Not only is LITHIUM COBALT ACID, other common PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC in addition to iron cathode materials such as ternary, lithium iron phosphate and other half battery, also have the "first discharge capacity < first charge capacity" phenomenon, the following are three ternary and lithium iron phosphate half battery first charge and discharge curve: The first efficiency of ternary is the lowest, generally 85~88%; Lithium cobaltate followed, generally 94~96%; Lithium iron phosphate is slightly higher than lithium cobalt, 95% to 97%.
So what happened to the capacity lost in the initial charge and discharge? For the positive material semi-battery, the capacity loss is mainly caused by the material structure change after the first discharge: After the first discharge, the structure of the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC iron removal cathode material changes due to delithium, thus reducing the position of the material can be embedded lithium, lithium ions can not be embedded back to the positive electrode at the first discharge, resulting in the loss of capacity.
Like the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC half cell, the negative material half cell is affected by the first efficiency. The graphite material half battery for example, graphite material lithium ion deimpingement and embedding potential is higher, so it is a positive electrode, lithium metal sheet is a negative electrode, the first cycle, lithium ion to lose electrons from the lithium sheet (negative) after embedding graphite (positive), so the half battery first discharge, and then charge.
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