Composite FeF3•3H2O/C Cathode Material for Lithium Ion Battery

2011 ◽  
Vol 391-392 ◽  
pp. 1090-1094 ◽  
Author(s):  
Chuan Wu ◽  
Xiao Xiao Li ◽  
Feng Wu ◽  
Ying Bai ◽  
Mi Zi Chen ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Energy ◽  
Phase Method ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Voltage Range ◽  
Liquid Phase Method ◽  
Cyclic Voltammetery

Composite FeF3•3H2O/C was prepared by mixing FeF3•3H2O with acetylene black through high-energy milling, and used as cathode material for Li-ion battery. The structure and the morphology of the as-prepared composite FeF3•3H2O/C were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). When compared with FeF3•3H2O synthesized by a liquid-phase method, the composite FeF3•3H2O/C had no distinct difference in crystal structure, but shows that a well distributed particle size of 100~1000nm. The electrochemical performances of FeF3•3H2O/C composite were evaluated by charge-discharge test and cyclic voltammetery (CV). With a current density of 23.7mAg-1 in the voltage range of 2.0~4.5V at room temperature, the FeF3•3H2O/C composite achieved a maximum discharge capacity of 112 mAhg-1, as well as a good cycling performance.

Electrochemical Performances of Li4Ti5-xAlxO12 (x=0.03, 0.05, 0.10) as Anode Materials for Lithium Ion Battery

2013 ◽  
Vol 750-752 ◽  
pp. 1791-1794
Author(s):  
Fang Gu
Keyword(s):  
Anode Materials ◽  
Solution Method ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Negative Influence ◽  
Electrochemical Process ◽  
Electrochemical Performances ◽  
X Ray Diffraction

Li4Ti5-xAlxO12(x=0.03, 0.05, 0.10) were prepared by a solution method. The electrochemical performances including charge-discharge and AC impedance were investigated. The structure of the samples were characterized by X-ray diffraction. The results revealed that proper Al doped into Li4Ti5O12would not change or destroy the crystal structure. Li4Ti5-xAlxO12(x=0.03, 0.05) had better capacity than Li4Ti5O12, because of the decrease of electric resistance. But when the quality percent of Al was too big, it will bring negative influence to Li4Ti5O12. Al3+doping did not change the electrochemical process, instead enhanced the electronic conductivity and ionic conductivity. The reversible capacity and cycling performance were effectively improved.

Synthesis and Electrochemical Properties of LiFe (PO4)(1-x/3)Fx/C as a Cathode Material

2013 ◽  
Vol 827 ◽  
pp. 16-19
Author(s):  
Shi Tao Song ◽  
Su Xia Wu ◽  
Zhi Wei Zhang ◽  
You Shun Peng
Keyword(s):  
Cathode Material ◽  
Effective Means ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Constant Current ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Constant Current Charge ◽  
Discharge Experiment

on doping is an effective means to improve the performance of LiFePO4 material. In the present study, composites LiFe (PO4)(1-x/3)Fx/C (x=0.00,0.02,0.04,0.06,0.08,0.10) were synthesized by carbothermal reduction method. The as-synthesized samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated by constant current charge-discharge experiment. The results indicated that the low concentration F dopant did not affect the structure of LiFePO4 but considerable improved its electrochemical performances. The LiFe (PO4)0.98F0.06/C materials showed better electrochemical performances than LiFePO4/C. At 0.2 C discharging rate, the LiFe (PO4)0.98F0.06/C materials was capable of delivering reversible specific capacity of 165.1 mAh/g, with fairly stable cycleability. The excellent performance indicates that this mix-doped composite was a very promising cathode material for lithium ion batteries.

