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

自2004年3月对锂离子电池高能量密度Ni38-Sn62合金负极的研究表明，Ni3Sn4相在电极中与Li的固相反应具有良好的可逆性，使其具有高于传统负极材料的高能量密度。今年，我们重点评估了电极的长期充放电循环，以及伴随而来的电极性能的变化。结果表明，电镀Ni_lt；38&gt；Sn_&lt；62&gt；合金薄膜具有良好的阳极性能，可以实现150次以上的循环，容量为500 mA/g。关于电极晶体结构的变化，已经表明，随着合金薄膜和Li的重复循环，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态LiN合金相。FR…根据对表面形态变化的观察，证实了我们先前研究中在初始循环后观察到的孔洞闭塞。为了探索在结构和形貌发生变化的情况下仍能获得良好的循环性能的原因，我们测量了锂在电极中的扩散系数。前3个周期变化不大，数值约为6.43×10^-10；cm^2 S^-1。循环10次后，锂在固体中的扩散系数仅增加到8.04×10^-10；-10；cm^2 S；-1，表明锂在固体中的扩散系数随循环而保持。对电极的退火研究表明，电极的晶界可能是锂的扩散途径。我们相信，我们在长期使用合金阳极材料方面进行的范围内的研究将为制定锡基阳极材料设计手册做出重要贡献。较少

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