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Anode active substance and lithium-ion secondary battery prepared with same

A positive active material and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of short material life and poor high temperature performance, achieve good electrical conductivity, improve life and high temperature performance, and coat Layer dense and uniform effect

Inactive Publication Date: 2012-06-27
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the invention is to provide a method to overcome existing LiMn 2 o 4 Positive electrode active material method for problems such as short material life and poor high-temperature performance, and preparation of lithium-ion secondary battery using the positive-electrode active material. The lithium-ion secondary battery prepared by using the positive-electrode active material has excellent performance, long life, and good high-temperature performance

Method used

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  • Anode active substance and lithium-ion secondary battery prepared with same
  • Anode active substance and lithium-ion secondary battery prepared with same
  • Anode active substance and lithium-ion secondary battery prepared with same

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, and then add LiMn 2 o 4 and ball milled for 3 hours to obtain a slurry, heated and stirred at 170°C until the sample was dried to obtain LiMn 2 o 4 Composite material, the LiMn 2 o 4 The composite material is fed with Ar or N 2 Or bake at 800°C for 24 hours under vacuum, and then cool down to room temperature to obtain the positive electrode active material. The spherical oxide and the rod-shaped oxide are respectively zirconia, LiMn 2 o 4 It can be prepared by methods disclosed in the art, and can also be purchased through suppliers. The aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 6, and the particle size and rod-shaped oxide of the spherical oxide The longest side of the object is 2 μm, the mass fraction of th...

Embodiment 2

[0029] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, and then add LiMn 2 o 4 and ball milled for 3 hours to obtain a slurry, heated and stirred at 170°C until the sample was dried to obtain LiMn 2 o 4 Composite material, the LiMn 2 o 4 The composite material is fed with Ar or N 2 Or bake at 800° C. for 30 hours under vacuum, and then cool down to room temperature to obtain the positive electrode active material. The spherical oxide and the rod-shaped oxide are respectively magnesium oxide, LiMn 2 o 4 It can be prepared by methods disclosed in the art, and can also be purchased through suppliers. The aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 2, and the particle size and rod-shaped oxide of the spherical oxide The longest side of the object is 3 μm, the mass fract...

Embodiment 3

[0031] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, and then add LiMn 2 o 4 and ball milled for 3 hours to obtain a slurry, heated and stirred at 170°C until the sample was dried to obtain LiMn 2 o 4 Composite material, the LiMn 2 o 4 The composite material is fed with Ar or N 2 Or bake at 800° C. for 36 hours under vacuum, and then cool down to room temperature to obtain the positive electrode active material. The spherical oxide and the rod-shaped oxide are respectively yttrium oxide, LiMn 2 o 4 It can be prepared by methods disclosed in the art, and can also be purchased through suppliers. The aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 4, and the particle size and rod-shaped oxide of the spherical oxide The longest side of the object is 0.005 μm, the mass fra...

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Abstract

The invention discloses a preparation method for an anode active substance, which includes the steps: mixing spherical oxides and rodlike oxides to obtain mixed oxides; placing the mixed oxides into N-methyl pyrrolidone liquor of polyvinylidenefluoride for ball-milling and mixing; then adding LiMn2O4 (lithium manganese) and obtaining slurry by means of ball-milling and mixing; heating and stirring the slurry to dryness so as to obtain composite LiMn2O4 materials; and roasting the composite LiMn2O4 materials in an Ar (argon), N2 (nitrogen) or vacuum atmosphere, and cooling the roasted composite LiMn2O4 materials to the room temperature, so that the anode active substance is obtained. A lithium-ion secondary battery comprises a battery case, electrode assembly and electrolyte, the electrode assembly and the electrolyte are packaged in the battery case, the electrode assembly consists of an anode piece, a cathode piece and diaphragms, the anode piece comprises a current collector and a coating layer arranged on the current collector, the coating layer comprises the anode active substance and bonder, the anode active substance comprises the LiMn2O4 and an oxide coating layer coated on the surface of the LiMn2O4, and the oxide coating layer consists of spherical or near-spherical secondary particles. The lithium-ion secondary battery prepared with the anode active substance is excellent in performance, long in service life and fine in high-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a positive electrode active material and a lithium ion secondary battery prepared by using the positive electrode active material. Background technique [0002] The development of lithium-ion secondary batteries has a history of 20 years. So far, the transition metal oxides that can form intercalated compounds with lithium are the most researched. In the past two decades, people have found six practical positive electrode active materials through the research on lithium-ion secondary battery electrode materials: lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ), lithium vanadate (Li 1+x V 3 o 8 ), lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) and lithium iron phosphate (LiFePO 4 ) and various doping compounds derived from them. LiCoO 2 It is highly toxic and expensive, and it is difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘国刚
Owner IRICO