Single Lithium-Ion Conducting Solid Polymer Electrolyte with Superior Electrochemical Stability and Interfacial Compatibility for Solid-State Lithium Metal Batteries.,ACS Applied Materials & Interfaces

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Single Lithium-Ion Conducting Solid Polymer Electrolyte with Superior Electrochemical Stability and Interfacial Compatibility for Solid-State Lithium Metal Batteries.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-09 , DOI: 10.1021/acsami.9b20436
Hongyan Yuan ₁ , Jingyi Luan ₁ , Zelin Yang ₁ , Jian Zhang ₁ , Yufeng Wu ₁ , Zhouguang Lu ₂ , Hongtao Liu ₁

Affiliation

Lithium metal batteries are being explored in meeting ever-increasing energy density needs. Because of serious dendritic lithium issues in liquid-state electrolytes, it is generally thought that solid-state electrolytes are potential alternatives for lithium metal batteries. Herein, we design a new single lithium-ion conducting lithium poly[(cyano)(4-styrenesulfonyl)imide] (LiPCSI) to replace the conventional dual-ion conducting salt for use in solid polymer electrolytes (SPEs) that successfully suppress the growth of lithium dendrites. Owing to highly delocalized anion moiety and oxidation-resistant cyano group, the tailored PEO8-LiPCSI SPE exhibits extremely high Li+ transference number (0.84) as well as oxidation potential (5.53 V vs Li+/Li). The symmetric Li/PEO8-LiPCSI/Li cell runs for 1000 h at 60 °C without a short circuit. The rechargeable solid-state Li/PEO8-LiPCSI/LiFePO4 cell discharges a capacity of 141 mAh g-1 with retention over 85% during 80 cycles. These merits enable the proposed PEO8-LiPCSI SPE to be very promising for solid-state lithium metal battery applications.

中文翻译：

固态锂金属电池具有优异的电化学稳定性和界面相容性的单一锂离子导电固体聚合物电解质。

为了满足不断增长的能量密度需求，正在研究锂金属电池。由于液态电解质中严重的树枝状锂问题，通常认为固态电解质是锂金属电池的潜在替代品。本文中，我们设计了一种新型的单锂离子导电锂聚[（氰基）（4-苯乙烯磺酰基）酰亚胺]（LiPCSI），以替代用于固体聚合物电解质（SPE）的常规双离子导电盐，该盐可成功抑制生长树枝状锂。由于高度离域的阴离子部分和抗氧化的氰基，定制的PEO8-LiPCSI SPE具有极高的Li +转移数（0.84）和氧化电势（5.53 V vs. Li + / Li）。对称的Li / PEO8-LiPCSI / Li电池在60°C的温度下运行1000小时，而不会发生短路。可充电固态Li / PEO8-LiPCSI / LiFePO4电池在80个循环中的放电容量为141 mAh g-1，保留率超过85％。这些优点使提出的PEO8-LiPCSI SPE对于固态锂金属电池应用非常有前途。

更新日期：2020-02-03

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