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Lithium-ion batteries (LIB) as one of the essential rechargeable energy storage for supporting renewable technologies is currently a big issue. It is important to understand the mechanism of lithium-ion batteries in order to improve more durable batteries, long cyclable ability and better efficiency. This work aimed to use in-situ X-ray diffraction (XRD) as a powerful technique for acquiring a fundamental understanding of structure and phase transformations of lithium-ion battery during charge mechanism. The battery consists of LiFePO4 as cathode and graphite as anode material. The results show that some new Bragg peaks occur at 2θ of 39.97° and 47.26°. These indicate a phase transformation occurred from LiFePO4 to FePO4 during the charging mechanism. It can be concluded that in-situ XRD is a powerful tool to understand the phase transformation of lithium-ion batteries during the charging mechanism.

In-situ battery measurement of LiFePO4 cathode during charge mechanism using x-ray diffraction