Page 29 - Guide to Lithium-ion Battery Solutions

Microanalysis

Observation of the shape of minute areas of battery material and measurement of conductive distribution Purpose

Evaluation of element distribution and
conductivity distribution in the same field of
Scanning Probe Microscope view

SPM-Nanoa ™
Samples
• Observation near the interface and grasp of physical properties
• Confirmation of the conductivity of minute parts Positive electrode sheet of the NCM
• Observation of minute parts and evaluation of physical (lithium nickel manganese cobalt oxide)
properties are possible the air atmosphere

Positive and negative electrodes contain active materials, conductive aids, and binders. In order to improve the
conductivity between the active materials, a conductive aid is added, and each is bound and held by a binder. Data
Evaluating how these elements are distributed in the positive electrode and how conductive paths are formed helps
improve the performance of Lithium-ion Batteries. We observed the surface shape and current distribution by measuring
the minute amount of current flowing through the conductive cantilever while applying a voltage to the positive
electrode.

Purpose Samples

Observation of surface shape and Positive electrode sheet of the NCM
measurement of potential distribution of (lithium nickel manganese cobalt oxide)
minute parts of a positive electrode

Data
Applied Voltage : -2.7V

Topography Image Current Image Current Image
(Low Contrast) (High Contrast)
Result Result

We observed the surface shape and current distribution by measuring a minute amount of current flowing through the This data compares EPMA and SPM data within the same area. EPMA evaluates the distribution of elements whereas SPM
conductive cantilever while applying a voltage to the positive electrode. From the topography image, it is not possible evaluates the distribution of shape and conductivity.
to determine where conductive aids, active materials, and binders are. However, in the current image, you can see the By analyzing the state of materials from multiple instruments, it is possible to evaluate the uneven distribution and
three areas of red, yellow-green, and blue in order of conductivity. It can be estimated that the red areas are conductive isolated state of a battery's material components, which can help with quality improvement and product development.
additives, the yellow-green areas are active materials, and the blue areas are binders.

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