聚阴离子型钠离子电池正极材料的研究进展

潘雯丽,关文浩,姜银珠

Research Advances in Polyanion-Type Cathodes for Sodium-Ion Batteries

Wenli Pan,Wenhao Guan,Yinzhu Jiang

表1 不同聚阴离子钠电正极材料的结构及离子扩散系数

Table 1 Structures and sodium ion diffusion coefficients of polyanion cathodes for sodium ion batteries.

Chemical formula Space group Dimensions of ion channels Sodium diffusion coefficient/(cm2·s?1) Ref. Phosphates Maricite-NaFePO4 Pnma none 4.79 × 10?11 (nano amorphous particles) 20 Olivine-NaFePO4 Pnma one 8.63 × 10?17 18 Na2FeP2O7 P${\rm{\bar 1}}$ three (2.79–8.45) × 10?13 57 Na2CoP2O7 P${\rm{\bar 1}}$ three / 23 P21cn two / 23 P42/mnm three / 23 Na3V2(PO4)3 R${\rm{\bar 3}}$cH three 4.59 × 10?13–2.45 × 10?10 58 Na3V2(PO4)2F3 P42/mnm three 2.68 × 10?12 59 Na3(VO)2(PO4)2F P42/mnm three (1–3) × 10?10 60 Sulfates Na2Fe(SO4)2·2H2O P21/c two 10?14 44 Na2Fe(SO4)2·4H2O P21/c one / 45 NaFe(SO4)2 C12/m1 two 9.01 × 10?10 (1273 K) 47 Na2+2xFe2?x(SO4)3 P21/c three 1 × 10?7 61 Orthosilicate Na2FeSiO4 P${\rm{\bar 1}}$ three (1.92–2.53) × 10?13 35 Na2MnSiO4 Pn one 2.37 × 10?15–8.62 × 10?14 38 Na2CoSiO4 Pn2a Three 1.29 × 10?13–1.06 × 10?12 40