In this work, compounds were prepared by arc melting method in the Ar atmosphere. The structure and grain size were tested by X-ray diffraction and TEM measurements. Electrochemical properties and battery parameter were carried out by bipotentiostat and battery tester equipments. The results show that with the grain size 50µm, capacity of the negative electrode was 77 mAh/g. When grain size of powder use for negative electrode reduces to 40nm, the capacity rapidly increase to 170 mAh/g and other battery parameter also improve. In this work, compounds were prepared by arc melting method in the Ar atmosphere. The structure and grain size were tested by X-ray diffraction and TEM measurements. Electrochemical properties and battery parameter were carried out by bipotentiostat and battery tester equipments. The results show that with the grain size 50µm, capacity of the negative electrode was 77 mAh/g. When grain size of powder use for negative electrode reduces to 40nm, the capacity rapidly increase to 170 mAh/g and other battery parameter also improve. | Influence of grain size on the electrochemical properties of compound use for Ni-MH battery
