Lithium iron phosphate battery cell, high-energy-density lithium iron phosphate battery and preparation method of battery

A lithium iron phosphate battery, high energy density technology, applied in the direction of cylindrical shell battery/battery, battery electrode, lithium storage battery, etc., can solve the problems of low energy density of the system, difficult to meet the mileage requirements of the whole vehicle, etc., to improve the battery Increased capacity, energy density of a single unit, and the effect of ensuring safety

Inactive Publication Date: 2020-06-05
QINGDAO GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above safety and cost issues, in the subsidy-free era after 2020, lithium iron phosphate batteries have obvious advantages. The disadvantage is that the energy density of lithium iron phosphate batteries in the current market is only 150-180Wh / kg, and the energy density of the system is low. At 140Wh / kg, it is difficult to meet the cruising range requirement of a vehicle of more than 400km

Method used

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  • Lithium iron phosphate battery cell, high-energy-density lithium iron phosphate battery and preparation method of battery

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A lithium iron phosphate battery cell, which is made by overlapping and winding a positive pole piece, a first separator, a negative pole piece, and a second separator in sequence;

[0048] The positive electrode sheet includes a positive electrode current collector and a positive electrode coating coated on the surface of the positive electrode current collector. The positive electrode coating is made of the following raw materials in parts by mass: 96-98 parts of lithium iron phosphate, 0.5-0.7 parts of superconducting carbon black, 0.5-0.8 parts of graphene conductive agent, 1.0-2.0 parts of binder, lithium iron phosphate, under the condition of full battery 1C discharge rate, the gram capacity is 150-151mAh / g;

[0049] The negative electrode sheet includes a negative electrode current collector and a negative electrode coating coated on the surface of the negative electrode current collector. The negative electrode coating is made of the following raw materials in pa...

Embodiment 2

[0055] A lithium iron phosphate battery cell, which is made by overlapping and winding a positive pole piece, a first separator, a negative pole piece, and a second separator in sequence;

[0056] The positive electrode sheet includes carbon-coated aluminum foil and a positive electrode coating coated on the surface of the carbon-coated aluminum foil. The positive electrode coating is made of the following raw materials in parts by mass: 97 parts of lithium iron phosphate, 0.7 parts of superconducting carbon black, and 0.8 parts of graphene conductive agent , 1.5 parts of binder, lithium iron phosphate under the condition of 1C discharge rate of the full battery, the gram capacity is 150mAh / g; the carbon-coated aluminum foil includes the aluminum foil base material and the carbon layer compounded on both sides of the aluminum foil base material, and the thickness of the aluminum foil base material is 10 μm, and the thickness of one side of the carbon layer is 1 μm.

[0057] Th...

Embodiment 3

[0080] The difference between embodiment 3 and embodiment 2 is only:

[0081] In lithium iron phosphate battery cells, the surface density of the positive electrode coating is 400g / m 2 , Roll compacted density 2.35g / cm 3 ; The areal density of the negative electrode coating is 188g / m 2 , Roll compacted density 1.68g / cm 3 .

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Abstract

The invention discloses a lithium iron phosphate battery cell, a high-energy-density lithium iron phosphate battery and a preparation method of the battery, wherein the lithium iron phosphate batterycell is prepared by sequentially overlapping and winding a positive pole piece, a first diaphragm, a negative pole piece and a second diaphragm, the positive pole piece comprises a positive current collector and a positive coating coated on the surface of the positive current collector, and the negative pole piece comprises a negative current collector and a negative coating coated on the surfaceof the negative current collector. According to the invention, the monomer energy density of the lithium iron phosphate battery is improved to 190-195 Wh / kg, and the energy density of the system aftergrouping exceeds 140 Wh / kg, so that the endurance requirement of a passenger vehicle of more than 400 km is met, and a solution is provided for the wide application of the lithium iron phosphate battery in the field of passenger vehicles.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium iron phosphate battery cell, a high energy density lithium iron phosphate battery and a method for preparing the battery. Background technique [0002] According to reports, in 2018, there were 52 electric vehicle safety accidents in China, more than 20 electric vehicle fire accidents occurred from January to June 2019, and a total of 9 recalls occurred during the same period, involving 29,976 vehicles. During the rapid development of the new energy vehicle industry, ensuring the safety of vehicles is always the top priority. [0003] On June 25, 2019, the new policy of subsidy for new energy vehicles was officially implemented. The national subsidy standard was reduced by nearly 50%. Combined with local subsidies, the maximum subsidy reduction reached 75%. After 2020, new energy vehicle subsidies will be fully reduced. Power batteries account for about 50% of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/58H01M4/66H01M10/04H01M10/052H01M10/0587C01B25/26C01B25/37C01B25/45
CPCH01M4/5825H01M10/052H01M10/0587H01M4/667H01M10/0422C01B25/26C01B25/45C01B25/375H01M50/431H01M50/411Y02E60/10Y02P70/50
Inventor 左阳李新峰臧强
Owner QINGDAO GUOXUAN BATTERY CO LTD
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