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Multi-component composite silica negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery, multi-component composite technology, used in battery electrodes, electrical components, secondary batteries, etc.

Pending Publication Date: 2020-06-26
洛阳联创锂能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies in the background technology, the present invention provides a multi-element composite silicon-oxygen negative electrode material for lithium ion batteries and a preparation method thereof. The present invention is based on the working principle of lithium ion secondary batteries, and the negative electrode material effectively consumes lithium materials after the battery is formed. The process is advanced to the pre-completion in the material manufacturing process, so as to achieve the first-time high efficiency and long cycle life of the negative electrode material, etc.

Method used

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  • Multi-component composite silica negative electrode material for lithium ion battery and preparation method thereof
  • Multi-component composite silica negative electrode material for lithium ion battery and preparation method thereof
  • Multi-component composite silica negative electrode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0032] A preparation method of a multi-element composite silicon-oxygen anode material for lithium ion batteries, the preparation method specifically includes the following steps:

[0033] The first step is to first use silicon oxide powder with a carbon coating on the surface, mix it with the lithium source powder uniformly under the protection of a non-oxidizing atmosphere, and then heat the mixture to 350-750°C and heat it for 2-24 hours. After cooling to room temperature, a basic powder is obtained; the silicon oxide powder body with a carbon coating layer on the surface is a composite powder obtained by co-deposition of silicon oxide and carbon or a silicon oxide powder body is made and then passed through a carbon coating Coated powder; the carbon source for the coated carbon can be any one of sucrose, glucose, citric acid, pitch, furfuryl alcohol resin, phenolic resin, polyethylene, polystyrene, polypropylene, methane, propane, and acetylene Or a combination of two or more...

specific Embodiment

[0045] The invention adopts ICP-AES as the analysis means of material composition, and adopts the high-frequency induction carbon-sulfur analyzer as the analysis means of carbon content. Using the materials obtained in the examples and comparative examples, coin-type secondary batteries were produced to evaluate the usability of the materials.

[0046] First, prepare a silicon oxide powder with a carbon coating layer. Take commercially available silica powder with silicon-oxygen atom molar ratio of 1:1, particle size D50 of 6 microns, high-temperature petroleum pitch powder as carbon coating agent, and mechanically mix the two powders with a high-mixer in an appropriate ratio Then, put it into a vacuum heating furnace and heat it to 800 degrees Celsius for 2 hours, cool to room temperature, and then be broken up and sieved for use. Using this method, three basic powders with carbon content of 2.5%, 5.2%, and 7.6% were obtained.

Embodiment 1

[0048] Take 100g of the basic powder with a carbon content of 2.5% and 10g of Li3N powder, mix them evenly in an argon protective box; then place them in an argon atmosphere for heat treatment at 500 degrees for 12h, and cool to room temperature naturally. Add 0.2g of lithium hydroxide, 0.7g of lanthanum hydroxide, and 0.9g of zirconium acetate to 100g of the above powders, and disperse them at a high speed to uniformly fuse them; then place them in an argon atmosphere for heat treatment at 600°C for 1h, and cool to room temperature naturally. Break up and screen to get the finished product.

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Abstract

The invention discloses a multi-component composite silica negative electrode material for a lithium ion battery and a preparation method thereof, and relates to the technical field of new material. The negative electrode material comprises six elements of Si, O, Li, C, La and Zr, the negative electrode material comprises a plurality of particle units, and each particle unit is of a core-shell structure. According to the working principle of a lithium ion secondary battery, the process of ineffectively consuming the lithium material by the negative electrode material after the battery is formed is advanced to be completed in advance in the material manufacturing process, so that the demand characteristic of high initial efficiency and long cycle life of the negative electrode material is achieved, and meanwhile, the amount of ineffectively consumed lithium during charging and discharging after the battery is manufactured is reduced, the reaction that the negative electrode material reacts with the liquid electrolyte to generate the solid electrolyte after the battery is prepared is weakened, and the amount of lithium consumed for forming a solid electrolyte membrane due to the reaction is reduced, and accordingly the purposes of improving the initial efficiency and prolonging the cycle life can be achieved.

Description

Technical field [0001] The invention relates to the technical field of new materials, in particular to a multi-element composite silicon-oxygen negative electrode material and a preparation method thereof, in particular to a multi-element composite silicon-oxygen negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] It is known that with the rapid popularity of portable electrical products such as mobile phones, notebook computers, and tablet computers, the market demand for high-energy density rechargeable batteries has also increased, so the demand for lithium-ion secondary batteries has exploded. increase. At the same time, with the rapid development of electric vehicles, especially electric vehicles in recent years, the demand for lithium-ion secondary batteries has further increased. In practical applications, the application side requires lithium-ion secondary batteries to have the characteristics of high ener...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525H01M10/0562
CPCH01M4/366H01M4/62H01M4/483H01M10/0562H01M10/0525H01M4/624H01M4/625Y02E60/10
Inventor 陈志强高贵华王孟光贺霄飞
Owner 洛阳联创锂能科技有限公司
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