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High magnification polymer lithium ion power battery and preparation method thereof

A power battery and polymer technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as explosion, unfavorable high-rate discharge of batteries, and low conductivity of lithium titanate, so as to improve voltage and The effect of outputting specific energy and improving high-current discharge performance

Inactive Publication Date: 2011-07-20
BEIJING SHENZHOU YUANWANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The electronic conductivity of pure lithium titanate is very low, only 10 -9 S / cm is not conducive to high-rate discharge of the battery, and it is prone to safety problems such as explosion when the battery is overcharged

Method used

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  • High magnification polymer lithium ion power battery and preparation method thereof
  • High magnification polymer lithium ion power battery and preparation method thereof
  • High magnification polymer lithium ion power battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Positive electrode preparation: 92% of the surface is coated with AlPO 4 LiNi 0.5 mn 1.5 o 4 , 3% conductive carbon black, 1% nano-silver rods and 4% polyvinylidene fluoride (PVDF) are mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on the aluminum current collector, and finally 105 ° C Dried and compacted, cut into a size of 240*160mm to obtain the positive electrode.

[0030] Negative electrode preparation: 92% of lithium titanate (purchased from Shenzhen Beiterui New Energy Materials Co., Ltd., whose surface is coated with cracked carbon, wherein carbon: lithium titanate = 3: 97, but not limited to carbon: lithium titanate = The ratio of 3:97 can be carbon: lithium titanate = 1~8:92~99), 4% conductive carbon black and 4% polyvinylidene fluoride (PVDF) mixed in N-methylpyrrolidone (NMP) Slurry was formed, evenly coated on the copper foil, and finally dried and compacted at 105°C, and cut into a size of 242*163mm to obtain the negative electrode....

Embodiment 2

[0035] Positive electrode preparation: 90% of the surface is covered with AlPO 4 LiNi 0.5 mn 1.5 o 4, 3% conductive carbon black, 3% carbon nanotubes and 4% polyvinylidene fluoride (PVDF) are mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on the aluminum current collector, and finally 105 ° C Dried and compacted, cut into a size of 240*160mm to obtain the positive electrode.

[0036] Negative electrode preparation: 90% of the surface is coated with cracked carbon lithium titanate (purchased from Shenzhen Beiterui New Energy Materials Co., Ltd., wherein carbon: lithium titanate = 3: 97, but not limited to carbon: lithium titanate = The ratio of 3:97 can be carbon: lithium titanate = 1~8:92~99), 6% conductive carbon black and 4% polyvinylidene fluoride (PVDF) mixed in N-methylpyrrolidone (NMP) Slurry was formed, evenly coated on the copper foil, and finally dried and compacted at 105°C, and cut into a size of 242*163mm to obtain the negative electrode.

...

Embodiment 3

[0041] Positive electrode preparation: 88% of the surface is coated with AlPO 4 LiNi 0.5 mn 1.5 o 4 , 2% conductive carbon black, 2% nano-silver rods and 8% polyvinylidene fluoride (PVDF) are mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on the aluminum current collector, and finally 105 ° C Dried and compacted, cut into a size of 240*160mm to obtain the positive electrode.

[0042] Negative electrode preparation: Lithium titanate (purchased from Shenzhen Beiterui New Energy Materials Co., Ltd., with 88% of the surface coated with cracked carbon, wherein carbon: lithium titanate = 3: 97, but not limited to carbon: lithium titanate = The ratio of 3:97 can be carbon: lithium titanate = 1~8:92~99), 2% conductive carbon black and 10% polyvinylidene fluoride (PVDF) mixed in N-methylpyrrolidone (NMP) Slurry was formed, evenly coated on the copper foil, and finally dried and compacted at 105°C, and cut into a size of 242*163mm to obtain the negative electrode...

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Abstract

The invention discloses a high magnification polymer lithium ion power battery and a preparation method thereof, and belongs to the field of lithium ion power batteries. Compared with the conventional batteries (1-10C), the discharge current of the battery is greatly promoted; and the magnification discharge can reach 20 to 25C. Aluminum phosphate (AlPO4) is coated on the surface of a high-voltage lithium ion anode material (LiNi0.5Mn1.5O4) in the anode; the anode mixture contains 78 to 92 percent of active substance, 4 to 11 percent of conductive agent and 4 to 11 percent of adhesive in percentage by weight; and the cathode contains 78 to 92 percent of surface cracked carbon coated lithium titanate, 4 to 11 percent of conductive agent and 4 to 11 percent of adhesive. The battery 2C, 8C and 25C discharge specific capacities of the lithium ion battery are 130mAh / g, 120mAh / g and 83.5mAh / g. The power battery can be used for various high-capacity high magnification discharge equipment such as electric vehicles, unmanned machines, power sources for submarines and the like.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a modified lithium titanate material as the negative electrode material, and AlPO coated on the surface as the positive electrode material. 4 5V cathode material LiNi 0.5 mn 1.5 o 4 . Background technique [0002] The rapid development of the automobile industry has promoted the progress and development of global machinery, energy, transportation and other industries. However, while fuel vehicles benefit mankind, their exhaust emissions have also caused serious pollution to the human living environment. According to statistics, 63% of the current air pollution components come from fuel vehicles, which has reached the level that must be strictly controlled and treated. As of January 1, 1994, the global proven oil reserves were 999.91 billion barrels (about 142.84 billion tons). If the average daily consumption in 1993 was 6,680 barrels, then within 46 years (that is, by 2043), the glob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M4/62H01M4/139
CPCY02E60/12Y02T10/7011Y02E60/122Y02E60/10
Inventor 胡晨郑存卫王小峰刘可加戴国群要智勇
Owner BEIJING SHENZHOU YUANWANG TECH
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