Abstract:AA1500 type Ni-MH batteries were prepared by using commercially available A2B7 type La-Mg-Ni hydrogen storage alloy as negative electrode material, and adding Y2O3, La2O3, ZnO and MgO as additives. The discharge capacity, internal resistance of charging state, self-discharge, cycle life and overcharge performance of the battery were tested and analyzed. The results showed that the discharge capacity of the batteries with Y2O3 and La2O3 at 0.2C discharge rate was much the same as that of the batteries without the addition of Y2O3 and La2O3, while the discharge capacity of the batteries with MgO and ZnO as additives was 7.2mAh and 17.1mAh lower than that of batteries without the addition of MgO and ZnO, respectively. The addition of negative electrode additive increased the internal resistance of the battery. However, the self-discharge performance of the battery made by adding additives was improved to varying degrees. The charge retention rate of the batteries prepared by adding MgO can still reach 80.1% after 7 days storage at 55 C. The addition of Y2O3 and La2O3 had better overcharge resistance than that of batteries not added. The cycle life of batteries made by adding Y2O3 was significantly improved, and the capacity retention rate reached 86.19% after 200 cycles.