Studies On The Electrochemical Properties Of The Sn-based Alloy Anode Material Of Lithium-ion Battery

From the industrial revolution, the battery industry has been growing at an amazing speed. There are two reasons that cause the challenges of the battery industry. one is the rapid growth, another is the more stringent requirements of the batteries. To face this serious challenge, its theoretical and practical limits maybe an obstacle to the battery replacement. However, the battery system has a significant development.The market of lithium-ion batteries have been expanded steadily and continuously. Compared to other batteries, Li-ion batteries have many advantages, such as the higher capacity. Since its birth, the advantages make it become the best comprehensive performances of the battery system. See From the developing history of the Li-ion batteries, the research of the anode materials is very important for the Li-ion battery industry. In the market, the anode of the Li-ion battery mainly uses carbon. However, the carbon anode has many shortages. Its first cycle efficiency is very low, and its capacity is also low. Those conditions make the researchers develop new anode materials, which behaves good performances.The study firstly introduces the development and the composition of lithium ion battery, explain the way lithium ion battery works, and reviews relevant previous studies, then focuses on how to prepare a series of multi-alloy anode materials, introduce High-Energy Mechanical Milling(HEMM) method. Using alloy phrase diagrams and SEM images, I analyzed the structure of alloys and tested the electrochemical properties.(1)Through HEMM under Ar atomosphere, Sn1.8SiFeBio.18Zno.o18 alloys were fabricated. Then I studied their electrochemical properties. I found that the pressure could affect the cells'performances. By experiment, we found under 6MP pressure, cells' performances are better than 4MP. Under 6MP pressure, the initial discharge capacity of the Sn1.8SiFeBio.18Zno.o18 alloy anode is 527.3mAh/g,the first coulombic efficiency is 67.4%, after 20 cycle, the coulombic efficiency is 92.6%. The alloy anode shows a good cycling performance.(2)Through HEMM under At atomosphere, Sn15Ni5Zn alloys were fabricated. Then I studied their electrochemical properties. (3)Through HEMM under Ar atomosphere, Sn15Sb1.5Bi1.5Cu10Al3.3 alloys were fabricated. Then I studied their electrochemical properties. The test showed that, the initial discharge capacity of the SnSbBiCuAl—B alloy anode is 527.3 mAh/g, the initial charge capacity is 518.1mAh/g, the first coulombic efficiency is 63.7%; the initial discharge capacity of the SnSbBiCuAl—A alloy anode is 327.5mAh/g, In the first cycle the electrode ruptured.