Compacted mesoporous titania nanosheets anode for pseudocapacitance-dominated,high-rate,and high-volumetric sodium-ion storage  

作　　者：Jiayu Yu Xiaojuan Huang Yalin He Dafu Tang Tingyi Huang Lu Liu Haobin Wu Dong-Liang Peng Dongyuan Zhao Kun Lan Qiulong Wei 

机构地区：[1]Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials,Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen,China [2]College of Energy Materials and Chemistry,College of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot,China [3]Laboratory of Advanced Materials,Department of Chemistry,College of Chemistry and Materials,Fudan University,Shanghai,China [4]State Key Laboratory of Silicon Materials,Institute for Composites Science Innovation(IncSI),School of Materials Science and Engineering,Zhejiang University,Hangzhou,China

出　　处：《SmartMat》2023年第5期109-118,共10页智能材料（英文）

基　　金：support from the National Natural Science Foundation of China(Nos.22005256,22179-113),the Natural Science Foundation of Fujian Province of China(No.2020J01034);Fundamental Research Funds for the Central Universities(Nos.20720210045,2072-0210084);Science and Technology Projects of Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)(No.HRTP-2022-19);Kun Lan acknowledges the support from the National Natural Science Foundation of China(No.22205118);the“Junma"Program of Inner Mongolia University(No.21300-5223715);the Grassland Talent Program of Inner Mongolia Autonomous Region of China.Haobin Wu acknowledges the support the Zhejiang Provincial Natural Science Foundation(No.LR21E020003);the National Natural Science Foundation of China(No.22005266).

摘　　要：Surface-redox pseudocapacitive nanomaterials show promise for fast-charging energy storage.However,their high surface area usually leads to low density,which is not conducive to achieving both high volumetric capacity and high-rate capability.Herein,we demonstrate that TiO_(2)nanosheets(meso-TiO_(2)-NSs)with densely packed mesoporous are capable of fast pseudocapacitance-dominated sodium-ion storage,as well as high volumetric and gravimetric capacities.Through compressing treatment,the compaction density of meso-TiO_(2)-NSs is up to~1.6g/cm^(2),combined with high surface area and high porosity with mesopore channels for rapid Na+diffusion.The compacted meso-TiO_(2)-NSs electrodes achieve high pseudocapacitance(93.6%of total charge at 1mV/s),high-rate capability(up to 10 A/g),and long-term cycling stability(10,000 cycles).More importantly,the space-efficiently packed structure enables high volumetric capacity.The thick-film meso-TiO_(2)-NSs anode with the mass loading of 10mg/cm^(2)delivers a gravimetric capacity of 165 mAh/g and a volumetric capacity of 223 mAh/cm^(3)at 5 mA/cm^(2),much higher than those of commercial hard carbon anode(80mAh/g and 86mAh/cm^(3)).This work highlights a pathway for designing a dense nanostructure that enables fast charge kinetics for high-density sodium-ion storage.

关 键 词：high volumetric capacity mesoporous materials sodium-ion batteries titanium dioxide 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]