什么是钠电池电解液的离子电导率？

What is the ionic conductivity of electrolytes for sodium-ion batteries?

电解液离子电导率单位 S/cm，代表单位电场下钠离子迁移速率，是决定电芯内阻、快充与大功率放电的核心指标。电解液作为钠传输介质，电导率越高离子阻力越小，充电更快、大电流发热越少。该参数由钠盐解离度、溶剂粘度、环境温度、盐浓度四大变量决定。商用电解液常温稳定在 10?? S/cm，适配 0.2C-1C 常规充放电；低温下溶剂粘稠、钠盐解离受阻，电导率下降超 50%。配方设计混合高介电环状溶剂解离钠盐，搭配低粘度链溶剂提升流动性。电导率不合格会出现快充充不满、重载电压骤降、电芯超温等故障，户外低温储能、电动叉车大功率场景对该指标管控严苛，也是电解液企业核心研发优化方向。

Ionic conductivity of electrolytes, measured in S/cm, refers to sodium ion migration speed under unit electric field, a core indicator governing cell internal resistance, fast charging and high-power discharge. As sodium transport medium, electrolytes with higher conductivity feature lower ion resistance, faster charging and less heat generation under large currents. This parameter is determined by sodium salt dissociation, solvent viscosity, ambient temperature and salt concentration. Commercial electrolytes maintain 10?? S/cm at room temperature for standard 0.2C–1C cycling. At low temperatures, solvent viscosity rises and salt dissociation weakens, cutting conductivity by over 50%. Formulas blend high-dielectric cyclic solvents to dissociate salts and low-viscosity linear solvents to boost fluidity. Substandard conductivity leads to incomplete fast charging, sharp voltage drop under heavy loads and overheating. Outdoor low-temperature energy storage and electric forklifts have strict requirements, making conductivity the key R&D focus of electrolyte manufacturers.