電子技術(shù)畢業(yè)論word版(編輯修改稿)
2025-06-12 17:28 本頁面
【文章內(nèi)容簡(jiǎn)介】 , 180 nm and 500 nm in diameter were synthesized by using an emulsion polymerization followed by a seed growth polymerization technique. The PS spheres were assembled onto a Nicoated Cu sheet that was prepared by selfsedimentation in a slowly evaporating dispersion of PS spheres in ethanol. Using ethanol as disperse media can accelerate PS spheres sedimentation. Under the same selfsedimentated time, the bigger diameter of the PS spheres, the more order of the PS spheres template. Macroporous materials of Snbased alloy were fabricated through PS template method and . The electrochemical properties of three different pore sizes macroporous SnCu alloy electrodes was examined by galvanostatic cycling. The results demonstrated that the electrodes of macroporous SnCu alloy with pore size respectively of 100 nm, 180 nm and 500 nm can deliver reversible capacity of , and mAh g1 up to 70th cycles of charge/discharge. The cycle performance of the macroporous SnCu alloy of 180 nm in pore size is better than that of the macroporous SnCu alloy with 100 and 500nmdiameter pores. The cycle performance of the macroporous SnCu alloy with 500nmdiameter pores is the worst. It can be attributed to that the pore wall of the macroporous SnCu alloy with 500nmdiameter pores is very thin, which is easily cracking and crumbling during lithium insertion/extraction. In parison, for a SnCu alloy anode without the macroporous structure, these macroporous SnCu alloy have better cycle performance. It has revealed that the porous structure of the macroporous SnCu alloy material is of importance to strengthen mechanically the electrode and to reduce significantly the effect of volume expansion during cycling by using . In parison the cycle performance of the macroporous Sn anode with 180nmdiameter pores and the Sn anode without the macroporous structure, it is evident that the former demonstrates a better cycle performance than that of the latter. To some extent, the macroporous structure is of importance to strengthen mechanically the
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