A kind of composite negative electrode material and preparation method and lithium ion battery

A technology for negative electrode materials and composites, which is applied in the field of composite negative electrode materials and preparation methods and lithium-ion batteries, can solve problems such as low cobalt content, achieve good processing performance, high electrical conductivity, and reduce production costs

Inactive Publication Date: 2021-11-16
四川佰思格新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Some researchers have proposed to coat nitrogen-doped carbon on the surface of cobalt ferrite nanoparticles to form cobalt ferrite-nitrogen-doped carbon composite negative electrode materials for power lithium-ion batteries. However, in recent years, the price of metal cobalt has been rising all the way. Therefore, in order to reduce lithium The preparation cost of negative electrode materials for ion batteries requires a solution with low cobalt content

Method used

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  • A kind of composite negative electrode material and preparation method and lithium ion battery
  • A kind of composite negative electrode material and preparation method and lithium ion battery
  • A kind of composite negative electrode material and preparation method and lithium ion battery

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preparation example Construction

[0045] Another object of the present invention is to provide a kind of preparation method of above-mentioned composite negative electrode material, see image 3 As shown, the method includes:

[0046] S1: weighing iron salt, cobalt salt, and zinc salt to obtain raw material salt;

[0047] S2: adding raw material salt into water and stirring to obtain solution A;

[0048] S3: adjusting the pH of the solution A to be alkaline, filtering, taking the precipitate, washing the precipitate until neutral, and drying to obtain a solid B;

[0049] S4: heating the solid B to 400-800° C. in an oxidizing atmosphere, and keeping it warm to obtain zinc-cobalt ferrite;

[0050] S5: pulverizing zinc-cobalt ferrite to obtain powder C;

[0051] S6: Add carbon source and powder C into a stirring heating kettle, heat to 500-900°C under inert atmosphere or nitrogen atmosphere, keep warm and stir to obtain powder D;

[0052] S7: performing the first refinement treatment on the powder D to obtain...

Embodiment 1

[0072] This embodiment provides a preparation method of a composite negative electrode material, the preparation method comprising:

[0073] S1: weighing iron chloride, cobalt chloride, and zinc chloride according to the molar ratio of iron element, cobalt element, and zinc element being 2:0.5:0.5 to obtain raw material salt;

[0074] S2: add 100g raw material salt into 1000g water, stir to obtain solution A;

[0075] S3: adjusting the pH of the solution A to be alkaline, filtering, taking the precipitate, washing the precipitate until neutral, and drying to obtain a solid B;

[0076] S4: heating the solid B to 400° C. under an oxygen atmosphere and keeping it warm for 0.5 hours to obtain zinc-cobalt ferrite;

[0077] S5: Grinding zinc-cobalt ferrite to a particle size of 50 nm to obtain powder C;

[0078] S6: Add 20g of sucrose and 40g of powder C into a stirring heating kettle, heat to 500°C under a nitrogen atmosphere, keep warm and stir for 0.5 hours to obtain powder D; ...

Embodiment 2

[0087] This embodiment provides a preparation method of a composite negative electrode material, the preparation method comprising:

[0088] S1: weighing iron chloride, cobalt chloride, and zinc chloride according to the molar ratio of iron element, cobalt element, and zinc element being 2:0.5:0.5 to obtain raw material salt;

[0089] S2: Add 100g of raw material salt into 3000g of water and stir to obtain solution A;

[0090] S3: adjusting the pH of the solution A to be alkaline, filtering, taking the precipitate, washing the precipitate until neutral, and drying to obtain a solid B;

[0091] S4: heating the solid B to 600° C. under an air atmosphere and keeping it warm for 2 hours to obtain zinc cobalt ferrite;

[0092] S5: Grinding zinc-cobalt ferrite to a particle size of 100 nm to obtain powder C;

[0093] S6: Add 120g of pitch and 40g of powder C into a stirring heating kettle, heat to 700°C under an argon atmosphere, keep warm and stir for 2 hours to obtain powder D; ...

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Abstract

The invention discloses a high-capacity composite negative electrode material, a preparation method and a lithium-ion battery, and relates to the technical field of lithium-ion batteries. The high-capacity composite negative electrode material includes graphite, a zinc-cobalt ferrite complex, and a first carbon coating layer wherein the graphite is the main material of the high-capacity composite negative electrode material; the zinc-cobalt ferrite composite includes a zinc-cobalt ferrite and a second carbon coating layer, and the second carbon coating layer is coated on The exterior of the zinc-cobalt ferrite; the first carbon coating layer is coated on the exterior of the graphite and the zinc-cobalt ferrite composite. The high-capacity composite negative electrode material provided by the present invention uses graphite as the main material and zinc-cobalt ferrite as the high-capacity provider, so that the high-capacity composite negative electrode material has high capacity, high first-time efficiency, and good cycle performance. The advantages of high conductivity, good electrolyte compatibility, low price and good processing performance meet the needs of lithium-ion batteries for negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite negative electrode material, a preparation method and a lithium ion battery. Background technique [0002] In recent years, the production and sales of electric vehicles have grown steadily, and the sales of computers, communications, and consumer electronics have risen steadily, which has led to the vigorous development of the entire lithium-ion battery industry. Although electric vehicles and electronic products have different performance requirements for lithium batteries, their requirements for high energy density are the same. [0003] In order to increase the energy density of lithium-ion batteries, it is necessary to start with the main materials such as positive electrode materials and negative electrode materials; for negative electrode materials, the theoretical capacity of traditional graphite negative electrode materials is only 372mAh / g, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62
CPCH01M4/364H01M4/525H01M4/625Y02E60/10
Inventor 不公告发明人
Owner 四川佰思格新能源有限公司
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