硬碳负极为什么适合钠电池？

Why is hard carbon anode suitable for Sodium-ion Battery?    

硬碳能够成为钠电池唯一商用负极材料，核心是其微观结构完美适配钠离子的储放需求，解决了钠电池产业化的核心难题。首先，硬碳拥有大量无序分布的多级微孔、介孔结构，孔隙尺寸精准匹配大半径钠离子，能够为钠离子提供充足的嵌入存储空间，储钠容量高、利用率高；其次，硬碳结构稳定性极强，数千次充放电循环中不会发生结构坍塌、粉化，嵌脱可逆性优异，保障电池长寿命运行；最后，硬碳原材料来源广泛、制备工艺简单、生产成本低廉，适配大规模量产，同时适配三大主流正极体系，兼容性极强，能够平衡电池的性能、成本和寿命，是现阶段最优、最成熟的负极选择。

The core reason why hard carbon can become the only commercial anode material for sodium batteries is that its microstructure perfectly adapts to the sodium storage and release requirements of sodium ions, and solves the core problem of sodium battery industrialization. First of all, hard carbon has a large number of disorderly distributed multi-level micropore and mesopore structures, and the pore size is precisely matched with the large-radius sodium ions, which can provide sufficient intercalation and storage space for sodium ions, with high sodium storage capacity and high utilization rate; secondly, hard carbon has extremely strong structural stability, and will not undergo structural collapse and pulverization during thousands of charge and discharge cycles, with excellent intercalation and deintercalation reversibility, ensuring the long-life operation of the battery; finally, hard carbon has a wide range of raw material sources, simple preparation process, low production cost, and is suitable for large-scale mass production. At the same time, it is compatible with the three mainstream cathode material systems, with extremely strong adaptability, which can balance the performance, cost and life of the battery, and is the optimal and most mature anode choice at this stage.