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Electric instability

2025/04/21 欄目:老域名
TAG: 本文暫時(shí)沒有添加標(biāo)簽

    As mentioned above, positive active substances will oxidize and decompose electrolytes under charging conditions, resulting in capacity loss. In addition, factors that affect the dissolution of positive materials include structural defects of positive active substances, high charging potential, and the content of carbon black in positive materials. The structural changes of electricity during the cycle of charging and discharging are important factors

    Lithium cobalt oxide is a hexagonal crystal under fully charged conditions, and a new phase monoclinic crystal is generated after the actual capacity is discharged. Lithium nickel oxide undergoes cyclic changes in LiyNiO2 within the range of 0.3 in terms of wave and rhombohedral and monoclinic crystals during the charge discharge cycle.

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    There are two different structural changes in lithium manganese oxide during the charging and discharging process:

    One is the phase transition that occurs when the stoichiometry remains constant;

    The second is the phase transition that occurs when the amount of lithium insertion and extraction changes during the charging and discharging process. When the charging voltage of LiCoO2 lithium-ion batteries exceeds 4.2V, the capacity loss is directly related to the negative detection of cobalt content, and the higher the charging cut-off current voltage, the faster the cobalt dissolution rate.

    In addition, capacity loss (or cobalt dissolution) is related to the heat treatment temperature of the synthesized active substance.

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