Investigations On The Aluminum Alloying For Aluminum-air Battery

Currently,the world is facing energy shortage and environmental pollution crisis.The development of new green energy technologies is therefore in urgent demand.Considering these two aspects,aluminum-air battery is undoubtedly considered as an ideal power system to tackle these problems.The electrochemical performance of aluminum alloy anode is the key factor to improve the performance of the aluminum-air battery.Therefore,to develop a new kind of aluminum anode with great performance has become a hot sopt in recent years.In this paper methods such as the quantum chemistry calculation,anodic polarization curve,constant current discharge test analysis,XRD and XRF are used to study the aluminum alloy.The energy of different aluminum alloy systems was calculated by Castep and it can be seen that the addition of the alloy elements increases the energy of the aluminum alloy systems and their energies increase in the following order: Al(-450 eV)<Al-Sn(-489eV)<Al-Zn(-665eV)<Al-Pb(-1048eV)<Al-Mg(-1369eV)<Al-Te(-1457eV)<Al-In(-1954eV)<Al-Ga(-2447eV).The electrochemical test results show that the electrochemical performances of the binary aluminum alloys have been improved greatly.The open circuit potential of Al-In alloys are the most negative among all the elements and its open circuit potential can reach at-1.58 V while the its concentration is 0.13wt%;The current density of the Al-Mg alloys are the highest among all the elements and its current density can reach at 60.4mA/cm2?The utilization ratio of the Al-Pb alloys are the highest among all the elements and its utilization ratio can reach at 81.1%.The aluminum alloys are sorted by current densities and its order is as follows: Al-Te(42.4mA/cm2)<Al-Zn(43.4mA/cm2)<Al-Sn(44.4mA/cm2)<Al-Pb(44.5mA/cm2)<Al-In(45.7mA/cm2)< Al-Ga(48.8mA/cm2)<Al-Mg(60.4m A/ cm2);The order sorted by open circuit potential is as follows: Al-Te(-1.372V)<Al-Sn(-1.392V)<Al-Mg(-1.395V)<Al-Pb(-1.410V)<Al-Ga(-1.447V)<Al-Zn(-1.469V)<Al-In(-1.583V);The order sorted by utilization ratio is as follows: Al-In(72.6%)< Al-Zn(73.0%)< Al-Mg(75.1%)< Al-Ga(76.2%)< Al-Sn(80.5%)<Al-Pb(81.1%).The electrochemical test results show that the electrochemical performances of the ternary aluminum alloys have been improved greatly.The Al-0.02Ga-0.7Pb aluminum alloy possesses the highest utilization ratio(80.2%)among all the ternary aluminum alloys.The composition of the aluminum alloy which possesses the highest open circuit potential(-1.490V)is Al-0.5Pb-0.4Zn.The Al-0.5Pb-0.3Mg aluminum alloy possesses the highest current density(56.9mA/cm2)among all the aluminum alloys.The electrochemical test results of the aluminum-air batteries assembled by the ternary aluminum alloys show that Al-0.5Pb-0.3Mg possesses the highest power density(36.5mW/cm~2)...