当前位置：
X-MOL 学术
›
Batteries Supercaps
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Layered MXene Protected Lithium Metal Anode as an Efficient Polysulfide Blocker for Lithium‐Sulfur Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-04-27 , DOI: 10.1002/batt.202000062 Wantang Li 1 , Yifang Zhang 1 , Huan Li 1 , Zijin Chen 2 , Tongxin Shang 1 , Zhitan Wu 1 , Chen Zhang 3 , Jia Li 2 , Wei Lv 2 , Ying Tao 1 , Quan‐Hong Yang 1
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-04-27 , DOI: 10.1002/batt.202000062 Wantang Li 1 , Yifang Zhang 1 , Huan Li 1 , Zijin Chen 2 , Tongxin Shang 1 , Zhitan Wu 1 , Chen Zhang 3 , Jia Li 2 , Wei Lv 2 , Ying Tao 1 , Quan‐Hong Yang 1
Affiliation
|
The shuttle effect of lithium polysulfides (LiPSs) from sulfur cathode to lithium (Li) anode is one of the main obstacles for lithium‐sulfur (Li−S) batteries. The severe corrosion of Li metal anode by the dissolved LiPSs bottlenecks the efficient operation of Li−S batteries, however, the anode part has not been received much attention compared to those extensive efforts related to the cathode designs. Herein, we show that the interface between Ti3C2Tx (T=−OH, −F)‐based MXene and reduced graphene oxide (rGO) is able to guide uniform Li nucleation, promoting highly reversible and dendrite‐free Li plating/stripping. Such the Li anode demonstrates excellent cycling stability for more than 1000 hours even under ultra‐high rate (10 mA cm−2) and high areal capacity (3 mAh cm−2). More importantly, the well‐designed 2D layered structure by coupling the Ti3C2Tx with a graphene scaffold, is highly efficient to block the shuttled polysulfides and inhibit the corrosion of the lithium metal anode. As a result, the Li−S full battery exhibits a stable cycling stability with a high Coulombic efficiency of 99.8 % over 300 cycles. This work suggests the design strategy of Li metal anode especially targeting at the sulfur cathode, and we hope it can provide valuable inspirations for the future design of Li metal anodes for more practical Li−S batteries.
中文翻译：
层状MXene保护的锂金属阳极可作为锂硫电池的高效多硫化物阻滞剂
多硫化锂（LiPSs）从硫阴极到锂（Li）阳极的穿梭效应是锂硫（Li-S）电池的主要障碍之一。溶解的LiPS严重腐蚀了锂金属阳极，这阻碍了Li-S电池的有效运行，但是，与那些与阴极设计相关的广泛工作相比，阳极部件并未受到太多关注。本文表明，基于Ti 3 C 2 T x（T = -OH，-F）的MXene和还原氧化石墨烯（rGO）之间的界面能够引导均匀的Li成核，促进高度可逆且无枝晶的Li镀层/ stripping。这种Li阳极即使在超高倍率（10 mA cm -2）下也表现出超过1000小时的出色循环稳定性）和高面容量（3 mAh cm -2）。更重要的是，经过精心设计的2D层状结构（通过将Ti 3 C 2 T x与石墨烯支架偶联）可以非常有效地阻止穿梭的多硫化物并抑制锂金属阳极的腐蚀。结果，Li-S满电池在300次循环中表现出稳定的循环稳定性和99.8％的高库仑效率。这项工作提出了锂金属阳极的设计策略，尤其是针对硫阴极的设计策略，我们希望它可以为将来用于更实用的Li-S电池的锂金属阳极的设计提供有价值的灵感。
更新日期：2020-04-27
中文翻译：
层状MXene保护的锂金属阳极可作为锂硫电池的高效多硫化物阻滞剂
多硫化锂（LiPSs）从硫阴极到锂（Li）阳极的穿梭效应是锂硫（Li-S）电池的主要障碍之一。溶解的LiPS严重腐蚀了锂金属阳极，这阻碍了Li-S电池的有效运行，但是，与那些与阴极设计相关的广泛工作相比，阳极部件并未受到太多关注。本文表明，基于Ti 3 C 2 T x（T = -OH，-F）的MXene和还原氧化石墨烯（rGO）之间的界面能够引导均匀的Li成核，促进高度可逆且无枝晶的Li镀层/ stripping。这种Li阳极即使在超高倍率（10 mA cm -2）下也表现出超过1000小时的出色循环稳定性）和高面容量（3 mAh cm -2）。更重要的是，经过精心设计的2D层状结构（通过将Ti 3 C 2 T x与石墨烯支架偶联）可以非常有效地阻止穿梭的多硫化物并抑制锂金属阳极的腐蚀。结果，Li-S满电池在300次循环中表现出稳定的循环稳定性和99.8％的高库仑效率。这项工作提出了锂金属阳极的设计策略，尤其是针对硫阴极的设计策略，我们希望它可以为将来用于更实用的Li-S电池的锂金属阳极的设计提供有价值的灵感。
京公网安备 11010802027423号