Formation of the graphite/electrolyte interface by lithium bis(oxalato)borate
Formation of the graphite/electrolyte interface by lithium bis(oxalato)borate
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DOI：
10.1149/1.1568173
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发表时间：
2003-06
影响因子：
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通讯作者：
K. Xu;Shengshui Zhang;T. Jow
中科院分区：
文献类型：
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作者：
K. Xu;Shengshui Zhang;T. Jow
用电化学方法研究了含二硼酸锂（LiBOB）电解液中石墨阳极上形成的固体电解质界面（SEI），发现LiBOB在石墨阳极上的不可逆还原过程约为100 ℃。1.6 V对Li为了确定该过程是否是在稳定石墨烯结构对抗碳酸丙烯酯（PC）方面的独特LiBOB性质的原因，我们在一系列电势下系统地中断LiBOB电解质中石墨阳极的锂化，然后测试这些预成型阳极在LiPF 6的PC溶液中的存活性，LiPF 6是已知容易剥离石墨材料的电解质组合物。结果表明，功能性SEI的形成在相对于Li约0.50 V的电势下完成，并且证实了BOB-阴离子在所形成的SEI保护石墨烯结构免于剥离的有效性中起关键作用，即使在PC中。
Solid electrolyte interface (SEI) formed on graphitic anode in electrolyte containing a salt, lithium bis(oxalato)borate (LiBOB), was investigated using electrochemical means, and an irreversible reduction process was found for LiBOB on graphitic anode at ca. 1.6 V vs. Li. To ascertain whether this process is responsible for the unique LiBOB property in stabilizing graphene structure against propylene carbonate (PC), we systematically interrupted the lithiation of graphitic anodes in LiBOB-electrolytes at a series of potentials and then tested the survivability of these preformed anodes in PC solution of LiPF 6 , an electrolyte composition known to exfoliate graphite materials readily. The results demonstrate that the formation of a functioning SEI is completed at potentials around 0.50 V vs. Li, and confirmed that BOB-anion plays a critical role in the effectiveness of the formed SEI to protect the graphene structure from exfoliation even in PC.