Optimal Charge and Discharge Capacity Effects of the Sintering Process on LiMn2O4 by the Solid-State Reaction Method

2013 ◽  
Vol 377 ◽  
pp. 141-145 ◽  
Author(s):  
Yen Chun Liu ◽  
Mao Chieh Chi ◽  
Ming Cheng Liu
Keyword(s):  
Solid State ◽  
Discharge Capacity ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Discharge Voltage ◽  
Operating Voltage ◽  
Initial Discharge Capacity ◽  
Sintering Process ◽  
Charge Voltage ◽  
Initial Discharge

This study investigates the optimal charge and discharge capacity of the sintering process on the lithium battery spinel - LiMn2O4. Both Li2CO3 and Mn3O4 are utilized to synthesize the cathode material LiMn2O4 using the solid-state reaction. Cathode materials are processed to fabricate batteries at temperatures ranging from 800°C to 900°C. Test results reveal that the highest initial discharge capacity of 105.19 mAhg-1 (theoretically at 148 mAhg-1) has been obtained at the temperature of 850°C in the sintering process for synthesis of LiMn2O4. In addition, the initial discharge capacity can be increased to 140.51 mAhg-1 with both overdosing the amount of lithium by 2% and increasing the range of operating voltage. The increasing of the charge voltage ranges from 4.5V to 4.8V and reducing of the discharge voltage ranges from 3.0V to 2.8V.

scholarly journals Synthesis and Electrochemical Properties of Lithium Titanate Anode Materials Powders by Solid State Reaction of Li and Spherical TiO2 Powders

2011 ◽  
Vol 485 ◽  
pp. 119-122
Author(s):  
Motofumi Yamada ◽  
Hiroshi Kawaguchi ◽  
Takayuki Kodera ◽  
Takashi Ogihara
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Spinel Structure ◽  
Anode Materials ◽  
Lithium Titanate ◽  
Initial Discharge Capacity ◽  
Composite Powders ◽  
Particle Characteristics ◽  
Initial Discharge ◽  
Acid Aqueous Solution

Li4Ti5O12 powders were synthesized by solid state reaction of Li2CO3 and spherical composite powders of carbon and TiO2 (denoted as C/TiO2). C/TiO2 powders were synthesized by spray pyrolysis of using lactic acid aqueous solution. The particle characteristics of Li4Ti5O12 powders were determined by SEM, XRD and DTA-TG. DTA-TG showed that the carbon content was around 8 wt% in Li4Ti5O12 powders. XRD revealed that the spinel structure (Fd3m) was obtained by heating at 750 °C under N2 atmosphere. The first rechargeable capacity of Li4Ti5O12 anode was about 160 mAh/g at 1 C. That of Li4Ti5O12 anode decreased to 90 mAh/g at 20 C. The rechargeable capacity of Li4Ti5O12 anode decreased with increasing the rechargeable rate, but 81% of initial discharge capacity of Li4Ti5O12 anode was retained after 200 cycles at 1C

On Improving the Cycling Stability of P2-Type Na0.67Ni0.33Mn0.67O2 Cathode Material By Ti-Substitution for Na-Ion Batteries

2019 ◽  
Author(s):  
Debanjana Pahari ◽  
Sreeraj Puravankara
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Synthesis Method ◽  
Cycling Stability ◽  
Solid State Synthesis ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Ti Substitution ◽  
Solid State Synthesis Method

A novel cathode material with Ti-substitution on Ni site, P2-type Na0.67Ni0.25Ti0.08Mn0.67O2 has been synthesized via solid-state synthesis method and characterized electrochemically. Na0.67Ni0.25Ti0.08Mn0.67O2 electrodes have been observed tobe highly reversible at higher voltage ranges. The electrodes have an initial discharge capacity of 125 mAhg-1and can retain around 84% of this capacity (105 mAhg-1) even after 50 cycles at 0.1C when cycled at an uppercut-off voltage of 4.3 V. Na0.67Ni0.25Ti0.08Mn0.67O2 electrodes are believed to suppress the irreversible P2-O2 transformation by diverting the charging reaction through a more reversible P2-OP4transition.

scholarly journals A novel low-temperature solid-state route for nanostructured cubic garnet Li7La3Zr2O12 and its application to Li-ion battery

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62656-62667 ◽  
Author(s):  
P. Jeevan Kumar ◽  
K. Nishimura ◽  
M. Senna ◽  
A. Düvel ◽  
P. Heitjans ◽  
...  
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Discharge Capacity ◽  
Li Ion Battery ◽  
Initial Discharge Capacity ◽  
Solid State Route ◽  
Initial Discharge ◽  
Model Cell ◽  
Li Ion

Garnet Li7La3Zr2O12 nanoparticles with 1 mass% Al were prepared via a solid-state route at 750 °C within 3 h. A model cell sandwiched by Li and LiCoO2 exhibited initial discharge capacity of 64 μA h cm−2 μm−1, being 93% of LiCoO2 theoretical value.

