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Core-shell material

A core-shell and positive electrode material technology, applied in the field of electrode materials, can solve the problems of no electrochemical activity of coating material, inability to form a uniform coating layer, and small coating amount, so as to improve safety and storage stability, The effect of excellent long-term cycle stability and huge market space

Active Publication Date: 2019-03-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, most of the coating methods are for the treatment of the sintered material. Since the coating process usually requires the sintered ternary material to be treated in water or an organic solvent, secondary calcination is required, and it is inevitable during the calcination process A local spinel phase will be generated, which will cause a decrease in material capacity, poor cycle, gas production, and increase battery safety hazards
In addition, the current coating method has a small amount of coating and cannot form a uniform coating layer, and the material of the coating layer is not electrochemically active and cannot have the ability to deintercalate lithium ions, which will affect the electrochemical performance of the positive electrode material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Embodiment 1 Shell is the core-shell material of amorphous phase

[0129] Prepare a mixed solution according to the molar ratio of Ni, Co, and Mn of 1:1:1, weigh 87.61g, 93.72g, and 56.34g of nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate, respectively, and add 500mL of water to dissolve. Prepare 1000mL 4mol / L NaOH solution and 1000mL 2mol / L ammonia solution.

[0130] In the nitrogen-protected reactor, add 200mL of water, and add the mixed solution, 4mol / L NaOH solution and 2mol / L ammonia solution into the reactor at the same time, and the final pH value of the solution is controlled at 11. After the precipitation, the precipitate was filtered and washed, and dried at 80°C to obtain the precursor P1.

[0131] Weigh 50g of precursor P1, add 200mL of water, and stir to form a dispersion. Prepare 1mol / L ammonia solution. Weigh 11.42g Zr(SO 4 ) 2 4H 2 O, add 30mL water to dissolve.

[0132] Zr(SO 4 ) 2 Add the solution to...

Embodiment 2

[0134] Embodiment 2 Shell is the core-shell material of crystalline phase

[0135] Prepare a mixed solution according to the molar ratio of Ni, Co, and Mn of 1:1:1, weigh 87.61g, 93.72g, and 56.34g of nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate, respectively, and add 500mL of water to dissolve. Prepare 1000mL 4mol / L NaOH solution and 1000mL 2mol / L ammonia solution.

[0136] In the nitrogen-protected reactor, add 200mL of water, and add the mixed solution, 4mol / L NaOH solution and 2mol / L ammonia solution into the reactor at the same time, and the final pH value of the solution is controlled at 11. After the precipitation, the precipitate was filtered and washed, and dried at 80°C to obtain the precursor P1.

[0137] Weigh 50g of precursor P1, add 200mL of water, and stir to form a dispersion. Prepare 1mol / L ammonia solution. Weigh 14.67g Co(CH 3 COO) 2 4H 2 O, add 60mL water to dissolve.

[0138] Co(CH 3 COO) 2 Add the sol...

Embodiment 3

[0140] Embodiment 3 shell is the core-shell material of crystalline phase and amorphous phase

[0141] Weigh the precursor P4 50g in Example 1, add 200mL water, stir to form a dispersion; weigh 13.03g Co(CH 3 COO) 2 4H 2 O, dissolved in 30mL of water. Prepare 4mol / L LiOH solution and 1mol / L ammonia solution.

[0142] Co(CH 3 COO) 2 Solution and 4mol / L LiOH and ammonia solution were added to the dispersion of precursor P4 at the same time, and the Co(OH) 2 It settles on the surface of precursor P4, and the pH value of the precipitation is controlled at 12. The composite precursor P6 was obtained after filtering, washing with water, and drying at 100°C.

[0143] Weigh 50g of the above-mentioned P6 precursor, mix the lithium salt and the precursor at a molar ratio of 1.1:1, weigh LiOH·H 2 O 24.52g, mixed with precursor P6 evenly, sintered at 500°C for 6 hours, then sintered at 950°C for 12 hours, the core is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the shell is crystal phase LiCoO ...

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Abstract

The invention discloses a core-shell material. A core material of the core-shell material is selected from at least one of compounds having the molecular formulae as shown in formula (I) and formula (II); and the core-shell material is prepared by a method of a multilayer precursor. The core-shell material is applied to the field of a lithium ion battery as a positive electrode material, and has good air stability and safety performance while the high capacity advantage is exerted.

Description

technical field [0001] The application relates to a core-shell material, which belongs to the field of electrode materials. Background technique [0002] The depletion of traditional energy sources has led to more and more attention being paid to the development and utilization of new energy sources. As a new green energy source, lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, low self-discharge efficiency, no memory effect, and good safety. They have been widely used in electronic products and power vehicle batteries and other fields. At present, the challenges faced by vehicle-mounted lithium-ion batteries are, on the one hand, to increase the cruising range while ensuring safety, and on the other hand, to reduce costs. The positive electrode material is an important part of the lithium-ion battery that determines the energy density of the lithium-ion battery. By increasing the capacity of the positive electrode material, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M4/36Y02E60/10
Inventor 毕玉敬刘孟姜阳秦银平王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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