POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE
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United States of America Patent
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Issued Date -
Aug 8, 2024
app pub date -
Mar 18, 2024
filing date -
Nov 28, 2019
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Abstract
A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.
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