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    • 4. 发明授权
    • Forming multilayered solid electrolyte interphase structures on high capacity electrodes
    • 在高容量电极上形成多层固体电解质相间结构
    • US09112212B1
    • 2015-08-18
    • US13281252
    • 2011-10-25
    • Rainer J FaschingGregory Alan RobertsYi CuiSong Han
    • Rainer J FaschingGregory Alan RobertsYi CuiSong Han
    • H01M4/134H01M4/02
    • H01M4/134H01M4/02H01M4/366H01M2004/021
    • Provided are novel methods of fabricating electrochemical cells containing high capacity active materials that form multilayered solid electrolyte interphase (SEI) structures on the active material surface during cell fabrication. Combining multiple different SEI layers on one surface can substantially improve cell performance by providing each layer with different properties. For example, an outer layer having a high electronic resistance may be combined with an inner layer having a high ionic permeability. To form such multilayered SEI structures, formation may involve changing electrolyte composition, functionalizing surfaces, and/or varying formation conditions. For example, formation may start with a boron containing electrolyte. This initial electrolyte is then replaced with an electrolyte that does not contain boron and instead may contain fluorine additives. In certain embodiments, cell's temperature is changed during formation to initiate different chemical reactions during SEI formation. Variations in multilayered SEI structures may be also achieved by varying current rates.
    • 提供了在电池制造期间在活性材料表面上形成含有高容量活性材料的电化学电池的新颖方法,其在活性材料表面上形成多层固体电解质间相(SEI)结构。 在一个表面上组合多个不同的SEI层可以通过提供每个层具有不同的性质来显着改善电池的性能。 例如,具有高电子电阻的外层可以与具有高离子渗透性的内层组合。 为了形成这种多层SEI结构,形成可能涉及改变电解质组成,官能化表面和/或变化的形成条件。 例如,可以用含硼电解质开始形成。 然后用不含硼的电解质替代该初始电解质,并且可以含有氟添加剂。 在某些实施方案中,细胞的温度在形成过程中改变,以在SEI形成过程中引发不同的化学反应。 多层SEI结构的变化也可以通过改变当前速率来实现。