A unique grape-cluster-like hierarchical structure in which FeS₂ is encapsulated in graphitic carbon (FeS₂@GC) composite has been elaborately designed to address the limitations in rechargeable Li-FeS₂ batteries, such as poor electronic/ionic conductivity, dissolved polysulfide intermediates, and large volume changes. In particular, the individual grape grain of FeS₂@GC particle with a yolk-shell structure that graphitic carbon shell and FeS₂ nanoparticle core can significantly enhance the electrical conductivity, buffer volume changes, and confine the generated polysulfide intermediates. Thus, these high-efficiency individuals as the reaction units can facilitate the electrochemical redox reactions, improving the reaction kinetics. In addition, the closely connected individual FeS₂@GC particles can construct a grape cluster to further enhance the electrical conductivity, facilitating ion/electron transport in the electrode. Consequently, the FeS₂@GC composite demonstrates excellent electrochemical and stable cycling performances, particularly at high C-rates. A reversible capacity of 661 mAh g⁻¹ after 200 cycles at 1 C, corresponding to a capacity retention of 97.5% of 2nd cycle (678 mAh g⁻¹), and a capacity decay rate of 0.012% per cycle are achieved. Even at a higher rate of 10 C, a high capacity retention of 407 mAh g⁻¹ after 1000 cycles is maintained, which indicates excellent cycling stability and superior rate capability.

精心设计了一种独特的葡萄簇状分层结构，其中 FeS ₂封装在石墨碳 (FeS _{2 @GC) 复合材料中，以解决可充电 Li-FeS 2}电池的局限性，例如电子/离子导电性差，溶解多硫化物中间体，体积变化大。特别地，具有蛋黄壳结构的FeS ₂ @GC 颗粒的单个葡萄颗粒由石墨碳壳和 FeS ₂纳米颗粒核可以显着增强导电性，缓冲体积变化，并限制生成的多硫化物中间体。因此，这些作为反应单元的高效个体可以促进电化学氧化还原反应，改善反应动力学。此外，紧密连接的单个FeS ₂ @GC颗粒可以构建葡萄簇，进一步增强导电性，促进电极中的离子/电子传输。因此，FeS ₂ @GC 复合材料表现出优异的电化学和稳定的循环性能，尤其是在高倍率下。^{661 mAh g −1}的可逆容量^{在 1 C 下进行 200 次循环后，对应于第 2 次循环 (678 mAh g -1} )的 97.5% 的容量保持率，以及每次循环 0.012% 的容量衰减率。即使在 10 C 的更高倍率下，在 1000 次循环后仍能保持407 mAh g ^-1的高容量保持率，这表明出色的循环稳定性和优异的倍率性能。