Ion-regulating Hybrid Electrolyte Interface for Long-life and Low N/P Ratio Lithium Metal Batteries
Ion-regulating Hybrid Electrolyte Interface for Long-life and Low N/P Ratio Lithium Metal Batteries
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DOI：
10.1016/j.ensm.2022.05.035
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发表时间：
2022-05
影响因子：
20.4
通讯作者：
Chenfeng Ding;Yuan Liu;L. Ono;Guoqing Tong;Congyang Zhang;Jiahao Zhang;J. Lan;Yunhua Yu;
中科院分区：
文献类型：
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作者：
Chenfeng Ding;Yuan Liu;L. Ono;Guoqing Tong;Congyang Zhang;Jiahao Zhang;J. Lan;Yunhua Yu;
实用的锂金属电池(LMB)需要在固体/准固体电解液条件下充分和可逆地利用有限的金属锂阳极。这就引出了一个具有挑战性的问题，即如何创建相容的界面相来调节界面离子传输并保护活性金属。为了解决这个问题，我们报道了一种基于纤维素的复合凝胶电解质(r-CCE)，它能够通过将细菌纤维素(BC)骨架与Li6.4La3Zr1.4Ta0.6O12(LLZTO)粒子复合来稳定离子沉积。得益于纤维素的解偶联链段结构和LLZTO的额外离子通道，r-CCE不仅具有高的离子电导率(1.68T×10−3S/cm)、显著的锂离子转移数(∼0.92)和宽的电化学稳定窗口(∼5.3V)，而且有助于稳定锂阳极。采用超薄锂金属阳极(15μm)，配备r-CCE的超稳定对称Li/Li电池展示了高度稳定的电镀/剥离过程。此外，n/p比为∼0.74的全锂金属电池的面积容量达到4.2mAhcm2，循环次数达到100次，稳定性得到了改善。
Practical lithium metal batteries (LMBs) require full and reversible utilization of limited metallic Li anodes at a solid/quasi-solid electrolyte condition. This leads to a challenging issue, i.e., how to create compatible interphases to regulate interfacial ionic transport and protect the reactive metal. Herein, to address this issue, we report a robust cellulose-based composite gel electrolyte (r-CCE) capable of stabilizing ion deposition via compositing bacterial cellulose (BC) skeleton with Li6.4La3Zr1.4Ta0.6O12(LLZTO) particles. Benefiting from the decoupled segment structure of cellulose and additional ionic channels of LLZTO, r-CCE not only achieves high ionic conductivity (1.68 × 10−3S/cm) with a remarkable Li-ion transfer number (∼0.92) and a wide window of electrochemical stability (∼5.3 V), but also helps stabilize the Li anode. Utilizing ultrathin lithium metal anodes (15 μm), ultra-stable symmetric Li/Li cells that are armed with r-CCE demonstrate a highly stable plating/stripping process. Furthermore, a high areal capacity of ∼4.2 mAh/cm2, and 100 cycles with improved stability of the full Li metal batteries with n/p ratio of ∼0.74 are achieved.