Electrode Surface Composition of Dual-Intercalation, All-Graphite Batteries

Dyatkin, B. L.; Halim, Joseph; Read, Jeffrey

doi:10.3390/c3010005

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…The LTO‐modified MCMB cathode achieves an inspiring capacity retention of 85.1% after 2000 cycles (Figure c, Figure S5c,d, Supporting Information), much superior to the pristine MCMB cathode with only 53.7% after 750 cycles. In comparison with the previously reported MCMB cathodes, this LTO‐modified MCMB cathode exhibits notable improvements in terms of both specific capacity and cyclability (Table S1, Supporting Information). Electrochemical impedance spectroscopy (EIS) results shown in Figure d present that the impedance for LTO‐modified MCMB cathode is much lower than that of the pristine MCMB cathode after cycling.…”

Section: Resultssupporting

confidence: 79%

An In Situ Interface Reinforcement Strategy Achieving Long Cycle Performance of Dual‐Ion Batteries

Han

Zhang

et al. 2019

Advanced Energy Materials

102

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Dual‐ion batteries (DIBs) with high operation voltage offer promising candidates for low‐cost clean energy chemistries. However, there still exist tough issues, including structural collapse of the graphite cathode due to solvent co‐intercalation and electrolyte decomposition on the electrode/electrolyte interface, which results in unsatisfactory cyclability and fast battery failure. Herein, Li4Ti5O12 (LTO) modified mesocarbon microbeads (MCMBs) are proposed as a cathode material. The LTO layer functions as a skeleton and offers electrocatalytic active sites for in situ generation of a favorable and compatible cathode electrolyte interface (CEI) layer. The synergetic LTO‐CEI network can change the thermodynamic behavior of the PF6− intercalation process and maintain the structural integrity of the graphite cathode, as a “Great Wall” to protect the cathode from structural collapse and electrolyte decomposition. Such LTO‐CEI reinforced cathode exhibits a prolonged cyclability with 85.1% capacity retention after 2000 cycles even at cut‐off potential of 5.4 V versus Li+/Li. Moreover, the LTO‐modified MCMB (+)//prelithiated MCMB (−) full cell exhibits a high energy density of ≈200 Wh kg−1, remarkably enhanced cyclability with 93.5% capacity retention after 1000 cycles. Undoubtedly, this work offers in‐depth insight into interface chemistry, which can arouse new originality to boost the development of DIBs.

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Section: Resultssupporting

confidence: 79%

An In Situ Interface Reinforcement Strategy Achieving Long Cycle Performance of Dual‐Ion Batteries

Han

Zhang

et al. 2019

Advanced Energy Materials

102

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“…28 Moreover, the insertion of such surface moieties entails an enlarged interlayer spacing while maintaining the long-range-ordered layered structure, which can facilitate ion diffusion and intercalation. 8,29 Lithium-Ion Storage Behavior. Commonly, it would be ideal if the regenerated LIBs materials could deliver comparable electrochemical performance in LIBs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sustainable Regeneration of Spent Graphite as a Cathode Material for a High-Performance Dual-Ion Battery

Zheng

Wang

Qian

et al. 2023

ACS Sustainable Chem. Eng.

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A resource-efficient and energy-saving recycling process is vital for establishing a sustainable circular economy of lithium-ion batteries (LIBs). Herein, we propose and use a one-step water-based recycling process to recycle and regenerate the graphite anode materials from spent LIBs. This process can not only successfully regenerate graphite from a solid electrolyte interface, dead lithium, and residual electrolyte and maintain its long-range-ordered layer graphite structure but also enlarge the interlayer distance and introduce abundant oxygen-containing functional groups to the as-regenerated graphite. Our electrochemical characterization and density functional theory (DFT) calculations reveal that expanded interlayer spacing and the oxygen-containing moieties make the regenerated graphite more suitable for storing PF6 – rather than Li+. As such, the as-regenerated graphite facilitates resultant graphite dual-ion batteries (GDIBs) with impressive rate performance and stability, for example, an 85.3% capacity retention even after 500 cycles at 1 A g–1. Such a simple waste-to-resource strategy proposed in this work is expected to provide a low-cost and inspiring recycling pathway for spent LIBs and enable the sustainable manufacturing of GDIBs.

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“…Therefore, not only geometrical but also material information of these phases are taken into account in the generation process. In the case of graphite-based electrodes, we consider graphite APs, carbon black, and PVDF binder [10]. However, the procedure described below can be applied to any other type of graphite-based electrode without loss of generality.…”

Section: Electrode Microstructurementioning

confidence: 99%

Lattice-Particle Microstructural Model for Ion Diffusion in Graphite Electrode Batteries

Marin-Montin¹,

Fresneda-Portillo²,

Montero‐Chacón³

2021

14th WCCM-ECCOMAS Congress

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In this work, we propose a lattice-particle approach to study ionic diffusion across graphite electrodes. In our approach, we generate virtual representative volume elements (RVE) of the electrode material based on its composition, i.e., active particles, carbon additives, and binder. Porosity is also accounted for as an input parameter. To account for the evolution of the ionic concentration, Fickean diffusion is considered. This problem is solved within a network of one-dimensional elements, which is constructed upon the particles of the RVE, yielding a three-dimensional lattice. We use the centraldifference time-integration scheme to solve the transient problem within the framework of the finite element method for the spatial discretization. One of the main advantages of our approach is that we are able to reduce the number of degrees of freedom and thus the computational cost in comparison to the conventional continuum-based finite element simulations. For the transport simulations, we consider Li ions, although our approach can be also applied to other type of species, such as PF − 6 anions in the case of DIGB with LiPF 6 electrolyte, for instance. Finally, we analyze the effect of microstructural features of graphite electrodes on transport properties such as the effective diffusivity.

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Electrode Surface Composition of Dual-Intercalation, All-Graphite Batteries

Cited by 12 publications

References 25 publications

An In Situ Interface Reinforcement Strategy Achieving Long Cycle Performance of Dual‐Ion Batteries

An In Situ Interface Reinforcement Strategy Achieving Long Cycle Performance of Dual‐Ion Batteries

Sustainable Regeneration of Spent Graphite as a Cathode Material for a High-Performance Dual-Ion Battery

Lattice-Particle Microstructural Model for Ion Diffusion in Graphite Electrode Batteries

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