Sulfur: an intermediate template for advanced silicon anode architectures

Baasner, Anne; Dörfler, Susanne; Piwko, Markus; Desilani, Sébastien; Brückner, Jan; Althues, Holger; Kaskel, Stefan

doi:10.1039/c8ta03647k

Cited by 22 publications

(26 citation statements)

References 69 publications

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“…[48] The carbon matrix surrounding the SiNPs is also visible in the transmission electron microscopy (TEM) images (Figure 2c-d). In contrast to other core shell templates [44] , voids are not clearly visible possibly due to a lower contrast in the TEM images. This indicates an intimate contact between carbon and silicon.…”

Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 60%

“…[18] The free volume between the silicon core and the carbon matrix does not only allow a free volume expansion of silicon but the carbon shell also increases the electric conductivity of the anode and the stability of the SEI which forms at the outer carbon shell surface. [8,12,18,44] To the best of our knowledge, we report here for the first time, nanostructured silicon carbon composite void structures as anodes in all-solid-state Li-ion batteries and their successful implementation into full cells. Similar to liquid electrolytes, the carbon shell can effectively compensate the volume changes of silicon which improves the electrochemical performance compared to bare SiNPs (Figure 1).…”

Section: Introductionmentioning

confidence: 90%

“…The aggregation lowers the surface energy of the nanoparticles and leads to a carbon coating of SiNP agglomerates rather than individual SiNPs as can been seen in the SEM images of the Si-C composites (Figure 3b-d). [44] Although a homogeneous carbon coating surrounding the crystalline SiNPs is observable for all Si-C composites ( Figure 3b-d), the structure differs for the respective PVB:Si mass ratio employed in the synthesis and the resulting Si content. The Si-C particles of Si34@C (Figure 3c, 60 ± 8 nm) have almost the same diameter as the bare SiNPs (52 ± 5 nm) and are smaller compared to Si37@C ( Figure 3d, 64 ± 7 nm) or Si28@C ( Figure 3b, 94 ± 16 nm) particles, which is due to the smaller amount of the void template in the synthesis of Si34@C. However, the values should not be overestimated as only a certain area of the sample is analyzed.…”

Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 98%

“…Several Si-C composites were synthesized using silicon nanoparticles (SiNPs), polyvinylbutyral (PVB) as void template and sucrose as carbon precursor applying a similar route as previously described. [18,44] After melt coating PVB on the SiNPs, the sucrose is polymerized via a wet-chemical process around the particles. During pyrolysis, PVB is removed through thermal decomposition whereby voids are formed in-situ.…”

Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 99%

“…nanostructured Si/C fibers in ASSBs deliver a reversible capacity of about 700 mAh g -1 over 70 cycles with CEs up to 99.2 % in half-cells. [43] The nanostructured Si-C composites used in this study offering a void between the silicon nanoparticle (SiNP) and the outer carbon shell [12,44] have already been analyzed in conventional LIBs. [18] The free volume between the silicon core and the carbon matrix does not only allow a free volume expansion of silicon but the carbon shell also increases the electric conductivity of the anode and the stability of the SEI which forms at the outer carbon shell surface.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Si-C Composites As High-Capacity Anode Material For All-Solid-State Lithium-Ion Batteries

Poetke

Hippauf²,

Baasner³

et al. 2021

Preprint

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Silicon carbon void structures (Si-C) are attractive anode materials for Lithium-ion batteries to cope with the volume changes of silicon during cycling. In this study, Si-C with varying Si contents (28 ‑ 37 %) are evaluated in all-solid-state batteries (ASSBs) for the first time. The carbon matrix enables enhanced performance and lifetime of the Si-C composites compared to bare silicon nanoparticles in half-cells even at high loadings of up to 7.4 mAh cm-2. In full cells with nickel-rich NCM (LiNi0.9Co0.05Mn0.05O2, 210 mAh g-1), kinetic limitations in the anode lead to a lowered voltage plateau compared to NCM half-cells. The solid electrolyte (Li6PS5Cl, 3 mS cm-1) does not penetrate the Si-C void structure resulting in less side reactions and higher initial coulombic efficiency compared to a liquid electrolyte (72.7 % vs. 31.0 %). Investigating the influence of balancing of full cells using 3-electrode ASSB cells revealed a higher delithiation of the cathode as a result of the higher cut-off voltage of the anode at high n/p ratios. During galvanostatic cycling, full cells with either a low or rather high overbalancing of the anode showed the highest capacity retention of up to 87.7 % after 50 cycles.

