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

本项目的目的是开发一种软工艺，本发明的目的在于提供锂二次电池的阴极和阳极的电极材料的结晶度（在低温下如室温的简单程序）的合成方法，并了解电池性能对电极材料的结晶度的依赖性。锂-过渡金属双氧化物在300 ℃的低温下通过相应金属离子的酒石酸盐成功地进行了结晶化。反应产物具有差的结晶度，因此通过在高温下退火获得了宽范围的结晶度。发现电池性能，例如容量，强烈地依赖于阴极材料的堆叠。对于过渡金属氧化物，如V_2O_5，MoO_3q和TiO_2，电池容量与它们的堆积程度没有明显的关系。2）负极碳材料的合成及其电池性能：锂在碳材料中的嵌入过程决定了负极的性能。综述了近年来碱金属在炭材料中插层的研究进展。发现将硼掺杂到碳材料中可有效地改善碳材料的结晶度，并因此改善电池的容量。

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.