For Japan Toyo all-solid electrolyte*
High frequency impedance measurement system
High Frequency Impedance Measurement System
4990EDMS-120K is suitable for high-frequency AC impedance testing of solid electrolytes, with an effective test frequency of up to 100MHz, for studying high conductivity materials, particle (grain) impedance and grain boundary (grain boundary) impedance of nano-materials, and various interface impedances.
- Wide temperature range from 80K to 473K
- High frequency characteristics at 100MHz
- Sealed/pressurized sample holders available
- Fully automated temperature variables and impedance measurements using dedicated control software
When a material needs to be industrialized, we must grasp most of its properties as widely as possible and with high precision, so as not to affect the direction of industrialization at a later stage due to wrong data and cause unnecessary losses.
4990EDMS-120K is the world's first high-frequency impedance testing system for all-solid-state batteries, originally developed by Toyo Teknika Corporation (Chinese Patent No.: 201780096021X). With high frequency impedance testing up to 100MHz, this system can separate particle and particle boundary impedance of solid state electrolyte. Combined with the automatic temperature control function of -180℃ ~ +200℃, this system can provide the most accurate internal resistance measurement environment for solid-state electrolyte activation energy calculation to date.
Since its launch, the test system has sold nearly 100 sets in Japan and has been approved by many top solid state electrolyte material research institutes in Japan.
The current lithium-ion secondary batteries (now LIBs) use organic electrolytes and have problems such as "heat resistance" and "fear of leakage". On the other hand, an all-solid-state LIB requires an upper frequency of at least 100 MHz for the following reasons.
The performance of an all-solid-state LIB is strongly influenced by the transfer resistance value of lithium ions (Li+) in the solid-state electrolyte. For example, a solid electrolyte is formed by pressing a ceramic powder or by sintering it after pressing to create a solid electrolyte. Therefore, there are two paths of Li+ movement in a solid electrolyte: in the powder (intracrystalline) and at the powder-powder interface (grain boundaries), and the resistance to Li+ movement is the intracrystalline resistance component (Rbulk) and the grain boundaries. There are two components, the resistance component (Rg.b.) (see Figure 1). Capacitance is also formed at the grain boundaries (grain boundary capacitance: Cg.b.). In the development of solid electrolytes, the goal is to reduce the resistance to movement of Li+, but to achieve this, the resistance to movement of the solid electrolyte is divided into Rbulk and Rg.b. It is important to determine if it hinders). Cg.b. is too small to be detected in conventional measurements up to 1 MHz, and it is not possible to separate the two resistance components. Considering the size of Cg.b., the upper frequency needs to be at least 100 MHz and measurements need to be made over a wide frequency range from 10 mHz to 100 MHz.
Figure 1 Movement path of Li ions in solid electrolyte and simulation circuit