Constructing a 700 Wh kg−1-level rechargeable lithium-sulfur pouch cell

Cheng, Qian; Chen, Zixian; Li, Xiyao; Hou, Li‐Peng; Bi, Chen‐Xi; Zhang, Xueqiang; Huang, Jia‐Qi; Li, Bo‐Quan

doi:10.1016/j.jechem.2022.09.029

Cited by 74 publications

(24 citation statements)

References 53 publications

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“…Further studies in different cell configuration such as the pouch cell one can further proof the actual applicability of this system, however additional challenges ascribed to the cell assembly and geometry should be certainly taken into account. [94]…”

Section: Chemsuschemmentioning

confidence: 99%

Diffusional Features of a Lithium‐Sulfur Battery Exploiting Highly Microporous Activated Carbon

et al. 2023

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Diffusion processes at the electrode/electrolyte interphase drives the performance of lithium‐sulfur batteries, and activated carbon (AC) can remarkably vehicle ions and polysulfide species throughout the two‐side liquid/solid region of the interphase. We reveal original findings such as the values of the diffusion coefficient at various states of charge of a Li−S battery using a highly porous AC, its notable dependence on the adopted techniques, and the correlation of the diffusion trend with the reaction mechanism. X‐ray photoelectron spectroscopy (XPS) and X‐ray energy dispersive spectroscopy (EDS) are used to identify in the carbon derived from bioresidues heteroatoms such as N, S, O and P, which can increase the polarity of the C framework. The transport properties are measured by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT). The study reveals Li+‐diffusion coefficient (DLi+) depending on the technique, and values correlated with the cell state of charge. EIS, CV, and GITT yield a DLi+ within 10−7–10−8 cm2 s−1, 10−8–10−9 cm2 s−1, and 10−6–10−12 cm2 s−1, respectively, dropping down at the fully discharged state and increasing upon charge. GITT allows the evaluation of DLi+ during the process and evidences the formation of low‐conducting media upon discharge. The sulfur composite delivers in a Li‐cell a specific capacity ranging from 1300 mAh g−1 at 0.1 C to 700 mAh g−1 at 2C with a S loading of 2 mg cm−2, and from 1000 to 800 mAh g−1 at 0.2C when the S loading is raised to 6 mg cm−2.

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Section: Chemsuschemmentioning

confidence: 99%

Diffusional Features of a Lithium‐Sulfur Battery Exploiting Highly Microporous Activated Carbon

et al. 2023

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“…Moreover, the dual voltage plateaus in discharge (reduction) cycles virtually overlapped and persisted for all 50 cycles thus tested, suggestive of improved charge retention. The observed dual plateaus are typical features of conventional lithium–sulfur battery, which are often attributed to the progressive conversion of higher order solid elemental sulfur to lower order soluble polysulfide derivatives during cycling . In addition, the difference between the voltages at which oxidation and reduction are triggered gradually widens as cycles are repeated.…”

Section: Resultsmentioning

confidence: 94%

“…The observed dual plateaus are typical features of conventional lithium− sulfur battery, which are often attributed to the progressive conversion of higher order solid elemental sulfur to lower order soluble polysulfide derivatives during cycling. 36 In addition, the difference between the voltages at which oxidation and reduction are triggered gradually widens as cycles are repeated. While the conventional sulfur battery showed a difference of more than 0.2 V, the battery with the VB monomer applied to the sulfur exhibited a difference of only about 0.1 V, indicating that the improved charge and discharge performance, which may be attributed to the excellent compatibility of VB and sulfur.…”

Section: Resultsmentioning

confidence: 99%

Development of Multifunctional Cathode Binder via Inverse Vulcanization for Lithium–Sulfur Battery with Enhanced Capacity Retention

Jeong

Kyu

2023

J. Phys. Chem. C

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Vinyl-benzaldehyde (VB) monomers containing four functional groups were newly synthesized using the Williamson ether synthesis method. The two aldehyde groups of the synthesized monomers were able to react with amine-terminated macromonomers to form flexible networks. In addition, the two vinyl groups were found to be capable of inverse vulcanization with sulfur by conducting qualitative chemical analysis. The lithium–sulfur battery prepared using the VB-based cathode binder achieved high specific capacity with excellent capacity retention compared to conventional sulfur batteries, demonstrating the potential of the new binder.

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“…Furthermore, a sulfur cathode with the expected hierarchical porous structure was developed by Xie et al that enabled 481 Wh kg –1 Li–S pouch cells with an ultralow E/S ratio of 1.2 μL mg –1 . A 700 Wh kg –1 level Li–S pouch cell with a primary discharge capacity of 1560 mAh g –1 was achieved under an ultralow E/S ratio condition of 1.7 g ele g S –1 …”

Section: Introductionmentioning

confidence: 99%

Cathode Kinetics Evaluation in Lean-Electrolyte Lithium–Sulfur Batteries

Chen

Cheng

et al. 2023

J. Am. Chem. Soc.

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Lithium–sulfur (Li–S) batteries afford great promise on achieving practical high energy density beyond lithium-ion batteries. Lean-electrolyte conditions constitute the prerequisite for achieving high-energy-density Li–S batteries but inevitably deteriorates battery performances, especially the sulfur cathode kinetics. Herein, the polarizations of the sulfur cathode are systematically decoupled to identify the key kinetic limiting factor in lean-electrolyte Li–S batteries. Concretely, an electrochemical impedance spectroscopy combined galvanostatic intermittent titration technique method is developed to decouple the cathodic polarizations into activation, concentration, and ohmic parts. Therein, activation polarization during lithium sulfide nucleation emerges as the dominant polarization as the electrolyte-to-sulfur ratio (E/S ratio) decreases, and the sluggish interfacial charge transfer kinetics is identified as the main reason for degraded cell performances under lean-electrolyte conditions. Accordingly, a lithium bis(fluorosulfonyl)imide electrolyte is proposed to decrease activation polarization, and Li–S batteries adopting this electrolyte provide a discharge capacity of 985 mAh g–1 under a low E/S ratio of 4 μL mg–1 at 0.2 C. This work identifies the key kinetic limiting factor of lean-electrolyte Li–S batteries and provides guidance on designing rational promotion strategies to achieve advanced Li–S batteries.

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Constructing a 700 Wh kg−1-level rechargeable lithium-sulfur pouch cell

Cited by 74 publications

References 53 publications

Diffusional Features of a Lithium‐Sulfur Battery Exploiting Highly Microporous Activated Carbon

Diffusional Features of a Lithium‐Sulfur Battery Exploiting Highly Microporous Activated Carbon

Development of Multifunctional Cathode Binder via Inverse Vulcanization for Lithium–Sulfur Battery with Enhanced Capacity Retention

Cathode Kinetics Evaluation in Lean-Electrolyte Lithium–Sulfur Batteries

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