A silicon-based composite negative electrode material, a preparation method thereof and an energy storage device

A technology of silicon-based material and negative electrode material, applied in the direction of negative electrode, hybrid capacitor, hybrid capacitor electrode, etc., can solve the problems of poor cycle performance, failure, pulverization, etc., and achieve long cycle life, high capacity, and ensure integrity. Effect

Active Publication Date: 2019-01-01
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides a silicon-based composite negative electrode material, the coating layer of the silicon-based composite negative electrode material can effectively alleviate the volume expansion effect of the silicon-based material core, and has good electrical conductivity and ion conductivity , to solve the problems of pulverization, failure and poor cycle performance of existing silicon-based materials due to high expansion

Method used

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  • A silicon-based composite negative electrode material, a preparation method thereof and an energy storage device
  • A silicon-based composite negative electrode material, a preparation method thereof and an energy storage device
  • A silicon-based composite negative electrode material, a preparation method thereof and an energy storage device

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preparation example Construction

[0037] Correspondingly, as figure 2 As shown, the embodiment of the present invention provides a method for preparing the above-mentioned silicon-based composite negative electrode material, and the specific steps include:

[0038] S10, taking a silicon-based material, and growing a two-dimensional quinone aldehyde covalent organic framework material in situ on the surface of the silicon-based material to form a first coating layer;

[0039] S20. Coating a fast-conducting ion material on the surface of the first coating layer to form a second coating layer, that is, to obtain a silicon-based composite negative electrode material, the silicon-based composite negative electrode material includes a silicon-based material core and is coated on the A cladding layer on the surface of the silicon-based material inner core, the cladding layer includes the first cladding layer arranged on the surface of the silicon-based material inner core and the second cladding layer arranged on th...

Embodiment 1

[0052] This example provides a method for preparing a silicon-based composite negative electrode material (Si@DAAQ-TFP@LATP), and a method for assembling Si@DAAQ-TFP@LATP as a negative electrode of a lithium-ion battery into a lithium secondary battery:

[0053] S10, Preparation of Si@DAAQ-TFP

[0054] Dissolve commercial nano-silicon with a median particle size of 100nm and DAAQ and TFP with a stoichiometric ratio of 1:1 in a mixed solvent composed of N,N-dimethylacetamide and mesitylene to obtain a mixed solution. Under sealed conditions, react the mixed solution at 80°C-140°C for 1d-7d, after cooling to room temperature, centrifuge the obtained material to obtain a solid, and use N,N-dimethylformamide (DMF) first and then use The solid was washed with acetone and dried to obtain DAAQ-TFP-coated nano-silicon, that is, Si@DAAQ-TFP.

[0055] S20, Preparation of Si@DAAQ-TFP@LATP

[0056] Add 10g Si@DAAQ-TFP into 100mL deionized water, after ultrasonic dispersion, add lithium ...

Embodiment 2

[0060] This example provides a method for preparing a silicon-based composite negative electrode material (SiO@DABQ-TFP@LLZO), using SiO@DABQ-TFP@LLZO as a negative electrode material for a lithium-ion battery, and assembling it into a secondary battery:

[0061] S10, Preparation of SiO@DABQ-TFP

[0062] SiO with a particle size of 1 μm-10 μm and 2,5-diamino-1,4-dihydroxybenzene (DABH) and TFP with a stoichiometric ratio of 7:2 were dissolved in N,N-dimethylacetamide and homogenized In a mixed solvent composed of trimethylbenzene, the mixed solution was obtained, and the mixed solution was reacted at 85°C-120°C for 1d-7d under the condition of anaerobic sealing, and after cooling to room temperature, the obtained material was centrifuged to obtain a solid, and first The solid was washed with N,N-dimethylformamide (DMF) followed by THF, and dried to obtain the SiO@DABH-TFP material. Then, SiO@DABH-TFP was gradually added to triethylamine to obtain a suspension. The suspension ...

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Abstract

An embodiment of the present invention provides a silicon-based composite negative electrode material, which comprises a silicon-based material core and a cladding layer coated on the surface of the silicon-based material core, the cladding layer comprises a first cladding layer disposed on the core surface of the silicon-based material and a second cladding layer disposed on the surface of the first cladding layer, the first cladding layer comprising a two-dimensional quinone-aldehyde covalent organic skeleton material, and the second cladding layer comprising a fast conductive ion material.Wherein, the first cladding layer has superhigh toughness and ordered pore structure, can effectively absorb the stress generated by the expansion of the silicon-based material core and ensure the integrity of the cladding layer, simultaneously has high conductivity and ionic conductivity, and can effectively improve the electronic and ionic conductivity effect of the cladding layer; and the second cladding layer has high rigidity, the structure stability of the whole material can be maintained when the silicon expands and contracts, and the volume expansion can be effectively alleviated. Theembodiment of the invention also provides a preparation method of the silicon-based composite negative electrode material and an energy storage device comprising the silicon-based composite negative electrode material.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a silicon-based composite negative electrode material, a preparation method thereof, and an energy storage device. Background technique [0002] The positive and negative electrode materials of lithium-ion batteries are the main part of the energy storage function, and are the most direct embodiment of the energy density, cycle performance and safety performance of the battery cell. When the current commercial cathode material lithium cobalt oxide reaches its maximum limit (4.4V, compaction 4.2g / cm 3 ), the capacity of the negative electrode is crucial to the improvement of the energy density of the entire battery cell. However, the current commercial graphite anode actually uses a gram capacity of 360mAh / g, which is close to its theoretical value (372mAh / g), so it is necessary to develop new high-capacity commercial anode materials. [0003] Silicon-based materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10H01M2300/0071H01M2300/0068H01M4/483H01M10/054H01G11/50H01G11/06H01M10/0562
Inventor 苏航王平华李阳兴
Owner HUAWEI TECH CO LTD
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