Material performance detection method:

　　Mix high-temperature manganese dioxide: conductive agent: adhesive in a ratio of 92:4:4, use ethanol as the solvent, and roll the film to make a positive electrode sheet.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%

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　　The obtained positive electrode sheet, lithium sheet, polypropylene separator, and electrolyte were assembled into a CR2032 battery for detection.

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