A Single-Ion Conducting Borate Network Polymer as a Viable Quasi-Solid Electrolyte for Lithium Metal Batteries.,Advanced Materials

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A Single-Ion Conducting Borate Network Polymer as a Viable Quasi-Solid Electrolyte for Lithium Metal Batteries.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-27 , DOI: 10.1002/adma.201905771
Dong-Myeong Shin _{1,

2} , Jonathan E Bachman ₃ , Mercedes K Taylor _{1,

4} , Jovan Kamcev ₁ , Jesse G Park ₁ , Michael E Ziebel ₁ , Ever Velasquez ₅ , Nanette N Jarenwattananon ₁ , Gurmukh K Sethi ₆ , Yi Cui ₃ , Jeffrey R Long _{1,

4,

5}

Affiliation

Lithium-ion batteries have remained a state-of-the-art electrochemical energy storage technology for decades now, but their energy densities are limited by electrode materials and conventional liquid electrolytes can pose significant safety concerns. Lithium metal batteries featuring Li metal anodes, solid polymer electrolytes, and high-voltage cathodes represent promising candidates for next-generation devices exhibiting improved power and safety, but such solid polymer electrolytes generally do not exhibit the required excellent electrochemical properties and thermal stability in tandem. Here, an interpenetrating network polymer with weakly coordinating anion nodes that functions as a high-performing single-ion conducting electrolyte in the presence of minimal plasticizer, with a wide electrochemical stability window, a high room-temperature conductivity of 1.5 × 10-4 S cm-1 , and exceptional selectivity for Li-ion conduction (tLi+ = 0.95) is reported. Importantly, this material is also flame retardant and highly stable in contact with lithium metal. Significantly, a lithium metal battery prototype containing this quasi-solid electrolyte is shown to outperform a conventional battery featuring a polymer electrolyte.

中文翻译：

单离子导电硼酸盐网络聚合物，作为可行的锂金属电池准固体电解质。

锂离子电池几十年来一直是最先进的电化学能量存储技术，但是其能量密度受到电极材料的限制，而传统的液体电解质可能会带来重大的安全隐患。具有锂金属阳极，固体聚合物电解质和高压阴极的锂金属电池是显示出改进的功率和安全性的下一代设备的有前途的候选者，但是这种固体聚合物电解质通常不具备所需的优异的电化学性能和热稳定性。在此，互穿网络聚合物具有弱配位的阴离子节点，在增塑剂最少的情况下，作为高性能的单离子导电电解质，具有宽的电化学稳定性窗口，据报道，它具有1.5×10-4 S cm-1的高室温电导率，并且对锂离子的传导具有出色的选择性（tLi + = 0.95）。重要的是，该材料还具有阻燃性，并且与锂金属接触时具有高度稳定性。重要的是，显示出包含这种准固体电解质的锂金属电池原型要优于具有聚合物电解质的传统电池。

更新日期：2020-03-09

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