Electrochemical active material with core-shell structure, preparation method and battery

A technology of core-shell structure and active materials, applied in the direction of electrochemical generators, structural parts, battery electrodes, etc., can solve the problems of poor safety, poor cycle life, and difficulty in obtaining wide applications, so as to avoid the loss of active materials and improve performance, improvement of first discharge efficiency and cycle life

Active Publication Date: 2021-08-06
SUZHOU FIRST ELEMENT NANO TECH
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries currently have several major problems: low first battery efficiency, poor cycle life, and low battery voltage
Only the problem of low efficiency for the first time has not been solved well, and there is no mature solution at present
[0003] Although the inert lithium powder developed by 3M can be used as a supplementary negative electrode lithium source, it is difficult to obtain wide application in the short term due to poor safety and high cost.
But they first need to separately prepare the cathode material and Li 5 FeO 4 , while Li 5 FeO 4 Lively in nature, it is easy to react with water vapor and CO in the air 2 Reaction and deterioration, to prepare high-purity Li 5 FeO 4 extremely difficult

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
  • Electrochemical active material with core-shell structure, preparation method and battery
  • Electrochemical active material with core-shell structure, preparation method and battery
  • Electrochemical active material with core-shell structure, preparation method and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The embodiment of the present invention relates to a method for preparing the above-mentioned electrochemically active material with a core-shell structure, including:

[0034] Co-precipitation step: under the protection of an inert atmosphere, Li 5 FeO 4 The precursor LFO-P and the shell salt solution are homogenized in the reaction kettle, the temperature is controlled within the range of 40-70°C, and the pH value of the solution in the kettle is adjusted with a complexing agent under continuous stirring conditions until the pH value is in the range of 11-12; Conduct constant temperature reaction in the range of 40-70°C, stir and age to obtain LFO-P / Ni x co y mn z (OH) 2(x+y+z) ·Al 1-x-y-z (OH) 3(1-x-y-z) Suspension, finally solid-liquid separation to obtain a solid solution, washing and drying the solid solution to obtain LFO-P / Ni x co y mn z (OH) 2(x+y+z) ·Al 1-x-y-z (OH) 3(1-x-y-z) Powder;

[0035] Synthesis steps of core-shell structure: LFO-P / Ni x c...

Embodiment 1

[0046] This embodiment relates to the core-shell structure electrochemically active material LFO-LiNi x co y mn z Al 1-x-y-z o 2 The preparation method comprises the following steps:

[0047] S1, preparation of Li 5 FeO 4 Precursor LFO-P: According to the stoichiometric ratio of Li:Fe=35:1, lithium acetate and iron citrate were sanded and mixed evenly, spray dried, tableted and granulated, then placed in a tube furnace at 2°C / The heating rate of min is raised to 450°C, and the temperature is kept for 4.5 hours to pre-decompose at low temperature to obtain Li 5 FeO 4 Precursor LFO-P, LiFeO 2 -17Li 2 CO 3 ;

[0048] S2, preparation of Ni 0.5 co 0.2 mn 0.25 (OH) 1.9 ·Al 0.05 (OH) 0.15 : According to the ratio of Ni, Co, Mn and Al stoichiometric ratio 0.5:0.2:0.25:0.05, weigh NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O and Al(NO 3 )3 9H 2 O, be prepared with the shell salt solution that total metal ion content is 3mol / L; Press the ratio of 80 parts by w...

Embodiment 2

[0051] S1, preparation of Li 5 FeO 4 Precursor LFO-P: According to the stoichiometric ratio of Li:Fe=27:1, Lithium acetate and iron citrate were sanded and mixed evenly, spray-dried, tableted and granulated, then placed in a tube furnace at 2°C / The heating rate of min is raised to 450°C, and the temperature is kept for 4.5 hours to pre-decompose at low temperature to obtain Li 5 FeO 4 Precursor LFO-P, LiFeO 2 -13Li 2 CO 3 ;

[0052] S2, preparation of Co(OH) 2 : Weigh an appropriate amount of CoSO 4 ·7H 2 O formulated as Co 2+ Salt solution with an ion content of 3mol / L; 17.1 parts by weight of LFO-P, CoSO 4 ·7H 2 Add LFO-P in the ratio of 100 parts by weight to the above-mentioned salt solution, homogenize it, pump it into the reaction kettle protected by an inert atmosphere, control the temperature at 65° C., and continuously stir with 300r / min stirring speed. Adjust the pH value of the solution in the kettle to 11.6, react at a constant temperature, and carry o...

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
sizeaaaaaaaaaa
Login to view more

Abstract

An electrochemical active material with a core-shell structure, a preparation method and a battery belong to the technical field of functional materials. The chemical formula of the core-shell structure electrochemically active material is LFO‑LiNi x co y mn z Al 1‑x‑y‑ z o 2 , the nuclei are prelithiated Li 5 FeO 4 , the shell is LiNi x co y mn z Al 1‑x‑y‑z o 2 active material. The core-shell structure electrochemically active material is obtained by coating nano-Li 5 FeO 4 Deposition of Ni on the surface of the precursor x co y mn z (OH) 2(x+y+z) ·Al 1‑x‑y‑z (OH) 3(1‑x‑y‑z) Subsection insulation synthesis again. Li in the present invention 5 FeO 4 As a pre-lithiation agent, it is coated inside the positive electrode material, avoiding CO in the air during the transfer and coating process 2 , water vapor contact, also avoid the battery made in the process of charge and discharge due to Li 5 FeO 4 Soluble in electrolyte leading to loss of active material.

Description

technical field [0001] The invention relates to a technology in the field of functional materials, in particular to an electrochemically active material with a core-shell structure, a preparation method and a battery. Background technique [0002] Lithium-ion batteries currently have several major problems: low first battery efficiency, poor cycle life, and low battery voltage. For the poor cycle life of lithium-ion batteries, a lot of research work has been done, and the measures taken are relatively mature; the high-voltage electrode materials and supporting electrolytes developed for low battery voltages have gradually matured and are being gradually applied. Only the problem of low efficiency for the first time has not been solved well, and there is no mature solution at present. [0003] Although the inert lithium powder developed by 3M can be used as a supplementary negative electrode lithium source, it is difficult to obtain wide application in the short term due to ...

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): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王金娥董明
Owner SUZHOU FIRST ELEMENT NANO TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap