Soft process for the Synthesis of Electrode Materials of Lithium Secondary Batteries

本项目的目的是开发一种合成锂二次电池正负极材料的软工艺(一种简单的低温合成过程)，并了解电极材料结晶度对电池性能的影响。1)正极材料的合成及其结晶度对电池性能的影响：在300ﾟC的低温下，通过各自金属离子的酒石酸盐成功地合成了锂过渡金属双氧化物，反应产物结晶度较差，因此通过高温热处理获得了结晶度较大的产物。电池的性能，例如容量，被发现强烈依赖于正极材料的结晶度。另一方面，对于过渡金属氧化物，如V_2O_5、MoO_3Q和TiO_2，电池容量与它们的结晶度没有明显的关系。2)负极碳材料的合成及其电池性能：负极性能是由锂嵌入碳材料的过程决定的。综述了碱金属插层碳材料的最新研究成果。在碳材料中掺入硼可以有效地改善碳材料的结晶度，从而提高电池的容量。

The purposes of this project are to develop a soft process for synthsis (a simple procedure at low temperature as room temperature) of electrode materials of cathode and anode of lithium secondary batteries and to understand the dependence of battery performance on crystalolinity of electrode materials.l) Synthesis of cathode materials and effect of crystallinity on battery performance : lithium-transition metal double oxides were successfully synthsized via tartarates of respective metal ions at low temperatures as 300ﾟC.The reaction products had poor crystallinity and so a wide range of crystallinity was obtained by annealing them at high temperatures. The battery performance, for example capacity, was found to depend strongly on the crystalliniti of cathode materials. For the transition metal oxides, such as V_2O_5, MoO_3 qand TiO_2, on the other hand, battery capacity did not show a marked dependence on their crystallinity2) Synthesis of carbon materials for anode and their battery performance : Anode performance is know to be governed by the intercalation process of lithium into carbon materials. The recent results on intercalation of alkali metals into carbon materials are reviewed. The boron doping into carbon materials was found to be effective to improve the crystallinity of carbon materials and, as a consequence, to improve the capacity of the batteries.