Research On The Preparation Of Manganese Dioxide Composite Materials By Recycling The Cathode Material Of The Waste Ternary Power Lithium Battery

With the rapid development of the new energy automobile industry and the widely application of the ternary power lithium battery in the automobile,the recycling problem of waste ternary power lithium battery is becoming more and more serious.Owing to the ternary power cell still has residual power when it is abandoned,It can not be directly treat by breaking,etc.And strategic resources nickel,cobalt,manganese concentration distribution on the cathode current collector,its abundance is much greater than natural minerals,in addition,China's nickel,cobalt,and manganese are highly dependent on foreign countries,which is detrimental to the country's economic development,at present,the recycling of nickel,cobalt,and manganese in cathode materials has become a hot spot in the current research,but less research has been conducted on the subsequent use of recycled products.In order to realize the resource utilization of waste ternary power lithium battery,the dissertation researches the discharge of series power battery module by using self-made load discharger.It is found that the smaller the ratio of voltage and current of the series module,the discharge time is shorter.When the voltage of a single module is lower than 0.8 V and the current is lower than 0.03 A,the safety short circuit and other subsequent operation requirements can be satisfied;As most of the valuable resources of waste ternary power lithium batteries are concentrated on the cathode current collectors,the heat stability and metal component content of the cathode current collectors of waste ternary power lithium batteries have been found,under 540°C and aerobic conditions,polyvinylidene fluoride and acetylene black can be oxidized and decomposed at the maximum rate,at the same time,the contents of nickel,cobalt,manganese and lithium in cathode current collectors are found to be10.37%,4.82%,36.54%and 4.32%,respectively,have great value for recycling;In order to realize the recovery of metal resources,two different leaching methods were used to study,the results showed that the ratio of the cathode material to 1 mol·L^-11 sulfuric acid was 1:25?g:mL?,and the ratio of cathode material to 30%hydrogen peroxide was 1:1?g:mL?.the ratio of cathode material to K₂S₂O₈ was 1:8?g:g?,and the reaction is carried out at 90°C for 3hours,and the leaching rate of nickel,lithium,cobalt in the cathode material can reach 99%,at the same time,99.5%manganese in the cathode material can form?-MnO₂ particles.In order to realize the reuse of recovered product manganese dioxide,the phase change microcapsules were prepared by adding manganese dioxide,and the performance of manganese dioxide addition was studied,The results showed that when manganese dioxide was added in 0.5%of the total core material and wall material,the coating rate reached97.24%.Enthalpy of phase transition reaches 123.5919 J·g^-1,and the thermal conductivity up to 0.2374W·?m·K?^-1,which can effectively increase the latent heat and thermal conductivity of n-octadecane phase change microcapsules.The research shows that this recycling and reuse process is feasible,and provides new research ideas for the recycling and reuse of cathode materials for waste ternary power lithium batteries.