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A silicon-based negative electrode material and its preparation method and a lithium-ion battery

A silicon-based negative electrode material and silicon-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity, poor capacity retention rate, not ideal, etc., achieve high capacity, low production cost, good The effect of cycle performance

Active Publication Date: 2021-11-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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Problems solved by technology

Patent CN 108493438A discloses a SiOx-based composite negative electrode material for lithium-ion batteries and its preparation method, which mainly covers silicate and carbon layers on the silicon-based substrate. Although its first effect and capacity have been improved, it is still not enough Too ideal, the first effect is only 77.3%, and the capacity retention rate is poor
Patent CN 110615423A discloses a preparation method of a silicon-based composite negative electrode material for a lithium battery, which is to directly form a silicate with a metal salt to form a silicate compound when producing silicon oxide, but the lower capacity also limits its application

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  • A silicon-based negative electrode material and its preparation method and a lithium-ion battery
  • A silicon-based negative electrode material and its preparation method and a lithium-ion battery
  • A silicon-based negative electrode material and its preparation method and a lithium-ion battery

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preparation example Construction

[0059] The present invention also provides a method for preparing the above-mentioned silicon-based negative electrode material, comprising the following steps:

[0060] After mixing the iron-containing compound with the silicon-based matrix, sintering is performed to obtain a composite containing a ferrous silicate film coating layer;

[0061] An outer cladding layer is coated on the surface of the composite, and the outer cladding layer is a single-layer or multi-layer structure prepared from one or more of carbon source and lithium source materials.

[0062] Specifically, the present invention first mixes the iron-containing compound with the silicon-based matrix to obtain a mixture.

[0063] Wherein, the iron-containing compound is selected from one or more of ferric sulfate, ferrous sulfate, ferric citrate, ferric nitrate, ferrous citrate, ferrous nitrate, ferric acetate, ferrous acetate, ferric oxide, ferrocene various;

[0064] The silicon-based matrix is ​​selected f...

Embodiment 1

[0122] Dissolve 4g of ferric sulfate in 400ml of deionized water, then add 20g of silicon oxide (SiO X , particle size 2-10 μm), magnetically stirred for 6 h, and then the solution was spray-dried. Put the spray-dried powder into a tube furnace, raise the temperature to 800°C at a rate of 5°C / min, and keep it warm for 3 hours to obtain Material 1.

[0123] Carry out scanning electron microscope observation and XRD detection to material 1, the result sees figure 1 and figure 2 , figure 1 It is the field emission scanning electron microscope figure of embodiment 1; figure 2 It is the XRD test figure of embodiment 1.

[0124] Depend on figure 1 and figure 2 It can be seen that figure 1 It is the SEM figure of Example 1, from which it can be observed that the ferrous silicate film-coated silicon oxide matrix is ​​spherically agglomerated together, which is due to the formation of secondary granulation of spray drying, and the overall secondary particle is The diameter o...

Embodiment 2

[0128] Mix 4g ferric citrate with 20g silicon oxide (SiO X , particle size 2 ~ 10μm) mixed ball milling, ball milling at a speed of 400r / min for 6h to obtain the precursor, then put it into a tube furnace, raise the temperature to 900°C at a rate of 5°C / min, and keep it for 2h, Get material two.

[0129] Mix the obtained material two with conductive carbon black, CMC and SBR according to the mass ratio of 53:24:7:16, the solvent is deionized water, the beating time is 12h, and the beaten slurry is evenly coated on the copper On the foil, blow dry at 80°C for 12 hours, cut the sheet first, and then roll to obtain the negative electrode sheet. The lithium sheet is used as the counter electrode, and the electrolyte is LiPF 6 / DMC:EMC:EC=1:1:1(V / V / V), the separator is 2400 polyethylene microporous membrane, assembled into a button-type simulated battery. Test after standing for 5 hours.

[0130] The simulated battery adopts the blue electric battery system for charge and discha...

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Abstract

The invention provides a silicon-based negative electrode material, comprising a silicon-based substrate, a ferrous silicate film and an outer coating layer coated on the surface of the silicon-based substrate in sequence, and the outer coating layer is made of a carbon source A single-layer or multi-layer structure prepared by one or more of lithium source materials. In the present invention, the iron-containing compound is used to coat the silicon base first, and then to coat the silicon base twice or more times. Silicon-based materials, especially silicon oxide, have a high capacity as a negative electrode material, but the first effect is low and the cycle is poor. By coating the silicon-based substrate with an iron-containing compound, a layer is first formed on the surface of the substrate. Dense ferrous silicate film, this film can improve the first effect of the silicon-based substrate, and the ferrous silicate film has higher capacity and better cycle performance than other silicate films, and then By coating the carbon layer or lithiated layer, the cycle performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-based negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Nowadays, due to environmental pollution and energy problems, we need to develop new energy sources to replace fossil energy sources. Lithium-ion batteries have been widely used in mobile phones, notebook computers, and new energy vehicles due to their high volumetric energy density and no memory effect. The negative electrode material is a key part of lithium-ion batteries. The commercial negative electrode materials are still mainly graphite negative electrodes, but graphite negative electrodes cannot meet the needs of high energy density lithium-ion batteries due to their low specific capacity. Alloy-type negative electrode materials have attracted much attention because of their high specific capacity, such as the theore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 王益刘兆平季晶晶查晓娟傅浩
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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