MXene-Derived Na+-Pillared Vanadate Cathodes for Dendrite-Free Potassium Metal Batteries,Small

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MXene-Derived Na+-Pillared Vanadate Cathodes for Dendrite-Free Potassium Metal Batteries
Small ( IF 13.0 ) Pub Date : 2023-09-27 , DOI: 10.1002/smll.202306572
Hongyan Yang ₁ , Qi Li ₂ , Lanju Sun ₁ , Shengliang Zhai ₁ , Xiaokang Chen ₁ , Yi Tan ₁ , Xiao Wang ₁ , Chengcheng Liu ₁ , Wei-Qiao Deng ₁ , Hao Wu _{1,

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Affiliation

Cation-intercalated vanadates, which have considerable promise as the cathode for high-performance potassium metal batteries (PMBs), suffer from structural collapse upon K⁺ insertion and desertion. Exotic cations in the vanadate cathode may ease the collapse, yet their effect on the intrinsic cation remains speculative. Herein, a stable and dendrite-free PMB, composed of a Na⁺ and K⁺ co-intercalated vanadate (NKVO) cathode and a liquid NaK alloy anode, is presented. A series of NKVO with tuneable Na/K ratios are facilely prepared using MXene precursors, in which Na⁺ is testified to be immobilized upon cycling, functioning as a structural pillar. Due to stronger ionic bonding and lower Fermi level of Na⁺ compared to K⁺, moderate Na⁺ intercalation could reduce K⁺ binding to the solvation sheath and favor K⁺ diffusion kinetics. As a result, the MXene-derived Na⁺-pillared NKVO exhibits markedly improved specific capacities, rate performance, and cycle stability than the Na⁺-free counterpart. Moreover, thermally-treated carbon paper, which imitates the microscopic structure of Chinese Xuan paper, allows high surface tension liquid NaK alloy to adhere readily, enabling dendrite-free metal anodes. By clarifying the role of foreign intercalating cations, this study may lead to a more rational design of stable and high-performance electrode materials.

更新日期：2023-09-29

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