Power characteristics of spinel cathodes correlated with elastic softness and phase transformation for high-power lithium-ion batteries

2017 ◽  
Vol 5 (7) ◽  
pp. 3404-3411 ◽  
Author(s):  
Jin-Myoung Lim ◽  
Rye-Gyeong Oh ◽  
Woosuk Cho ◽  
Kyeongjae Cho ◽  
Maenghyo Cho ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Electrochemical Properties ◽  
Phase Transformations ◽  
Lithium Ion Batteries ◽  
High Power ◽  
Lithium Ion ◽  
Transformation Kinetics ◽  
Power Characteristics ◽  
Phase Transformation Kinetics ◽  
Mechanical Deformations

We present the phase transformation kinetics associated with mechanical deformations and electrochemical properties of LiNi0.5Mn1.5O4 (LNMO) and LiNi0.5Mn1.5−xTixO4 (LNMTO) that elucidate the correlation between power characteristics, mechanical deformations, and phase transformations.

Modeling Phase Transformation Kinetics and Their Effect on Hardness and Hardness Depth in Laser Hardening of Hypoeutectoid Steel

2015 ◽  
Author(s):  
Suhash Ghosh ◽  
Chittaranjan Sahay
Keyword(s):  
Thermal Analysis ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Laser Hardening ◽  
Temperature History ◽  
Transformation Kinetics ◽  
Continuous Cooling ◽  
Phase Transformation Kinetics ◽  
Hardness Depth ◽  
Hypoeutectoid Steel

Much research has been done to model laser hardening phase transformation kinetics. In that research, assumptions are made about the austenization of the steel that does not translate into accurate hardness depth calculations. The purpose of this paper is to develop an analytical method to accurately model laser hardening phase transformation kinetics of hypoeutectoid steel, accounting for non-homogeneous austenization. The modeling is split into two sections. The first models the transient thermal analysis to obtain temperature time-histories for each point in the workpiece. The second models non-homogeneous austenization and utilizes continuous cooling curves to predict microstructure and hardness. Non-homogeneous austenization plays a significant role in the hardness and hardness depth in the steel. A finite element based three-dimensional thermal analysis in ANSYS is performed to obtain the temperature history on three steel workpieces for laser hardening process with no melting; AISI 1030, 1040 and 1045 steels. This is followed by the determination of microstructural changes due to ferrite and pearlite transformation to austenite during heating and the subsequent austenite to martensite and other diffusional transformations during cooling. Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation is used to track the phase transformations during heating, including the effects of non-homogenous austenitization. The solid state nodal phase transformations during cooling are monitored on the material’s digitized Continuous Cooling Transformation (CCT) curve through a user defined input file in ANSYS for all cooling rates within the Heat Affected Zone (HAZ). Material non-linearity is included in the model by including temperature dependent thermal properties for the material. The model predictions for hardness underneath the laser and the HAZ match well with the experimental results published in literature.

Electrochemical properties of high-power lithium ion batteries made from modified spinel LiMn2O4

2009 ◽  
Vol 19 (6) ◽  
pp. 1494-1498 ◽  
Author(s):  
Xiang-qun LI ◽  
Zhi-xing WANG ◽  
Ru-fu LIANG ◽  
Hua-jun GUO ◽  
Xin-hai LI ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
High Power ◽  
Lithium Ion ◽  
Spinel Limn2o4

Synthesis and electrochemical properties of high power Li1+xV3O8 cathode materials for lithium-ion batteries

2021 ◽  
Vol 303 ◽  
pp. 122532
Author(s):  
Guoliang Bai ◽  
Wei Wei ◽  
Benqiu Wang ◽  
Chunhua Wang ◽  
Na Liu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
High Power ◽  
Cathode Materials ◽  
Lithium Ion

Effect of sodium additive on electrochemical properties of LiNi0.5 Mn1.5O4 for high-power lithium-ion batteries

2016 ◽  
Vol 6 (3) ◽  
pp. 259-264 ◽  
Author(s):  
Lili Liu ◽  
Enshan Han ◽  
Lingzhi Zhu ◽  
Yanjuan Kou ◽  
Zhongai Zhang
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
High Power ◽  
Lithium Ion

Structure and Electrochemical Properties of Si-Mn/C Core–Shell Composites for Lithium-Ion Batteries

JOM ◽  
2020 ◽  
Vol 72 (8) ◽  
pp. 3037-3045
Author(s):  
Shenggao Wang ◽  
Tao Wang ◽  
Yan Zhong ◽  
Quanrong Deng ◽  
Yangwu Mao ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Core Shell
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