(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；
2. 中國鋁業(yè)股份有限公司鄭州研究院，鄭州 450041)
摘 要: 以尿素為氮源，采用高溫?zé)崽幚矸椒ㄔ贚i4Ti5O12表面自生長一層納米尺寸厚度的TiN導(dǎo)電包覆膜。利用DSC-TG、Raman、TEM、FT-IR、XRD及恒流充放電等測試手段，研究熱處理工藝對(duì)材料結(jié)構(gòu)、形貌及電化學(xué)性能的影響。結(jié)果表明：使用適中的尿素原料含量可以獲得均勻連續(xù)、厚度適中的TiN導(dǎo)電膜，較高的熱處理溫度有利于促進(jìn)TiN的生成，而較短的熱處理時(shí)間可以保持材料物相的純凈和較高結(jié)晶度。在尿素含量10%(質(zhì)量分?jǐn)?shù))、熱處理溫度800 ℃、熱處理時(shí)間20 min的工藝條件下，所制備的復(fù)合材料的容量和倍率性能最優(yōu)，0.2C和3C初始放電比容量分別達(dá)到162.4和130.2 mA∙h/g。
關(guān)鍵字: Li4Ti5O12；TiN；導(dǎo)電膜；復(fù)合材料；鋰離子電池
Li4Ti5O12/TiN composites
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Zhengzhou Research Institute of CHALCO, Zhengzhou 450041, China）
Abstract:Conductive TiN self-growing film was prepared on the surface of Li4Ti5O12 particles through heat treatment with urea as nitrogen source. The crystalline structure, morphology and electrochemical properties were studied by DSC-TG, Raman, TEM, FT-IR, XRD and charge/discharge test. The results show that using appropriate urea content uniform and continuous TiN conductive film with proper thickness can be obtained. High temperature of heat treatment can promote the growth of TiN. Short time of heat treatment can keep high purity and crystallinity of material. The best process for synthesizing Li4Ti5O12/TiN composite is urea mass fraction of 10%, heat treatment temperature of 800 ℃ and heat treatment time of 20 min. Under this condition, the initial discharge specific capacity of the material at 0.2C and 3C are 162.4 and 130.2 mA∙h/g, respectively.
Key words: Li4Ti5O12; TiN; conductive film; composite material; Li-ion battery
