Numerical and experimental evaluation of the relationship between porous electrode structure and effective conductivity of ions and electrons in lithium-ion batteries

Inoue, Gen; Kawase, Motoaki

doi:10.1016/j.jpowsour.2016.12.098

Cited by 108 publications

(67 citation statements)

References 40 publications

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“…For thick composite electrodes, the theoretical studies become even more challenging but critical for the optimization and practical application. A very significant effort on this point was reported by Inoue and Kawase . In this study, they developed a correlation equation between a porous structure and the effective conductivity.…”

Section: Discussionmentioning

confidence: 98%

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Wang

Min

et al. 2018

Advanced Materials

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portable electronics, cell phones, electrical vehicles (EVs), aerospace, etc. For advanced batteries, higher and higher energy density and/or power density, long cycling stability, good device safety, and low-cost are the primary goals. Since the energy density is mainly dependent on the specific capacity and loading level of active materials (AMs), AMs usually dominate the volume and weight inside the batteries. Because of this, tremendous efforts have been focused on high-performance AMs. However, the electrochemical performance of energy storage devices (ESDs) is fundamentally determined by a collective contribution or teamwork of all the components: AMs, electrolyte, separator, conductive agent, binders, etc. More importantly, with the increasing interests on high-capacity AMs (e.g., silicon, sulfur, Li-rich cathode, etc.), it becomes very clear that the "traffic system" (i.e., the charge transport system) plays very critical roles in the performance of the high-capacity AMs. Take silicon anode for example, a durable and flexible conductive network inside the electrode composite has been vital for addressing the big volume change issue. In this case, high-performance binders and conductive agent that can generate advanced conductive network are the keys. [2] In addition, with the increasing interests on EVs and flexible electronics, building a powerful and robust charge transport system inside ESDs is an urgent and critical task to support fast charging/ discharging capability and even flexibility of ESDs. In short, with the fast development of energy storage technologies, EVs, cell phones, etc., there is a critical, urgent, and challenging task on building powerful and durable charge transport system in next-generation advanced ESDs. Charge Transport Inside ESDsThe thriving of big cities highly relies on a powerful traffic system that transports the people, foods, products, etc. Similar to this picture, ESDs are powered by the transportation of charges, including both ions and electrons. As illustrated in Figure 1a, one can analogize the charge transport system and AMs in the electrodes of ESDs to the traffic system and buildings (i.e., host system of people), respectively. This analogy example not only help to explain the relationship between The charge transport system in an energy storage device (ESD) fundamentally controls the electrochemical performance and device safety. As the skeleton of the charge transport system, the "traffic" networks connecting the active materials are primary structural factors controlling the transport of ions/electrons. However, with the development of ESDs, it becomes very critical but challenging to build traffic networks with rational structures and mechanical robustness, which can support high energy density, fast charging and discharging capability, cycle stability, safety, and even device flexibility. This is especially true for ESDs with high-capacity active materials (e.g., sulfur and silicon), which show notable volume change during cycling. Therefore, there is an ur...

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Section: Discussionmentioning

confidence: 98%

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Wang

Min

et al. 2018

Advanced Materials

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“…However, thickened electrodes requires sufficient ion/electron conductivities along longer charge transfer distance and optimized design of electrode structures . In this regard, tortuosity (τ) and porosity (ε) of electrodes are two critical factors that closely relate to ion/electron conductivities of electrode . Constructing 3D porous electrodes that possess large electrode/electrolyte contact areas and continuous, low‐tortuosity vertical channels contributes to fast ion/electron transfer, especially in highly mass‐loaded electrodes .…”

Section: Introductionmentioning

confidence: 99%

Sandwich, Vertical‐Channeled Thick Electrodes with High Rate and Cycle Performance

Zhao

Sun

Chen

et al. 2019

Adv Funct Materials

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3D thick electrode design is a promising strategy to increase the energy density of lithium-ion batteries but faces challenges such as poor rate and limited cycle life. Herein, a coassembly method is employed to construct low-tortuosity, mechanically robust 3D thick electrodes. LiFe 0.7 Mn 0.3 PO 4 nanoplates (LFMP NPs) and graphene are aligned along the growth direction of ice crystals during freezing and assembled into sandwich frameworks with vertical channels, which prompts fast ion transfer within the entire electrode and reveals a 2.5-fold increase in ion transfer performance as opposed to that of random structured electrodes. In the sandwich framework, LFMP NPs are entrapped in the graphene wall in a "plate-on-sheet" contact mode, which avoids the detachment of NPs during cycling and also constitutes electron transfer highways for the thick electrode. Such vertical-channel sandwich electrodes with mass loading of 21.2 mg cm −2 exhibit a superior rate capability (0.2C-20C) and ultralong cycle life (1000 cycles). Even under an ultrahigh mass loading of 72 mg cm −2 , the electrode still delivers an areal capacity up to 9.4 mAh cm −2 , ≈2.4 times higher than that of conventional electrodes. This study provides a novel strategy for designing thick electrodes toward high performance batteries.

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“…Particularly, the dissolution of transition metals also brings about the structural degradation of the Ni-rich cathode materials. [7][8][9] As we know, Ni plays an important role in Ni-rich layered cathode material, which not only provides most capacity of cathode (by the redox reaction of Ni) but also serves as an important component of layered structure. So the dissolution of Ni not only causes the capacity degradation, but also leads to the instability of the layered structure.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive

Zhang

Xue

et al. 2019

ChemElectroChem

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The dissolution of transition metals is the main reason for the capacity fading and structural degradation of Ni‐rich cathode materials. In this work, NiF2 is used as functional electrolyte additive for the first time to improve the performance of LiNi0.6Co0.2Mn0.2O2 cathodes by the chemical‐equilibrium principle. The suppression of transition‐metal dissolution, especially Ni, is proved by energy disperse spectroscopy and inductively coupled plasma analyses. The NiF2 additive can stabilize the cathode structure by relieving the dissolution of transition metals, which is confirmed by morphology and structure analyses. Moreover, the NiF2 additive also reduces side reactions of the cell, which is verified by self‐discharge tests and coulombic efficiency analysis. As a result, the addition of 100 ppm NiF2 elevates the capacity retention of the Li/NCM622 half‐cell from 69.53 to 79.67 % after 100 cycles, and the 100 ppm NiF2‐containing cathode delivers an initial capacity of 174.0 mAh g−1 even at 8 C after 50 cycles.

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Numerical and experimental evaluation of the relationship between porous electrode structure and effective conductivity of ions and electrons in lithium-ion batteries

Cited by 108 publications

References 40 publications

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Sandwich, Vertical‐Channeled Thick Electrodes with High Rate and Cycle Performance

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive

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Numerical and experimental evaluation of the relationship between porous electrode structure and effective conductivity of ions and electrons in lithium-ion batteries

Cited by 108 publications

References 40 publications

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Sandwich, Vertical‐Channeled Thick Electrodes with High Rate and Cycle Performance

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF2 as Electrolyte Additive

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Product

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Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive