Sodium dodecyl sulfate (SDS) and polyethylene glycol (PEG) were used as dispersant in the water paste technology of Li-ion battery cathode. Their effects on the performance of lithium iron phosphate (LiFePO4) were studied by the tests of AC impedance, cyclic voltammetry and charge-discharge. When the content of dispersant SDS was 0.6% , the specific capacity of battery was improved, the cycle performance was stable. After 20 cycles with different rates, the specific capacity of battery was 87.82 mAh/g, the capacity retention rate reached to 63.3% . When the content of dispersant PEG was 0.4%, after 20 cycles with different rates, the specific capacity of battery decreased from 143.61 mAh/g of 0.20 C to 107.14 mAh/g of 2.00 C, the capacity retention rate was 74.6%, the cycle stability and large current performance were fine.%分别将十二烷基磺酸钠(SDS)和聚乙二醇(PEG)用作锂离子电池正极水性合膏工艺的分散剂.用交流阻抗、循环伏安和充放电测试,研究了它们对磷酸铁锂( LiFePO4)性能的影响.经20次不同倍率的循环,当分散剂SDS的含量为0.6％时,电池的比容量为87.82 mAh/g,容量保持率为63.3％；当分散剂PEG的含量为0.4％时,电池的比容量由0.20 C时的143.61 mAh/g降至2.00 C时的107.14 mAh/g,容量保持率为74.6％,循环稳定性和大电流性能较好.
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