Controlling the Precursor Morphology of Ni-Rich Li(Ni0.8Co0.1Mn0.1)O2 Cathode for Lithium-Ion Battery

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950103
Author(s):  
Wen-Zhe Shen ◽  
Yi Ma ◽  
Yao-Chun Yao ◽  
Feng Liang
Keyword(s):  
Cathode Material ◽  
Coulombic Efficiency ◽  
Low Cost ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Bath Temperature ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Performances ◽  
Experimental Conditions

Ni-rich Li(Ni[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 cathode material is widely recognized as one of the most cathode materials for lithium-ion batteries due to its high specific capacity, high energy density and low cost. In this paper, the NCM cathode material precursor Ni[Formula: see text]Co[Formula: see text]Mn[Formula: see text](OH)2 was prepared by coprecipitation method and the optimum experimental conditions were investigated. The effects of water bath temperature on the electrochemical performances of the prepared materials were investigated by controlling the morphology. The results showed that 60∘C was the best bath temperature for the precursor which has a regular spheroidal morphology and uniform particles with the diameter of 10[Formula: see text][Formula: see text]m. After coprecipitation, the samples calcined under oxygen atmosphere displayed good electrochemical properties. The discharge specific capacity is up to 194[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]h[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] and 134[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]h[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] at 0.2∘C and 5∘C, respectively. The initial coulombic efficiency is 87.57% at 0.2∘C.

scholarly journals Preparation and Electrochemical Properties of LiNi2/3Co1/6Mn1/6O2 Cathode Material for Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1766
Author(s):  
Meijie Zhu ◽  
Jiangang Li ◽  
Zhibei Liu ◽  
Li Wang ◽  
Yuqiong Kang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Particle Morphology ◽  
Phase Method ◽  
Voltage Range ◽  
Calcination Temperatures ◽  
Excellent Electrochemical Performance

The cathode material LiNi2/3Co1/6Mn1/6O2 with excellent electrochemical performance was prepared successfully by a rheological phase method. The materials obtained were characterized by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy and charge-discharge tests. The results showed that both calcination temperatures and atmosphere are very important factors affecting the structure and electrochemical performance of LiNi2/3Co1/6Mn1/6O2 material. The sample calcinated at 800 °C under O2 atmosphere displayed well-crystallized particle morphology, a highly ordered layered structure with low defects, and excellent electrochemical performance. In the voltage range of 2.8–4.3 V, it delivered capacity of 188.9 mAh g−1 at 0.2 C and 130.4 mAh g−1 at 5 C, respectively. The capacity retention also reached 93.9% after 50 cycles at 0.5 C. All the results suggest that LiNi2/3Co1/6Mn1/6O2 is a promising cathode material for lithium-ion batteries.

Electrochemical Performances of Li4-xKXTi5O12 (x=0.02, 0.04, 0.06) as Anode Materials for Lithium Ion Battery

2013 ◽  
Vol 712-715 ◽  
pp. 313-316 ◽  
Author(s):  
Gu Fang
Keyword(s):  
Anode Materials ◽  
Solution Method ◽  
Discharge Rate ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Electrochemical Process ◽  
Electrochemical Performances ◽  
X Ray Diffraction

Li4-xKxTi5O12 (x=0.02, 0.04, 0.06) were prepared via a solution method. The electrochemical performances including charge-discharge, rate property and cyclic voltammety were also investigated. The structure of the samples were characterized by X-ray diffraction. The results revealed that Li3.96K0.04Ti5O12 was well. K+ doping did not change the electrochemical process, instead enhanced the electronic conductivity and ionic conductivity. The reversible capacity and cycling performance were effectively improved.

Synthesis and Characterization of LiVOPO4 Cathode Material by Solid-State Method

2012 ◽  
Vol 554-556 ◽  
pp. 436-439 ◽  
Author(s):  
An Ping Tang ◽  
Ze Qiang He ◽  
Jie Shen ◽  
Guo Rong Xu
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Lithium Ion ◽  
Chemical Diffusion ◽  
Chemical Diffusion Coefficient ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
X Ray ◽  
State Method

Lithium vanadyl phosphate (β-LiVOPO4) cathode material for lithium ion batteries was prepared via a novel solid state method. The microstructure and electrochemical properties of the sample were characterized by X-ray diffraction, scanning electron microscopy, galvanostatically discharge/discharge and cyclic voltammetry techniques, respectively. X-ray diffraction patterns showed that β-LiVOPO4 has an orthorhombic structure with space group of Pnma. The discharge capacity of LiVOPO4 sample is 89.9 mAh•g-1 in the first cycle, and in the 50th cycle it is 76.2 mAh•g-1 at the current density of 10 mA•g-1 between 3.0-4.5 V. The chemical diffusion coefficient ( ) value determined from CV is about 10-11 cm2 s-1. Experimental results indicate that further efforts are needed to improve electrochemical performances of LiVOPO4 material synthesized by solid state method; however, it has a higher discharge plateau around 3.9 V.

