Nanometer silicon composite particle, negative plate and solid lithium battery

A technology of composite particles and nano-silicon, applied in negative electrodes, nanotechnology, battery electrodes, etc., can solve the problems of low energy density, low theoretical capacity, and poor comprehensive electrochemical performance of lithium-ion batteries. Excellent chemical properties, improved uniformity, and low AC impedance

Pending Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the covalent metal skeleton layer is directly used as the negative electrode material of the battery. Compared with the silicon-based negative electrode material, its theoretical capacity is low, the energy density of the obtained lithium-ion battery is low, and the comprehensive electrochemical performance of the lithium-ion battery is poor.

Method used

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  • Nanometer silicon composite particle, negative plate and solid lithium battery
  • Nanometer silicon composite particle, negative plate and solid lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of Nano-Silicon Composite Particles

[0030] A nano-silicon composite particle used as a negative electrode material for a lithium battery, the nano-silicon composite particle is a nano-silicon composite particle modified by N-P-COF-GO, which is a kind of COF and GO interlaced on the surface of silicon nano-particles, N and P Co-doped structure inside COF and GO.

[0031] The preparation method of the nano-silicon composite particles comprises the following steps:

[0032] Disperse silicon nanoparticles, phosphoketene pyruvic acid, acrylamide, and graphene oxide in an organic solvent, the particle size of the silicon nanoparticles is 50 nm (purity greater than 99%), and The mass ratio of acrylamide and graphene oxide is 33:0.002:0.002:1.5, and the organic solvent is a mixed solution of dioxane and trimethylbenzene with a volume ratio of 3:1.

[0033]The above mixture was sonicated at room temperature for 60 minutes, the obtained mixed solution was added...

Embodiment 2

[0040] Compared with Example 1, the particle diameter of silicon nanoparticle is 200nm in the nano-silicon composite particle preparation process in Example 2, and the mass ratio of silicon nanoparticle, phosphoketene pyruvic acid, acrylamide and graphene oxide is 40: 0.003:0.001:0.5; the volume ratio of dioxane to trimethylbenzene was 2:0.7; after ultrasonic mixing at room temperature for 40 minutes, it was rapidly frozen in liquid nitrogen, degassed by a freezing pump-thaw cycle, and the Pyrex tube was placed at 120 Heating in the range of °C for 60 hours; vacuum drying at 60 °C for 4 hours, followed by vacuum sintering at 400 °C for 8 hours; ball milling time for 10 minutes. The remaining conditions are the same as in Example 1.

Embodiment 3

[0042] Compared with Example 1, the acrylamide in the preparation process of the nano-silicon composite particles in Example 3 was replaced by aliphatic n,n-methylenebisacrylamide, and the particle size of the silicon nanoparticles was 500 nm, and the silicon nanoparticles, The mass ratio of phosphoketene pyruvic acid, n,n-methylenebisacrylamide and graphene oxide is 30:0.001:0.003:2.0, and the volume ratio of dioxane to trimethylbenzene is 2.5:0.5; ultrasound at room temperature After mixing for 20 minutes, snap frozen in liquid nitrogen, degassed by a freeze pump-thaw cycle, and heated Pyrex tubes at 80°C for 24 hours; vacuum oven dried at 60°C for 5 hours, followed by vacuum sintering at 350°C 10 hours; ball milling time is 20 minutes. The remaining conditions are the same as in Example 1.

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Abstract

The invention relates to the technical field of battery materials, and discloses a nano silicon composite particle, a negative plate and a solid lithium battery, the nano silicon composite particle is N-P-COF-GO modified nano silicon composite particle, COF and GO are loaded on the surface of the silicon nano particle, and N and P are co-doped in the COF and GO; the preparation method comprises the following steps: dispersing silicon nanoparticles, a phosphorus source material, a nitrogen source material and graphene oxide in an organic solvent, and synthesizing N-P-COF-GO modified nano silicon composite particles by adopting a solvothermal method; the negative plate and the solid lithium battery are prepared from the nano silicon composite particles. According to the invention, the defects of obvious volume expansion and continuous growth of a surface SEI layer of a silicon material in continuous charging and discharging are overcome, rapid transmission and storage of lithium ions are realized, and a negative plate and a solid lithium battery prepared from the nano silicon composite particles have lower alternating current impedance and higher discharge capacity and cycle performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically, the invention relates to nano-silicon composite particles, a negative electrode sheet and a solid lithium battery. Background technique [0002] Silicon (Si) has a high theoretical capacity (3579mAh / g) and is considered to be one of the most promising anode materials for solid lithium batteries. Solid lithium batteries have high energy density and are the best choice for the development of next-generation lithium battery products. All-solid-state lithium batteries using silicon-based negative electrodes have a much higher energy density than current liquid lithium-ion secondary batteries, which can avoid the occurrence of lithium dendrites and have good safety performance. However, the significant volume expansion of silicon material and the continuous growth of surface solid electrolyte membrane (SEI) during continuous charge and discharge will consume free lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/134H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/134H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 宫娇娇陈军黄建根郑利峰
Owner WANXIANG 123 CO LTD
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