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All-solid-state hybrid electrode configuration for high-performance all-solid-state batteries: Comparative study with composite electrode and diffusion-dependent electrode

Title
All-solid-state hybrid electrode configuration for high-performance all-solid-state batteries: Comparative study with composite electrode and diffusion-dependent electrode
Author(s)
Kim, Ju YoungJung, SeungwonKang, Seok HunLee, Myeong JuJin, DaheeShin, Dong OkLee, Young-GiLee, Yong Min
Issued Date
2022-01
Citation
Journal of Power Sources, v.518
Type
Article
Author Keywords
All-solid-state batteryElectrode designHybrid structureLithium-ion transport
Keywords
INTERPHASE FORMATIONSTABILITYLIMITATIONSCAPACITYTHIN
ISSN
0378-7753
Abstract
To realize high-performance all-solid-state batteries, an efficient design for all-solid-state electrodes is vital. Composite electrode, which is comprised of well-mixed active material and solid electrolyte, is a typical structure to build well-percolated ionic pathways within the electrode. In contrast, diffusion-dependent electrode, which consists mostly of active material, is an emerging approach that utilizes interparticle diffusion between active material particles for charge/discharge. This design enables maximization of energy density and simplification of the fabrication process. Herein, we present a hybrid all-solid-state electrode that combines the merits of each electrode as a new electrode concept. This electrode consists of a bilayer structure of the composite electrode and the diffusion-dependent electrode, and its electrochemical features such as initial Coulombic efficiency, capacity retention, and energy density are systematically analyzed. Owing to the active utilization of lithium-ion transports via percolated solid electrolyte particles and interparticle diffusion of active material particles, the graphite-based hybrid electrode with a practically meaningful capacity (∼4 mA h cm−2) is demonstrated to deliver moderately high energy densities at various C-rates. In particular, silicon/graphite-based hybrid electrode can exhibit high normalized capacities of 5.83 mA h cm−2 and 1300 mA h cm−3, which are among the highest values reported to date for all-solid-state batteries. © 2021 The Authors
URI
http://hdl.handle.net/20.500.11750/15842
DOI
10.1016/j.jpowsour.2021.230736
Publisher
Elsevier BV
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Department of Energy Science and Engineering Battery Materials & Systems LAB 1. Journal Articles

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