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Method for preparing doping lithium-enriching spinelle lithium manganese oxide

A spinel type, lithium manganese oxide technology, applied in chemical instruments and methods, manganese compounds, lithium compounds, etc., can solve the problems of poor cycle performance of materials

Inactive Publication Date: 2008-02-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome LiMn 2 o 4 The disadvantage of poor cycle performance of materials, providing a preparation method of spinel lithium manganese oxide material with good cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example is used to illustrate the preparation method of the doped lithium-rich spinel lithium manganese oxide compound provided by the present invention.

[0022] 607.59 grams of lithium carbonate, 2873.71 grams of electrolytic manganese dioxide (D 50 = 6 microns) and 8.47 grams of Al 2 o 3 Mix evenly in 5,000 grams of deionized water, dry at 150° C., and then bake in a muffle furnace at 750° C. for 15 hours to obtain a first-stage sintered product. Take out the sintered product directly from the furnace, then pulverize it with a jet mill and pass through a 200-mesh sieve. Take 2998.68 grams of the sieved product and 6.07 grams of lithium carbonate and mix them evenly in 5000 grams of alcohol. Roast in a muffle furnace for 15 hours to obtain a two-stage sintered product. The sintered product was cooled with the furnace in the muffle furnace for 10 hours, down to room temperature, then taken out and pulverized with a jet mill to pass through a 200 mesh sieve to o...

Embodiment 2

[0024] This example is used to illustrate the preparation method of the doped lithium-rich spinel lithium manganese oxide compound provided by the present invention.

[0025] With 1103.91 grams of lithium nitrate, 2851.67 grams of electrolytic manganese dioxide (D 50 =8 microns) and 19.98 grams of magnesium oxide were mixed uniformly in 10,000 grams of deionized water, dried at 150°C and then roasted in a muffle furnace at 850°C for 12 hours to obtain a sintered product. Directly take out this sintered product from the furnace, then pulverize it with a jet mill and cross a 200 mesh sieve, get 2995.38 grams of this sieve and mix it with 44.15 grams of lithium nitrate in 10000 grams of alcohol and deionized water (volume ratio 1: 1) Mix evenly in a solvent, dry at 120°C, and then bake in a muffle furnace at 900°C for 10 hours to obtain a two-stage sintered product. The sintered product was cooled with the furnace in the muffle furnace for 8 hours, down to 60 ° C, and then taken...

Embodiment 3

[0027] This example is used to illustrate the preparation method of the doped lithium-rich spinel lithium manganese oxide compound provided by the present invention.

[0028] With 18.71 grams of lithium hydroxide, 577.45 grams of lithium carbonate, 2822.58 grams of electrolytic manganese dioxide (D 50 = 8 microns) and 88.09 grams of Cr 2 o 3 Mix evenly in 20,000 grams of alcohol, dry at 100°C, and then bake in a muffle furnace at 900°C for 10 hours to obtain a first-stage sintered product. Directly take out this sintered product from the furnace, then pulverize with jet mill and cross 200 mesh sieves, get 2992.34 grams of this sieve and 11.22 grams of lithium hydroxide, 34.62 grams of lithium carbonate in 20000 grams of alcohol and deionized water (volume ratio 1:1) in a mixed solvent, dried at 120°C and baked in a muffle furnace at 800°C for 12 hours to obtain a two-stage sintered product. The sintered product was cooled with the furnace in the muffle furnace for 12 hours,...

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PUM

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Abstract

The invention relates to a preparation method for doped lithium-rich spinel-type lithium manganese oxide. The process of the method is as follows: the lithium compound, the manganese compound and the doped metal compound are uniformly mixed, and then calcined in the baking furnace, wherein, the calcination consists of the primary calcination and the secondary calcination, the primary calcination comprises the manganese compound, the doped metal compound and a part of the lithium compound are uniformly mixed and calcined, and then the primary calcination product is obtained; the secondary calcination comprises the primary calcination product and the other part of the lithium compound are mixed and calcined. The material is charged and discharged between 3.0V to 4.2V, the first specific discharge capacity is above 140mAh / g, the capacity surplus rate is above 85 percent after two hundred charged and discharged circulation. The specific capacity of the lithium manganese oxide which is prepared by the invention is high, the cycle performance is excellent and is applied widely to the lithium ion batteries such as: coin-type, square, cylindrical.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion secondary battery cathode material, in particular to a preparation method of a doped lithium-rich spinel lithium manganese oxide. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, and the core part of lithium-ion batteries is its positive electrode material. Currently, LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Considered as the most attractive cathode material, LiCoO 2 and LiNiO 2 The theoretical specific capacity is about 275 mAh / g, and the actual specific capacity is about 140 mAh / g, but LiCoO 2 The material is expensive, LiNiO 2 Material preparation is more difficult, and these two materials especially LiNiO 2 Oxygen is released under high pressure, which creates a safety hazard. LiMn 2 o 4 Although the specific capacity is low, the theoretical specific capacity is 148 mAh / g, and the actual specific capacity is 90-120 mAh / g, but the mat...

Claims

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Application Information

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IPC IPC(8): C01G1/00C01D15/00C01G45/00H01M4/58
CPCY02E60/12Y02E60/10
Inventor 冯胜雷曹丽娟龚振刚姜占峰
Owner BYD CO LTD
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