Case study of failure analysis of oxide-based all-solid-state batteries

It has high safety and can be used in various environments! Consistent analysis is possible.

We will introduce a case where a series of analyses, from identifying failure points to cross-sectional observation, was conducted on an oxide-based all-solid-state battery that was destroyed during reliability testing. Heat generation analysis revealed a strong tendency for heat generation on the side, and X-ray transmission observation showed a white linear contrast anomaly near the boundary where heat generation was observed in the X-ray transmission image. It is suspected that some abnormality is occurring in the white line area. When CP cross-sectional SEM observation was performed on the area where the anomaly was visible, layer delamination was observed. It is inferred that delamination occurred between the current collector and electrolyte layers due to the positive (negative) electrode layer expanding and contracting repeatedly during reliability testing. 【Case Overview】 ■ Sample Information: Oxide-based all-solid-state battery that experienced degradation due to charge and discharge testing ■ Heat Generation Analysis Result: A strong tendency for heat generation was observed on the side ■ Other Analysis Contents: - X-ray transmission observation - CP cross-sectional observation and elemental analysis using SEM *For more details, please refer to the PDF document or feel free to contact us.

• Contract Analysis

The purity of the electrolyte greatly affects the performance of the battery! It suppresses the volatility of sulfur components and converts them into a form that can be detected by IC.

We would like to introduce an example of analyzing the purity of phosphorus pentasulfide using ion chromatography for the composition analysis of raw materials for all-solid-state batteries. Phosphorus pentasulfide is one of the raw materials used in the production of electrolytes for sulfide-based all-solid-state batteries. As a pretreatment for IC measurement, the powder of phosphorus pentasulfide was dissolved in alkaline water and converted into phosphate and sulfide salts. Subsequently, sulfide ions were oxidized to sulfate ions to prepare the IC measurement solution. For more details, please refer to the published catalog. 【Solid Electrolytes (Partial)】 ■Li3PS4 ■Li7P3S11 ■Li6PS5Cl ■Li6PS5Br *For more information, please refer to the PDF materials or feel free to contact us.

• Analytical Equipment and Devices

It is possible to perform non-destructive testing from fault location identification to internal observation! High-precision identification of heat generation areas can be achieved.

Thermal analysis is a method for identifying defective areas by detecting heat generated at leak points due to applied voltage using a high-sensitivity InSb camera. By detecting the weak heat generated from shorts and leaks with a high-sensitivity InSb camera, it is possible to non-destructively identify the failure points of electronic components such as semiconductors. Furthermore, non-destructive observation can also be performed using X-ray inspection equipment. 【Features】 ■ Identifying defective areas by detecting heat generated at leak points with a high-sensitivity InSb camera ■ Analyzing samples in a non-destructive state, and also capable of analyzing electronic components that are difficult to analyze with OBIRCH or emission methods ■ Using the lock-in function to acquire phase information allows for high-precision identification of heat generation points *For more details, please refer to the PDF document or feel free to contact us.

• Contract Analysis

Cracks that couldn't be detected visually might be found with X-rays!

When stress such as warping, bending, or twisting is applied to the printed circuit board, cracks may occur inside the MLCC (Multi-Layer Ceramic Chip Capacitor). Additionally, cracks that occur internally are often hidden by the electrodes, making it difficult to detect them from the exterior. In such cases, how about checking with X-rays? [Observation Details] ■ Oblique CT Observation It is possible to perform CT without destroying the printed circuit board, in its original state. ■ Orthogonal CT Observation It is possible to observe the shape of the components in their original state. *For more details, please refer to the PDF document or feel free to contact us.

• Other inspection equipment and devices
• X-ray inspection equipment

On November 6th (Thursday) to 7th (Friday), 2025, we held the "Human Body Day 2025" at the NAC Image Technology Akasaka Multi-Purpose Space. We have uploaded videos of the highlights from each company and the presentations that took place on the day to our website. We encourage you to take a look. ---[Report on Human Body Day 2025 is here]------------------- https://info.nacinc.jp/jintaiday2025-report ------------------------------------------------------------------------- On the day of the event, participants were able to experience a wide range of products in a hands-on session format, including motion capture, force plates, eye tracking, and human body analysis software. We received numerous comments from attendees expressing high satisfaction, saying, "It was great to gain various information all at once," which makes us very happy. NAC Image Technology will continue to provide "valuable products to our customers." We hope you will join us for our next event as well.

