李昌明
,
黄启明
,
张仁元
,
李伟善
,
赵灵智
,
胡社军
金属学报
用电沉积方法直接在铜集流体上分别制备出锂离子电池负极材料锡薄膜电极和锡颗粒电极。用X射线衍射、扫描电镜、循环伏安及充放电实验研究比较了二电极的性能。结果表明，在氟硼酸盐溶液中使用以醛类为主的复合添加剂，在静止条件下制得锡薄膜电极，搅拌条件下制得锡颗粒电极；锡薄膜电极比锡颗粒电极具有较优的初始嵌锂容量和循环稳定性：薄膜电极首次放电比容量达到了787mAh/g，40次循环时放电比容量仍保持630 mAh/g；而颗粒状电极首次放电比容量只有576 mAh/g，至20次循环时，放电比容量降到了150mAh/g。
关键词:
电沉积
,
Tin
,
Lithium ion battery
,
Anode materials
郭德超
,
曾燮榕
,
邓飞
,
邹继兆
,
盛洪超
新型炭材料
以天然鳞片石墨为原料,利用电泳插层法制备出具有适当膨胀体积的微膨石墨,石墨的结构缺陷增多,具有较大的比表面积和增大的石墨层间距. 微膨石墨的可逆容量可以达到521 mAh/g;在0. 2 C倍率循环充放电30次容量最佳可保持在99%以上,在1. 0 C循环50次其容量可稳定在188 mAh/g,且表现出良好的倍率性能. 微膨石墨电化学性能的改善得益于其具有适当的比表面积及内部结构的改变. 交流阻抗测试显示微膨石墨的SEI膜阻抗和电荷传递阻抗小于鳞片石墨,具有良好的电化学活性.
关键词:
微膨石墨
,
负极材料
,
倍率性能
,
循环稳定性
Jian XIE
材料科学技术（英）
Li-storage intermetallic compound FeSb2 was prepared by solvothermal method and was studied as a promising anode material for secondary lithium-ion batteries. The as-prepared powder was characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical Li-storage performances of this intermetallic anode were evaluated in a two-electrode cell Li/LiPF6(EC+DMC)/FeSb2. It was found that the particle size of FeSb2 powder is in nanoscale and this intermetallic anode exhibited enhanced cycling behavior comparing to its microscaled counterpart prepared by levitation-melting/ball-milling route.
关键词:
FeSb2
,
null
,
null
,
null
,
null
Jian XIE
,
Xinbing ZHAO
,
Gaoshao CAO
,
Mingjian ZHAO
,
Yaodong ZHONG
材料科学技术（英）
Some transition metal antimonides were prepared by levitation melting and subsequent ball-milling. The electrochemical behaviors of these materials as new candidate negative electrode materials in lithium ion secondary batteries were investigated. It was found that they exhibited significantly larger volumetric capacity than carbon-based materials. The formation and composition of solid electrolyte interface (SEI) film were characterized by electrochemical impedance spectroscopy (EIS) and Fourier transform infra-red (FTIR) spectroscopy.
关键词:
Antimonide
,
null
,
null
,
null
