共查询到20条相似文献,搜索用时 187 毫秒
1.
2.
3.
提出一种新型的可充电水性锌离子电池(AZIB),该电池由涂有活性炭的锌作为负极,氧化镍干凝胶复合电极作为正极。扫描电子显微镜表明,由于活性炭疏松多孔的结构,可以有效抑制锌枝晶的堆积生长。同时活性炭可以形成导电网络,从而大大扩大电活性表面积。在充放电循环测试中,活性炭涂层锌负极在50次循环后依然具有80%以上的容量。进一步证明了活性炭涂层的有效性。在对称电池测试中,电流密度为1 mA cm-2,比容量为1 mAh cm-2的条件下,涂层锌阳极循环160 h仍可实现稳定的镀锌/剥离过程且无短路现象。表现出优异的循环稳定性,并且没有明显的极化。该项工作为开发可充电锌离子电池提供了一个新的视角,并将加快可充电ZIB的实际应用。 相似文献
4.
5.
6.
锂金属负极在循环过程中会产生锂枝晶生长问题,导致电池循环寿命和库仑效率降低,甚至引起安全问题。锂枝晶生长的主要原因是锂金属负极中锂离子的电化学行为不受控引起的。为了解决这个问题,设计了一种由银(Ag)纳米颗粒、石墨烯和聚偏氟乙烯(PVDF)构成的锂金属负极集流体(GP@Ag)。利用银良好的亲锂特性及石墨烯对电子和锂离子的良好导电性,大大提高锂金属负极的电化学动力学性能。将所设计的集流体用于锂金属电池负极并进行电池性能测试,在1.0 C下循环350次,电池容量保持率可提高到93%,证明GP@Ag能有效抑制锂枝晶的生长,从而大大提高锂电池的循环寿命。 相似文献
7.
8.
基于锌的碱性电池例如锌镍电池、锌银电池等因锌资源丰富、比容量高而被广泛关注.但锌负极普遍存在变形、枝晶、自腐蚀、钝化等问题,降低了电极的循环寿命,影响了锌镍等电池的产业化发展.围绕解决锌负极缺陷的方法,从添加剂、材料表面改性、材料结构设计及电解液改性等方面将近年来的研究成果总结分析. 相似文献
9.
10.
11.
12.
13.
14.
15.
Vaishali Patil Arun Patil Ji-Won Choi Yoon-Pyo Lee Young Soo Yoon Hyun-Jai Kim Seok-Jin Yoon 《Journal of Electroceramics》2009,23(2-4):214-218
Lithiated layered transitional metal oxide materials of the LiMO2 type and especially LiCoO2 presents interesting specific properties as high energy density, long cycle life and constant discharging properties in a wide range of working conditions as well as a good safety. These properties made these materials excellent candidates as active compounds for high capacity cathode materials for rechargeable lithium batteries. LiCoO2 is the most common lithium storage material for lithium rechargeable batteries, used widely to power portable electronic devices. Operation of lithium rechargeable batteries is dependent on reversible lithium insertion and extraction processes into and from the host materials of lithium storage. In this study, LiCoO2 thin films were prepared by the sol–gel spin coating technique using metal acetate and citric acid as starting materials. Citric acid acts as a chelating agent, which promotes the preliminary reaction between lithium and cobalt and suppresses the precipitation of acetates. The sol–gel method is well known as one of promising thin-film preparation methods, which has good advantages such as low fabrication cost, relatively easy stoichiometry control, high deposition rate and also known as a low-temperature synthesis method for various ceramics. In addition, the crystal phases involved in the thin film can also be controlled by changing the chemical compositions of the sol. The crystallinity, microstructure and electrochemical properties of final films are also studied by XRD, SEM, AFM and galvanostatic charge/discharge cycling test. Films heat-treated under appropriate conditions exhibit high capacity and good crystallinity so those films are considered to be candidates as cathodes for thin-film micro batteries. 相似文献
16.
17.
三元层状正极材料是非常有应用前景的动力型电池正极材料,而其电化学性能还有待于进一步提高。研究了正极片厚度、隔膜类型、电解液组成和负极表面变化等因素对LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2(NCM111)材料电化学性能的影响。研究发现随着正极极片厚度的增加,电池在循环过程中容量衰减严重;相比于聚丙烯(PP)隔膜,聚酰亚胺(PI)隔膜由于具有更好的浸润性,提高了电池的放电容量;电解液中低粘度链状碳酸二乙酯(DEC)的含量对电极相容性和正极材料中过渡金属离子溶解都有较大影响;负极表面锂枝晶的形成降低了电池的循环性能。 相似文献
19.
锂离子电池材料新进展 总被引:8,自引:3,他引:5
评述了近年来有关阳极材料、电解质(非水溶液电解质、聚合物基固态电解质)和阴极材料的开发现状及发展趋势,总结了全球锂离子二次电池的生产与开发态势。 相似文献