For the development of thick film graphite electrodes, a 3D battery concept is applied, which significantly improves lithium-ion diffusion kinetics, high-rate capability, and cell lifetime reduces mechanical tensions. Our current research indicates that architectures anode materials can prevent cells from capacity fading at high C-rates improve lifespan. further concepts, it important to scientifically understand influence laser-generated on lithium distribution during charging discharging...

In situ scanning electron microscopy (SEM) offers a good way to investigate the structural evolution during lithiation and delithiation processes. this paper, dynamical morphological of 3D-line-structured/unstructured Si/C composite electrodes was observed by in SEM. The investigation revealed microstructural origin large charge capacity for 3D-line-structured anodes. Based on proposed mechanism, coarse optimization anodes proposed. These results shed light unique advantages using an SEM...

To improve interface adhesion between anode film and Cu foil, ultrafast laser structuring was implemented to construct dot patterns with a variety of periodic spacing (25, 50, 75 µm) on foil. The microstructure electrochemical performance films coated those structured foils were characterized. It shown that adhesive force the electrodes increased as distance dots foil decreased. Comparison XRD wet slurries dried showed after drying in case 50 µm period most graphite particles aligned c-axis,...

Laser-assisted modification of metals, polymers or ceramics yields a precise adjustment wettability, biocompatibility tribological properties for broad range applications. Due to specific change surface topography on micro- and nanometer scale, new functional can be achieved. A rather scientific technical approach is the laserassisted structuring metallic current collector foils lithium-ion batteries. Prior thick film electrode coating processes, formation micro/nano-scaled topographies...

The 3D battery concept applied on silicon-graphite electrodes (Si/C) has revealed a significant improvement of performances, including high-rate capability, cycle stability, and cell lifetime. architectures provide free spaces for volume expansion as well additional lithium diffusion pathways into the electrodes. Therefore, degradation induced by change silicon active material can be significantly reduced, capability achieved. In order to better understand impact electrode rate process thick...

Recently, three-dimensional (3D) electrode architectures have attracted great interest for the development of lithium-ion micro-batteries applicable Micro-Electro-Mechanical Systems (MEMS), sensors, and hearing aids. Since commercial available are mainly limited in overall cell capacity by their footprint, new processing strategies increasing both electrochemical performance to be developed. In case such standard microbatteries, two-dimensional (2D) arrangements applied with thicknesses up...

Laser processes for cutting, modification and structuring of energy storage materials such as electrodes, separator current collectors have a great potential in order to minimize the fabrication costs increase performance operational lifetime high power lithium-ion-batteries applicable stand-alone electric devices vehicles. direct patterning battery enable rather new technical approach adjust 3D surface architectures porosity composite electrode LiCoO₂,...

Lithium-ion batteries became the most promising types of mobile energy storage devices due to their high gravimetric and volumetric capacity, cycle life-time, low self-discharge. Nowadays, cathode material lithium nickel manganese cobalt oxide (NMC) is one widely used in commercial lithium-ion many advantages such as density (>150 Wh kg^-1) on cell level, power (650 W kg-1 @ 25 °C 50 % Depth Discharge) [1], specific capacity (163 mAh g^-1) [2], rate capability good...

For next generation of high energy lithium-ion batteries, silicon as anode material is great interest due to its higher specific capacity (3579 mAh/g). However, the volume change during de-/intercalation lithium-ions can reach values up 300 % causing particle pulverization, loss electrical contact and even delimitation composite electrode from current collector. In order overcome these drawbacks for anodes we are developing new 3D architectures. Laser nano-structuring collectors developed...

NMC thick films were prepared by tape-casting and subsequent ultrafast laser-structuring. The lithium distribution in electrochemically cycled unstructured or fs laser-structured cathodes was investigated using Laser-Induced Breakdown Spectroscopy (LIBS). main goal is to develop an optimized three dimensional cell architecture with improved electrochemical properties based on studies of the homogeneity local State-of-Charge. LIBS experiments carried out a workstation equipped mode-locked...

Lithium nickel manganese cobalt oxide (Li(Ni_1/3Mn_1/3Co_1/3)O₂, NMC) thick film electrodes were manufactured by using the doctor-blade technique (tape-casting). Ultrafast laser-structuring was performed in order to improve electrochemical performance. For this purpose, three-dimensional (3D) micro-structures such as free standing micropillars generated NMC cathodes femtosecond laser ablation. Laser-induced breakdown spectroscopy (LIBS) used for...

Laser-assisted modification of metals, polymers or ceramics yields a precise adjustment wettability, bio-compatibility tribological properties for broad range applications. Two types advanced laser processing technologies - direct interference patterning and ultrafast laser-induced periodic surface structuring were applied in this study. Formation structures on metallic substrate was investigated systematically as function wavelength, pulse duration, fluence scanning speed. Line-like...

Graphite anode material is commonly used in lithium-ion batteries. Due to the demand for a significantly increased energy density xEVs (electromotive vehicles), there worldwide strong effort add nano-sized silicon particles composite graphite electrodes. Silicon has benefit provide one order of magnitude higher gravimetrical than graphite. However, bottleneck its huge volume expansion about 300 % during electrochemical cycling which induces high compressive stress and subsequent film...

The well-known drawbacks of silicon-based anode materials are the huge volume change resulting in film cracking, delamination and pulverization active material. In order to reduce mechanical stress improve adhesion, free-standing structures modified current collector surfaces were generated by applying ultrafast laser processing. Freestanding on pure silicon silicon-doped graphite electrodes. Specific capacities measured galvanostatic cycling as function C-rate. It could be shown that can...

In order to increase the practical capacity of standard graphite anode and overcome drawbacks pure silicon material due its large volume change, electrodes mixed with nanoparticles are under development. this work, various types anodes 10 wt% were fabricated in view film thickness mixing ratio binder materials. Additionally, free-standing structures generated on silicon/graphite by applying ultrafast laser ablation. The mechanical stress within can be significantly reduced means artificial...

The formation of laser-induced periodic surface structures (LIPSS) on metallic surfaces by femtosecond laser radiation was investigated. Various types LIPSS could be formed such as copper and stainless steel. Nano-ripple investigated function scanning speed, pulse number, fluence. Hierarchical were generated steel hydrophobic properties with water contact angles about 145° achieved. It shown that direct processing is a perfect tool for designing micro- nanometer scale which can used optical,...

Laser-Induced Breakdown Spectroscopy (LIBS) was applied in order to investigate the elemental composition laser modified battery materials. In a first approach, thick film electrodes — all incorporating same active material (lithium nickel manganese cobalt oxide (Li(Ni1/3Mn1/3Co1/3)O2, NMC)) were manufactured using tape-casting technique. further femtosecond (fs) radiation used for generation of three dimensional (3D) micro-structures. 3D micro-grids successfully implemented into applying...

The porosity in composite electrode materials can vary on micro-and nanometer scale and has a great impact electrochemical performance lithium-ion cells. Liquid electrolyte to penetrate into the entire porous electrodes order enable diffusion. For studying of variations lithium-nickel-manganese-cobalt-oxide thick films (Li(Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1/3</sub> Mn Co )O xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ,...

Lithium-ion batteries (LIB) using lithium nickel manganese cobalt oxide (Li(Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1/3</sub> Mn Co )O xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , NMC-111) as cathode material have already become one of the most important types mobile power sources due to their high gravimetric and volumetric capacity. Nevertheless, automotive industry needs with a further improved energy density develop...