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Lithium ion battery with improved over charge performance

A lithium-ion battery and overcharging technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as leakage, battery safety hazards, and user safety hazards, so as to improve safety performance and improve overcharging performance effect

Inactive Publication Date: 2013-09-11
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] The positive electrode includes the following components: 30% ternary material by weight, 60% lithium manganate, 4% polyvinylidene fluoride, and 6% conductive agent;

[0016] The negative electrode includes the following components: 95% graphite by weight, 2.5% aqueous binder, 1% sodium carboxymethyl cellulose, and 1.5% styrene-butadiene rubber binder.

Embodiment 2

[0018] The positive electrode includes the following components: 18% by weight of ternary material, 72% of lithium manganate, 4% of polyvinylidene fluoride, and 6% of conductive agent;

[0019] The negative electrode includes the following components: 94% graphite by weight, 3% water-based binder, 1% sodium carboxymethyl cellulose, and 2% styrene-butadiene rubber binder.

Embodiment 3

[0021] The positive electrode includes the following components: 56% ternary material by weight, 37% lithium manganate, 3% polyvinylidene fluoride, and 4% conductive agent;

[0022] The negative electrode includes the following components: 96% graphite by weight, 2.5% aqueous binder, 0.5% sodium carboxymethyl cellulose, and 1% styrene-butadiene rubber binder.

[0023] The electrolyte in the above-mentioned embodiment 1, embodiment 2 and embodiment 3 electrolyte is lithium hexafluorophosphate, and the conductivity of the electrolyte in the electrolyte is 8.5~9.5g / cm 3 , the acidity is 10-20ppm; the viscosity of the water-based binder in the negative electrode system is 7500±200MPa·s, the solid content is 15±0.2%, the particle size of the graphite of the negative electrode material is D50: 17-21μm, and the specific surface is 4 ~5m 2 / g, the specific capacity is greater than or equal to 340mAh / g, and the first discharge efficiency is greater than or equal to 93%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M4/62
CPCY02E60/10
Inventor 周明明杨佳星孙延先宋泽斌杨晓旭时培虎
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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