Thermal cycling induced capacity enhancement of graphite anodes in lithium-ion cells

Bhattacharya, Sandeep; Riahi, A.R.; Alpas, A.T.

doi:10.1016/j.carbon.2013.10.032

Cited by 29 publications

(28 citation statements)

References 40 publications

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“…In addition, it has been proved that modification of SEI film can be achievedn ot only by optimizationo ft he electrolyte system, but also by modification of the graphite electrode itself.F or example,t hermalp retreatment of an electrode at 60 8Cc an reduce graphite degradation and enhance the capacity of ag raphite electrodeb y2 8%,a t2 58C. [18] The pretreatment of ag raphite electrode using an aqueouss olution of Li 2 CO 3 provided ac onvenient and effective way to reduce electrode damage and improve long-term cycling capacity. [19] Based on these results, we postulatet hat if sulfur compounds such as Li 2 SO 4 could be introduced onto ag raphite electrodeb efore cycling,t he properties of the electrode/electrolyte interfacew ould be greatly improved andt he cyclic efficiency of the graphite electrodew ould increase.T his work proposes that pretreatment of ag raphite anode with Li 2 SO 4 methodi so fs pecial interest for LIBs,a nd may open up new possibilities for the exploration of beneficial graphite modifications.…”

Section: Introductionmentioning

confidence: 99%

Pretreatment of Graphite Anodes with Lithium Sulfate to Improve the Cycle Performance of Lithium‐Ion Batteries

Cui

Tang

et al. 2016

Energy Tech

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Graphite electrode surfaces are pretreated by spray‐deposition method with 0.5 mol L−1 Li2SO4 aqueous solution. The physical and electrochemical properties of a solid electrolyte interphase (SEI) film formed on the surface of Li2SO4‐treated graphite electrode are investigated by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and electrochemical measurements. The results show that the SEI film formed, promoted by Li2SO4, is thin, stable, effective, and elastic to accommodate volume changes of graphite electrode during electrochemical cycles. Due to the fact that the Li/mesophase carbon microbeads (MCMB) cell based on Li2SO4‐treated graphite electrode exhibits excellent cycling performance and low interfacial impedance, we can deduce that such modifies have positive implications for lithium‐ion batteries (LIBs), offering the possibility of faster‐charging LIBs and LIBs that are suitable for rate‐demanding applications, such electric vehicles and hybrid electric vehicles.

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Section: Introductionmentioning

confidence: 99%

Pretreatment of Graphite Anodes with Lithium Sulfate to Improve the Cycle Performance of Lithium‐Ion Batteries

Cui

Tang

et al. 2016

Energy Tech

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“…Therefore, it can be suggested that a more uniform SEI formed at 50 °C was more stable. It is possible that a stable and uniform SEI assisted in efficient Li-ion diffusion that, in turn, provided the higher capacity to graphene [42]. Previously it was observed that the SEI films formed on graphite-based anodes, after cycling in EC-based electrolytes, consisted of crystalline domains enclosed in an amorphous matrix [6].…”

Section: Sem Observations Of Surfaces Of Cycled Graphene Nanoflakesmentioning

confidence: 99%

“…The improved capacity would also depend on the composition of the SEI films formed on the anode surfaces [25,26,52]. For example, thermal pre-treatment of Li-ion cells containing graphite anodes at 60 °C [42] caused the formation of a Li 2 CO 3 -enriched SEI that enhanced the capacity by 28% compared to that at 25 °C. An SEI enriched with Li 2 CO 3 is known to provide facile diffusion paths for Li-ions across the SEI [53].…”

Section: Measurement Of Intercalation-induced Strain and Disorder In mentioning

confidence: 99%

A novel elevated temperature pre-treatment for electrochemical capacity enhancement of graphene nanoflake-based anodes

