Boosting Lithium-Ion Transport Kinetics by Increasing the Local Lithium-Ion Concentration Gradient in Composite Anodes of Lithium-Ion Batteries

2021 ◽  
Author(s):  
Weiwei Wu ◽  
Zhonggui Sun ◽  
Qiang He ◽  
Xingwang Shi ◽  
Xuhui Ge ◽  
...  
Keyword(s):  
Ion Transport ◽  
Lithium Ion Batteries ◽  
Concentration Gradient ◽  
Lithium Ion ◽  
Transport Kinetics ◽  
Ion Concentration ◽  
Composite Anodes

THE EFFECTS OF ELASTIC STIFFENING ON THE EVOLUTION OF THE STRESS FIELD WITHIN A SPHERICAL ELECTRODE PARTICLE OF LITHIUM-ION BATTERIES

2013 ◽  
Vol 05 (04) ◽  
pp. 1350040 ◽  
Author(s):  
WENBIN ZHOU ◽  
FENG HAO ◽  
DAINING FANG
Keyword(s):  
Stress Field ◽  
Lithium Ion Batteries ◽  
Internal Stress ◽  
Concentration Gradient ◽  
Concentration Field ◽  
Lithium Ion ◽  
Coupling Model ◽  
Ion Concentration ◽  
Hysteresis Phenomenon ◽  
Mechanical Coupling

Poor cyclic performance of lithium-ion batteries is calling for efforts to study its capacity attenuation mechanism. The internal stress field produced in the lithium-ion battery during its charging and discharging process is a major factor for its capacity attenuation, research on it appears especially important. We established an electrochemical –mechanical coupling model with the consideration of the influence of elastic stiffening on diffusion for graphite anode materials. The results show that the inner stress field strongly depends on the lithium-ion concentration field, greater concentration gradients lead to greater stresses. The evolution of the stress field is similar to that of the concentration gradient but lags behind it, which shows hysteresis phenomenon. Elastic stiffening can lower the concentration gradient and increase elastic modulus, which are two major factors influencing the inner stress field. We conclude that the latter is more dominant compared to the former, and elastic stiffening acts to increasing the internal stress.

Instant gelation synthesis of 3D porous MoS2@C nanocomposites for lithium ion batteries

Nanoscale ◽  
2014 ◽  
Vol 6 (7) ◽  
pp. 3664-3669 ◽  
Author(s):  
Ling Fei ◽  
Yun Xu ◽  
Xiaofei Wu ◽  
Gen Chen ◽  
Yuling Li ◽  
...  
Keyword(s):  
Ion Transport ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Fast Electron ◽  
Lithium Ion ◽  
Transport Kinetics ◽  
Excellent Stability

Instant gelation prepared porous MoS2@C nanocomposites show excellent electrochemical properties due to their excellent stability and fast electron and ion transport kinetics.

Uniform Nano-Sn/C Composite Anodes for Lithium Ion Batteries

Nano Letters ◽  
2013 ◽  
Vol 13 (2) ◽  
pp. 470-474 ◽  
Author(s):  
Yunhua Xu ◽  
Qing Liu ◽  
Yujie Zhu ◽  
Yihang Liu ◽  
Alex Langrock ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Composite Anodes

scholarly journals Insights into interfacial effect and local lithium-ion transport in polycrystalline cathodes of solid-state batteries

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Shuaifeng Lou ◽  
Qianwen Liu ◽  
Fang Zhang ◽  
Qingsong Liu ◽  
Zhenjiang Yu ◽  
...  
Keyword(s):  
Solid State ◽  
Ion Transport ◽  
Chemical Potential ◽  
Lithium Ion ◽  
Local Environment ◽  
Underlying Mechanism ◽  
Transport Kinetics ◽  
Potential Force ◽  
Interfacial Contact ◽  
Solid State Batteries

Abstract Interfacial issues commonly exist in solid-state batteries, and the microstructural complexity combines with the chemical heterogeneity to govern the local interfacial chemistry. The conventional wisdom suggests that “point-to-point” ion diffusion at the interface determines the ion transport kinetics. Here, we show that solid-solid ion transport kinetics are not only impacted by the physical interfacial contact but are also closely associated with the interior local environments within polycrystalline particles. In spite of the initial discrete interfacial contact, solid-state batteries may still display homogeneous lithium-ion transportation owing to the chemical potential force to achieve an ionic-electronic equilibrium. Nevertheless, once the interior local environment within secondary particle is disrupted upon cycling, it triggers charge distribution from homogeneity to heterogeneity and leads to fast capacity fading. Our work highlights the importance of interior local environment within polycrystalline particles for electrochemical reactions in solid-state batteries and provides crucial insights into underlying mechanism in interfacial transport.

Tailoring atomic distribution in micron-sized and spherical Li-rich layered oxides as cathode materials for advanced lithium-ion batteries

2016 ◽  
Vol 4 (20) ◽  
pp. 7689-7699 ◽  
Author(s):  
Peiyu Hou ◽  
Guoran Li ◽  
Xueping Gao
Keyword(s):  
Thermal Stability ◽  
Energy Density ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Concentration Gradient ◽  
Lithium Ion ◽  
Cycle Life ◽  
Layered Oxides ◽  
Long Cycle ◽  
Long Cycle Life

A concentration-gradient doping strategy is introduced into micron-sized spherical Li-rich layered oxides. As a result, they exhibit high volumetric energy density, long cycle life and enhanced thermal stability.

NANOSTRUCTURED SnO2/C COMPOSITE ANODES IN LITHIUM-ION BATTERIES

2003 ◽  
Vol 02 (04n05) ◽  
pp. 299-306 ◽  
Author(s):  
CHIEN-TE HSIEH ◽  
JIN-MING CHEN ◽  
HSIU-WEN HUANG
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Lithium Ion ◽  
Surface Characteristics ◽  
Carbon Surface ◽  
Cyclic Voltammograms ◽  
Composite Anodes ◽  
Sol Gel Synthesis

Nanostructured SnO 2/ C composites used as anode materials were prepared by sol–gel synthesis to explore electrochemical properties in lithium-ion batteries. Surface characteristics of the SnO 2/ C nanocomposite were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that nanocrystalline SnO 2/ C with a grain size of 20–50 nm was uniformly dispersed on the carbon surface. After nanocrytalline SnO 2 coated onto carbon, the discharge capacity showed an increase up to 23%, i.e., from 300 to 370 mAh/g at a current density of 0.6 mA/cm2. The nanocomposite anode can achieve a fairly stable discharge capacity and excellent Coulombic efficiency (>99.5%) over 50 cycles. Cyclic voltammograms indicated that the improvements on capacity and cycleability were due to reversible alloying of nanosized Sn and Li on carbon surface.

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