Method for detecting phase purity of lithium titanate composition

Abstract

The invention provides a method for detecting the phase purity of a lithium titanate composition. The method comprises the following steps: preparing mixtures with different ratios of lithium titanate to each impurity phase substance; adopting XRD characterization, according to a phase quantitative analysis external standard method, calculating the linear equation of diffraction peak strength ratio of the impurity phase substance and lithium titanate to mass percentage of the impurity phase substance; adopting XRD to characterize lithium titanium powder to be detected so as to obtain the diffraction peak strength ratio of the impurity phase substance to be detected in lithium titanium powder and lithium titanium to be detected; according to the calculated linear equation, and individually subjecting the diffraction peak strength ratios of corresponding impurity phase substance and lithium titanium to a calculation treatment to obtain the purity of lithium titanium in the lithium titanium powder. The provided method can rapidly and accurately calculate the purity of lithium titanate in a lithium titanium composition sample. The detection precision and detection efficiency are both improve. Moreover, the precise detection results can be used to evaluate the electrochemical performance of a lithium ion battery, and the evaluation results become more accurate.

Description

technical field [0001] The invention relates to the technical field of phase purity detection, in particular to a detection method for phase purity of a lithium titanate composite. Background technique [0002] Lithium-titanium composite oxide lithium titanate has a spinel structure and is a new lithium-ion battery anode material used in the field of power batteries and energy storage. During the charging and discharging process of lithium-ion batteries, lithium ions are intercalated and extracted, and the crystal structure of lithium titanate material hardly changes. Therefore, lithium-ion batteries have excellent characteristics such as long cycle life, fast charging speed, and high safety. [0003] In the process of synthesizing lithium titanate by high-temperature solid-phase method, metastable titanium dioxide with high reactivity is generally used as titanium source. The common forms of titanium dioxide are rutile and anatase, so the synthesis of lithium titanate will ...

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Problems solved by technology

[0005] The inventor found in the research that the detection method for qualitatively analyzing the purity of lithium titanate in the sample to be tested in the prior art can only roughly measure the range of the purity of lithium titanate in the sample to be tested, and the accuracy of the measured results is Poor, and using the results of poor precision to evaluate the electrochemical performance of lithium-ion batteries also makes the accuracy of the evaluation results poor

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