Page 27 - Guide to Lithium-ion Battery Solutions

Microanalysis

Observation of minute parts of the positive electrode, elemental analysis and chemical bond state analysis Purpose Samples

Evaluate the chemical bonding state of the Comparison of initial state and charged state
active material of a positive electrode
Electron Probe Microanalyzer

EPMA -8050G
™
• Both high sensitivity and high spatial resolution are Data
achieved due to excellent electron probe characteristics
• Chemical bond state analysis of minute parts is possible
• Wide area mapping by stage scan Initilal State Charged State

A positive electrode has a structure in which a mixture of the active material, binder, and conductive additive are coated
on a collector made of aluminum foil. Evaluation of the distribution of these components is important to improve cell
performance and quality control, and when conducting failure analysis.

Purpose Samples

Observation and elemental analysis of minute Positive electrode active material
parts of a positive electrode's cross section

Data

State analysis of the positive electrode surface Spectrum of Mn on Positive Electrode Surface and
Enlarged View of Peak Tops
Samples were provided by the National Institute of Advanced Industrial Science and Technology

Result
Element mapping analysis of the cross section of a positive electrode
Samples were provided by the National Institute of Advanced Industrial Science and Technology
The difference shown in the spectrum is due to a peak shift between the initial state and the charged state. EPMA can
Result detect changes in the state of chemical bonds aimed at small parts.

Above data is the result of a mapping analysis of the positive electrode cross section. Not only coarse particles with sizes of several
μm, but also fine particles with sizes of less than 1 μm, the condition of boundaries and the element distribution can be observed.

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