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球磨的樣品存在幾納米厚的玻璃態(tài)表面結(jié)構(gòu)可以從文中圖1d和圖4d得到證明。從圖1d,樣品的高分辨電鏡圖上可以看出:樣品是一個核殼結(jié)構(gòu)的復(fù)合材料,內(nèi)核為結(jié)晶性良好的鈦酸鋰,(對應(yīng)層間距為0.45nm),在鈦酸鋰的表面有一層幾個納米厚的非晶玻璃態(tài)包覆層。 我們認(rèn)為這層物質(zhì)為氮化鈦,這是在球磨的過程,經(jīng)過高能球磨在鈦酸鋰的表面生成了非晶的氮化鈦層。存在這樣一個結(jié)構(gòu)也可以從圖4d原料鈦酸鋰和球磨后的樣品首次充放電曲線得到證明,從充放電曲線可以看出球磨后單相區(qū)有所增加,按照Park和Zhou的觀點增加的單相區(qū)是因為鈦酸鋰晶體的表面修飾,正是增加的單相區(qū)使其電化學(xué)性能有所提高。 |
金蟲 (正式寫手)
科研熱情熊~
| The structure of glassy-state surface in several nanometers thickness could result from fig. 1d and fig. 4d of ball-milled samples. We can conclude from the HTEM electron micrograph in fig. 1d that the sample is a core-shell composite whose core is well-crystalized lithium titanate (the interlamellar spacing is 0.45nm) covered by a several nanometer thickness non-crystal glassy layer. We suppose that the layer is consisted of titanium nitride, just because during the ball-milling procedure, non-crystal titaniun nitride generates on the surface of lithium titanate. Surely this structure exists and can be proved from the first charging/discharging curve of original lithium titanate and samples after ball-milling(Figure 4d), it could conclude that monophasefield has increased after ball-milling. According to Park's and Zhou's opinion that monophasefield attributes to the surface decoration of lithium titnate crystal, it is definitely the increasing monophasefield that improves its electrochemical performance. |

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