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A kind of coating modification method of positive electrode material of lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, non-aqueous electrolyte batteries, and electrolyte battery manufacturing, etc., can solve problems such as poor compatibility and increase the complexity of the operation process, and achieve easy reaction, good protection, high The effect of applying value

Active Publication Date: 2017-08-08
山东碲金新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, these heterogeneous substances are inactive substances, which will have a negative impact on the capacity of the battery; on the other hand, from the perspective of material synthesis, the compatibility between heterogeneous materials is poor. In addition, the precursors used in the synthesis of heterogeneous materials The process conditions such as preparation method, sintering temperature and reaction time are different, thus increasing the complexity of the operation process

Method used

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  • A kind of coating modification method of positive electrode material of lithium ion battery
  • A kind of coating modification method of positive electrode material of lithium ion battery
  • A kind of coating modification method of positive electrode material of lithium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh lithium acetate dihydrate and manganese acetate tetrahydrate according to the stoichiometric ratio, place them in a mortar and mix them evenly at room temperature (25°C), then add 2wt% dispersant ethanol and mix them evenly, dry them and place them in a muffle Heating to 750°C at a heating rate of 5°C / min in the furnace, and then cooling to room temperature (25°C) naturally after holding for 10 hours, to obtain the matrix lithium manganate material;

[0020] (2) take by weighing lithium acetate dihydrate and manganese acetate tetrahydrate according to the stoichiometric ratio (the total weight taken is 1.5% of the sum of lithium acetate dihydrate and manganese acetate tetrahydrate of raw materials in step (1), add step The matrix lithium manganate material obtained in (1) is then added with 2wt% dispersant ethanol and mixed evenly. After drying, it is placed in a muffle furnace and heated to 750° C. at a heating rate of 5° C. / min. After 10 hours of heat preserv...

Embodiment 2

[0023] (1) Take cobalt nitrate hexahydrate and lithium hydroxide monohydrate according to the stoichiometric ratio, put them in a mortar and mix them evenly at room temperature (25°C), then add 2wt% of dispersant acetone and mix them evenly, dry them and put them in a horse Heating to 600°C at a heating rate of 5°C / min in the Furnace, keeping the temperature for 10 hours and then cooling to room temperature (25°C) naturally to obtain the matrix lithium cobaltate material;

[0024] (2) take by weighing cobalt nitrate hexahydrate and lithium hydroxide monohydrate (the gross weight that takes is 0.3% of the sum of raw material cobalt nitrate hexahydrate and lithium hydroxide monohydrate in step (1)) according to stoichiometric ratio, then Add the matrix lithium cobalt oxide material obtained in step (1), then add 2wt% dispersant acetone and mix evenly, after drying, place in a muffle furnace and heat to 600°C at a heating rate of 5°C / min, and keep it warm for 10 hours Cool natura...

Embodiment 3

[0026] (1) Take lithium carbonate, ferrous oxalate dihydrate and ammonium dihydrogen phosphate according to the stoichiometric ratio, put them in a mortar and mix them evenly at room temperature (25°C), then add 2wt% dispersant polyethylene glycol and mix them evenly , after drying, place it in a muffle furnace and heat it to 700°C at a heating rate of 5°C / min, keep it warm for 12 hours and then cool it down to room temperature (25°C) naturally to obtain the matrix lithium iron phosphate material;

[0027] (2) take lithium carbonate, ferrous oxalate dihydrate and ammonium dihydrogen phosphate according to the stoichiometric ratio (the total weight taken is the sum of lithium carbonate, ferrous oxalate dihydrate and ammonium dihydrogen phosphate in the step (1) 0.1%), then add the matrix lithium iron phosphate material obtained in step (1), then add 2wt% dispersant polyethylene glycol and mix evenly, dry and place in a muffle furnace with a temperature increase of 5°C / min Heati...

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Abstract

The invention belongs to the field of electrode materials, and particularly relates to a modification method of a common cathode material in lithium ion batteries. In the modification method, a coating layer and a matrix have the same composition and structure. The modification method comprises the following steps: at first, synthesizing a matrix material; then uniformly mixing the synthesized matrix material with a dispersing agent and raw materials necessary for synthesizing the matrix material, evaporating the dispersing agent, and sintering to obtain a coated cathode material. Since the coated substance is the same as the matrix, the process is simple, the cost is low and the industrial application value is very high.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a method for modifying common cathode materials of lithium ion batteries. Background technique [0002] At present, the modification methods of positive electrode materials include metal ion doping, preparation of specific morphology, size reduction, surface coating, etc., all of which can improve the performance of the material, and the surface coating can improve the conductivity of the material and protect the matrix material. aspects play an important role and have received particular attention. [0003] The current coating method is generally to coat C and SiO on the surface of the substrate. 2 、Al 2 o 3 , ZnO, AlPO 4 and other heterogeneous substances. On the one hand, these heterogeneous substances are inactive substances, which will have a negative impact on the capacity of the battery; on the other hand, from the perspective of material synthesis, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/505H01M4/525
CPCH01M4/139H01M4/505H01M4/525H01M4/5825H01M10/058Y02E60/10
Inventor 张汉平杨涛吴欣杨超周贻森朱甜
Owner 山东碲金新能源科技有限公司