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Development of new high-energy anode material for large-scale secondary battery using metallic nano-particle

利用金属纳米颗粒开发新型大型二次电池高能负极材料

基本信息

批准号：
10450320
负责人：
WAKIHARA Masataka
金额：
$ 7.23万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The explosive demand for portable electronic devices has brought about an increase in the importance of compact, lightweight and reliable power sources. One of the most probable candidates for such requirements is lithium rechargeable battery. One is a lithiated transition metal oxide as cathode and the other graphite anode. However, it is well known that the quantity of active material per unit weight or volume determines the energy density of the battery. The graphite anode material commonly used in lithium rechargeable batteries suffers from small capacity per unit weight about 350mAh/g and/or per unit volume due to its low density. To overcome these disadvantages, considerable amounts of attempts have been made by several workers to find out alternative anode materials in place of graphite anodes. In this report, crystalline MnVィイD22ィエD2OィイD26ィエD2 and MnMoOィイD24ィエD2 was synthesized by a polymer gellation and solidstate reaction method and investigated for its physical and electrochemical properties as an anode material for lithium secondary battery. The physical properties of characterization was carried out by thermal analysis (TG/DTA), FT-IR, and SEM. Structural analysis by powder XRD, and spectroscopic analysis by XANES shows that the synthesized compound is MnVィイD22ィエD2OィイD26ィエD2 with brannerite structure. The Li insertion of MnVィイD22ィエD2OィイD26ィエD2 anode during the first charge showed a large capacity of about 1400 mAh/g, accompanied by irreversible structural transformation into amorphous material. Despite its structural transformation to amorphous during the first lithiation, subsequent cycles showed a capacity of about 800mAh/g. This report presents the advantage of this material over existing anode material and discusses the mechanism underlying the electrode process.

对便携式电子设备的爆炸性需求增加了紧凑、轻便和可靠的电源的重要性。最可能满足这种要求的候选者之一是锂充电电池。一种是锂化过渡金属氧化物作阴极，另一种是石墨作阳极。然而，众所周知，每单位重量或体积的活性物质的数量决定了电池的能量密度。锂可充电电池中常用的石墨负极材料由于密度低，单位重量和/或单位体积的容量较小，约为350mAh/g。为了克服这些缺点，一些工作人员已经进行了大量的尝试，以寻找替代石墨阳极的阳极材料。本文采用聚合物凝胶法和固相反应法制备了MnV的结晶MnV φ φ D22 φ φ D2O φ φ D26 φ φ D2和MnMoO φ φ D24 φ φ D2，并对其作为锂二次电池负极材料的物理和电化学性能进行了研究。通过热分析（TG/DTA）、红外光谱（FT-IR）和扫描电镜（SEM）对表征物性进行了表征。粉末XRD结构分析和XANES光谱分析表明，合成的化合物为锰镍矿结构的MnV γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。在第一次充电过程中，MnV小伙伴D22小伙伴D2O小伙伴D26小伙伴D2负极的锂插入量显示出约1400 mAh/g的大容量，并伴有不可逆的非晶态结构转变。尽管在第一次锂化过程中其结构转变为非晶态，但随后的循环显示其容量约为800mAh/g。本报告介绍了这种材料相对于现有阳极材料的优势，并讨论了电极工艺的机制。