尿素辅助高性能LiFePO4正极材料的制备及电化学性能研究  

Preparation of LiFePO4anode assisted by urea and its electrochemical property

作　　者：孙锴 王鑫 邓腾 杜振强 牛瑶 王娟 Sun Kai;Wang Xin;Deng Teng;Du Zhenqiang;Niu Yao;Wang Juan(School of Mechanical and Electrical Engineering,Xi'an University of Architecture and Technology,Shaanxi Key Laboratory of Nanomaterials and Technology,Xi'an 710055)

机构地区：[1]西安建筑科技大学机电工程学院陕西省纳米材料与技术重点实验室,西安710055

出　　处：《化工新型材料》2020年第4期54-59,共6页New Chemical Materials

基　　金：国家自然科学基金(51202179);陕西省科技厅资助项目(2018GY-166、2019TD-019);陕西省教育厅自然科学基金(16JS058、18JS058);西安市科技局资助项目[201805033YD11CG17(7)、2019219914SYS014CG036]。

摘　　要：通过尿素辅助软模板法研究了表面活性剂亲油基的链长对LiFePO4/C复合材料形貌及其电化学性能的影响。结果表明,在尿素作用下,亲油基的链长对颗粒生长和成型起到了关键作用,在室温下,样品LFP-DTABurea在0.1C倍率下首次放电比容量达到了153.1mAh/g,50次循环后放电比容量保持在123mAh/g,容量保持率为84.9%;10C倍率下放电比容量达到79.5mAh/g。该研究结果为其他锂二次电池甚至新型二次电池电极材料的研究提供了参考,同时表明软模板法在纳米材料合成中具有广阔的应用前景。The effect of the chain length of the surfactant lipophilic group on the morphology and electrochemical properties of LiFePO4/C composites was studied by the urea-assisted soft template method for the first time.The results shown that the chain length of the lipophilic group played a crucial role in influencing the particles under the actions of urea.At room temperature,the initial discharge specific capacity of LFD-DTAB-urea reached 153.1mAh/g at the rate of 0.1C,the discharge specific capacity remained 123mAh/g after 50cycles,the capacity retention rate was 84.9%,and the discharge specific capacity reached 79.5mAh/g at 10C.The results provided a reference for the research of other lithium secondary batteries and even new secondary battery electrode materials,and shown that the soft template method had a broad application prospect in the synthesis of nano-materials.

关 键 词：磷酸铁锂 锂离子电池 软模板法 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]