Correlating Electrode–Electrolyte Interface and Battery Performance in Hybrid Solid Polymer Electrolyte‐Based Lithium Metal Batteries
Correlating Electrode–Electrolyte Interface and Battery Performance in Hybrid Solid Polymer Electrolyte‐Based Lithium Metal Batteries
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DOI：
10.1002/aenm.201701231
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发表时间：
2017-11
影响因子：
27.8
通讯作者：
Q. Pan;Dmitri Barbash;Derrick M. Smith;Hao Qi;Sarah E. Gleeson;Christopher Y. Li
中科院分区：
文献类型：
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作者：
Q. Pan;Dmitri Barbash;Derrick M. Smith;Hao Qi;Sarah E. Gleeson;Christopher Y. Li
固体聚合物电解质（spe）是锂金属电池（lmb）所需要的，因为它们不易燃，并且具有优异的抗锂枝晶生长能力。然而，由于电池系统的复杂性，制造高性能聚合物lmb仍然是一个巨大的挑战。在这项工作中，使用一系列定制设计的混合spe来制备具有LiFePO4基阴极的lmb。在60°C和90°C下获得了具有优异速率能力和长循环寿命的高性能lmb。这一系列混合SPE的良好控制网络结构为研究SPE性质与LMB性能之间的关系提供了一个模型系统。结果表明，聚合物LMB的循环寿命与SPE-Li界面离子电导率密切相关，强调了固体电解质界面在LMB运行中的重要性。LMB性能进一步与分子网络结构相关。预计这项研究的结果将有助于为高性能LMB应用程序设计spe。
Solid polymer electrolytes (SPEs) are desirable in lithium metal batteries (LMBs) since they are nonflammable and show excellent lithium dendrite growth resistance. However, fabricating high performance polymer LMBs is still a grand challenge because of the complex battery system. In this work, a series of tailor‐designed hybrid SPEs are used to prepare LMBs with a LiFePO4‐based cathode. High performance LMBs with both excellent rate capability and long cycle life are obtained at 60 and 90 °C. The well‐controlled network structure in this series of hybrid SPEs offers a model system to study the relationship between the SPE properties and the LMB performance. It is shown that the cycle life of the polymer LMBs is closely correlated with the SPE–Li interface ionic conductivity, underscoring the importance of the solid electrolyte interface in LMB operation. LMB performance is further correlated with the molecular network structure. It is anticipated that results from this study will shed light on designing SPEs for high performance LMB applications.