High temperature type lithium manganese battery cathode materials research

Source: 2020 - 03 - 28 then hits: high temperature lithium manganese battery cathode material of high temperature lithium manganese battery is an important kind of power supply at a time, widely used in automobile tire pressure detection system ( TPMS) And medical instruments. Although China is a primary battery production country, but at the high end type high temperature of primary lithium battery in a blank state in the category. The lack of positive data for use in high temperature is one of the reasons for the limit of high temperature lithium manganese battery development. At above 100 ℃, the reaction of manganese dioxide and electrolyte is more and more intense, promote the differentiation of the electrolyte and the emergence of a large amount of gas in the form a layer on the surface of manganese dioxide slow oxidation layer, form ohm polarization increases. All of these lead to the lithium manganese battery function degradation at high temperatures, make it unable to work. Company is applicable to high temperature of manganese dioxide anode data carried on the thorough research, from the control of manganese dioxide electrode and the proportion of crystal, element doped high manganese dioxide ( g - mno2) Start. Data function verification method: according to the high temperature type manganese dioxide: conductive agent, binder = 92: lest the mixing ratio, with ethanol as solvent, take positive plate through the roll film legal system. The anode, lithium pills, polypropylene membrane, electrolyte as a CR2032 battery installation check. Battery check result: 1. The normal temperature ( 20± 5℃) Phase, constant discharge ( 8 - 3 - 1 - 5 - 0. 6 - 0. 3 ma / g) 2, by voltage. 0 v, the positive electrode data capacity is 264 mAh/g. 2. In the constant current phase ( 16 - 8 - 3 - 1. 5 - 0. 6 - 0. 3 ma / g) The low temperature ( 0± 2℃) Lower the electricity, discharge curve to the oscillation of temperature change, the discharge capacity of 261 mAh/g of data. 3. Under the 125 ℃ high temperature, battery discharge in 16 consecutive mA/g, cut-off voltage 2. 0v。 The battery discharge is normal, stable discharge curve, the positive data specific capacity is 260 mAh/g. Obviously, the data of high temperature discharging effect is better. 4. Cell in 125 ℃, 120 hours, and then use the 16 mA/g continuous discharge, discharge termination voltage 2. 0 v, the specific capacity of anode data 250 mAh/g, the positive data show that high temperature below 125 ℃ is relatively stable, adhere to the developmental or the degradation degree of differentiation is very small. 5. Battery under the condition of 150 ℃ for 8 hours, continuous discharge 16 mA/g, exceeded the TPMS system under the condition of 150 ℃ for 7 hours of work. Battery voltage path is normal, no exception path. Illustrate the positive data without a new phase, stable nature, battery may continue to discharge. Using the high temperature of manganese dioxide materials developed by the company CR2032 battery, in normal temperature, low temperature, high temperature ( 125℃、150℃) Conditions, the electric performance and durability test. Data specific capacity reached more than 260 mAh/g, stable discharge curve, manganese dioxide under the high temperature data remain relatively stable. The data is suitable for high temperature operation, and can be used for TPMS is data of the battery.