High-voltage and free-standing poly(propylene carbonate)/Li6.75La3Zr1.75Ta0.25O12 composite solid electrolyte for wide temperature range and flexible solid lithium ion battery
High-voltage and free-standing poly(propylene carbonate)/Li6.75La3Zr1.75Ta0.25O12 composite solid electrolyte for wide temperature range and flexible solid lithium ion battery
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DOI：
10.1039/c6ta10066j
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发表时间：
2017-03
影响因子：
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通讯作者：
Jian-jun Zhang;Xiaoling Zang;Huijie Wen;Tiantian Dong;J. Chai;Yang Li;Bingbing Chen;Jingwen Zhao-Jingwen
中科院分区：
文献类型：
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作者：
Jian-jun Zhang;Xiaoling Zang;Huijie Wen;Tiantian Dong;J. Chai;Yang Li;Bingbing Chen;Jingwen Zhao-Jingwen
固体电解质被认为是提高锂电池安全性和能量密度的理想方法。本文以聚碳酸亚丙酯为研究对象，制备了一种自支撑式聚碳酸亚丙酯/Li 6. 75 La 3 Zr 1. 75 Ta 0. 25 O 12复合固体电解质，用于室温和柔性固态锂电池。该复合固体电解质在20 °C下具有高的离子电导率（5.2 × 10 - 4S cm-1）、宽的电化学窗口（4.6 V）、高的离子迁移数（0.75）和令人满意的机械强度（6.8 MPa）。当作为室温固体锂电池的固体电解质进行评估时，这种复合电解质在20 °C下具有优异的倍率性能（5C）。这种上级性能可以与室温下的液体电解质浸泡的基于PP隔膜的锂电池相媲美。据我们所知，这是用于固体锂电池的固体复合电解质在环境温度下的最佳倍率性能。此外，这种基于复合电解质的柔性LiFePO 4/Li 4 Ti 5 O 12锂离子电池提供了优异的倍率性能和上级循环稳定性。所有这些迷人的特性使得聚碳酸亚丙酯/Li6.75La3Zr1.75Ta0.25O12成为一种非常有前途的用于柔性固体锂电池的全固态电解质。我们的研究在解决环境温度固体锂电池的挑战方面迈出了一大步。
Solid electrolyte is regarded as a perfect way to enhance safety issues and boost energy density of lithium batteries. Herein, we developed a type of free-standing poly(propylene carbonate)/Li6.75La3Zr1.75Ta0.25O12 composite solid electrolyte for ambient temperature and flexible solid-state lithium batteries. The composite solid electrolyte exhibited excellent comprehensive performance in terms of high ionic conductivity (5.2 × 10−4 S cm−1) at 20 °C, a wide electrochemical window (4.6 V), high ionic transference number (0.75) and satisfactory mechanical strength (6.8 MPa). When evaluated as solid electrolyte for an ambient-temperature solid lithium battery, such a composite electrolyte delivered excellent rate capability (5C) at 20 °C. This superior performance can be comparable to a liquid electrolyte-soaked PP separator-based lithium battery at room temperature. To our knowledge, this is the best rate capability of a solid composite electrolyte for a solid lithium battery at ambient temperature. Moreover, such a composite electrolyte-based flexible LiFePO4/Li4Ti5O12 lithium ion battery delivered excellent rate capability and superior cycling stability. All these fascinating features make poly(propylene carbonate)/Li6.75La3Zr1.75Ta0.25O12 a very promising all-solid-state electrolyte for flexible solid lithium batteries. Our study makes a big step into addressing the challenges of ambient-temperature solid lithium batteries.