Dissertation > Excellent graduate degree dissertation topics show

Research of Laminated LiFePO4 Li-ion Battery Swollen

Author: WangZiJun
Tutor: TangZhiYuan；XuQiang
School: Tianjin University
Course: Applied Chemistry
Keywords: Lithium ion battery Inflatable SEI film Crafts
CLC: TM912
Type: Master's thesis
Year: 2009
Downloads: 176
Quote: 1
Read: Download Dissertation

Abstract


The lithium ion secondary battery (Lithium-ion Battery) appeared in the early 1990s, a new green chemical power. It has a high voltage, specific energy, good cycle performance the Security Performance Excellence advantages, one of the latest developments in the direction of the chemical power industry. The lithium-ion battery production has begun to take shape, but facing some quality problems in the production process, such as bloating, micro short. Especially the battery into stage gas and storage stages inflatable is a more complex problem, which severely restricted the industrial production yield. Wanli Battery Company's actual production statistics, lithium iron phosphate battery produced the shelving 10 months at room temperature, 153 battery not inflatable battery 83, and 57 minor inflatable battery inflatable battery 13, the inflatable was 45.7%. With the extension of the standing time, still increasing number of inflatable cell. The gas inside the battery so that the increased pressure within the battery, battery bulging electrode laminated structure separating substances isolated, resulting in a safety hazard. Flatulence problem in order to solve the actual production of battery, test preparation 724,566 Liquid flexible packaging lithium iron phosphate lithium-ion battery, battery and by changing the process parameters to simulate flatulence. Analysis of characteristics of the electrochemical reaction of the battery using the AC impedance method; charge-discharge cycle test test battery charge and discharge characteristics and cycle characteristics; measuring the gas production of the battery; by gas chromatography analysis of the type of gas. By changing the baking time to study the influence of moisture on the battery inflatable the test proved battery inflatable degree increases with increasing moisture. AC impedance spectroscopy showed that the moisture content for a long time the battery is formed in the first forming process of the SEI film thicker, poor stability, larger interfacial impedance. The charge-discharge curves and cycle curve shows that the strict control of moisture is conducive to the performance of the play of the battery. The different current Batteryformation, results showed that the current density will affect the composition of the SEI film. Compared three Kasei system influence on the battery performance, the results show that reducing the battery reaction in the formation process in the getter, can reduce the irreversible loss of capacity. Through the gas species of the the flatulence battery storage process, the analysis of the performance of the loop. We believe that the destruction of the SEI film is the direct cause of the battery inflatable. To ensure good SEI film is formed in the formation process for the first time, and in the subsequent storage or during the cycle is not destroyed, the baking and the formation process of the battery is improved. The process improved battery inflatable phenomenon significantly reduced to achieve the production requirements.

Related Dissertations

  1. Synthesis of t- butyl alcohol using tert-butylbenzene, the catalyst selection and research,TQ241.1
  2. Experimental Research on Vibratory Mixing Asphalt Cement Mortar,U214
  3. Folding Analysis of Elastic Memory Composite Thin Sheet,O343
  4. Research on Silicon Based Anode for High Capacity Lithium Ion Batteries,TM912.9
  5. Preparation and Performance of Nano-composite Polymer Electrolytes,TM912
  6. Study on the Synthesis of Piperonyl Butoxide,TQ450.45
  7. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  8. Research of the Battery Management System for EV,TM912
  9. Lithium iron phosphate / hard carbon lithium-ion battery technology and Electrochemical Performance,TM912
  10. Study on High-performance Electrode Materials for Lithium Ion Batteries,TM912
  11. Study on Synthesis Methods and Property of the Cathode Material LiFePO4 for Lithium Ion Battery,TM912
  12. Synthesis and Modification of Layered Compound Cathode Material for Lithium-ion Batteries,TM912
  13. Synthesis of a Novel Hypercrosslinked Resin Via Photochlorination-alkylation and Its Adsorption Performance Study of Phenol,O647.31
  14. Preparation and Performance Studies of Si-SiO_x-Sn/C Anode Material for Li-ion Batteries,TM912
  15. Seris of Products Development and Key Technical Study of Fermented Soya Beans,TS214.2
  16. The Bai construction windows and doors decorative art research,J525
  17. Warring States Qin and Han Decoration Technics Process of Lacquer,J527
  18. Research of the Intellectual Property Protection of the Traditional Craft,G122
  19. Studies on the Technologies of Male Silkworm Cocoon Drying and Cooking,S886
  20. Analysis of Properties and Control System Primary Design on New Pattern Overpressure Inflatable Parafoil Vehicle,V221
  21. Recovery of Metal from Spent Lithium-ion Batteries,TM912

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
© 2012 www.DissertationTopic.Net  Mobile