A general process is developed to prepare binding nanosized cobalt chalcogenides in B,N‐codoped graphene (CoSe₂/BNG and CoS₂/BNG). When used as anodes for sodium‐ion batteries, the CoSe₂/BNG and CoS₂/BNG deliver excellent sodium‐storage performance. The CoSe₂/BNG displays a reversible capacity of 270 mAh g⁻¹ after 2000 cycles at a current density of 1 A g⁻¹. Even at 20 A g⁻¹, it can still give a capacity of 187 mAh g⁻¹. Moreover, the CoS₂/BNG shows 387 mAh g⁻¹ at 10 A g⁻¹, demonstrating its superior high rate performance. The enhanced sodium‐storage properties of the CoSe₂/BNG and CoS₂/BNG nanocomposites may be attributed to the high conductive graphene network, enhanced sodium storage of B,N‐codoping in graphene, and the small CoSe₂ and CoS₂ nanocrystallites that shorten the electronic and ionic diffusion length throughout the electrode.

中文翻译：

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在B，N-掺杂的石墨烯中结合纳米级钴硫属元素化物以增强钠存储

开发了一种通用的方法来制备在B，N掺杂的石墨烯（CoSe ₂ / BNG和CoS ₂ / BNG）中的结合纳米级硫属元素化物。当用作钠离子电池的阳极时，CoSe ₂ / BNG和CoS ₂ / BNG具有出色的钠存储性能。CoSe ₂ / BNG在1 A g ^-1的电流密度下经过2000次循环后显示出270 mAh g ^-1的可逆容量。即使在20 A g ^-1时，它仍然可以提供187 mAh g ^-1的容量。此外，服务等级₂ / BNG节目387毫安克^-1以10 A G ^-1，证明了其卓越的高速率性能。CoSe ₂ / BNG和CoS ₂ / BNG纳米复合材料钠存储特性的增强可能归因于高导电石墨烯网络，石墨烯中B，N掺杂的钠存储增强以及小的CoSe ₂和CoS ₂纳米微晶。缩短整个电极的电子和离子扩散长度。