The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side reactions.Herein,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By vi...The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side reactions.Herein,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By virtue of the in situ friction reaction between fluoropolymer grease and Li strips during rolling,a robust organic/inorganic hybrid interlayer(lithiophilic LiF/LiC_(6)framework hybridized-CF_(2)-O-CF_(2)-chains)was formed atop Li metal.The derived interface contributes to reversible Li plating/stripping behaviors by mitigating side reactions and decreasing the solvation degree at the interface.The Li@CFO||Li@CFO symmetrical cell exhibits a remarkable lifespan for 5,600 h(1.0 mA cm^(-2)and 1.0 mAh cm^(-2))and 1,350 cycles even at a harsh condition(18.0 mA cm^(-2)and 3.0 mAh cm^(-2)).When paired with high-loading LiFePO4 cathodes,the full cell lasts over 450 cycles at 1C with a high-capacity retention of 99.9%.This work provides a new friction-induced strategy for producing high-performance thin LMAs.展开更多
基金This work was supported by the National Natural Science Foundation of China(U1904216 and U22A20141)the Natural Science Foundation of Changsha City(kq2208258).
文摘The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side reactions.Herein,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By virtue of the in situ friction reaction between fluoropolymer grease and Li strips during rolling,a robust organic/inorganic hybrid interlayer(lithiophilic LiF/LiC_(6)framework hybridized-CF_(2)-O-CF_(2)-chains)was formed atop Li metal.The derived interface contributes to reversible Li plating/stripping behaviors by mitigating side reactions and decreasing the solvation degree at the interface.The Li@CFO||Li@CFO symmetrical cell exhibits a remarkable lifespan for 5,600 h(1.0 mA cm^(-2)and 1.0 mAh cm^(-2))and 1,350 cycles even at a harsh condition(18.0 mA cm^(-2)and 3.0 mAh cm^(-2)).When paired with high-loading LiFePO4 cathodes,the full cell lasts over 450 cycles at 1C with a high-capacity retention of 99.9%.This work provides a new friction-induced strategy for producing high-performance thin LMAs.
基金supported by the National Natural Science Foundation of China(U1904216,U22A20141)the Natural Science Foundation of Changsha City(kq2208258)the Natural Science Foundation of Hunan Province(2022JJ20068)。
文摘锂金属被认为是下一代高能锂电池最有前途的负极材料之一.然而,锂的不均匀沉积和巨大的体积变化严重限制了锂金属阳极的实际应用.本文采用简单的熔融法制备了无枝晶的双骨架三维复合锂负极(Li-B-Sn).Li-B-Sn复合负极独特的双骨架结构由LiB纤维相和Li22Sn5相组成,有利于锂的均匀脱除和沉积,减小了体积变化,提高了Li-B-Sn负极的性能.在对称电池中,Li-B-Sn负极在10 mA cm^(-2)的大面积容量下实现了1100h的长循环寿命.此外,高负载的LiFePO_(4)正极(~11 mg cm^(-2))和Li-B-Sn复合负极组装的全电池表现出优异的电化学性能,在2 C循环430次后,容量保持率高达92.5%.基于Li-B-Sn复合负极的Li-S软包电池循环寿命超过30圈,表现出比基于Li-B负极的Li-S软包电池更好的循环稳定性.三维骨架设计为锂金属电池的实际应用带来了新思路.
