2Cathode Material Synthesized via Continuous Hydroxide Coprecipitation Method for Advanced Lithium-Ion Batteries

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Shunyi Yang ◽  
Xianyou Wang ◽  
Xiukang Yang ◽  
Ziling Liu ◽  
Qiliang Wei ◽  
...  
Keyword(s):  
Size Distribution ◽  
Photoelectron Spectroscopy ◽  
Rate Capability ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Voltage Range ◽  
X Ray ◽  
Tap Density ◽  
Plate Shape ◽  
Hydroxide Coprecipitation

Spherical[Ni0.5Mn0.3Co0.2](OH)2precursor with narrow size distribution and high tap density has been successfully synthesized by a continuous hydroxide coprecipitation, andLi[Ni0.5Mn0.3Co0.2]O2is then prepared by mixing the precursor with 6% excessLi2CO3followed by calcinations. The tap density of the obtainedLi[Ni0.5Mn0.3Co0.2]O2powder is as high as 2.61 g cm−3. The powders are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), particle size distribution (PSD), and charge/discharge cycling. The XRD studies show that the preparedLi[Ni0.5Mn0.3Co0.2]O2has a well-ordered layered structure without any impurity phases. Good packing properties of spherical secondary particles (about 12 μm) consisted of a large number of tiny-thin plate-shape primary particles (less than 1 μm), which can be identified from the SEM observations. In the voltage range of 3.0–4.3 V and 2.5–4.6 V,Li[Ni0.5Mn0.3Co0.2]O2delivers the initial discharge capacity of approximately 175 and 214 mAh g−1at a current density of 32 mA g−1, and the capacity retention after 50 cycles reaches 98.8% and 90.2%, respectively. Besides, it displays good high-temperature characteristics and excellent rate capability.

Synthesis of MoO3/V2O5/C Composite as Novel Anode for Li-Ion Battery Application

2020 ◽  
Vol 20 (5) ◽  
pp. 2911-2916
Author(s):  
Zhen Zhang ◽  
Xiao Chen ◽  
Guangxue Zhang ◽  
Chuanqi Feng
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Li Ion ◽  
Battery Application

The MoO3/V2O5/C, MoO3/C and V2O5/C are synthesized by electrospinning combined with heat treatment. These samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and thermogravimetric analysis (TG) techniques. The results show that sample MoO3/V2O5/C is a composite composed from MoO3, V2O5 and carbon. It takes on morphology of the nanofibers with the diameter of 200~500 nm. The TG analysis result showed that the carbon content in the composite is about 40.63%. Electrochemical properties for these samples are studied. When current density is 0.2 A g−1, the MoO3/V2O5/C could retain the specific capacity of 737.6 mAh g−1 after 200 cycles and its coulomb efficiency is 92.99%, which proves that MoO3/V2O5/C has better electrochemical performance than that of MoO3/C and V2O5/C. The EIS and linear Warburg coefficient analysis results show that the MoO3/V2O5/C has larger Li+ diffusion coefficient and superior conductivity than those of MoO3/C or V2O5/C. So MoO3/V2O5/C is a promising anode material for lithium ion battery application.

scholarly journals Electrospinning synthesis of 3D porous NiO nanorods as anode material for lithium-ion batteries

2016 ◽  
Vol 34 (2) ◽  
pp. 227-232 ◽  
Author(s):  
Xiang Wei Kong ◽  
Rong Liang Zhang ◽  
Sheng Kui Zhong ◽  
Ling Wu
Keyword(s):  
Anode Material ◽  
Specific Capacity ◽  
3D Structure ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Metallic Nickel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrospinning Method ◽  
A Current

AbstractThree-dimensional NiO nanorods were synthesized as anode material by electrospinning method. X-ray diffraction results revealed that the product sintered at 400 °C had impure metallic nickel phase which, however, became pure NiO phase as the sintering temperature rose. Nevertheless, the nanorods sintered at 400, 500 and 600 °C had similar diameters (∼200 nm).The NiO nanorod material sintered at 500 °C was chip-shaped with a diameter of 200 nm and it exhibited a porous 3D structure. The nanorod sintered at 500 °C had the optimal electrochemical performance. Its discharge specific capacity was 1127 mAh·g−1 initially and remained as high as 400 mAh·g−1 at a current density of 55 mA·g−1 after 50 cycles.

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