Sn_(x)Fe_(1-x)O_(2)纳米花的制备及其储锂性能  

Sn_(x)Fe_(1-x)O_(2)nanoflowers:Synthesis and their performance in lithium storage

作　　者：刘玲煜 高先 周峰晨 陈小华 王建丰 王威 龚春红[1] LIU Lingyu;GAO Xian;ZHOU Fengchen;CHEN Xiaohua;WANG Jianfeng;WANG Wei;GONG Chunhong(College of Chemistry and Molecular Sciences,Henan University,Kaifeng 475004,Henan,China;College of Chemical and Materials Engineering,Xuchang University,Xuchang 461000,Henan,China;Sino(Zhejiang)Polyurethane New Material Co.,LTD.,Jiaxing 314100,Zhejiang,China)

机构地区：[1]河南大学化学与分子科学学院,河南开封475004 [2]许昌学院化工与材料学院,河南许昌461000 [3]赛诺(浙江)聚氨酯新材料有限公司,浙江嘉兴314100

出　　处：《化学研究》2025年第2期112-118,共7页Chemical Research

基　　金：国家自然科学基金项目(22475065);河南省高等学校重点科研项目(24A430037)。

摘　　要：采用共沉淀法以铁氰化钾、二氯化亚锡为原料、柠檬酸为络合剂成功制备出纳米花结构Sn-Fe普鲁士蓝类似物前驱体,并进一步煅烧获得纳米花结构Fe掺杂SnO_(2)(Sn_(x)Fe_(1-x)O_(2))双金属氧化物,并研究其电化学储锂性能。独特的纳米花结构不仅可以提供丰富的活性位点、缩短Li+扩散距离,还可以缓解体积变化,从而提升了电化学循环稳定性和倍率性能。结果表明:纳米花结构Sn_(x)Fe_(1-x)O_(2)材料在0.5 A·g^(-1)电流密度下表现高的首次充/放电比容量(1028.7/1646.9 mAh·g^(-1)),首次库仑效率62.46%,优异的循环稳定性(经过250次循环后仍具有1486.29 mAh·g^(-1)的可逆放电比容量)和高的倍率性能(3.0 A·g^(-1)和5.0 A·g^(-1)电流密度下可逆容量分别为553.9和502.1 mAh·g^(-1))。该研究结果为SnO_(2)复合材料结构设计和性能改善提供了参考。A nanoflower structure Sn-Fe Prussian blue analog precursor was successfully prepared using the co-precipitation method with potassium ferricyanide and stannous chloride as raw materials and citric acid as complexing agent.The precursor was further calcined to obtain nanoflower structure Fe-doped SnO_(2)(Sn_(x)Fe_(1-x)O_(2))bimetallic oxide as an anode material.The unique nanoflower structure provides abundant active sites,shortens the Li+diffusion distance,and mitigates volume changes during electrochemical process,thereby enhancing the electrochemical cycle stability and rate performance.Experimental results indicate that the Sn_(x)Fe_(1-x)O_(2)nanoflower material demonstrate a high initial charge/discharge specific capacity(1028.7/1646.9 mAh·g^(-1)with an initial Coulombic efficiency of 62.46%at 0.5 A·g^(-1)),and excellent cycle stability(reversible specific capacity of 1486.29 mAh·g^(-1)after 250 cycles at 0.5 A·g^(-1)),and significant rate capacity(reversible capacity at current densities of 3.0 A·g^(-1)and 5.0 A·g^(-1)is 553.9 and 502.1 mAh·g^(-1),respectively).This research offers insights for the structural design and performance enhancement of SnO_(2)composite materials.

关 键 词：锡基氧化物 类普鲁士蓝 纳米花 锂离子电池 

分 类 号：O646[理学—物理化学]