Rapid charging and discharging and safe low-temperature lithium ion battery and preparation method thereof
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A lithium-ion battery, charging and discharging technology, applied in the field of preparation of low-temperature lithium-ion batteries, can solve problems such as limited degree, achieve the effects of increasing compaction density, improving bonding performance, and reducing migration distance
Inactive Publication Date: 2020-06-12
LONG POWER SYST NANTONG CO LTD
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However, the degree of improvement in low-temperature electrochemical performance is limited only from the aspect of improving electron migration.
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[0040] like Figure 1-3 As shown, a method for making a fast charging and discharging and safe low-temperature lithium-ion battery comprises the following steps:
[0041] Step 1. Preparation of positive electrode active material solvent: 7 grams of polyvinylidene fluoride copolymer (PVDF-HFP) was added to 180 grams of acetone to fully stir and dissolve to form a viscous liquid.
[0042] Step 2. Positive sheet production: Add 60 grams of macromolecular plasticizer DBP, 140 grams of lithium iron phosphate positive electrode material, 2.5% of carbon nanotube conductive agent and 1.5% of SP conductive agent to step 1 The viscous liquid is fully mixed, and stirred evenly with a mixer to obtain a viscous positive electrode slurry; the positive electrode slurry is evenly coated on the front and back sides of the nano-microporous carbon-coated aluminum mesh 7 to form the positive electrode coating 1, and then placed Dry in an oven at 80°C for 4 hours to remove the acetone solvent, th...
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Abstract
The invention discloses a rapid charging and discharging and safe low-temperature lithium ion battery and a preparation method thereof. The low temperature is -45 DEG C. The multiplying power of rapidcharging is 3C and 5C respectively, and the multiplying power of rapid discharging is 1C and 10C respectively. The battery mainly consists of five parts, namely a positive plate, a negative plate, aceramic diaphragm, electrolyte and a battery shell, and is prepared by sequentially stacking the positive plate, the ceramic diaphragm, the negative plate and the ceramic diaphragm in sequence, putting the stacked parts into the battery shell, injecting the electrolyte, performing formation, performing sealing and performing capacity grading. The beneficial effects of the lithium ion battery are fully explained through preferred materials such as positive / negative materials, a ceramic diaphragm, an electrolyte, a battery case, a nano-microporous carbon-coated aluminum mesh, a nano-microporouscopper mesh, a polymer adhesive, a high-temperature insulating tape, a macromolecular plasticizer and the like and a preferred process technology. The process is simple and convenient, low in production cost and very suitable for application in the fields of electric vehicles, large-scale energy storage, military starting power supplies and the like.
Description
technical field [0001] The invention relates to the technical field of power and energy storage lithium-ion secondary batteries, in particular to a method for preparing a fast charging and discharging and safe low-temperature lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long charge and discharge life, low self-discharge rate and no memory effect, making them more and more widely used in civilian markets such as portable electronic devices and power tools. However, its poor low-temperature performance, fast charging and discharging performance, and safety and stability performance limit its application in special fields such as aviation, aerospace, special communications, polar expeditions, and military industry. For example, the low-temperature fast charging performance of current lithium-ion batteries, especially in low-temperature environments below -30°C, is very poor, mainly ma...
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