CR1220 battery

Research on positive electrode materials of high-temperature CR1220 battery

High-temperature CR1220 battery are an important primary power source, widely used in automobile tire pressure monitoring systems (TPMS) and medical instruments. Although my country is a major manufacturer of primary batteries, it is blank in the field of high-end high-temperature primary lithium batteries. The lack of positive electrode materials suitable for high-temperature applications is one of the reasons that restrict the development of high-temperature CR1220 battery. Above 100°C, the reaction between manganese dioxide and electrolyte becomes increasingly intense, causing the electrolyte to decompose and produce a large amount of gas, and an inert oxide layer is formed on the surface of manganese dioxide, causing ohmic polarization to increase. All these factors lead to the performance degradation of CR1220 battery at high temperatures and they cannot work. Our company has conducted in-depth research on manganese dioxide positive electrode materials suitable for high temperature use, starting with controlling the ratio of γ and β crystal forms of manganese dioxide, and doping elements to obtain high-temperature manganese dioxide (G-MnO2). Material performance test method: Mix high-temperature manganese dioxide: conductive agent: adhesive = 92:4:4, use ethanol as solvent, and make positive electrode sheets by rolling film. The obtained positive electrode sheet was assembled with lithium sheet, polypropylene separator and electrolyte into CR2032 battery for testing.

Battery test results:

1. At room temperature (20±5℃), the discharge was carried out with stage constant current (8-3-1.5-0.6-0.3mA/g), the cut-off voltage was 2.0V, and the specific capacity of the positive electrode material was 264mAh/g.

2. At low temperature (0±2℃), the discharge was carried out with stage constant current (16-8-3-1.5-0.6-0.3mA/g), and the discharge curve fluctuated due to temperature changes. The discharge specific capacity of the material was 261mAh/g.

3. At high temperature of 125℃, the battery was discharged with a constant current of 16mA/g, the cut-off voltage was 2.0V, the battery could be discharged normally, the discharge curve was stable, and the specific capacity of the positive electrode material was 260mAh/g. Obviously, the material has better high current discharge capacity at high temperature.

4. The battery was placed at 125℃ for 120 hours, and then discharged at a constant current of 16mA/g. The discharge cut-off voltage was 2.0V, and the specific capacity of the positive electrode material was 250mAh/g, indicating that the high-temperature positive electrode material remained relatively stable at 125℃, and the degree of decomposition or degradation was very small.

5. The battery was discharged at a constant current of 16mA/g at 150℃ for 8 hours, which exceeded the requirement of the TPMS system to work at 150℃ for 7 hours. The working voltage platform of the battery was normal, and no abnormal platform appeared, indicating that no new phase was generated in the positive electrode material, the properties were stable, and the battery could continue to discharge. The CR2032 battery made of the high-temperature manganese dioxide material developed by our company was tested for electrical properties and shelf durability at room temperature, low temperature and high temperature (125℃, 150℃). The specific capacity of this material reached more than 260mAh/g, the discharge curve was stable, and the manganese dioxide material remained relatively stable at high temperature. This material is completely suitable for working at high temperatures and can be used as a positive electrode material for TPMS batteries.

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