Novel composite anode materials for lithium secondary battery

新型锂二次电池复合负极材料

• 批准号: 18350106
• 负责人: TAKEDA Yasuo
• 金额: $ 10.37万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18350106/
• 关键词: Power sources; Rechargeable lithium ion batteries; Negative electrode materials; Li reactive mechanisms; 複合負極; 窒化物系負極; 合金系負極; シリコン負極; 複合電極; Power sources; Rechargeable lithium ion batteries; Negative electrode materials; Li reactive mechanisms; 複合負極; 窒化物系負極; 合金系負極; シリコン負極; 複合電極

Lithium ion batteries are principle and promising power sources for a wide variety of electronics. Electrode material is a key for developing further lithium ion batteries, which are likely to require good reliability and high energy density. However, graphitic carbon that is currently used as negative electrode material in the commercial Li-ion batteries appears to be unsatisfied due to low theoretic capacity of 372 mAh g^-1 and poor thermal stability under lithiated state. Therefore, there is even-increasing research in the feasibility of the replacement of graphitic anodes. By this motivation, a series of novel negative electrode materials that demonstrate extremely high capacities and different Li reactive mechanisms have been proposed in this group.1.Li-alloy based compositesThe volume effects of silicon upon Li insertion and extraction can be effectively suppressed by designing a composite microstructure containing that ultrafine silicon are uniformly dispersed in a ductile condu … More cting carbonaceous matrix with electron/ion conductivity. By this way, several types of Si-based composites have been developed by means of pyrolyis process in accompany with high-energy mechanical milling step. The pyrolyzed carbon can mostly function as an elastic network with electron/ion conductivity that permits the silicon in the matrix to operate while maintaining .electrode integrity. The Si-based composites have large capacity of ca. 1000 mAh g^-1 and good cycling performance, as well as acceptable first cycle efficiency. We expect that further optimization of these Si-composite based anodes might lead to practical lithium-ion batteries with high energy density.2.Lithium transition metal nitrides based composite electrodeWe have developed a series of lithium mixed transition metal(co-doped)nitrides with high electrochemical capacity and good cyclability. For producing these compounds, a combination of a solid-state reaction under an appropriate temperature and a high-energy mechanical milling step was involved. Research reveals that the granular structure of the nitrides shows obvious effects upon the electrochemical behavior. The lithiated compounds can be used in several ways to form new composite electrodes which demonstrate high insertion capacity, 100 % first cycle efficiency and excellent capacity retention ability. Therefore, they are promising anode candidates for further Li-ion batteries. Less

锂离子电池是多种电子产品的原理，也是承诺电源。电极材料是开发进一步的锂离子电池的关键，该电池可能需要良好的可靠性和高能量密度。但是，由于理论能力低372 mAh g^-1，目前被用作商用锂离子电池中的负电极材料的图形碳似乎不满意，并且在有限状态下的热稳定性差。因此，在替换图形阳极的可行性方面存在均匀的研究。 By this motivation, a series of novel negative electrode materials that demonstrate extremely high capacities and different Li reactive mechanisms have been proposed in this group.1.Li-alloy based compositionsThe volume effects of silicon upon Li insertion and extraction can be effectively suppressed by designing a composite microstructure containing that ultrafine silicon are uniformly Dispersed in a ductile conduit … More cting carbonaceous matrix with electron/ion电导率。通过这种方式，通过高能机械铣削步骤，通过Pyrolys工艺开发了几种类型的基于SI的组合物。热解的碳主要充当具有电子/离子电导率的弹性网络，该网络允许基质中的硅在维持.Electrode完整性的同时运行。基于SI的组合物具有较大的CA。 1000 mAh g^-1和良好的循环性能以及可接受的第一周期效率。我们预计，基于SI-Composite的阳极的进一步优化可能导致具有高能量密度的实用锂离子电池。2。基于基于氮的复合材料电溶剂已开发了一系列具有高电化学能力的锂混合过渡金属（共掺杂）硝酸盐。为了产生这些化合物，涉及在适当温度下的固态反应和高能机械铣削步骤的组合。研究表明，氮化物的颗粒结构对电化学行为显示出明显的影响。有限的化合物可以以几种方式使用，以形成新的复合电极，这些电极表现出高插入能力，100％的第一周期效率和出色的容量保留能力。因此，他们有望提供更多的锂离子电池候选。较少的