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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of not being able to effectively utilize the advantages of the composite of negative electrode materials and silicon oxide materials, high-capacity negative electrode materials volume expansion batteries, Particles are easy to pulverize and break, and achieve the effects of industrialized large-scale production, simple and efficient preparation methods, and high energy density

Active Publication Date: 2021-01-15
JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the volume expansion rate of less than 10% of traditional graphite, the serious volume expansion of high-capacity anode materials has brought new problems to the battery.
At present, batch-produced carbon-coated silicon oxide materials are usually mixed with other negative electrode materials to increase the energy density of lithium-ion batteries. The particles are easily powdered and broken, the battery capacity decays rapidly, and the advantages of the composite of negative electrode materials and silicon oxide materials cannot be effectively utilized

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Step (1) According to the mass ratio of silicon oxide and flake graphite at 0.1:1, take 1 kg of silicon oxide and 10 kg of flake graphite and add them to the vacuum reaction chamber and the rotary collection chamber respectively. At 200°C, Ar:H 2 The flake graphite was pretreated at 200°C with a volume ratio of 7:3.

[0060] Step (2) heating to 1360° C. under the condition of vacuum degree of 60 Pa, keeping the temperature for 5 hours, and the silicon oxide powder is sublimated under the condition of high temperature and vacuum. At the same time, heat the rotary collection chamber to 800°C and keep it warm. Silicon oxide vapor enters the rotary collection chamber and deposits on the surface of flake graphite.

[0061] In the rotary chamber, at 10L / min, keep 300°C, and pass through ammonia gas for 50min.

[0062] Step (3) After cooling down, nitrogen with a flow rate of 20L / min is introduced into the rotary collection chamber and the temperature is raised to 975°C; th...

Embodiment 2

[0065] According to the same method as in Example 1, the lithium ion battery negative electrode material of the present invention is prepared, the difference is: according to step (1) SiO2 and pretreated phosphorus flake graphite with a mass ratio of 0.2:1, respectively get 2kg oxidation Sub-silicon and 10kg flake graphite were added separately. The thickness of the carbon coating layer is 20nm, and the thickness of the silicon oxide coating layer is 300nm.

Embodiment 3

[0067] According to the same method as in Example 1, the lithium-ion battery negative electrode material of the present invention is prepared, the difference is: after cooling and cooling according to the step (3), nitrogen gas with a flow rate of 20 L / min is introduced into the rotary collection bin and the temperature is raised. to 975°C. Feed acetylene with a flow rate of 10L / min to crack it at high temperature, and coat the material in the rotary collection bin with pyrolytic carbon for 1.5 hours. The thickness of the carbon coating layer is 10 nm, and the thickness of the silicon oxide coating layer is 200 nm.

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Abstract

The invention relates to a lithium ion battery negative electrode material and a preparation method thereof. The lithium ion battery negative electrode material has a three-layer core-shell structureand is composed of an inner core material, a silicon monoxide middle layer and a carbon-coated outer layer. The surface of the inner core material is pretreated in a non-oxidizing atmosphere, and a specific temperature gradient is formed by heating and silicon monoxide steam so that a nano silicon monoxide layer is deposited on the surface. By adjusting the thicknesses of an element-doped carbon coating layer and a silicon monoxide deposition layer, the lithium ion battery negative electrode material with high electronic conductivity, low volume expansion and excellent cycle performance and rate capability is obtained. The preparation method comprises the following steps: 1) putting a material capable of generating the silicon monoxide steam into a reaction bin, putting the inner core material into a rotary collection bin, vacuumizing, and heating; 2) carrying out vapor deposition of silicon monoxide to the surface of the inner core material; and 3) after cooling, carrying out carbon coating on the material in the collection bin.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, with the excessive exploitation and utilization of non-renewable energy, the problems of energy shortage and environmental pollution have become more and more serious. The application of lithium-ion battery technology with high energy density, long cycle life and environmental friendliness is an effective way to alleviate energy and environmental problems. [0003] Lithium-ion batteries have been widely used in power batteries, portable devices and large-scale energy storage. Most commercial lithium batteries use graphite system as the negative electrode. Due to the low theoretical lithium storage capacity of the graphite negative electrode itself, the development of lithium batteries in the direction of high specific energy is limited....

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525C01B32/21C01B33/113
CPCH01M4/366H01M4/483H01M4/587H01M4/625H01M4/628H01M10/0525C01B33/113C01B32/21H01M2004/021H01M2004/027Y02E60/10
Inventor 徐泉刘柱李阁闫明妍程晓彦赵岸光
Owner JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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