富锂锰基Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2正极材料的制备及电化学性能研究

采用新颖的一步共沉淀法合成富锂锰基Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2正极材料。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和电化学测试对合成材料的晶体结构、形貌及电化学性能进行了测试和表征。结果表明,所制备Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2正极材料具有较好的多面体形貌,材料颗粒粒径小于500 nm。在2.0~4.8 V充放电区间内,在18 m A/g进行充放电,所制备材料的首次放电比容量达到209.0 m Ah/g,循环50次后容量保持率为87.7%。     

两步固相法合成具有优良性能的钛酸锂

采用两步固相法,在交替气氛煅烧(空气预烧,氮气煅烧)下合成了尖晶石钛酸锂粉末,并且研究了煅烧气氛(空气和氮气)对不同合成阶段(预烧和煅烧)的影响。电化学测试结果表明,经空气预烧,氮气煅烧得到的样品在5 C的电流密度下,首次充电比容量高达128 m Ah/g,100次循环后容量保持率达94.5%,其电化学性能明显优于单一气氛煅烧下所得样品。分析其原因为碳酸锂的分解反应在空气气氛下较氮气气氛下更容易进行,且氮气气氛下合成LTO有氧空位的存在。     

电镀铝基负极板栅铅酸蓄电池的研究

主要研究了铝合金基体上电镀铅锡合金的工艺条件,铝合金板栅的制造,以及电镀铝合金板栅作为阀控式铅酸电池负极板栅的可行性.目的在于开发出一种铝基轻型板栅,用于铅酸蓄电池中以减轻电池的质量,提高电池的质量比能量.对铝基电镀铅锡合金(包括纯铅)板栅作为负极板栅的阀控式铅酸蓄电池进行了初步的性能测试,测试结果表明,铝基轻型板栅能...     

Synthesis and behavior ofAl-stabilized α-Ni（OH）2

Nano-fibrous Al-stabilized α-Ni(OH)2 was synthesized by the urea thermal decomposition method. The grain morphology, crystal structure, thermal stability, chemical composition and electrochemical performance of the Al-stabilized α-Ni(OH)2 were investigated. It is found that the urea thermal decomposition is an appropriate way to precipitate the Al-stabilized α-Ni(OH)2 with excellent performance. The fiber cluster TEM pattern shows that the synthesized α-Ni(OH)2 powder is composed of agglomerates of much smaller primary particles. The stabilized α-Ni(OH)2 powder with a 7.67 A c-axis distance and low thermal stabilities is obtained. The FTIR spectrum shows that the materials contain absorbed water molecules, and intercalated CO32- and SO42- anions. The experimental α-Ni(OH)2 electrode exhibits excellent electrochemical redox reversibility, high special capacity, good rate discharging performance and perfect cyclic stability. Moreover, the synthesized α-Ni(OH)2 electrode also shows high discharge capacity and cyclic stability at high temperature. The electrode specific capacity remains 290 mA-h/g at 60 ℃, which is only 15 mA-h/g lower than its ambient value, and the capacity loss is 0.9 mA-h/g per charge-discharge cycle.     

采用不同锰源合成尖晶石LiMn2O4正极材料

The spinel LiMn2O4 cathode material was synthesized with the solid-state reaction method. Four manganese compounds including electrolytic manganese dioxide (EMD), MnCO3, Mn3O4 and nano-EMD were used as Mn sources while LiOH·H2O was used as the uniform Li source. The crystal structure characteristics of these samples produced were investigated by means of XRD, SEM, particle size distribution analysis and specific surface area testing. Their electrochemical properties were also studied by comparing their specific capacity, charge and discharge efficiency and cycle performance.     

锂离子电池大电流放电性能研究进展

研究了锂离子电池大电流放电性能。讨论了最新的材料研究进展，分析了锂离子在活性材料中的扩散性能、电极材料粒度分布及粒径大小、比表面积等因素对锂离子电池大电流放电性能的影响。研究了SEI膜及电解液电导率等对锂离子电池大电流放电性能的控制作用。并针对大电流放电锂离子电池提出了电极及电池设计研究方向。     

溶胶凝胶法制备LiNi0.01Co0.01Mn1.98O3.95F0.05及其电化学性能

采用溶胶凝胶法合成锂离子电池正极材料LiMn2O4、LiNi0.01Co0.01Mn1.98O4和LiNi0.01Co0.01Mn1.98O3.95F0.05。使用X射线衍射、扫描电子显微镜对合成材料的结构及物理性能进行了表征。将合成材料作为锂离子电池正极活性材料,用循环伏安、交流阻抗及充放电测试的电化学测试方法对材料进行了电化学的研究。结果表明,合成的LiNi0.01Co0.01Mn1.98O3.95F0.05材料的初始容量高于LiNi0.01Co0.01Mn1.98O4,而循环性能优于LiNi0.01Co0.01Mn1.98O4和LiMn2O4,显示了阴阳离子复合掺杂对于阳离子单一掺杂的优势。     

炭材料贮锂机理研究的现状

对炭材料的各种贮锂机理进行了阐述,着重讲座了有机物或高聚物550℃－1000℃热解得到的无定形炭（软炭、硬炭）的高贮锂机理。认为石墨材料是石墨层间和纳米孔贮锂;无定形炭是孔隙贮锂,其贮锂能力与孔隙的大小、数量和分布有关。由此提出改善和制做高性能炭材料的措施。     

掺杂型炭材料在锂离子电池中的应用

对五种掺杂型炭材料的结构特征及其在锂离子电池中的嵌入机理作一综述,同时提出,除了炭材料的改性以外,硼、硅、磷和矾等四种元素在炭材料中的掺杂也将是未来锂离子电池发展的方向。     

MH-Ni蓄电池快速充电性能的研究

采用掺杂正极添加剂覆钴型Ni(OH)2、磺化隔膜、KOH NaOH LiOH三元电解液,成功制备出一种新型快充AA-2000型MH-Ni蓄电池,其4C(8A)充电效率达到85%,且无漏液、鼓底现象。同时,研究分析了正极添加剂、正极活性物质、隔膜类型和电解液组成等对MH-Ni蓄电池快速充电性能的影响。