Polarization in Cells Containing Single-Ion Graft Copolymer Electrolytes
Polarization in Cells Containing Single-Ion Graft Copolymer Electrolytes
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含有单离子接枝共聚物电解质的电池的极化
DOI：
10.1149/1.2191188
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发表时间：
2006
影响因子：
3.9
通讯作者：
D. Sadoway
中科院分区：
文献类型：
--
作者：
Patrick E. Trapa;A. B. Reyes;R. Gupta;A. Mayes;D. Sadoway
本文研究了BF 3掺杂的聚[（环氧乙烷）9-甲基丙烯酸锂-铁-甲基丙烯酸锂]-接枝-聚二甲基硅氧烷单离子导体。P（OEM-r-LiMA）-g-PDMS用作含有锂阳极和薄膜氧化钒阴极的电池中的电解质。循环测试揭示了一个意想不到的高极化，这导致在一个显着下降的容量相比，与传统的盐掺杂的电解质，通过添加锂盐到不带电的电解质聚（氧杂环丁烷）9甲基丙烯酸酯-接枝-聚二甲基硅氧烷生产的电池。从装有单离子电解质的氧化钒对称电池获得的阻抗谱显示与阴极/电解质界面相关的大电阻。进一步的电池测试表明，即使将膨胀锂添加到单离子电解质中，极化也保持不变。相比之下，由锂阳极、单离子电解质和合金阴极组成的电池显示出极化没有比用盐掺杂电解质构造的类似电池中发现的极化增加。这些观察结果与锂离子扩散到大块钒氧化物中可能受到单离子电解质库仑阻碍的假设一致。
The single-ion conductor, BF 3 -incorporated poly[(oxyethylene)9 methacrylate-ron-lithium methacrylate]-graft-poly(dimethyl siloxane). P(OEM-r-LiMA)-g-PDMS, was used as an electrolyte in cells containing a lithium anode and a thin-film vanadium oxide cathode. Cycle testing revealed an unanticipated high polarization which resulted in a significant drop in capacity compared to that of cells constructed with conventional salt-doped electrolytes produced by the addition of a lithium salt to an uncharged electrolyte poly(oxyethylene)9 methacrylate-graft-polydimethyl siloxane. Impedance spectra obtained from a vanadium oxide symmetric cell fitted with a single-ion electrolyte showed a large resistance associated with the cathode/electrolyte interface. Further battery testing illustrated that the polarization remained even when lithium Inflate was added to the single-ion electrolyte. In contrast, cells consisting of a lithium anode, single-ion electrolyte, and an alloying cathode showed no rise in polarization over what is found in similar cells constructed with a salt-doped electrolyte. These observations are consistent with the hypothesis that diffusion of lithium ions into the bulk vanadium oxide may be coulombically hindered by single-ion electrolytes.