# MOF-Derived Carbon-Anchored Cu2Se/MnSe Heterointerfacial Nanoparticles for Enhanced Lithium Storage via Synergistic Interface Effects

## TL;DR

A new composite material for lithium-ion batteries is developed using Cu2Se/MnSe nanoparticles anchored on carbon, improving battery performance through synergistic effects.

## Contribution

A Cu2Se/MnSe@C composite is synthesized via MOF-derived methods, offering enhanced lithium storage through interface and carbon matrix synergies.

## Key findings

- The Cu2Se/MnSe@C composite shows higher specific capacity and superior rate capability compared to single-component Cu2Se@C.
- The carbon matrix and Cu2Se/MnSe interface synergistically lower charge transfer resistance and accelerate Li+ diffusion.
- Cu2Se/MnSe@C||LiFePO4 full cells demonstrate stable voltage and reliable cycling stability.

## Abstract

To address the inherent limitations of Cu2Se as a lithium-ion battery (LIB) anode, a Cu2Se/MnSe@C composite was rationally designed and synthesized via selenization of a CuMn bimetallic metal–organic framework (MOF) precursor. This synthesis strategy integrates carbon composite engineering and heterogeneous structure construction, achieving in situ formation of Cu2Se/MnSe heterogeneous nanoparticles anchored on amorphous carbon nanosheets. Structural characterizations confirm the successful construction of well-defined Cu2Se/MnSe interfaces and uniform dispersion of selenide components, with Mn introduction inducing regulated electron transfer between Cu2Se and MnSe. Electrochemical evaluations demonstrate that the Cu2Se/MnSe@C composite exhibits a significantly enhanced lithium storage performance compared to single-component Cu2Se@C, including higher specific capacity and superior rate capability. Mechanistic studies reveal that the synergistic effects of the carbon matrix (enhancing electrical conductivity and mitigating volume expansion) and the Cu2Se/MnSe heterogeneous interface (lowering charge transfer resistance, accelerating Li+ diffusion, and boosting pseudocapacitive contribution) are responsible for the performance enhancement. Moreover, Cu2Se/MnSe@C||LiFePO4 full cells deliver a stable average operating voltage and reliable cycling stability, validating the composite’s practical application potential.