Cellulose Elementary Fibrils as Deagglomerated Binder for High-Mass-Loading Lithium Battery Electrodes  

作　　者：Young-Kuk Hong Jung-Hui Kim Nag-Young Kim Kyeong-Seok Oh Hong-I Kim Seokhyeon Ryu Yumi Ko Ji-Young Kim Kwon-Hyung Lee Sang-Young Lee 

机构地区：[1]Department of Chemical and Biomolecular Engineering,Yonsei University,50 Yonsei-Ro,Seodaemun-Gu,Seoul 03722,Republic of Korea [2]Advanced Analysis and Data Center,Korea Institute of Science and Technology(KIST),Seoul 02792,Republic of Korea [3]Ulsan Advanced Energy Technology R&D Center,Korea Institute of Energy Research(KIER),Ulsan 44776,Republic of Korea [4]Department of Battery Engineering,Yonsei University,50 Yonsei-Ro,Seodaemun-Gu,Seoul 03722,Republic of Korea

出　　处：《Nano-Micro Letters》2025年第5期281-296,共16页纳微快报(英文版)

基　　金：supported by the Institute of Civil Military Technology Cooperation funded by the Defense Acquisition Program Administration and Ministry of Trade,Industry and Energy of Korean government under grant No 23-CM-AI-08.

摘　　要：Amidst the ever-growing interest in high-mass-loading Li battery electrodes,a persistent challenge has been the insufficient continuity of their ion/electron conduction pathways.Here,we propose cellulose elementary fibrils(CEFs)as a class of deagglomerated binder for high-mass-loading electrodes.Derived from natural wood,CEF represents the most fundamental unit of cellulose with nanoscale diameter.The preparation of the CEFs involves the modulation of intermolecular hydrogen bonding by the treatment with a proton acceptor and a hydrotropic agent.This elementary deagglomeration of the cellulose fibers increases surface area and anionic charge density,thus promoting uniform dispersion with carbon conductive additives and suppressing interfacial side reactions at electrodes.Consequently,a homogeneous redox reaction is achieved throughout the electrodes.The resulting CEF-based cathode(overlithiated layered oxide(OLO)is chosen as a benchmark electrode active material)exhibits a high areal-mass-loading(50 mg cm^(-2),equivalent to an areal capacity of 12.5 mAh cm^(-2))and a high specific energy density(445.4 Wh kg–1)of a cell,which far exceeds those of previously reported OLO cathodes.This study highlights the viability of the deagglomerated binder in enabling sustainable high-mass-loading electrodes that are difficult to achieve with conventional synthetic polymer binders.

关 键 词：Cellulose elementary fibrils Deagglomeration Electrode binders Lithium batteries High-mass-loading 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ437[化学工程]