Graphite has been commercialized as a material of lithium ions batteries because of its abundant source, low cost and excellent conductivity while the small interlayer spacing of graphite limits its application for Na⁺ insertion/extraction. Herein, an emerging and effective approach—chain-like H₂N(CH₂)_xNH₂ locked between graphene oxide (GO) sheets to expand the interlayer spacing of graphene with enhanced stability of layered structure was demonstrated by a dehydration condensation reaction. The as-obtained H₂N(CH₂)_xNH₂, which can link GO (xDM-GO), exhibits a lock-link structure, resulting in expanded interlayer spacing, with which the excellent Na⁺ storage performance with a high specific discharge capacity of 158.1 mAh g⁻¹ at 0.1 A g⁻¹ and outstanding capacity retention of 82.2% at a current density of 1 A g⁻¹ can be achieved. The effects of interlayer spacing on Na⁺ diffusion coefficient and the rate capability were investigated, for which 0.95 nm is the most suitable interlayer spacing for the Na⁺ insertion/extraction. The novel strategy demonstrates an effective way to controllably tune the interlayer spacing with the improved structure stability of GO, resulting in the best Na⁺ insertion/extraction behavior with the excellent Na⁺ storage performance.

石墨由于其丰富的来源，低成本和出色的导电性而被商业化为锂离子电池的材料，而石墨的小层间距限制了其在Na ⁺插入/萃取中的应用。在本文中，通过脱水缩合反应证明了一种新兴且有效的方法-锁定在氧化石墨烯（GO）片之间的链状H ₂ N（CH ₂）_x NH ₂，以扩大石墨烯的层间距，从而增强了层状结构的稳定性。所获得的H ₂ N（CH ₂）_x NH ₂，其可以链接GO（XDM-GO），显示出锁定连杆结构，从而导致层间间隔，通过该优异的Na膨胀⁺存储性能与158.1毫安g的高比放电容量^-1在0.1 A克^-1在1 A g ^-1的电流密度下，可实现82.2％的出色容量保持率。研究了层间距对Na ⁺扩散系数和速率能力的影响，其中0.95 nm是最适合Na ⁺插入/提取的层间距。该新策略展示了一种可控地调节层间距的有效方法，可改善GO的结构稳定性，从而获得最佳的Na ⁺具有出色的Na ⁺存储性能的插入/提取行为。