Method for producing lithium battery anode material doped with multi-elements by secondary depositing method

A technology of secondary deposition and cathode material, applied in battery electrodes, circuits, electrode manufacturing, etc., can solve the problems of material performance deterioration, difficulty in meeting demand, and battery cycle performance deterioration.

Inactive Publication Date: 2007-06-20
CHONGQING TERUI BATTERY MATERIAL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But it has several problems: (1) The high price due to the lack of cobalt resources forces people to look for alternative materials with low price and good performance; (2) LiCoO 2 The development limitation of material energy density (there is no major breakthrough in several years after the development to 140mAh/g) makes it more and more difficult to meet the needs of the ever-changing electronic industry; (3) poor safety performance and high temperature performance, not suitable for manufacturing Make a large capacity battery
At present, the research at home and abroad mainly focuses on LiCoO 2 Alternative products Li(Co x Ni y mn z )O 2 , where: 02 , LiNiO 2 and LiMnO 2 It has the advantages of low cost, high charge and discharge capacity, and good safety performance. However, the compatibility

Method used

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  • Method for producing lithium battery anode material doped with multi-elements by secondary depositing method

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: the sulfate salt of Co and Ni, Mn, Mg, Al is made into 2mol / L solution by the ratio of 0.2:032:0.32:0.08:0.08, and the sodium hydroxide containing ammonia 13% is made into 4mol / L L solution is evenly pumped into the reactor with a metering pump, and the pH is controlled to be 10.8. The pH is controlled to 11, and the product is intermediate B, then filtered, washed, and dried; weigh an equimolar amount of lithium hydroxide, wet mix and grind with intermediate B, then dry at 110°C for 4 hours, and sinter at 450°C 20 hours, sintering at 950°C for 24 hours, pulverization, the structural formula of the generated product is: Li(Co 0.2 Ni 0.32 mn 0.32 Al 0.08 Mg 0.08 )O 2 -0.15LiCoO 2 , its X-ray diffraction pattern is shown in Figure 2, and Figure 3 is the product topography image. The product was made into a battery according to the requirements and tested. The results are as follows (see Figure 1): initial discharge capacity (C / 5 4.2-2.8V): 155mAh / g, d...

Embodiment 2

[0033] Embodiment 2: the sulfate salt of Co and Ni, Mn, Mg, Al, Ti presses the ratio of 0.2: 0.28: 0.28: 0.08: 0.08: 0.08, is made into 2mol / L solution, will contain ammoniacal 13% sodium hydroxide Become 4mol / L solution, evenly pump into reaction kettle with metering pump, pH control is 10.8, and its product is intermediate A, then evenly pumps into 15% (relative to the amount of intermediate A) cobalt and Alkaline solution, PH is controlled to 11, then filtered, washed, and dried; Weigh an equimolar amount of lithium hydroxide, wet mix and grind with the intermediate, then dry at 100°C for 4 hours, sinter at 400°C for 16 hours, and sinter at 1000°C Pulverize after 22 hours, the structural formula of generating product is Li(Co 0.2 Ni 0.28 mn 0.28 Al 0.08 Mg 0.08 Ti 0.08 )O 2 -0.15LiCoO 2 , the product was made into a battery according to the requirements, and the test results were as follows: the first discharge capacity (C / 5: 4.2-2.8V): 155mAh / g, the discharge capaci...

Embodiment 3

[0034] Embodiment 3: the sulfate salt of Co and Ni, Mn, Mg, Al presses the ratio of 0.30: 0.28: 0.28: 0.07: 0.07, is made into 2mol / L solution, and the sodium hydroxide that contains ammonia 15% is made into 4mol / L L solution is evenly pumped into the reaction kettle with a metering pump, and the pH control is 11.2, and its product is intermediate A, and then evenly pumped into 28% (relative to the amount of intermediate A) cobalt and alkali solution with a metering pump, Control the pH to 11, then filter, wash, and dry; weigh equimolar lithium hydroxide, wet mix and grind with the intermediate, then dry at 110°C for 4 hours, sinter at 500°C for 18 hours, and sinter at 1100°C for 20 hours. Pulverized, the structural formula of the generated product is Li(Co 0.30 Ni 0.28 mn 0.28 Al 0.07 Mg 0.07 )O 2 -0.28 LiCoO 2 , the product was made into a battery according to the requirements for testing: the first discharge capacity (C / 5, 4.2-2.8V): 159mAh / g, the discharge capacity a...

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Abstract

Production of lithium-battery positive material doped by multi-elements by secondary depositing method is carried out by doping and coating for at least two elements from Al, Mg, Ti and Cr in Li(CoxNiyMnz) by co-deposition, forming into intermediate A, forming intermediate B coated by Co(OH)2 on intermediate A by co-deposition, secondary sintering at a certain temperature to form into product Li(CoxNiyMnzAlaMgbTicCrd)02-kLiCo02. Its advantages include low cost, high charge capacity, excellent safety performance and stability.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery positive electrode material, and further refers to a method for preparing a lithium battery positive electrode material doped with various elements by chemical deposition. Background technique [0002] At present, the commercial lithium-ion battery cathode material is mainly layered LiCoO 2 . But it has several problems: (1) The high price due to the lack of cobalt resources forces people to look for alternative materials with low price and good performance; (2) LiCoO 2 The development limitation of material energy density (there is no major breakthrough in several years after the development to 140mAh / g) makes it more and more difficult to meet the needs of the ever-changing electronic industry; (3) poor safety performance and high temperature performance, not suitable for manufacturing Make high-capacity batteries. [0003] Therefore, the development of some positive electrode mate...

Claims

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Application Information

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IPC IPC(8): C01G1/00C01G1/02H01M4/04H01M4/505H01M4/525
CPCY02E60/10
Inventor 许文湘
Owner CHONGQING TERUI BATTERY MATERIAL
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