什么是钠电池的嵌脱可逆性？

What is the intercalation and deintercalation reversibility of Sodium-ion Battery?    

嵌脱可逆性是钠离子电池能够长期循环使用的核心底层原理，也是衡量电池品质优劣的关键技术指标。它指钠离子在电池充放电循环中，可以反复、稳定、无损地从正负极材料晶格中嵌入和脱出，每一次循环后，电极材料的晶体结构、孔隙结构都能基本恢复至初始状态，不会发生永久性坍塌、变形、粉化和失效。具备优异嵌脱可逆性的电池，充放电副反应少、容量衰减缓慢、循环次数多；若可逆性差，多次循环后电极结构会持续损坏，电池容量快速跳水、寿命大幅缩短。商用成熟钠电池的嵌脱可逆性极强，足以支撑数千次稳定循环。

Intercalation and deintercalation reversibility is the core underlying principle that enables Sodium-ion Battery to be recycled for a long time, and also a key technical indicator to measure the quality of the battery. It refers to that during the charge and discharge cycle of the battery, sodium ions can be repeatedly, stably and non-destructively intercalated into and deintercalated from the lattice of the cathode and anode materials, and the crystal structure and pore structure of the electrode materials can be basically restored to the initial state after each cycle without permanent collapse, deformation, pulverization and failure. Batteries with excellent intercalation and deintercalation reversibility have few side reactions during charge and discharge, slow capacity attenuation and many cycle times; if the reversibility is poor, the electrode structure will be continuously damaged after multiple cycles, the battery capacity will drop rapidly, and the service life will be greatly shortened. Commercial mature sodium batteries have extremely strong intercalation and deintercalation reversibility, which can support thousands of stable cycles.