Enhancing micro-scale SiO_(x)anode durability:Electro-mechanical strengthening of binder networks via anchoring carbon nanotubes with carboxymethyl cellulose  

作　　者：Chaeyeon Ha Jin Kyo Koo Jun Myoung Sheem Young-Jun Kim 

机构地区：[1]SKKU Advanced Institute of Nano Technology(SAINT),Sungkyunkwan University,Suwon 16419,Republic of Korea [2]Department of Nano Science and Technology,Sungkyunkwan University,Suwon 16419,Republic of Korea [3]Advanced Center for Convergence Energy Storage System,Sungkyunkwan University,Suwon 16419,Republic of Korea [4]SKKU Instute of Energy Science and Technology(SIEST),Sungkyunkwan University,Suwon 16419,Republic of Kore

出　　处：《Journal of Energy Chemistry》2025年第2期23-33,I0002,共12页能源化学(英文版)

基　　金：supported by the National Research Foundation(NRF)of Korea grant funded by the Korean government(MSIT)(No.NRF-2021 M3 H4A1A02045962).

摘　　要：With the increasing prevalence of lithium-ion batteries(LIBs)applications,the demand for high-capacity next-generation materials has also increased.SiO_(x)is currently considered a promising anode material due to its exceptionally high capacity for LIBs.However,the significant volumetric changes of SiO_(x)during cycling and its initial Coulombic efficiency(ICE)complicate its use,whether alone or in combination with graphite materials.In this study,a three-dimensional conductive binder network with high electronic conductivity and robust elasticity for graphite/SiO_(x)blended anodes was proposed by chemically anchoring carbon nanotubes and carboxymethyl cellulose binders using tannic acid as a chemical cross-linker.In addition,a dehydrogenation-based prelithiation strategy employing lithium hydride was utilized to enhance the ICE of SiO_(x).The combination of these two strategies increased the CE of SiO_(x)from 74%to87%and effectively mitigated its volume expansion in the graphite/SiO_(x)blended electrode,resulting in an efficient electron-conductive binder network.This led to a remarkable capacity retention of 94%after30 cycles,even under challenging conditions,with a high capacity of 550 mA h g^(-1)and a current density of 4 mA cm^(-2).Furthermore,to validate the feasibility of utilizing prelithiated SiO_(x)anode materials and the conductive binder network in LIBs,a full cell incorporating these materials and a single-crystalline Ni-rich cathode was used.This cell demonstrated a~27.3%increase in discharge capacity of the first cycle(~185.7 mA h g^(-1))and exhibited a cycling stability of 300 cycles.Thus,this study reports a simple,feasible,and insightful method for designing high-performance LIB electrodes.

关 键 词：LITHIUM-IONBATTERIES Siox anode Blended anode Carbon nanotubes Carboxymethyl cellulose Conductive binder network 

分 类 号：TB3[一般工业技术—材料科学与工程]