The effect of compressive stresses on a silicon electrode’s cycle life in a Li-ion battery

Ratyński, Maciej; Hamankiewicz, Bartosz; Krajewski, Michał; Boczar, Maciej; Czerwiński, A.

doi:10.1039/c8ra02456a

Cited by 26 publications

(22 citation statements)

References 23 publications

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“…The current density values for Li 2 MnSiO 4 /C composites increased together with the amount of sucrose added into the reactor chamber, suggesting enhanced kinetics of lithium insertion/extraction reaction into/out of lithiummanganese orthosilicate grains. This effect supports findings from galvanostatic charge/discharge test and is related to the enhanced conductivity of LMS electrodes, suggesting an increase in their electrochemically active surface area [10,[26][27][28][29].…”

Section: Electrochemistrysupporting

confidence: 87%

Structure, Morphology, and Electrochemical Properties of Carbon-Coated Lithium-Manganese Orthosilicate with Sucrose as a Carbon Source

et al. 2020

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Lithium-manganese orthosilicate powders were synthesized via a modified solvothermal method. Three different weight ratios of sucrose used as a carbon source were investigated for finding an effective carbon coating process. Synthesized materials were analyzed by structural and morphological (X-ray powder diffraction, scanning electron microscopy, N 2 adsorption/desorption, thermogravimetry analysis) and electrochemical (chronopotentiometry, cyclic voltammetry) methods. By increasing the sucrose content, the electrochemical performance improvement of lithium-manganese orthosilicate powder was observed, such as an increase in its specific capacity (132%) and cyclability (5%) compared with uncoated sample. The enhancement in Li 2 MnSiO 4 performance is related to an increase in its electrical conductivity and enlargement in the electrochemically active surface area due to carbon coating process.

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Section: Electrochemistrysupporting

confidence: 87%

Structure, Morphology, and Electrochemical Properties of Carbon-Coated Lithium-Manganese Orthosilicate with Sucrose as a Carbon Source

et al. 2020

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“…In case of Li-ion electrodes, the CT resistance is often one of the major limiting factors. [40,[46][47][48] The overpotential increasement leads to conditions, where Equation 3is no longer valid. The current-overpotential relation is then described by exponential relation from the Butler-Volmer equation.…”

Section: R T F Zmentioning

confidence: 99%

“…As a result, the only factor responsible for the observed different CT (DC ¼ 6 0) behavior was a local ion concentration close to the grain surface [Eq. (6)]. This local lithium concentration gradient is affected by the DC current density, which is directly related to the ECSA.…”

Section: Experimental Evaluationmentioning

confidence: 99%

“…Silicon has the highest specific capacity of all known alloy-type anode materials and it is close to 3570-4200 mAh/g (~1860 mAh/g when lithium mass is included). [5,6] It also presents the lowest specific volume change per charge unit~0.08 % g/mAh, even though, the total volume change may exceed 290 % during the full silicon lithiation. This results in fast mechanical degradation of the electrode macrostructure, as well as individual grain pulverization and cracking.…”

Section: Introductionmentioning

confidence: 99%

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A New Technique for In Situ Determination of the Active Surface Area Changes of Li–Ion Battery Electrodes

Ratyński

Hamankiewicz

Buchberger

et al. 2020

Batteries & Supercaps

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Li‐ion batteries have been of a great interest for over three decades. A geometric electrode surface area is generally used for Li‐ion electrochemical parameters calculations. Since the real electrode is a complex system composed of the thick porous structure, the contact surface area between the active mass and electrolyte is far larger than geometrical. This approximation leads to a large deviation of obtained results, especially within different laboratories and for volume and surface changing materials, e. g., silicon. The article presents a new method of in situ analysis of active surface area variations applicable for Li‐ion electrodes. The method relies on the electrochemical impedance spectroscopy measurement (EIS) performed at an arbitrarily chosen state of charge during superimposed DC current flow. The correlation between a local ion concentration with a charge transfer resistance allows to evaluate the differences of the active surface area. The presented method is not affected by the SEI layer presence, the material composition, nor the lithiation mechanism. Due to limited EIS frequency range the presented method can be performed with a relatively short time. Our new in situ surface area determination can greatly improve the accuracy of the electrochemical parameters evaluation and enable the proper result analysis. We believe that our method can become a standard procedure implemented in every research focusing on the electrochemical parameter determination of the volume changing active materials.

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“…New active materials are under intensive development in terms of their capacity, power density or cycle life enhancement. One of the most promising, next generation negative electrode active materials are Group IV elements such as silicon, germanium, tin, and lead [ 4 , 5 , 6 , 7 ], as well as their corresponding oxides or nitrides [ 8 , 9 , 10 ]. In this group, the silicon presents the highest specific capacity (3590 mAh g −1 ), which is almost ten times greater than presently used graphite’s (372 mAh g −1 ) [ 11 ], and over three times higher than tin’s (993 mAh g −1 ) [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation of Nano-Silicon as a Method for Cycle Life Enhancement of Li-ion Active Materials

et al. 2020

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Among the many studied Li-ion active materials, silicon presents the highest specific capacity, however it suffers from a great volume change during lithiation. In this work, we present two methods for the chemical modification of silicon nanoparticles. Both methods change the materials’ electrochemical characteristics. The combined XPS and SEM results show that the properties of the generated silicon oxide layer depend on the modification procedure employed. Electrochemical characterization reveals that the formed oxide layers show different susceptibility to electro-reduction during the first lithiation. The single step oxidation procedure resulted in a thin and very stable oxide that acts as an artificial SEI layer during electrode operation. The removal of the native oxide prior to further reactions resulted in a very thick oxide layer formation. The created oxide layers (both thin and thick) greatly suppress the effect of silicon volume changes, which significantly reduces electrode degradation during cycling. Both modification techniques are relatively straightforward and scalable to an industrial level. The proposed modified materials reveal great applicability prospects in next generation Li-ion batteries due to their high specific capacity and remarkable cycling stability.

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The effect of compressive stresses on a silicon electrode’s cycle life in a Li-ion battery

Abstract: We have investigated the effect of applying external pressure during cell preparation and its further electrochemical behavior as a Li-ion battery electrode.

Cited by 26 publications

References 23 publications

Structure, Morphology, and Electrochemical Properties of Carbon-Coated Lithium-Manganese Orthosilicate with Sucrose as a Carbon Source

Structure, Morphology, and Electrochemical Properties of Carbon-Coated Lithium-Manganese Orthosilicate with Sucrose as a Carbon Source

A New Technique for In Situ Determination of the Active Surface Area Changes of Li–Ion Battery Electrodes

Surface Oxidation of Nano-Silicon as a Method for Cycle Life Enhancement of Li-ion Active Materials

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