权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Analysis and Application on the Functions of Oxide/Carbon Hetero-Junctions during Electrochemical Insertion/Extraction

氧化物/碳异质结电化学插入/脱出过程的分析及应用

基本信息

批准号：
12650804
负责人：
NISHINA Tatsuo
金额：
$ 2.37万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Aluminum current collector of lithium secondary batteries forms compact passivated film according to the high field model in the organic electrolyte solutions including fluorine element. However, the corrosion of this passivated film and aluminum substrate increases the leak current and reduces the battery performance. Based on these points of view, the controlling of passivated film at aluminum current collector has been investigated as functions of aluminum foil purity, surface treatment, composite cathode pressing condition, electrolyte composition, and formation in the battery fabrication processes. It was clear that the charging/discharging cycle performance was improved by reducing leak current of passivated film by adding some additional metal impurities to the aluminum current collector, by applying surface heating of aluminum, by adding small amount of water to the cathode composite, and by adding oxygen donor such as water and / or LiNO_3 to the electrolyte solution.Research on cathode materials for 5 V class lithium secondary batteries is a trend in recent researches. However, the passivated film characteristic of a cathode current collector is still not well known. We investigated the anodic passivation behavior of some valve metals at such high anodic potentials in organic electrolytes for lithium secondary batteries. As a conclusion, we should use aluminum as a cathode current collector for 5 V class lithium secondary batteries since it formed a high insulating film with high tolerant voltage at the metal surface.In conclusions, Hetero-contact of passivated film on the current collector/carbon conductive additives controls the contacting resistance of the positive electrode, and this controls the total charging/discharging rate of lithium insertion/deinsertion of lithium secondary batteries.

锂二次电池的铝集电体在含氟元素的有机电解液中形成致密的钝化膜。然而，这种钝化膜和铝衬底的腐蚀增加了泄漏电流，降低了电池的性能。基于这些观点，研究了在电池制造过程中，铝箔纯度、表面处理、复合正极压制条件、电解液组成和化成对铝集电钝化膜控制的影响。通过在铝集电体中添加金属杂质、对铝进行表面加热、在正极复合材料中加入少量水、在电解液中添加给氧体等方法来降低钝化膜的泄漏电流，从而改善了充放电循环性能。5V级锂二次电池正极材料的研究是近年来研究的一个趋势。然而，阴极集电体的钝化膜特性仍不是很清楚。研究了锂二次电池用阀类金属在有机电解液中的阳极钝化行为。综上所述，铝作为5V级锂二次电池的正极集电体是可行的，因为铝在金属表面形成了一层高耐压的高绝缘膜。综上所述，集电体/碳导电添加剂上钝化膜的异质接触控制了正极的接触电阻，从而控制了锂二次电池的总充放电速率。