With the support of the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Chinese Academy of Sciences Institute of Chemistry to introduce foreign outstanding young talents, researchers from the Key Laboratory of Molecular Nanostructure and Nanotechnology of the Institute of Chemistry have successfully developed an ultra-fast charge and discharge capability. LiFePO4/C nano-composite structure lithium-ion battery cathode material. The research results were published in the recent "Adv. Mater." (2009, 21, 2710-2714) and reported on the Energy Research News website
Researchers in this group have long been committed to the research of nano- and micro-structured lithium storage electrode materials. In the previous work, they put forward a new idea of electrode material design under the guidance of "hierarchical three-dimensional hybrid conductive network". By constructing a positive and negative electrode material with both nano-level and micro-level three-dimensional hybrid conductive network structure, it greatly improves the performance of lithium-ion batteries. Energy density and power density (Adv. Mater., 2008, 20, 2878; Adv. Mater., 2007, 19, 2087; Chem. Mater., 2008, 20, 3617). Recently, they have improved the lithium storage capacity, rate performance and cycle performance of alloy anode, carbon anode and oxide anode materials through nano-microstructure design and carbon coating (Adv. Mater., 2008, 20, 1160; Adv. Funct. Mater. 2008, 18, 3941; Electrochem. Commun., 2009, 11, 1468; J. Phys. Chem. C 2009, 113, 14213).
On this basis, they designed a three-dimensional hybrid conductive network structure electrode material (Figure 1b), and successfully verified on the cathode material LiFePO4 (Figure 1a). In this study, the researchers evenly embedded LiFePO4 nanoparticles in porous carbon (Figure 1a) to develop a composite cathode material with excellent rate performance. The battery test results show that the composite cathode material can not only complete the ultra-fast charging within 16 seconds and complete the ultra-fast discharge process within 16 seconds (Figure 2a), but also after 700 charge-discharge cycles at a rate of 1.5C, the capacity retention rate is still It can reach more than 97% (Figure 2b).
