In situ Scanning Electron Microscopy (SEM) observation of interfaces within plastic lithium batteries
In situ Scanning Electron Microscopy (SEM) observation of interfaces within plastic lithium batteries
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DOI：
10.1016/s0378-7753(98)00128-1
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发表时间：
1998-11-01
影响因子：
9.2
通讯作者：
Notten, P
中科院分区：
文献类型：
--
作者：
Orsini, F;Du Pasquier, A;Notten, P
用扫描电子显微镜准原位观察了塑料可充电锂电池的横截面。所有电池都由以LiMn2O4为活性物质的复合阴极和由嵌有锂盐溶液的聚合物基质组成的混合聚合物电解液组成。在负极方面，先后使用了三种阳极(锂、铜和石墨)。从这三种不同的结构出发，研究了电流密度对锂沉积形貌的影响。扫描电子显微镜(SEM)证明(1)苔藓状锂的积累和(2)Li-树枝晶在Li-电解液界面上的生长，并与电池的循环性能差有关。交流阻抗测量证实了界面的这种劣化。(C)1998 Elsevier Science S.A.保留所有权利。
Cross-sections of plastic rechargeable Li-cells were observed in a quasi in situ mode by means of a scanning electron microscope. All cells were composed of a composite cathode, containing LiMn2O4 as active material, and of a hybrid polymer electrolyte consisting of a polymer matrix embedded with a solution of lithium salt. At the negative side, three kinds of anodes (Li, Cu and graphite) were successively used. The influence of the current density on the morphology of the Lithium deposit was studied from these three different configurations. Scanning Electron Microscopy (SEM) evidences for (1) the accumulation of mossy lithium, and (2) the Li-dendrites growth at the interface between Li and electrolyte are given, and correlated to the poor cell cyclability. This deterioration of the interface was confirmed by AC-impedance measurements. (C) 1998 Elsevier Science S.A. All rights reserved.