Announcement of Writing a Book on Lithium-Ion Secondary Batteries

From the production of battery cells to charge and discharge cycle testing, disassembly, and investigation of degradation components.

When investigating the degradation mechanisms of secondary batteries, it is important to analyze the deposits on the electrode surface. At MST, we conduct TOF-SIMS measurements under controlled atmospheric conditions, allowing us to evaluate the chemical state of the electrode's outermost surface without alteration due to exposure to the atmosphere. Additionally, by consistently performing measurements from charge-discharge cycle tests to the electrode surface, we can examine the correlation between the state of charge-discharge and the condition of the deposits on the electrode surface.

• Contract Analysis
• Contract measurement

Consistent evaluation from battery cell manufacturing, degradation testing, disassembly, to investigation of state changes due to degradation.

A degradation test was conducted on a battery cell made with LiCoO2 as the positive electrode, graphite as the negative electrode, and LiPF6/EC:DEC as the electrolyte, which was left in a constant temperature chamber at 60°C in a charged state of 4.2V for about one week. After that, the cell was disassembled and cleaned in an Ar atmosphere, and TOF-SIMS analysis of the negative electrode graphite was performed. Before the test, fragments derived from the binder and electrolyte salt were confirmed, and after the test, fragments such as Li3PO4 and PF3O, which are believed to have been generated due to the degradation of the electrolyte salt, as well as fragments from Li2CO3, were observed. Additionally, the detection of Co suggests the possibility of leaching of the positive electrode active material.

• Contract Analysis
• Contract measurement

We will dismantle and analyze regardless of the experimental cell.

This is an example of evaluating the organic solvent components of an electrolyte using GC/MS analysis. The measurement of the electrolyte in lithium-ion secondary batteries revealed that the main components of the organic solvents are ethylene carbonate (EC) and propylene carbonate (PC). Other components detected included diethyl carbonate (DEC) and sulfur compounds, with the latter possibly originating from additives.

• Contract measurement

Fukuda Co., Ltd. has been pursuing leak detection for 60 years and is committed to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing properties. We will propose the appropriate testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

The "Mechanical Stitching Method" by Nichinichisui Road Machinery Co., Ltd. is a new technique that allows for the repair of metal cracks without the application of heat. By using special bolts and reinforcement plates, cracks are physically removed, and repairs are made without causing any thermal impact on the base material. Repairs can be carried out in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. ◎ For more details, please contact us. ◎ If a detailed technical explanation is needed, please contact us.

Fukuda's new flagship model. - Masterless type (FLA-0200 series) - General type (FLA-0201 series) Two models of air leak testers. With the mastering correction function, high-precision measurements can be achieved in a short time. Please take a look at the catalog.

● This is a leak testing device for small electronic components that does not use fluorinated inert liquids (PFAS-free). ● There is no longer a need for unstable visual confirmation through liquid immersion testing. It adopts a quantitative testing method that allows for stable pressure leak testing. ● It is a tabletop leak testing device specifically for gross leaks, with accuracy equal to or greater than that of liquid immersion testing. ● The detectable range is approximately 1×10⁻² Pa·m³/s to 1×10⁻⁶ Pa·m³/s (varies depending on the target product). ● It is suitable for sealed structures ranging from a few millimeters to a maximum of 80 × 70 mm. Please feel free to contact us for more information!

The "Mechanical Stitching Method" by Nichinichisui Road Machinery Co., Ltd. is a new technique that allows for the repair of metal cracks without the application of heat. By using special bolts and reinforcement plates, cracks are physically removed, and repairs are made without causing any thermal impact to the base material. Repairs can be carried out in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. ◎ For more details, please contact us. ◎ If a detailed technical explanation is needed, please contact us.