Electronic and structural aspects of chemical modified MnO~2 electrode were investigated by extent X-ray fine structure technology. The results show that doped bismuth exists in lattice of MnO~2, which improves stability of MnO~2 structury. The oxidation value of bismuth is steady. The first shell coordination number decreases with the increase of the Mn-O distance. There is no structural rearrangement of the Mn atoms under the conditions of 1-e discharge.

Key words: MANGANESE DIOXIDE, DOPE, MODIFICATION