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Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 90%

Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 98%

Section: Structural Characterization Of Si-c Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanostructured Si-C Composites As High-Capacity Anode Material For All-Solid-State Lithium-Ion Batteries

Poetke

Hippauf²,

Baasner³

et al. 2021

Preprint

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Nanostructured Si−C Composites As High‐Capacity Anode Material For All‐Solid‐State Lithium‐Ion Batteries**

Poetke

Hippauf

Baasner

et al. 2021

Batteries & Supercaps

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Silicon carbon void structures (Si−C) are attractive anode materials for lithium‐ion batteries to cope with the volume changes of silicon during cycling. In this study, Si−C with varying Si contents (28–37 %) are evaluated in all‐solid‐state batteries (ASSBs) for the first time. The carbon matrix enables enhanced performance and lifetime of the Si−C composites compared to bare silicon nanoparticles in half‐cells even at high loadings of up to 7.4 mAh cm−2. In full cells with nickel‐rich NCM (LiNi0.9Co0.05Mn0.05O2, 210 mAh g−1), kinetic limitations in the anode lead to a lowered voltage plateau compared to NCM half‐cells. The solid electrolyte (Li6PS5Cl, 3 mS cm−1) does not penetrate the Si−C void structure resulting in less side reactions and higher initial coulombic efficiency compared to a liquid electrolyte (72.7 % vs. 31.0 %). Investigating the influence of balancing of full cells using 3‐electrode ASSB cells revealed a higher delithiation of the cathode as a result of the higher cut‐off voltage of the anode at high n/p ratios. During galvanostatic cycling, full cells with either a low or rather high overbalancing of the anode showed the highest capacity retention of up to 87.7 % after 50 cycles.

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An Ether‐Based Low Density Electrolyte for the Use of Graphite Anodes in Stable Lithium‐Sulfur Batteries

Hoffmann

Schmidt

Müller

et al. 2023

Batteries & Supercaps

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Lithium sulfur (Li−S) batteries represent an interesting technology due to the high theoretical capacity of sulfur and the low cost of the cathode material. Li−S cells with graphite electrodes could be an option for low‐cost stationary energy storage as graphite is cheap and the electrode production process is well established. Unfortunately, in most Li−S electrolytes, graphite is not stable due to solvent co‐intercalation and degrades fast. In this work, a new low density electrolyte based on hexyl methyl ether (HME) and 1,3‐dioxalane (DOL) is presented, which allows to use graphite as anode material for Li−S batteries. In symmetric graphite vs. graphite cells an averaged Coulombic efficiency of 99.94 % per electrode could be reached. For the first time, cycling conditions like voltage window and balancing were optimized for Li−S cells with graphite anodes and the suitability of the concept could be demonstrated in multilayer pouch cells under realistic conditions.

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Sulfur: an intermediate template for advanced silicon anode architectures

Abstract: Due to a void structure the stability of the Si–C anode increased and it was coupled with a sulfur cathode.

Cited by 22 publications

References 69 publications

Nanostructured Si-C Composites As High-Capacity Anode Material For All-Solid-State Lithium-Ion Batteries

Nanostructured Si-C Composites As High-Capacity Anode Material For All-Solid-State Lithium-Ion Batteries

Nanostructured Si−C Composites As High‐Capacity Anode Material For All‐Solid‐State Lithium‐Ion Batteries**

An Ether‐Based Low Density Electrolyte for the Use of Graphite Anodes in Stable Lithium‐Sulfur Batteries

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