title: Synthesis of MXene/Ag Composites for Extraordinary Long Cycle Lifetime Lithium Storage at High Rates.
abstract: A new MXene/Ag composite was synthesized by direct reduction of a AgNO3 aqueous solution in the presence of MXene (Ti3C2(OH)0.8F1.2). The as-received MXene/Ag composite can be deemed as an excellent anode material for lithium-ion batteries, exhibiting an extraordinary long cycle lifetime with a large capacity at high charge-discharge rates. The results show that Ag self-reduction in MXene solution is related to the existence of low-valence Ti. Reversible capacities of 310 mAh·g(-1) at 1 C (theoretical value being ∼320 mAh·g(-1)), 260 mAh·g(-1) at 10 C, and 150 mAh·g(-1) at 50 C were achieved. Remarkably, the composite withstands more than 5000 cycles without capacity decay at 1-50 C. The main reasons for the long cycle life with high capacity are relevant to the reduced interface resistance and the occurrence of Ti(II) to Ti(III) during the cycle process.
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
authors: Guodong
authors: G
authors: Zou
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
authors: Zhiwei
authors: Z
authors: Zhang
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
authors: Jianxin
authors: J
authors: Guo
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.|School of Materials Science and Engineering, Henan Polytechnic University , Jiaozuo 454000, P.R. China.
authors: Baozhong
authors: B
authors: Liu
authors: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao 066004, P.R. China.
authors: Qingrui
authors: Q
authors: Zhang
authors: School of Pharmacy and Life Sciences, Robert Gordon University , Aberdeen AB107GJ, United Kingdom.
authors: Carlos
authors: C
authors: Fernandez
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
authors: Qiuming
authors: Q
authors: Peng
keywords: MXene; composite; lithium batteries; self-reduction