EIS: A Powerful Technique
Electrochemical Impedance Spectroscopy (EIS) is a powerful technique with a broad range of research applications. Click on a link below to view the Application or Technical Note.
Electrochemical Impedance Spectroscopy (EIS) is now ubiquitous in the electrochemical research, development, and quality-control world. The technique compares the observed data from an EIS scan to a hypothetical model network of resistors, capacitors, inductors, and other theoretical components.
This Application Note describes a series of EIS measurements made on a Li ion secondary battery rated to have impedance below 500 µΩ at 1 kHz.电化学阻抗谱（EIS）是获取电化学系统信息的一种强有力的测试方法。它常常被应用在测试新型的能源转换和存储类电化学器件（ECS），包括电池，燃料电池和超级电容器。EIS可以被用到新设备发展的各个阶段，一直从半电解池反应的机理和动力学初始评估到电池包的质量控制。
Electrochemical Impedance Spectroscopy (EIS) measurements are more often performed in potentiostatic mode than under galvanostatic mode. The reason is partly convention and partly driven by materials. For example, coatings and corrosion-resistant materials have a higher impedance, so that the application of a 10 mV sine wave results in a nA (or smaller) response. Conversely, in a low-impedance device such as a large supercapacitor or battery, the application of a 10 mV sine wave produces amperes of current-flow, possibly changing the state of the device—or worse, yet, damaging it. For devices with intermediate impedance (e.g., smaller batteries, smaller supercapacitors, and sensors), either potentiostatic or galvanostatic modes may be used.