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Interfacial Plasticization Strategy Enabling a Long-Cycle-Life Solid-State Lithium Metal Battery
Small ( IF 13.0 ) Pub Date : 2023-11-22 , DOI: 10.1002/smll.202304234
Zhihao Zhang 1 , Ming Zhang 1 , Jintian Wu 1 , Xin Hu 1 , Bowen Fu 1 , Xingwei Zhang 1 , Bin Luo 1 , Kashif Khan 1 , Zixuan Fang 1 , Ziqiang Xu 1, 2 , Mengqiang Wu 1, 2
Affiliation  

The limited ionic conductivity and unstable interface due to poor solid–solid interface pose significant challenges to the stable cycling of solid-state batteries (SSBs). Herein, an interfacial plasticization strategy is proposed by introducing a succinonitrile (SN)-based plastic curing agent into the polyacrylonitrile (PAN)-based composite polymer electrolytes (CPE) interface. The SN at the interface strongly plasticizes the PAN in the CPE, which reduces the crystallinity of the PAN drastically and enables the CPE to obtain a low modulus surface, but it still maintains a high modulus internally. The reduced crystallinity of PAN provides more amorphous regions, which are favorable for Li+ transport. The gradient modulus structure not only ensures intimate interfacial contact but also favors the suppression of Li dendrites growth. Consequently, the interfacial plasticized CPE (SF-CPE) obtains a high ionic conductivity of 4.8 × 10−4 S cm−1 as well as a high Li+ transference number of 0.61. The Li–Li symmetric cell with SF-CPE can cycle for 1000 h at 0.1 mA cm−2, the LiFeO4 (LFP)-Li full-cell demonstrates a high capacity retention of 86.1% after 1000 cycles at 1 C, and the LiCoO2 (LCO)-Li system also exhibits an excellent cycling performance. This work provides a novel strategy for long-life solid-state batteries.

中文翻译:


界面塑化策略实现长循环寿命固态锂金属电池



由于固-固界面较差,有限的离子电导率和不稳定的界面对固态电池(SSB)的稳定循环提出了重大挑战。在此,提出了一种界面塑化策略,将丁二腈(SN)基塑料固化剂引入到聚丙烯腈(PAN)基复合聚合物电解质(CPE)界面中。界面处的SN对CPE中的PAN产生强烈塑化作用,使PAN的结晶度大幅降低,使CPE获得低模量的表面,但内部仍保持高模量。 PAN的结晶度降低提供了更多的无定形区域,这有利于Li +传输。梯度模量结构不仅保证了紧密的界面接触,而且有利于抑制锂枝晶的生长。因此,界面增塑CPE(SF-CPE)获得了4.8×10 -4 S cm -1的高离子电导率以及0.61的高Li +迁移数。具有SF-CPE的Li-Li对称电池可以在0.1 mA cm -2下循环1000小时,LiFeO 4 (LFP)-Li全电池在1 C下循环1000次后显示出86.1%的高容量保持率,并且LiCoO 2 (LCO)-Li体系还表现出优异的循环性能。这项工作为长寿命固态电池提供了一种新颖的策略。
更新日期:2023-11-22
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