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首页> 外文会议>International Advanced Automotive Battery Conference(AABC) and Ultracapacitor Conference; 20060517-19; Baltimore,MD(US) >Lithium-Conducting Fluoro-Ionic Melts for High Power Lithium-Ion Batteries
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Lithium-Conducting Fluoro-Ionic Melts for High Power Lithium-Ion Batteries

机译：用于大功率锂离子电池的锂导电氟离子熔体

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摘要

Commercial lithium-ion batteries use electrolytes in which both ionic species are mobile. Transport studies in the literature have shown that the primary charge carrier is the anionic moiety of the salt having a transference number of over 0.5. As charge is being carried dominantly by the anion of the lithium salt present, concentration gradients are induced within the electrochemical cell leading to concentration polarization and a premature battery failure. Our work focuses on developing novel fluorinated materials of low lattice energy and high-content of amorphous domains that allow only the mobility of the lithium ions. These materials have ionic conductivities of 10~(-2)S/cm at 120℃ and 10~(-5) S/cm at ambient temperature; such values for single-ion conducting systems have never been reported in literature. Transport experiments were performed to confirm that our system is single-ion conducting. Results have shown that no current decay similar to a discharging capacitor is observed upon applying a 0.3V within a symmetric cell (Li_4Ti_5O_(12)/ionic melt/ Li_4Ti_5O_(12)) for more than 20hrs. This indicates that the melt does not induce any gradients in the electrochemical cell and no voltage loss occurs. The poster will discuss the synthetic methods followed for preparing the novel materials, the different analytical and electrochemical techniques used to characterize them, and the battery testing results related to electrode compatibility and the charging and discharging performance over extended periods of time.
机译：商用锂离子电池使用两种离子都可移动的电解质。文献中的运输研究表明，主要的电荷载体是盐的阴离子部分，其转移数超过0.5。由于电荷主要由存在的锂盐的阴离子携带，因此会在电化学电池内引起浓度梯度，从而导致浓度极化和电池过早失效。我们的工作重点是开发新型的低晶格能量和高含量的非晶态氟化物，这些氟化物仅允许锂离子迁移。这些材料的离子电导率在120℃下为10〜（-2）S / cm，在室温下为10〜（-5）S / cm；单离子传导系统的这种值从未在文献中报道过。进行传输实验以确认我们的系统是单离子导电的。结果表明，在对称电池（Li_4Ti_5O_（12）/离子熔体/ Li_4Ti_5O_（12））中施加0.3V以上超过20小时后，没有观察到类似于放电电容器的电流衰减。这表明熔体在电化学电池中不会引起任何梯度，并且不会发生电压损失。海报将讨论制备新材料所遵循的合成方法，用于表征这些材料的不同分析和电化学技术，以及与电极相容性以及长时间内的充电和放电性能有关的电池测试结果。

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