Preparing LiFePO4 Using Recovered Materials from Waste Li-Ion Battery

2013 ◽  
Vol 726-731 ◽  
pp. 2940-2944 ◽  
Author(s):  
Feng Pei ◽  
Yue Wu ◽  
Wen Hua Zhang ◽  
Xu Tian ◽  
Ji Yu
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Raw Material ◽  
Molar Ratio ◽  
Li Ion Battery ◽  
Optimal Conditions ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Li Ion

LiFePO4 was prepared using recovered materials from waste Li-ion battery. The recovered materials after treatment was mixed with Li2CO3, Fe (NO3) 3·9H2O and NH4H2PO4 to adjust the Li/Fe/P molar ratio equal to 1.05/1/1. The raw material was mixed with super-p and calcined in muffle to get LiFePO4 by a solid-state reaction. Optimal conditions were: 700°C, N2 ambience, 10h, and Fe/C=1/1.5 (mol). The characterization results showed that the product was irregular particles with size 5-10μm and good dispersion. When discharged in the range of 2.2~4.2V, the initial discharge capacity was 141.4mAh/g at 0.1C, 103.1mAh/g at 1C. The capacity retention was 97.2% after 300 cycles at 1C showing satisfactory stability.

Microstructure and Electrochemical Properties of Lithium Titanate Particles Prepared by Solid State Reaction of Li and Spherical TiO2 Powders

2013 ◽  
Vol 566 ◽  
pp. 107-110
Author(s):  
Motofumi Yamada ◽  
Hiroshi Kawaguchi ◽  
Takayuki Kodera ◽  
Takashi Ogihara
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Spinel Structure ◽  
Lithium Titanate ◽  
Carbon Composite ◽  
Initial Discharge Capacity ◽  
Cycle Stability ◽  
Composite Powders ◽  
Particle Characteristics ◽  
Initial Discharge

Li4Ti5O12 powders were synthesized via the solid state reaction of Li2CO3 and spherical composite powders of carbon and TiO2 (denoted by C/TiO2) with different microstructures. These C/TiO2 powders were synthesized by spray pyrolysis using various organic acid aqueous solutions. The particle characteristics of the resulting carbon composite Li4Ti5O12 (denoted by C/Li4Ti5O12) powders were determined using SEM, XRD, and DTA-TG. DTA-TG showed that the carbon content of all Li4Ti5O12 powders. was around 3 wt%. XRD revealed that the spinel structure (Fd3m) was obtained by heating at 750 °C under N2 atmosphere. The initial rechargeable capacity of the C/Li4Ti5O12 powders formed using citric acid was approximately 170 mAh/g at 1 C. The rechargeable capacity of the C/Li4Ti5O12 powders decreased with an increase in the rechargeable rate. The anodes maintained over 90% of their initial discharge capacity after 200 cycles at 1 C. The C/Li4Ti5O12 powders also demonstrated high cycle stability at 50 °C. It was found that rechargeable capacity was influenced by the particles microstructure, but cycle stability did not depend on the microstructure.

Fabrication and Properties of Zinc Silicate Phosphors through Solid State Reaction

2010 ◽  
Vol 160-162 ◽  
pp. 594-598
Author(s):  
Guo Jian Jiang ◽  
Jia Yue Xu ◽  
Hui Shen ◽  
Yan Zhang ◽  
Lin He Xu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Emission Peak ◽  
Zinc Silicate ◽  
Red Phosphor ◽  
Reaction Method ◽  
Long Afterglow ◽  
Luminescent Mechanism ◽  
Silicate Phosphors

Zinc silicate-based (Zn2SiO4:Eu3+) long afterglow phosphors were produced by solid state reaction method. The effects of borax and Eu2O3 additive on the properties of fabricated products have been studied. The results show that, there is not much difference in phase compositions within the borax additive amount; however, their SEM morphologies are different. Borax additive can increase the grain size of the product. Some sintering phenomena could be observed in the sample with Eu2O3 addition. The fluorescence spectroscopy results indicate that, the emission peak of the sample with Eu3+ additive located at 612nm, which may be a good candidate for red phosphor applications. The luminescent mechanism of Zn2SiO4:Eu3+ is also discussed.

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