Lithium silicon oxide particle, preparation method thereof, negative electrode material, pole piece and battery

A technology of lithium particles and silicon oxygen, applied in the fields of silicon oxide lithium particles and their preparation, anode materials, pole pieces and batteries, can solve the problems of limiting the improvement of battery energy density, low first coulomb efficiency, etc., to reduce battery polarization , Improve the rate performance, the effect of good water resistance

Active Publication Date: 2021-04-20
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide compounds generate materials such as lithium silicate and lithium oxide when charging for the first time in a lithium-ion battery, and the lithium ions in the material cannot be released during discharge, resulting in a low initial Coulombic efficiency of the battery (theoretical efficiency is about 70% ), thus limiting the improvement of the energy density of the full battery

Method used

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  • Lithium silicon oxide particle, preparation method thereof, negative electrode material, pole piece and battery
  • Lithium silicon oxide particle, preparation method thereof, negative electrode material, pole piece and battery
  • Lithium silicon oxide particle, preparation method thereof, negative electrode material, pole piece and battery

Examples

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preparation example Construction

[0050] [Preparation method of silicon oxide lithium particles]

[0051] image 3 It is a flowchart of a method for preparing silicon oxide lithium particles according to an exemplary embodiment of the present application.

[0052] The specific process of preparing silicon oxide particles can be carried out by the following steps. First, the mixture of metal silicon powder and silicon dioxide powder is heated in the temperature range of 900° C. to 1600° C. in an inert gas atmosphere or under reduced pressure to generate silicon oxide gas. The gas will be deposited on the adsorption plate. When the temperature in the reaction furnace is lowered to below 100°C, the sediment is taken out, crushed and pulverized by equipment such as a ball mill, jet mill, etc., to obtain silicon oxide compound particles for future use.

[0053] see image 3 , in S301, performing surface treatment on the silicon oxide particles. According to an exemplary embodiment, the surface treatment includ...

Embodiment 1

[0079] Take silicon oxide particle powder (D50=5μm, SPAN=1.3, y=1 in the general formula of SiOy) and place it in the air (25°C) with a relative humidity of about 100%, heat it to 600°C and keep it for 60 minutes for surface treatment, Silica particles with an oxygen-enriched shell are obtained.

[0080] Add 2 kg of the above-mentioned surface-treated silicon-oxygen particle powder and 120 g of petroleum pitch powder into the VC mixer, and mix for 30 minutes at a speed of 8 m / s at the maximum diameter of the stirring part, so that the two raw materials are mixed evenly.

[0081] The above mixture was put into a graphite crucible, placed in a box furnace, fed with nitrogen protective gas, heated to 1000°C at a rate of 3°C / min, kept for 4h, and then naturally cooled to room temperature to complete the heat treatment. In this step, the pitch is carbonized under high-temperature treatment in an oxygen-free atmosphere to obtain a conductive carbon layer, and at the same time, it wi...

Embodiment 2

[0089] Take silicon oxide particle powder (D50=5μm, SPAN=1.3, y=1 in SiOy general formula) and put it in 20wt% hydrogen peroxide at a temperature of 50°C, keep stirring for 4 hours, then cool to room temperature, filter and dry.

[0090] The same is true for the mixing and heat treatment of the surface-treated silicon-oxygen particle powder and the carbon precursor in the above-mentioned embodiments, and the composite material obtained after the heat treatment is dispersed into a fine powder.

[0091] In the same manner as in Example 1, the silicon-oxygen particle powder was subjected to liquid-phase lithium intercalation treatment. Finally, after sieving and demagnetization treatment, the final product that can be used as negative electrode material is obtained.

[0092] In the same way as the test method of the above example, the measured particle size D50 of lithium silicon oxide particles in Example 2 is 6.3 μm, SPAN=1.40, and the specific surface area is 3.1 m 2 / g, the ...

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Abstract

The present invention provides a lithium silicon oxide particle having a core-shell structure. The lithium silicon oxide particle comprises: an inner core particle comprising a lithium silicate compound matrix and an elemental silicon nanoparticle, wherein the molar ratio of lithium element/silicon element in the inner core particle is X, the molar ratio of oxygen element/silicon element is Y, 0.1 < = X < 2, and 0.5 < = Y < = 1.5; a silicon carbide shell layer which coats the inner core particle; and a conductive carbon layer, wherein the silicon carbide shell layer is coated with the conductive carbon layer. The lithium silicon oxide particle has the characteristics of good water resistance, low expansion rate, long cycle life, high coulombic efficiency and the like.

Description

technical field [0001] This application relates to the field of batteries, in particular to silicon oxide lithium particles with a core-shell structure and its preparation method, negative electrode material, pole piece and battery Background technique [0002] Due to the rapid development and wide application of various portable electronic devices, electric vehicles, and energy storage systems in recent years, the demand for lithium-ion batteries with high energy density and long cycle life has become increasingly urgent. At present, the anode material of commercial lithium-ion batteries is mainly graphite, but due to the low theoretical capacity, the further improvement of the energy density of lithium-ion batteries is limited. Since the silicon anode material has the advantage of high capacity that other anode materials cannot match, it has become a research and development hotspot in recent years, and has gradually moved from laboratory research to commercial application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 李喆张和宝罗姝查道松王岑
Owner BERZELIUS (NANJING) CO LTD
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