Manganese selenide (MnSe), a conversion-type anode for Lithium-ion batteries with low cost and high specific capacity, is impeded the development by drastic volume changes and poor kinetics in Li⁺ insertion/desertion processes. In this study, we successfully synthesized uniform MnSe nanoparticles anchored in 3D carbon nanosheet matrix (MnSe ⊂ 3DCNM) via a facile sol–gel and selenation route. The obtained 3DCNM contributes high surface area, increased active sites for N-doping, excellent electric conductivity and stable nanostructure to MnSe ⊂ 3DCNM, thereby leading to full lithiation/delithiation reactions, excellent electrochemical kinetics and buffer volume expansion of MnSe nanoparticles. Among these MnSe ⊂ 3DCNM materials, MnSe ⊂ 3DCNM-1.92 exhibits superior cycle stability with a stable reversible capacity of 665.5 mA h g⁻¹ after 200 cycles and excellent rate capabilities in half cells. When combined with LiMn₂O₄ cathode, the MnSe ⊂ 3DCNM-1.92//LiMn₂O₄ full cells also exhibit excellent electrochemical properties. The kinetic analysis and EIS results demonstrate the generation of intermediate Li_xMnSe phase and the irreversible phase transformation of α-MnSe → β-MnSe with decreased diffusion energy barriers mainly facilitate MnSe ⊂ 3DCNM-1.92 to exhibit high specific capacity, superior Li⁺ and electron transport kinetics. This facile strategy provides a guideline for the other transition metal selenides with high surface areas and stable nanostructures apply in storage systems, electrocatalysis, and semiconductors.

锰硒化物（MnSe的），对于具有低成本和高比容量锂离子电池的转化型阳极，被阻止通过在李急剧的体积变化和差动力学发展⁺插入/确定过程。在这项研究中，我们成功地通过便捷的溶胶-凝胶和硒化途径合成了锚固在3D碳纳米片基质（MnSe⊂3DCNM）中的均匀MnSe纳米颗粒。所获得的3DCNM有助于MnSe N 3DCNM的高表面积，增加的N掺杂活性位点，优异的导电性和稳定的纳米结构，从而导致完全锂化/脱锂反应，出色的电化学动力学和MnSe纳米粒子的缓冲体积膨胀。在这些MnSe 3DCNM材料中，MnSe 3DCNM-1.92具有优异的循环稳定性，在200次循环后具有665.5 mA h g ^-1的稳定可逆容量，并且在半电池中具有出色的倍率性能。当与LiMn ₂ O ₄结合时阴极，MnSe 3 DCNM-1.92 // LiMn ₂ O ₄充满电池也显示出优异的电化学性能。动力学分析和EIS结果表明，中间Li _x MnSe相的产生和α-MnSe→β-MnSe的不可逆相变，具有减小的扩散能垒，主要促进了MnSe⊂3DCNM-1.92表现出高的比容量，优异的Li ⁺和Mn电子传输动力学。这种简便的策略为存储系统，电催化和半导体中的其他具有高表面积和稳定纳米结构的过渡金属硒化物提供了指南。