Comprehensive Aging Analysis of Volumetric Constrained Lithium-Ion Pouch Cells with High Concentration Silicon-Alloy Anodes

Abstract

In this research, twenty-four high capacity (1360 mAh) NMC622/Si-alloy Li-ion full pouch cells with high silicon-alloy content (55%) are cycle aged under seven different cycling conditions to study the effect of different stressors on the cycle life of Si-anode full cells, among which are the effect of ambient temperature, Depth of Discharge (DoD) and the discharge current. The cells are volumetrically constrained at an optimal initial pressure to improve their cycle life, energy and power capabilities. Furthermore, the innovative test setup allows measuring the developed pressure as a result of repeated (de-)lithiation during battery cycling. This uniquely vast testing campaign on Si-anode full cells allows us to study and quantify independently the influence of different stress factors on their cycle life for the first time, as well as to develop a new capacity fade model based on an observed linear relationship between capacity retention and total discharge capacity throughput.

Characterization of the Compressive Load on a Lithium-Ion Battery for Electric Vehicle Application

“…An understandable interdependence could be distinguished among pressure behavior and the capacity retention of the Si-alloy cells. The aforementioned indicates some correspondence among the principal aging mechanism between their irreversible pressure increase and Si-alloy cells [6].…”

“…In total, 24 giant capacity lithium-ion battery cells with great silicon content were cycle under seven dissimilar cycling situations to investigate the consequence of dissimilar stimulus on the life cycle of Si-anode full battery cells [6]. The impact of different factors was considered, such as the discharge current, depth of discharge, and ambient temperature.…”

Study of the Binder Influence on Expansion/Contraction Behavior of Silicon Alloy Negative Electrodes for Lithium-Ion Batteries

“…Although in situ electrochemical dilatometry provides in depth information on the time-resolved volume changes of the electrodes, in the current dilatometer there is no stacking pressure that is present in a practical coin cell, which might cause an overestimation of the electrode thickness. 3,[12][13][14][15] While ex situ cross-sectional SEM approach enables a visual observation of the volume changes, it was carried out from recovered (i.e. disassembled, washed, and dried) and relaxed (i.e.…”

Effect of the Pillar Size on the Electrochemical Performance of Laser-Induced Silicon Micropillars as Anodes for Lithium-Ion Batteries

“…Ever since Sony Corporation first commercialized lithium-ion batteries (LIBs) in 1991, LIBs have played a critical role in enabling the emergence of electric vehicles (EVs) and the widespread availability of portable electronic devices such as laptops, smartphones, and video cameras [1][2][3][4][5][6][7]. However, graphite, as the anode material of traditional LIBs, has almost reached its performance limit for energy storage, and therefore increasing the specific capacity of the anode material remains a challenge [8][9][10][11][12][13][14].…”