The date for the "Tokai Area Electrical and Electronic WEB Technology Seminar" for the 2026 fiscal year has been decided. Registration has started, so if you are interested, please apply. Multiple participants from one company are allowed, so please make use of this opportunity to acquire basic knowledge. 【April】Basic Knowledge of Resistors 【May】Technical Course on Capacitors 【June】Basics of Motors and How to Choose the Optimal Driver 【July】Fundamentals of IC Socket and Connector Selection 【September】Basics of Magnets 【October】Failure Phenomena of Chip Resistors and Their Countermeasures 【November】Temperature Protection Design Using Thermal Fuses

NDT Mart & Rental Co., Ltd. began selling its new product, the handheld magnet "YokeLite-100V," on December 25, 2025. ◆ Handheld Magnet "YokeLite-100V" The YokeLite-100V is an AC handheld magnet (gap-type magnetizer) used for magnetic particle testing (MT). With a compact design weighing approximately 2.4 kg, it is easy to handle and allows for efficient non-destructive testing work on-site. It generates a powerful alternating magnetic field, supporting the detection of defects such as cracks in welds and on metal surfaces. It features a variable yoke structure, enabling flexible adaptation to various inspection targets, including curved surfaces, corners, and fillet welds. It ensures a lifting power of over 4.5 kg, providing sufficient magnetization capability required for magnetic particle testing. Additionally, by equipping optional UV lights or white lights, it can accommodate a wide range of inspection methods, including fluorescent magnetic particle testing and visual inspections, offering excellent cost performance. This handheld magnet is useful for defect inspection and quality control in the fields of manufacturing, plant equipment, and welding inspection. It combines lightweight design with high inspection performance, contributing to improved work efficiency.

NDT Mart & Rental Co., Ltd. began selling its new electromagnetic ultrasonic thickness gauge, 'EMAT WIFI', on January 19, 2026. ◆ Electromagnetic Ultrasonic Thickness Gauge 'EMAT WIFI' The 'EMAT WIFI' is a thickness gauge that uses the electromagnetic ultrasonic (EMAT) method, which does not require a couplant (contact medium). Unlike conventional ultrasonic thickness gauges (UT), there is no need to apply a couplant; thickness measurements can be taken simply by placing the probe on the measurement target, making it ideal for beginners and screening in large-scale sites. It can measure materials with paint, scale, thick linings, and slight surface roughness, significantly reducing the hassle of pre-treatment. Additionally, it is equipped with WiFi communication capabilities, allowing for the confirmation and management of measurement data and waveforms in conjunction with smartphones and tablets. This facilitates smooth sharing of measurement results and data management on-site. It is optimal for measuring wall thickness and conducting corrosion inspections of plant equipment, piping, tanks, and steel structures. It contributes to the efficiency and reliability of thickness measurements in the field of non-destructive testing (NDT), such as maintenance inspections and equipment diagnostics.

NDT Mart & Rental Co., Ltd. began sales of its new dual thickness gauge, the 'CT3500', on January 28, 2026. ◆ Dual Thickness Gauge 'CT3500' The 'CT3500' is a portable thickness gauge that supports a wide range of coating measurements from thin films to thick films. It employs a dual measurement method using electromagnetic and eddy current techniques, allowing for automatic differentiation between ferrous and non-ferrous substrates to measure coating thickness. The measurement range accommodates up to 3,500μm, making it suitable for measuring coatings from general painting to heavy anti-corrosion coatings and linings. With a measurement speed of approximately 0.2 seconds, it allows for efficient measurements even in inspection tasks that require multiple points. It is not only compact and easy to carry, but its display features an inclined design that is easy to see from both above and the front. Additionally, the upside-down display and background color (white/black) switching enhance visibility in dark, narrow, and outdoor environments, making it suitable for quality control within factories as well as for equipment inspections and painting checks in outdoor settings. It can be utilized for a wide range of applications, including painting management of bridges and steel structures, anti-corrosion coating measurements for pipes and tanks, and quality control in manufacturing sites. The 'CT3500' is a high-performance portable thickness gauge that provides stable measurements from thin to thick films, designed for field use.