微波原位制备作为锂离子电池电极材料的石墨烯/TiO_(2)纳米复合物  

In-situ Synthesis of Graphene/TiO_(2) Nanocomposites via Microwave as Anode Materials for Li-ion Batteries

作　　者：杨良伟 陈昊然 金鑫[1] 刘伟 于新民[1] 刘俊鹏[1] 宋环君 李晓东[1] 于艺 王鹏 张宝鹏 Yang Liangwei;Chen Haoran;Jin Xin;Liu Wei;Yu Xinmin;Liu Junpeng;SongHuanjun;Li Xiaodong;Yu Yi;Wang Peng;Zhang Baopeng(Research Institute of Aerospace Special Materials and Processing Technology,Beijing 100074,China)

机构地区：[1]航天特种材料及工艺技术研究所,北京100074

出　　处：《稀有金属材料与工程》2022年第3期821-826,共6页Rare Metal Materials and Engineering

基　　金：Sponsored by Beijing Municipal Science&Technology Commission(Z171100005317001)。

摘　　要：通过改造的家用微波炉,实现了原位高效制备石墨烯/TiO_(2)纳米复合物。结果表明:微波辅助法能够在商用锐钛矿型TiO_(2)纳米颗粒表面均匀制备石墨烯纳米片,通过SiO_(2)/Si的剧烈电晕放电,其制备时间仅需数分钟(最短3 min)。石墨烯纳米片的尺寸大约为50 nm且缺陷很少。TiO_(2)晶体结构仍为锐钛矿型,主要归功于极短的制备周期和较低的反应温度(600~700℃)。石墨烯具有优异的电导率,可以提升锂离子扩散速率、提高电子传输速率并降低接触电阻。在1 C(170 mA·g^(−1))条件下石墨烯/TiO_(2)纳米复合物的电池放电比容量提高了2倍。与商业化锐钛矿型TiO_(2)纳米颗粒相比,在1 C到5 C的不同充放电倍率下,石墨烯/TiO_(2)纳米复合物的比容量差距显著扩大。Through the modified household microwave oven system,the graphene-based nanocomposites were in-situ and efficiently synthesized.Results show that the graphene nanosheets can be uniformly generated on the surface of the commercial anatase TiO_(2) nanoparticles by microwave-assisted method in a few minutes(the minimum duration is 3 min)through the acute corona discharge of SiO_(2)/Si.The size of graphene nanosheet is about 50 nm,and few defects can be observed.The crystal structure of anatase TiO_(2) remains due to the short production period and low synthesis temperature(600~700℃).The excellent electrical conductivity of graphene can improve the Li ion diffusion and the electron transport,and decrease the contact resistance at the interface of electrode/electrolyte.The as-prepared graphene/TiO_(2) nanocomposite electrode shows a two-fold increase of capacity with good cycling stability under the condition of 1 C(170 mA·g^(-1)),compared with the traditional TiO_(2) nanoparticles.The specific capacity gap of graphene/TiO_(2) nanocomposite is substantially widened under different charge-discharge rates(1~5 C),compared with that of the commercial anatase TiO_(2) nanoparticles.

关 键 词：石墨烯/TiO_(2)纳米复合物 微波辅助 电晕放电 原位制备 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]