Research Progress in Modification of Nickel-Rich Ternary Cathode Material LiNi0.8Co0.1Mn0.1O2 for Lithium Ion Batteries

2021 ◽  
Vol 1033 ◽  
pp. 126-130
Author(s):  
Xue Zhi Ma ◽  
Hong Ru Zhu ◽  
Zhi Li Xie ◽  
Jie Ding ◽  
Chun Li Li
Keyword(s):  
Energy Density ◽  
Cathode Material ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Research Progress ◽  
Commercial Application ◽  
Electrochemical Performances ◽  
Synthesis Methods ◽  
High Nickel

In order to increase the energy density of lithium-ion battery, the LiNi0.8Co0.1Mn0.1O2(NCM811) cathode material with higher Ni content has attracted much attention due to its advantages such as high energy density, low cost. However, there are some bottleneck problems about the NCM811 such as capacity fading, harsh storage conditions, poor thermal stability, poor safety, which limit its large-scale commercial use. This article reviews the urgent problems for NCM811 high nickel ternary materials, briefly describes several common synthesis methods, and focuses on the modification methods, such as element doping, surface coating and special core-shell structure for enhancing the electrochemical performances and explain the modification mechanism. Finally, we prospect the possible research development and commercial application of high nickel ternary material.

Study of Circulation of Reaction Liquid in Liquid Phase Synthesis of LiFePO4 as Cathode Material

2015 ◽  
Vol 1120-1121 ◽  
pp. 128-131
Author(s):  
Jun Jun Ma ◽  
Jia Zhou ◽  
Xue Min Zu ◽  
Xing Yao Wang
Keyword(s):  
Liquid Phase ◽  
Cathode Material ◽  
Raw Materials ◽  
Lithium Ion ◽  
Phase Method ◽  
Capacity Retention ◽  
Phase Synthesis ◽  
Initial Discharge ◽  
Liquid Phase Method ◽  
Lifepo4 Cathode

LiFePO4 as cathode materials for lithium-ion battery were prepared by a liquid-phase method which utilizes FeSO4•7H2O, NH4H2PO4, H2O2, CH3COOLi and glucose as raw materials. The aqueous can be directly used in the synthesis of FePO4•xH2O without any treatment and the ethanol should be distilled before the synthesis of LiFePO4. The result showed that the high purity of FePO4•xH2O can be achieved even prepared with the aqueous which was used for five times. LiFePO4 cathode material prepared with the distilled ethanol exhibited the best initial discharge capacity of 156.3 mAh•g-1 and the capacity retention ratio 99.49% after 30 cycles at 0.1 C rate.

Physical and Electrochemical Properties of a Mixed Lithium Phosphate as Cathode Material for Lithium Ion Battery

2012 ◽  
Vol 535-537 ◽  
pp. 2083-2086
Author(s):  
Hui Xie ◽  
Jian Zhuang Liu
Keyword(s):  
Cathode Material ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
High Rate ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Lithium Phosphate ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Electrochemical Capacity

A mixed lithium phosphate LiMn0.6Fe0.4PO4 as cathode material for lithium ion battery was synthesized by solid-state reaction. The crystalline structure, morphology of particles and electrochemical performances of the sample were investigated by X-ray diffraction, scanning electron microscopy, charge-discharge test and cyclic voltammetry. The results show that the small LiMn0.6Fe0.4PO4 particles are simple pure olive-type phase structure with uniformly distribution of gain size. The LiMn0.6Fe0.4PO4 obtained has a high electrochemical capacity, good cycle ability and excellent stability under high temperature. However, the capacity loss corresponding to 4.0V plateau at high rate, which had been proved by various electrochemical tests, is the main obstacle to its practical application.

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