Mg对锂二次电池负极Li-B合金中骨架结构与性能的影响  

Effect of Mg on the skeleton structure and properties of Li-B alloy for lithium secondary batteries anode

作　　者：归伊娜 刘志坚[1] 陈立宝 黄海峰 宁慧龙 GUI Yina;LIU Zhijian;CHEN Libao;HUANG Haifeng;NING Huilong(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

机构地区：[1]中南大学粉末冶金研究院

出　　处：《功能材料》2019年第9期9027-9032,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51771236)

摘　　要：在传统热电池负极材料Li-B合金中,加入Mg元素能够提高极片的抗氧化性、抑制自放电,并能够有效提升热电池的放电稳定性。在锂二次电池负极材料Li-B合金中掺杂Mg元素,制备获得Li-B-Mg合金,通过Li-Mg固溶体强化LiB化合物骨架结构,缓解坍塌问题。通过X射线衍射仪、扫描电子显微镜、电化学充放电测试和交流阻抗谱对两种合金的物相、形貌、电化学性能进行了表征。结果表明,Mg元素对Li-B合金的放电性能有所提升,并能够一定程度支撑LiB纤维骨架结构,缓解坍塌问题。这对于Li-B合金作为锂二次电池负极的潜在材料有一定的奠基作用。In the conventional thermal battery anode lithium boron alloy, the addition of magnesium can improve the oxidation resistance of the electrode, inhibit self-discharge, and effectively improve the discharge stability of the thermal battery. Lithium-boron-magnesium alloy was prepared by adding magnesium element to lithium boron alloy for lithium secondary battery positive electrode. Lithium-magnesium solid solution was used to strengthen the lithium-boron composite skeleton structure, which alleviated the collapse problem of lithium-boron-magnesium alloy. The phase, morphology and electrochemical properties of the two alloys were characterized by X-ray diffraction, scanning electron microscopy, electrochemical charge and discharge tests and AC impedance spectroscopy. The results show that the magnesium element improved the discharge performance of the lithium boron alloy, and supported the lithium boron fiber skeleton structure to some extent, which reduced the collapse of the lithium boron alloy. This had a certain foundation for the potential material of Li-B alloy as the anode for lithium secondary batteries.

关 键 词：LI-B合金 锂二次电池负极 骨架结构 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]