Stabilizing effect of 2-(triphenylphosphoranylidene) succinic anhydride as electrolyte additive on the lithium metal of lithium metal secondary batteries
Stabilizing effect of 2-(triphenylphosphoranylidene) succinic anhydride as electrolyte additive on the lithium metal of lithium metal secondary batteries
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DOI：
10.1016/j.electacta.2015.04.168
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发表时间：
2015-07
影响因子：
6.6
通讯作者：
Jiseon Jeong;Je-Nam Lee;Jung-Ki Park;Myung-Hyun Ryou;Y. Lee
中科院分区：
文献类型：
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作者：
Jiseon Jeong;Je-Nam Lee;Jung-Ki Park;Myung-Hyun Ryou;Y. Lee
我们引入 2-(三苯基亚正膦) 琥珀酸酐 (TPSA) 作为锂 (Li) 金属阳极表面稳定电解质添加剂，用于改善锂金属二次电池的循环性能。我们验证了TPSA在液体电解质分解之前很容易在锂金属负极上分解，并形成稳定的表面层，即固体电解质界面（SEI）。因此，TPSA被发现可以改善由LiCoO2/Li金属组成的单元电池的循环性能。含有 3 wt.% TPSA 的单元电池在 100 次循环后保留了 85% 的初始放电容量，而不含 TPSA 的单元电池仅在 50 次循环后就表现出灾难性的故障。每个单元电池均在 3.0–4.2 V vs. Li/Li+ 的电压范围内以 C/2 速率 (0.8 mA cm−2) 运行。 TPSA 衍生的 SEI 可抑制电解质的连续分解，从而抑制锂枝晶的形成。 TPSA 的效果通过扫描电子显微镜、电化学阻抗谱和 X 射线光电子能谱进行了表征。
We introduce 2-(triphenylphosphoranylidene) succinic anhydride (TPSA) as a lithium (Li) metal anode surface-stabilizing electrolyte additive for improving the cycle performance of Li metal secondary batteries. We verified that TPSA is readily decomposed on Li metal anodes before the decomposition of liquid electrolytes, and forms stable surface layers, i.e., a solid electrolyte interface (SEI). Consequently, TPSA was found to improve the cycle performance of unit cells consisting of LiCoO2/Li metal. The unit cells containing 3 wt.% of TPSA retain 85% of the initial discharge capacity after 100 cycles, whereas the unit cells that do not contain TPSA showed catastrophic failure after only 50 cycles. Each unit cell was operated at C/2 rate (0.8 mA cm−2) in the voltage range 3.0–4.2 V vs. Li/Li+. The TPSA-derived SEI suppresses continuous electrolyte decomposition, and thereby Li dendrite formation as well. The effect of TPSA was characterized by scanning electron microscopy, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy.