To get a robust architecture for rapid and permanent ion insertion/extraction, various frameworks are constructed, attempting to enhance the high‐rate lifespan. However, uncontrollable structural evolution always results in the structural failure derived from the continuous increasing inner strain during the cycling. Herein, inspired by the nest structure, a stable framework with wave‐like surface morphology and cross‐linked inner configuration is fabricated, which possesses fast ion migration channel and stable structure. Most importantly, the concept of synchronous self‐evolution confinement is proposed for high‐capacity conversion‐type anode materials, which can control the aggregated inner strain and alleviate the inescapable electrode pulverization, thus ensuring the electrode stability and boosting the structure integrity during the repeated cycling. When serving as an anode for sodium ion batteries, the initial nest‐like (SnFe)S2 heterogeneous mildly evolves into a stable architecture with exceptional performance, expressing a prominent rate property (389.4 mA h g−1 at 30 A g−1) and stable durability (627.41 mA h g−1 at 10 A g−1 for 800 cycles). Significantly, this route of strain engineering sheds significant light on solving large volume‐expansion‐type materials for high reversible capacity, especially in the exploration of electrochemical energy storages.
High-performance conversion-reaction-based electrodes have received enormous attention due to their high theoretical capacities, yet the poor structural stability and large stress accumulation induced from volume change are identified as major limiting factors for further utilization. Although viable strategies are exerted to acquire durable storage capacity, the controllable technology of inner stress is still required to explore. Herein, the amorphous structured GeS 2 with 2D porous sheet morphology is designed for sodiumion batteries (SIBs). The differences in reaction mechanism and structure reversibility between amorphous and crystalline states are systematically investigated and unraveled. Notably, the amorphous matrix can ensure evenly distributed intermediate interface and alleviated aggregation of active materials, promoting the complete conversion reaction with decreased hysteresis. Furthermore, it provides more isotropic Na-ion diffusion channels and active sites, effectively boosting the reaction kinetics. Meanwhile, it can fully relieve the volume expansion and restrain the inner stress of GeS 2 , resulting in excellent structural tolerance. As expected, it expresses prominent rate capability and cyclic life (512.8 mA h g −1 at a superhigh rate of 10 A g −1 after 1000 cycles) for SIBs. Therefore, amorphization engineering is a reliable strategy to obtain the robust framework and unimpeded diffusion channels for developing highperformance conversion-reaction-based electrode materials.
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