Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Silicon-doped iron-based polyanion compound and its preparation method and application

A technology of polyanions and iron compounds, which is applied in the field of cathode materials for batteries, can solve the problems of lithium-ion battery coulombic efficiency and long-term cycle performance to be optimized, and achieve good coulombic efficiency, reduce crystal volume changes, and fast electrochemical reactions. Effect

Active Publication Date: 2021-10-01
CHINA SPALLATION NEUTRON SOURCE SCI CENT +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application prospects of lithium-ion batteries are broad, which will bring new opportunities for the development of science and technology, but at the same time, the new application direction will inevitably require battery technology The cost has been improved and improved, and the coulombic efficiency and long-term cycle performance of lithium-ion batteries have yet to be optimized

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon-doped iron-based polyanion compound and its preparation method and application
  • Silicon-doped iron-based polyanion compound and its preparation method and application
  • Silicon-doped iron-based polyanion compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] S1. Synthesis of Fe with three-dimensional porous crystal structure by hydrothermal method 3 (PO 4 ) 4 (PO 3 ) compound: Ferric chloride (Ⅲ) and phosphoric acid at a molar ratio of 1:1 are used as precursors, and the reaction solution is a mixture of water and ethanol at a ratio of 1:0.1 (volume ratio), with a molar concentration of 0.5M, fully After reacting for 15 hours, the three-dimensional porous crystal structure of Fe 3 (PO 4 ) 4 (PO 3 ) compound;

[0036] S2, solid doping: with the Fe that step S1 makes 3 (PO 4 ) 4 (PO 3 ) compound and silicon oxide as precursors, with a molar ratio of 0.8:0.2, ball milling and mixing at 200rpm for 36h, and then sintering at 800°C for 36h with a solid-state method. Silicon-doped Iron-based Polyanion Compound Fe with Electron Diffusion Pathway 3 (P 0.8 Si 0.2 o 4 ) 4 (P 0.8 Si 0.2 o 3 ), x=0.2.

Embodiment 2

[0038] S1. Synthesis of Fe with three-dimensional porous crystal structure by hydrothermal method 3 (PO 4 ) 4 (PO 3 ) Compound: Ferric nitrate (Ⅲ) and ammonium phosphate at a molar ratio of 1:3 are used as precursors, and the reaction solution is a mixture of water and ethanol at a ratio of 1:0.5 (volume ratio), with a molar concentration of 1M, fully reacted at 150°C 20h, the three-dimensional porous crystal structure of Fe 3 (PO 4 ) 4 (PO 3 ) compounds;

[0039] S2, solid doping: with the Fe that step S1 makes 3 (PO 4 ) 4 (PO 3 ) compound and silicon oxide as precursors, the molar ratio is 0.9:0.1, ball milling and mixing at 400rpm for 24h, and then sintering at 1000°C for 12h by solid-state method, the sintering atmosphere is 99.99% ultra-pure oxygen, and the three-dimensional ion Silicon-doped Iron-based Polyanion Compound Fe with Electron Diffusion Pathway 3 (P 0.9 Si 0.1 o 4 ) 4 (P 0.9 Si 0.1 o 3 ), x=0.1.

Embodiment 3

[0041] S1. Synthesis of Fe with three-dimensional porous crystal structure by hydrothermal method 3 (PO 4 ) 4 (PO 3 ) compound: Ferric chloride (Ⅲ) and phosphoric acid at a molar ratio of 3:1 are used as precursors, and the reaction solution is a mixture of water and ethanol at a ratio of 1:0.3 (volume ratio), with a molar concentration of 2M, fully reacted at 200°C 12h, the three-dimensional porous crystal structure of Fe 3 (PO 4 ) 4 (PO 3 ) compound;

[0042] S2, solid doping: with the Fe that step S1 makes 3 (PO 4 ) 4 (PO 3 ) compound and silicon hydroxide as precursors, the molar ratio is 0.95:0.05, ball milling and mixing at 300rpm for 48h, and then sintering at 900°C for 24h by solid-state method, the sintering atmosphere is 99.99% ultra-pure oxygen, and the three-dimensional ion Silicon-doped iron-based polyanion compound Fe with electron diffusion path 3 (P 0.95 Si 0.05 o 4 ) 4 (P 0.95 Si 0.05 o 3 ), x=0.05.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a silicon-doped iron-based polyanion compound Fe with a three-dimensional ion and electron diffusion path crystal structure 3 (P 1‑x Si x o 4 ) 4 (P 1‑x Si x o 3 ) and its preparation method and application, wherein 0<x≤0.2, the compound is prepared step by step by hydrothermal method and solid doping method, has higher tap density and energy density, better coulombic efficiency and cycle performance , can be applied as a cathode material for lithium-ion batteries, and has excellent industrial prospects.

Description

technical field [0001] The present invention relates to a compound, in particular to a novel silicon-doped iron-based polyanion compound Fe 3 (P 1-x Si x o 4 ) 4 (P 1-x Si x o 3 ) and its preparation method and application, which belong to the technical field of cathode materials for batteries. Background technique [0002] Lithium-ion battery refers to a recyclable secondary battery containing lithium ions in the electrochemical system. At present, lithium-ion battery technology is widely used and can be used as the main power supply system of mobile phones, laptop computers, unmanned aircraft and new energy vehicles. Compared with other secondary batteries, lithium-ion batteries have better performance in terms of energy density and power performance, and can also provide safer and more reliable guarantees. Therefore, they provide several times more advantages than other energy storage systems in terms of energy density. In addition, lithium-ion batteries can also...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/36H01M4/525H01M10/0525
CPCH01M4/362H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 简宏希杨华夏元华孙光爱胡启威童剑飞傅世年简宏良黄宝琴王滔宋健锐黃允然梅龙伟鲁琪李常峰刘新智罗万居
Owner CHINA SPALLATION NEUTRON SOURCE SCI CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com