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Method for reducing surface tension of molten-state lithium source so as to improve high-temperature solid phase sintering process of cathode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of uneven distribution of lithium sources, insufficient reaction, unbalanced reaction, etc., and achieve low lithium-nickel mixing degree, Improving the effect of wetting and the effect of complete solid-state reaction at high temperature

Active Publication Date: 2016-07-20
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of unbalanced and insufficient reaction caused by uneven distribution of molten lithium source and incomplete infiltration during the high-temperature solid-state sintering process of lithium-ion battery positive electrode materials, thereby improving the charge-discharge cycle process The rate performance, cycle stability and thermal stability of the materials in the middle of the problem provide a method to reduce the surface tension of the molten lithium source and improve the high temperature solid-state sintering process of the positive electrode material of the lithium ion battery

Method used

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  • Method for reducing surface tension of molten-state lithium source so as to improve high-temperature solid phase sintering process of cathode material of lithium ion battery
  • Method for reducing surface tension of molten-state lithium source so as to improve high-temperature solid phase sintering process of cathode material of lithium ion battery
  • Method for reducing surface tension of molten-state lithium source so as to improve high-temperature solid phase sintering process of cathode material of lithium ion battery

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specific Embodiment approach 1

[0027] Embodiment 1: A method of reducing the surface tension of the molten lithium source in this embodiment to improve the high-temperature solid-state sintering process of the positive electrode material of the lithium-ion battery is carried out according to the following steps:

[0028] 1. Lithium source pretreatment: mix lithium source and phosphate according to the molar ratio of 1:(0.005~0.2) and stir for 10min~120min to obtain solid mixture 1; transfer solid mixture 1 to a ball mill tank and ball mill for 1h~20h to obtain solid mixture 2;

[0029] 2. Mix the lithium source and the precursor material of the positive electrode material of the lithium ion battery: mix the solid mixture 2 obtained in step 1 with the precursor material of the positive electrode material of the lithium ion battery at a molar ratio of 1: (1 to 1.2) and stir for 10 minutes ~60min to obtain solid mixture 3;

[0030] 3. Fully infiltrate the lithium source and the precursor material: transfer the ...

specific Embodiment approach 2

[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the phosphate described in step one is potassium dihydrogen phosphate phosphate, dipotassium hydrogen phosphate phosphate, sodium dihydrogen phosphate phosphate, disodium hydrogen phosphate phosphoric acid Salt, Sodium Phosphate Phosphate, Sodium Pyrophosphate Phosphate, Sodium Pyrophosphate Phosphate, Diammonium Phosphate Phosphate, Monoammonium Phosphate Phosphate, Calcium Phosphate Phosphate, Calcium Phosphate Phosphate, Calcium Pyrophosphate Phosphate Salt, sodium aluminum phosphate phosphate, iron phosphate phosphate, iron pyrophosphate phosphate, magnesium hydrogen phosphate phosphate, magnesium phosphate phosphate, manganese hypophosphite phosphate or a mixture of more. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the lithium source described in step one is lithium hydroxide, lithium carbonate, lithium nitrate, lithium acetate, lithium sulfate, lithium chloride, lithium fluoride, lithium oxalate , lithium phosphate, lithium hydrogen phosphate or a mixture of one or more. Other steps and parameters are the same as those in the first embodiment.

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Abstract

The invention discloses a method for reducing surface tension of a molten-state lithium source so as to improve a high-temperature solid phase sintering process of a cathode material of a lithium ion battery, relating to a method for improving the high-temperature solid phase sintering process of the cathode material of the lithium ion battery and belonging to the technical field of a lithium ion battery material and a fabrication process thereof. The invention aims to solve the problems of unbalanced reaction and inadequate reaction caused by non-uniform molten-state lithium source distribution and incomplete immersion during the high-temperature solid phase sintering process of the cathode material of the lithium ion battery so that the problems such as rate performance, cycle stability and thermal stability of the material during the charge-discharge cycle process are improved. The improvement process is achieved according to the following steps of 1, pre-processing the lithium source; 2, mixing the lithium source and a precursor material; 3, fully immersing the lithium source and the precursor material; and 4, carrying out high-temperature sintering. The material fabricated according to the method is used for the cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a method for improving the high-temperature solid-phase sintering process of lithium-ion battery cathode materials, and belongs to the technical field of lithium-ion battery materials and manufacturing processes thereof. Background technique [0002] With the rapid development of the global economy, people's demand for energy has also increased rapidly, and the reduction of traditional fossil energy (coal, oil, natural gas) and the deterioration of the earth's environment have become two major obstacles to human survival and development. The development of energy has become one of the hot research topics in various countries. As a device for mutual conversion of chemical energy and electrical energy, battery is an important medium for rational utilization of energy. Compared with traditional primary batteries and secondary batteries represented by lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 杜春雨徐星尹鸽平左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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