Effects of Nonaqueous Electrolytes on the Performance of Lithium/Air Batteries
Effects of Nonaqueous Electrolytes on the Performance of Lithium/Air Batteries
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DOI：
10.1149/1.3269928
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发表时间：
2010-02
影响因子：
3.9
通讯作者：
Wu Xu;Jie Xiao;Deyu Wang;Jian Zhang;Ji‐Guang Zhang
中科院分区：
文献类型：
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作者：
Wu Xu;Jie Xiao;Deyu Wang;Jian Zhang;Ji‐Guang Zhang
研究了非水电解质的各种性质对锂/空气电池性能的影响。锂/空气电池的性能取决于由氧气、电解质和活性炭（含催化剂）形成的三相区的数量。通过开放通道的氧扩散速率（与电解质的极性密切相关）比通过液体电解质的氧扩散速率大几个数量级;因此，与电解质的其他性质（例如氧溶解度、粘度和离子电导率）相比，电解质极性是锂/空气电池性能的最重要因素。添加到电池中的电解质的量也显著影响锂/空气电池的放电性能，并且观察到容量的明显最大值作为电解质量的函数。三（五氟苯基）硼烷作为功能性添加剂和助溶剂加入电解液中，有助于溶解电池放电过程中形成的部分Li 2 O和Li 2 O 2，有利于提高放电容量。然而，这种添加也大大降低了接触角并增加了电解质粘度，从而降低了锂/空气电池的放电容量。
The effects of various properties of nonaqueous electrolytes on the performance of lithium/air batteries are investigated. The performance of a lithium/air battery is determined by the number of triphase regions formed by oxygen, electrolyte, and active carbons (with catalyst). The oxygen diffusion rate through the open channels (strongly related to the polarity of the electrolyte) is several orders of magnitude larger than that through the liquid electrolyte; therefore, the electrolyte polarity is the most important factor on the performance of lithium/air batteries compared with other properties of the electrolyte, such as oxygen solubility, viscosity, and ionic conductivity. The quantity of the electrolyte added to a cell also significantly affects the discharge performance of the lithium/air battery, and a clear maximum in capacity is observed as a function of the electrolyte amount. The addition of tris(pentafluorophenyl)borane as a functional additive and cosolvent in electrolytes can help dissolve partial Li 2 O and Li 2 O 2 formed during the battery discharge process, which is beneficial to increasing the discharge capacity. However, this addition also largely reduces the contact angle and increases the electrolyte viscosity, thus decreasing the discharge capacity of the lithium/air battery.