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首页> 外文期刊>Advanced Functional Materials >Capacity Fading Mechanism In All Solid-state Lithium Polymer Secondary Batteries Using Peg-borate/aluminate Ester As Plasticizer For Polymer Electrolytes
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Capacity Fading Mechanism In All Solid-state Lithium Polymer Secondary Batteries Using Peg-borate/aluminate Ester As Plasticizer For Polymer Electrolytes

机译：以聚硼酸酯/铝酸酯为增塑剂的所有固态锂聚合物二次电池的容量衰减机理

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摘要

Solid-state lithium polymer secondary batteries (LPB) are fabricated with a two-electrode-type cell construction of Li solid-state polymer electrolyte (SPE) LiFePO_4. Plasticizers of polyethylene giycol) (PEG)-borate ester (B-PEG) or PEG-aiuminate ester (Al-PEG) are added intol'rthium-conductingSPEs in order to enhance their ionic conductivity, and lithium bis-trifluoromethansulfonimide (LiTFSI) is used as the lithium salt An improvement of the electrochemical properties is observed upon addition of the plasticizers at an operation temperature of 60℃. However, a decrease of discharge capacities abruptly follows after tens of stable cycles.To understand the origtn of the capacity fading, electrochemical impedance techniques, ex-situ NMR and scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS) techniques are adopted. Alternating current (AC) impedance measurements indicate that the decrease of capacity retention in the LPB is related to a severe increase of the interfacial resistance between the SPE and cathode. In addition, the bulk resistance of the SPE film is observed to accompany the capacity decay. Ex situ NMR studies combined with AC impedance measurements reveal a decrease of Li salt concentration in the SPE film after cycling. Ex situ SEM/EDS observations show an increase of concentration of anions on the electrode surface after cycling. Accordingly, the anions may decompose on the cathode surface, which leads to a reduction of the cycle life of the LPB. The present study suggests that a choice of Li salt and an increase of transference number is crucial for the realization of lithium polymer batteries.
机译：固态锂聚合物二次电池（LPB）采用Li固态聚合物电解质（SPE）LiFePO_4的两电极型电池结构制造。将聚乙烯基乙二醇（PEG）-硼酸酯（B-PEG）或PEG-铝酸酯（Al-PEG）的增塑剂添加到导电的SPE中以增强其离子电导率，而双三氟甲基磺酰亚胺锂（LiTFSI）为用作锂盐在60℃的工作温度下添加增塑剂后，电化学性能得到改善。然而，经过数十个稳定的循环后，放电容量会突然下降。要了解容量衰减的起源，电化学阻抗技术，异位NMR和扫描电子显微镜（SEM）/能量色散X射线光谱（EDS）技术被采用。交流（AC）阻抗测量表明，LPB中容量保持能力的下降与SPE和阴极之间的界面电阻的严重增加有关。另外，观察到SPE膜的体电阻伴随容量衰减。异位NMR研究与交流阻抗测量相结合，揭示了循环后SPE膜中锂盐浓度的降低。 SEM / EDS的异位观察表明，循环后电极表面上的阴离子浓度增加。因此，阴离子可能在阴极表面上分解，这导致LPB的循环寿命降低。本研究表明锂盐的选择和转移数的增加对于实现锂聚合物电池至关重要。

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