Lithium ion battery with improved over charge performance

Abstract

The invention relates to a storage battery, especially relates to a battery with improved over charge performance of lithium ion battery. An anode comprises the following components by weight: 18-56% of ternary material, 37-72% of lithium manganate, 3-4% of polyvinylidene fluoride and 4-6% of conductive agent; a cathode comprises the following components by weight: 94-96% of graphite, 25-3% of aqueous binder, 0.5-1% of carboxymethylcellulose sodium and 1-2% of butadiene styrene rubber binder, in the prerequisite that the routine lithium ion battery has the cycle life, the safety performance and the low temperature performance, the battery 1C is charged to 10V at constant current and constant voltage, and when the cut-off current is 0.01C, the temperature rises to 101 DEG C, and if the duration of charging is more than or equal to 3 hours, and the battery does not generate smoke, leak, fire and explode, thereby effectively improving the over charge performance of the battery and safety performance of the ternary material lithium battery.

Description

technical field [0001] The invention relates to a storage battery, in particular to a battery for improving the overcharge performance of a lithium ion battery. Background technique [0002] In China, there are more than 100 manufacturers involved in lithium iron phosphate power batteries, but the specific energy of lithium iron phosphate batteries is relatively low, and the low-temperature performance and consistency are relatively poor, so there are technical bottlenecks and it is difficult to achieve breakthroughs. Compared with the ternary material lithium battery, it is superior in specific energy, low temperature characteristics and consistency, but the overcharge performance of the battery in the prior art is not good. When the battery is used in large quantities, due to the poor overcharge performance of the battery, it is very difficult to It is easy to smoke, leak, or even catch fire. Most of the substances inside the battery are chemical substances. Smoke or leaka...

AI Technical Summary

Problems solved by technology

[0002] In China, there are more than 100 manufacturers involved in lithium iron phosphate power batteries, but the specific energy of lithium iron phosphate batteries is relatively low, and the low-temperature performance and consistency are relatively poor, so there are technical bottlenecks and it is difficult to achieve breakthroughs. Compared with the ternary material lithium battery, it is superior in specific energy, low temperature characteristics and consistency, but the overcharge performance of the battery in the prior art is not good. When the battery is used in large quantities, due to the poor overcharge performance of the battery, it is very difficult to It is easy to smoke, leak, or even catch fire. Most of the substances inside the battery are chemical substances. Smoke or leakage will bring great safety hazards to users, and even cause safety accidents. A fire is an electric fire or a chemical substance fire, which brings great inconvenience to fire extinguishing. Therefore, there are certain safety hazards in the large-scale use of batteries in the prior art, which greatly limits their scope of use.

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