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Novel anode material for Li ion secondary battery by wet deposition process.

采用湿法沉积工艺的新型锂离子二次电池负极材料。

基本信息

批准号：
15205024
负责人：
OSAKA Tetsuya
金额：
$ 27.79万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15205024/
关键词：
Li secondary batteries Formation and control of nano-structured materials Clusters ・ particles Nano materials Electrochemistry

项目摘要

From our studies on the high energy density Ni38-Sn62 alloy anodes for Li ion batteries until March 2004, we have clarified that the solid phase reaction of Ni_3Sn_4 phase in the electrode and Li shows good reversibility, therefore enabling its high energy density which exceeds that of conventional anode materials. This year, we have focused on the evaluation of a long term charge - discharge cycling of the electrode, and the accompanying changes in its electrode property.As a result, we have clarified that the electroplated Ni_<38>Sn_<62> alloy thin film shows good anode property that realizes more than 150 cycles with a high capacity of 500 mA/g. Regarding the changes in the crystal structures of the electrode, it has been indicated that with the repeated cycling of the alloy thin film and Li, the periodicity of the crystal becomes lower. Particularly, we have shown that after repeated cycling, some unreacted low crystalline LiSn alloy phases starts to be detected after discharge. Fr … More om the observations on the surface morphology changes, the occlusions of the pores observed after the initial cycles in our previous studies were confirmed. To investigate the reasons for the good cyclability obtained regardless of such changes in the structure and morphology, we measured the diffusion coefficient of Li in the electrode. No large changes were seen for the first 3 cycles, and the value was indicated to be approximately 6.43 x 10^<-10> cm^2 s^<-1>. Even after 10 cycling, the increase of the value was only to 8.04 x 10^<-10> cm^2 s^<-1>, and it was shown that the appropriate diffiusivity of Li in the solid is maintained with cycling. Studies on the annealing of the electrode have shown that the grain boundary of the electrode may be accounting as the diffusion pathways for Li.We believe that our studies that have been conducted with scope on the use of alloy anode materials in long-term use will make important contributions to the indications for the establishment of design manuals for Sn-based anode materials. Less

截止到2004年3月，我们对锂离子电池用高能量密度Ni38-Sn62合金阳极的研究表明，电极中Ni_3Sn_4相与锂的固相反应具有良好的可逆性，从而使其具有超过常规负极材料的高能量密度。今年，我们专注于评估电极的长期充放电循环，以及伴随的电极性能变化。结果表明，电镀的Ni_<38>Sn_<62>合金薄膜具有良好的阳极性能，可实现150次以上的循环，容量高达500 mA/g。关于电极晶体结构的变化，表明随着合金薄膜与锂离子的反复循环，晶体的周期性降低。特别是，我们已经证明，经过反复循环，放电后开始检测到一些未反应的低晶LiSn合金相。通过对表面形貌变化的观察，证实了我们之前研究中观察到的初始循环后气孔的闭塞。为了研究在结构和形态变化的情况下仍能获得良好循环性的原因，我们测量了锂在电极中的扩散系数。前3个周期未见大的变化，其值约为6.43 × 10^<-10> cm^2 s^<-1>。即使在循环10次后，该值的增加也仅为8.04 × 10^<-10> cm^2 s^<-1>，表明循环过程中Li在固体中保持了适当的扩散系数。对电极的退火研究表明，电极的晶界可能是Li的扩散途径。我们相信，我们在长期使用合金阳极材料的范围内进行的研究将对建立锡基阳极材料设计手册的指示作出重要贡献。少