High-Performance Thick Cathode Based on Polyhydroxyalkanoate Binder for Li Metal Batteries

Abstract

Thick cathodes can overcome the low capacity issues, which mostly hamper the performance of the conventional active cathode materials, used in rechargeable Li batteries. However, the typical slurry-based method induces cracking and flaking during the fabrication of thick electrodes. In addition, a significant increase in the charge-transfer resistance and local current overload results in poor rate capabilities and cycling stabilities, thereby limiting electrode thickening. In this study, a synergistic dual-network combination strategy based on a conductive nanofibrillar network (CNN) and a nano-bridging amorphous polyhydroxyalkanoate (aPHA) binder is used to demonstrate the feasibility of constructing a high-performance thick cathode. The CNN and aPHA dual network facilitates the fabrication of a thick cathode (≥ 250 μm thickness and ≥ 90 wt% active cathode material) by a mass-producible slurry method. The thick cathode exhibited a high rate capability and excellent cycling stability. In addition, the thick cathode and thin Li metal anode pair (Li//t-NCM) exhibited an optimal energy performance, affording high-performance Li metal batteries with a high areal energy of ~ 25.3 mW h cm⁻², a high volumetric power density of ~ 1720 W L⁻¹, and an outstanding specific energy of ~ 470 W h kg⁻¹ at only 6 mA h cm⁻².

TOC figure: Synergistic combination of a conductive nano-fibrillar network (CNN) and nano-bridging amorphous polyhydroxyalkanoate (aPHA) binder that affords the high-performance cathode with ≥ 250 μm thickness and ≥ 90 wt% active cathode material. Li-metal batteries (Li//t-NCM) based on thick cathodes and thin Li exhibit outstanding energy storage performance.

Keywords

Thick cathode / Polyhydroxyalkanoate binder / Nano-bridging / Conductive nano-fibrillar network / Lithium metal battery

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Funding

National Institute for International Education(2021R1A4A2001403); Korea Institute of Science and Technology(2V09840); CJ cheiljedang