Lead lithium titanium oxide with the composition PbLi 2 Ti 6 O 14 has been successfully synthesized by the rheological phase reaction method and exhibited excellent electrochemical properties as an anode material for lithium ion batteries. The results show that PbLi 2 Ti 6 O 14 with a three-dimensional network could reversibly accommodate about four lithium ions (146.4 mAh g −1 ) per unit formula along with the partial reduction of Ti 4+ to Ti 3+ , and the multiple steps of lithium insertion during the cycling process were explained from crystallographic view point. Moreover, when the load current density was increased from 100 to 200, to 400, and then to 800 mA g −1 , the corresponding charge capacity was 134.8, 119.6, 103.7, and 86.3 mAh g −1 , respectively, and the capacity recovered to 128.7 mAh g −1 if the current density was returned to 100 mA g −1 . Thus, the PbLi 2 Ti 6 O 14 , with certain specific capacity, excellent cycling performance and rate capability, can be used as a promising anode material for lithium ion battery applications.
Jundong Zhang,Haoxiang Yu,Nengbing Long,Tingting Liu,Xing Cheng,Runtian Zheng,Haojie Zhu,Wuquan Ye,Jie Shu
As a promising anode material , PbLi 2 Ti 6 O 14 has attracted the attention of many researchers. In this work, a series of PbLi 2 Ti 6 O 14 are prepared by solid state method at five different calcination temperatures and used as anode materials in lithium ion batteries . Through a series of tests, the results show that the phase purity, morphology and electrochemical performance of PbLi 2 Ti 6 O 14 can be seriously influenced by calcination temperature. When the calcination temperature is 900 °C, the phase-pure PbLi 2 Ti 6 O 14 can be obtained with relatively small particle size, excellent cycle performance and outstanding lithium ion diffusion behavior . It provides an initial charge capacity of 151.3 mA h g −1 at 100 mA g −1 . After 100 cycles, it shows a reversible capacity of 142.0 mA h g −1 with superior capacity retention of 93.85%. In contrast, PbLi 2 Ti 6 O 14 formed at 800 °C displays an unsatisfactory performance due to the presence of impurity, even though it has the smallest particle size and the largest lithium ion diffusion coefficient among the five samples. The reversible capacity is only 82.6 mA h g −1 after 100 cycles with capacity retention of 53.9%. In order to further study the lithium ion diffusion behavior of PbLi 2 Ti 6 O 14 , the in-situ X-ray diffraction technique is also implemented. It is found that during the lithiation/delithiation process, the stable framework can effectively inhibit the volume change and ensures the excellent electrochemical performance of PbLi 2 Ti 6 O 14 .
危险品化学品经营许可证（带存储）