Constructing high-energy–density and low-cost batteries is the ultimate pursuit of energy market. However, fast kinetics becomes a critical bottleneck, when the volume and weight parameters to be constantly optimized. Herein, sheet-like SnS/SnS₂/rGO heterostructure is designed rationally for kinetics challenges of compact energy storage under high mass loading. Abundant heterogeneous grain boundaries and ideal buffer space are provided by in-situ growth of heterostructures, achieving fast conductivity and structural stability. As anode for sodium ion battery, mass loading of ~3 mg cm⁻² SnS/SnS₂/rGO exhibit rapid rate capability (460.9 mAh g⁻¹ at 2.0 A g⁻¹) and excellent cycling stability (81% capacity retention for 500 cycles at 1.0 A g⁻¹). The assembled full cell demonstrates a promising energy density of 130.3 Wh kg⁻¹. Importantly, first-principles calculations unravel that interior electric-field induced by heterojunction of phase interfaces can accelerate the charge transfer. Additionally, the anode can also demonstrate good electrochemical performance in potassium-ion batteries. This work provides a new perspective to realize rational structural engineering for high-energy–density devices.

构建高能量密度、低成本的电池是能源市场的终极追求。然而，当体积和重量参数需要不断优化时，快速动力学成为一个关键的瓶颈。在此，片状 SnS/SnS ₂ /rGO 异质结构被合理设计，以应对高质量负载下紧凑型储能的动力学挑战。异质结构的原位生长提供了丰富的异质晶界和理想的缓冲空间，实现了快速的导电性和结构稳定性。作为钠离子电池的阳极，~3 mg cm ^-2 SnS/SnS ₂ /rGO 的质量负载表现出快速倍率能力（460.9 mAh g ^-1 at 2.0 A g ^-1) 和出色的循环稳定性（1.0 A g ^{-1 下}500 次循环的容量保持率为 81% ）。组装的全电池表现出130.3 Wh kg ^-1的有前途的能量密度。重要的是，第一性原理计算揭示了由相界面异质结引起的内部电场可以加速电荷转移。此外，阳极还可以在钾离子电池中表现出良好的电化学性能。这项工作为实现高能量密度器件的合理结构工程提供了新的视角。