As a promising cathode material of sodium-ion batteries, the crystallinity of Prussian blue and its analogues (PB/PBA) is extremely pivotal for the electrochemical reaction kinetics and longevity. However, the controllable modulation of the PB/PBA crystallinity still remains an intractable challenge. Herein, we propose a balanced coordination principle to prepare low-defect Prussian blue (LD-PB) materials for outstanding sodium energy storage. Sodium carboxymethylcellulose is demonstrated as a moderate chelating agent to regulate the precipitation of LD-PB with negligible trace of vacancies and crystal water molecules. The high-crystalline open framework permits superfast and highly reversible sodium insertion/extraction. Impressively, an unprecedented specific capacity of 101 mAh g⁻¹ is achieved at an ultrahigh rate of 100 C in combination with remarkable capacity retention of 97.4% over a 3000-cycling test. The present study will shed a fundamental insight into the balanced coordination strategy for advancing the PB/PBA cathode materials toward superfast and durable alkali-metal energy storage.

作为一种很有前途的钠离子电池正极材料，普鲁士蓝及其类似物（PB/PBA）的结晶度对电化学反应动力学和寿命至关重要。然而，PB/PBA 结晶度的可控调节仍然是一个棘手的挑战。在此，我们提出了一种平衡配位原则来制备低缺陷普鲁士蓝 (LD-PB) 材料，以实现出色的钠储能。羧甲基纤维素钠被证明是一种适度的螯合剂，可调节 LD-PB 的沉淀，其空位和结晶水分子的痕迹可忽略不计。高结晶开放框架允许超快和高度可逆的钠插入/提取。令人印象深刻的是，前所未有的 101 mAh g ^-1比容量以 100 C 的超高速率实现，并在 3000 次循环测试中实现了 97.4% 的显着容量保持率。本研究将为推动 PB/PBA 正极材料向超快速和耐用的碱金属储能发展的平衡协调策略提供基本的见解。