Bhattacharya

Alpas

2018

Mater Renew Sustain Energy

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Improvements in the specific capacity of graphene nanoflake-based anodes cycled vs. Li/Li + were investigated at two cycling temperatures of 25 and 50 °C. When cycled at 25 °C, the first cycle specific capacity of the graphene nanoflakes was 636 mA h g −1 , whereas cycling at 50 °C led to a 35% increase in the specific capacity to 856 mA h g −1 . High resolution SEM investigations revealed that the increased capacity of graphene cycled at 50 °C was accompanied by the formation of a uniform and continuous solid electrolyte interface (SEI). The strain generated in graphene anodes was reduced from 0.75% at 25 °C, to 0.12% at 50 °C, as determined by in situ Raman spectroscopy. This was attributed to the reduction in the extent of solvent co-intercalation at 50 °C. The results suggest that pre-cycling of Li-ion cell anodes containing graphene flakes at elevated temperatures would increase their specific capacity at the same charging/discharging current densities as that used for cycling at room temperature.

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“…[12] Electrode surface modification is a common focus of the attempts made in order to improve the electrochemical performance. [13][14][15][16][17][18][19] For example, heating Li-ion cells containing graphite electrodes at 333 K (60°C) in an EC-based electrolyte was found to generate a Li 2 CO 3 -enriched SEI on graphite surface, which in turn ensued a 28 pct increase in the battery capacity when subsequently tested at 298 K (25°C). [13] In another study, Li 2 CO 3 particles were pre-deposited on the surfaces of electrodes prior to cycling.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16][17][18][19] For example, heating Li-ion cells containing graphite electrodes at 333 K (60°C) in an EC-based electrolyte was found to generate a Li 2 CO 3 -enriched SEI on graphite surface, which in turn ensued a 28 pct increase in the battery capacity when subsequently tested at 298 K (25°C). [13] In another study, Li 2 CO 3 particles were pre-deposited on the surfaces of electrodes prior to cycling. [14] The SEI that was formed on the Li 2 CO 3 pre-treated electrodes improved the capacity retention of Li-ion batteries during long-term cycling, and this effect was attributed to enhanced Li-ion diffusion.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Nanocrystalline Sn-Coated Carbon Fibre Electrodes Cycled in Li-Ion Cells

Bhattacharya

Shafiei

Alpas

2015

Metallurgical and Materials Transactions E

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The mechanisms of electrochemical capacity retention and eventual degradation in composite anodes prepared by electrodepositing nanocrystalline Sn coating on carbon fibres (CF), Sn-CF, were studied using in situ optical microscopy, high-resolution scanning and transmission electron microscopy. Specific capacity changes of Sn-CF anodes (vs Li/Li + ) were observed to take place in three stages: during the first two galvanostatic cycles, a rapid capacity decrease (from 1045 to 930 mAh g À1 ) occurred, which was followed by a steady-state stage where the capacity remained constant at 922 ± 22 mAh g À1 . The fast capacity drop of Sn-CF in the first cycle was attributed to the partial decohesion of Sn from CFs although the carbon substrate remained unaffected due to formation of a layer from the solid electrolyte reduction products. The pure Sn electrode with a higher initial specific capacity than the Sn-CF displayed a rapid decrease in the same range, whereas the specific capacity of the uncoated CF was already much lower as the fibres were severely damaged in the first cycle.

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Thermal cycling induced capacity enhancement of graphite anodes in lithium-ion cells

Cited by 29 publications

References 40 publications

Pretreatment of Graphite Anodes with Lithium Sulfate to Improve the Cycle Performance of Lithium‐Ion Batteries

Pretreatment of Graphite Anodes with Lithium Sulfate to Improve the Cycle Performance of Lithium‐Ion Batteries

A novel elevated temperature pre-treatment for electrochemical capacity enhancement of graphene nanoflake-based anodes

Microstructural Characterization of Nanocrystalline Sn-Coated Carbon Fibre Electrodes Cycled in Li-Ion Cells

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