(1. 中南大學(xué) 粉末冶金國家重點實驗室， 長沙 410083；
2. 長沙礦冶研究院, 長沙 410012)
摘 要: 提出了2種β-球形氫氧化鎳顆粒內(nèi)切面掃描電鏡（SEM）樣品的制備方法。 X射線衍射(XRD)和SEM分析表明： β-球形氫氧化鎳微觀結(jié)構(gòu)由大致相同的放射狀的片晶疊合組成， 而片晶大小、球粒外表面形貌是其結(jié)晶有序程度的反映； 結(jié)晶有序性差的微細(xì)粒狀微晶氫氧化鎳較結(jié)晶有序性好、 粗粒片狀氫氧化鎳具有更好的電化學(xué)性能。 探討了β-球形氫氧化鎳微觀結(jié)構(gòu)的形成機制, 認(rèn)為球粒形貌及結(jié)晶有序度可能與氫氧化鎳的晶相從α→β的陳化程度有關(guān)： 隨陳化程度的加深， 球粒表面微粒形貌從邊界模糊的粒狀向邊界清晰的六方片狀轉(zhuǎn)化， 球粒內(nèi)部晶片變大， XRD特征值（101）面半高寬和晶胞參數(shù)c變小， In/It增大。
關(guān)鍵字: MH-Ni二次電池； β-球形氫氧化鎳； 微結(jié)構(gòu)； 電化學(xué)活性； 陳化
WEI Ya-hui2, HE Wan-ning2
（1. State Key Laboratory for Powder Metallurgy,
Central South University,Changsha 410083，China;
2. Changsha Research Institute of Mineral and Metallurgy,
Changsha 410012, China）
Abstract:Two methods to prepare the samples for the study of the interior morphologies of spherical β-Ni(OH)2 by scanning electronic microscopy(SEM) were developed. The microstructures of the spherical β-Ni(OH)2 with different exterior morphologies were characterized. The sizes of the crystal faces and the exterior morphologies of spherical β-Ni(OH)2 were associated with the structure regularity characterized by X-ray diffraction(XRD). It is indicated that the spherical β-Ni(OH)2 with poorly structure regularity exhibits better electrochemical activities than that with better structure regularity. The microstructure is supposed to be related to the ageing process from α-Ni(OH)2 to β-Ni(OH)2. With the ageing process, morphologies of the spherical β-Ni(OH)2 may change from the particle-like to the layer-like and the interior crystalline faces might become larger with the phase change for Ni(OH)2.
Key words: MH-Ni rechargeable battery; spherical β-Ni(OH)2; microstructure; electro-chemical activity; ageing
