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A kind of lithium ion battery cathode material precursor and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of lithium ion battery positive electrode material precursors and their preparation, can solve problems such as the inability to meet the requirements for safe use of lithium ion batteries, achieves safety and cyclability, and facilitates large-scale production. , the effect of high charge and discharge capacity

Active Publication Date: 2021-06-22
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] By analyzing the content of the above patents, it can be found that the high-entropy material still cannot meet the safe use requirements of lithium-ion batteries

Method used

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Effect test

preparation example Construction

[0036] The preparation method of lithium ion battery cathode material precursor of the present invention comprises the following steps:

[0037] (1) Prepare battery-grade soluble nickel salt, soluble cobalt salt, and soluble manganese salt transparent solution in a certain proportion in beaker a, and prepare equimolar amounts of soluble nickel salt, soluble cobalt salt, soluble manganese salt, soluble magnesium salt, and soluble Titanium salt transparent solution in beaker b; the soluble nickel salt, soluble cobalt salt, soluble manganese salt transparent solution in beaker a soluble nickel salt: (soluble cobalt salt + soluble manganese salt) molar ratio = 6 ~ 9: 4 ~ 1; the total molar concentration of the three salts in the beaker a is 1-6 mol / L; preferably 2-4 mol / L; the total molar mass of the three salts in the beaker a: the total molar mass of the five salts in the beaker b=7 ~9:3~1.

[0038] (2) Add the beaker b solution, ammonia water, and lye into the reactor to stir ...

Embodiment 1

[0042] (1) Weigh 6 mol nickel sulfate, 2 mol cobalt sulfate, 2 mol manganese sulfate transparent solution in beaker a, the total volume is 10L, then weigh 0.85 mol nickel sulfate, 0.85 mol cobalt sulfate, 0.85 mol manganese sulfate, 0.85 mol Magnesium sulfate, 0.85mol titanyl sulfate transparent solution in beaker b, the volume is 4.25L;

[0043] (2) Add the beaker b solution, 1mol / L ammonia water 2.85L, and 10mol / L sodium hydroxide solution into a 30L reactor to stir and react. The reaction temperature is 40°C, and the pH of the reaction is controlled to be 12.5. Add 5% of the beaker b solution and stop. Feed, and add 14.7g glutamic acid, feed N 2 , the flow rate is 12L / min, continue stirring for half an hour;

[0044] (3) Continue to add the beaker a solution, 1mol / L ammonia water, and 10mol / L sodium hydroxide solution into the reactor in step (2), and continue to feed N 2 , the flow rate is 12L / min, and the pH of the reaction is controlled to be 10.5, until the addition o...

Embodiment 2

[0047] (1) Weigh 7 mol nickel sulfate, 2 mol cobalt sulfate, 1 mol manganese sulfate transparent solution in beaker a, the total volume is 2L, then weigh 0.5 mol nickel sulfate, 0.5 mol cobalt sulfate, 0.5 mol manganese sulfate, 0.5 mol Magnesium sulfate, 0.5mol titanyl sulfate transparent solution in beaker b, the volume is 0.5L;

[0048] (2) Add the beaker b solution, 5mol / L ammonia water 2.0L, and 2mol / L sodium carbonate solution into a 30L reactor to stir and react. The reaction temperature is 90°C, and the pH of the reaction is controlled to remain unchanged at 11.0. After adding 10% of the beaker b solution, Stop feeding, and add 73.5g glutamic acid, feed N 2 , the flow rate is 30L / min, continue stirring for half an hour;

[0049] (3) Continue to add the beaker a solution, 5mol / L ammonia water, and 2mol / L sodium carbonate solution into the reactor in step (2), and continue to feed N 2 , the flow rate is 30L / min, and the pH of the reaction is controlled to be 11.5, unti...

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Abstract

The invention discloses a lithium ion battery cathode material precursor and a preparation method thereof, belonging to the technical field of battery materials. The lithium-ion battery material precursor is sequentially composed of nickel-cobalt-manganese-magnesium-titanium high-entropy oxide-high-nickel-nickel-cobalt-manganese oxide-nickel-cobalt-manganese-magnesium-titanium high-entropy oxide from the outer layer to the inner layer. The battery material uses high-entropy materials as crystal nuclei and surface coatings to effectively solve the safety problem of high-nickel ternary materials, improve the stability and cycleability of battery materials, and have a high charge and discharge gram capacity, reaching the top level in the industry. equal level. The technical solution has simple preparation process, low production cost and is suitable for industrialization.

Description

technical field [0001] The invention belongs to the field of high-entropy battery materials, and in particular relates to a lithium-ion battery cathode material precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect. They are currently the research and application hotspots in the energy industry. The ternary nickel-cobalt lithium manganese oxide cathode material is gradually favored by the market due to its high energy density, good cycle performance, stable working voltage and simple preparation process, and its market share continues to rise. Especially in the field of power batteries, it has been considered as the most promising new cathode material for lithium batteries, and has been successfully applied in the field of electric vehicles, such as Tesla in the United States, Honda in J...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李晓祥裴晓东骆艳华鲍维东刘晨佘世杰张倩倩
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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