CAJ | 학술논문

采用Pechini法合成了纳米LiTi2(PO4)3,以聚乙烯醇(PVA)为碳源,探讨了不同碳源分散方式下制备的碳包覆LiTi2(PO4)3电极电化学性能的影响因素.结果表明,纳米LiTi2(PO4)3的电化学性能主要取决于本身晶相的纯度和结晶度,其次为LiTi2(PO4)3颗粒表面碳包覆层的均匀程度.采用旋转蒸发的碳源分散方式制得的纳米LiTi2(PO4)3晶相纯度高,结晶度好, LiTi2(PO4)3颗粒表面碳包覆层均匀,电化学性能最优.4C倍率下首次放电容量达到123 mA·h/g,充放电循环200次容量保持率在85%以上.
채용Pechini법합성료납미LiTi2(PO4)3,이취을희순(PVA)위탄원,탐토료불동탄원분산방식하제비적탄포복LiTi2(PO4)3전겁전화학성능적영향인소.결과표명,납미LiTi2(PO4)3적전화학성능주요취결우본신정상적순도화결정도,기차위LiTi2(PO4)3과립표면탄포복층적균균정도.채용선전증발적탄원분산방식제득적납미LiTi2(PO4)3정상순도고,결정도호, LiTi2(PO4)3과립표면탄포복층균균,전화학성능최우.4C배솔하수차방전용량체도123 mA·h/g,충방전순배200차용량보지솔재85%이상.
Nano-lithium titanium phosphate( LTP) was synthesized by a Pechini type method. Using polyvinyl alcohol( PVA ) as a carbon source, carbon coated LTP ( LTP/C ) was prepared with different dispersing methods of carbon source. Factors that influence the electrochemical performance of LTP/C anode were dis-cussed. The results indicate that the electrochemical performance of LTP/C anode is mainly dependent on the purity of crystalline phase and degree of crystallinity of LTP and the degree of uniformity for coating carbon on the surface of LTP particles. Nano LTP/C prepared by rotating evaporation dispersing method of carbon source has high purity of crystalline phase and excellent degree of crystallinity, and the coating carbon layer on the surface of nano LTP is very uniform, as a result, excellent electrochemical performance for this LTP/C anode was obtained. An initial discharge capacity of 123 mA·h/g and a capacity retention of over 85% after 200 cycles with a coulombic efficiency above 95% were observed at a 4C rate in pH-neutral 5 mol/L LiNO3 .