A kind of positive electrode lithium supplement material and preparation method and application thereof

A technology of lithium supplementation and positive electrode, which is applied in the field of positive electrode lithium supplementation materials and its preparation, can solve the problems of high equipment cost investment, residual non-lithium source components, and decreased discharge capacity, so as to improve processing and gas production performance, and reduce product residues. Lithium content, the effect of reducing the mixed discharge of lithium and nickel

Active Publication Date: 2022-04-15
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, it also caused the residue of non-lithium source components in the lithium supplement material, leaving more impurities, causing serious self-discharge of the battery cell, and a decrease in the discharge capacity.
[0005] In CN1290209C, it is reported that lithium metal, negative electrode material and non-aqueous liquid are mixed to form a slurry, the slurry is coated on the negative electrode current collector, and the dry slurry is prepared into a battery. Although this method can improve the initial efficiency, due to the high reaction rate of lithium metal Activity, the entire operation needs to be carried out in an anhydrous and dry environment, resulting in difficult operation and high equipment cost
[0006] The above solutions have problems such as low capacity, high cost, or low efficiency. Therefore, it is urgent to develop a lithium-supplementing material with high capacity, low cost, and high battery efficiency for application in lithium-ion batteries.

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
  • A kind of positive electrode lithium supplement material and preparation method and application thereof
  • A kind of positive electrode lithium supplement material and preparation method and application thereof
  • A kind of positive electrode lithium supplement material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a positive electrode lithium supplement material, and the positive electrode lithium supplement material is prepared by the following method:

[0055] (1) Dissolve 0.8mol / L nickel nitrate and 0.8mol / L copper nitrate in water to obtain a nickel and copper salt solution with a concentration of 0.8mol / L, add 1mol / L ammonia water while stirring, adjust pH to be 9.5 and let stand 8h, after filtration, washing and drying, a solid mixture is obtained, the solid mixture is raised to 300°C at a heating rate of 50°C / h, and the precursor is obtained by sintering for 6h;

[0056] (2) Mix the precursor obtained in step (1) with lithium carbonate in a molar ratio of 1.5:1, add 0.1% alumina at the same time, and mix under a vacuum of 78 kpa to obtain mixed powder, which is heated in nitrogen. In an inert atmosphere, at a heating rate of 6 °C / H, to 450 °C, one-step sintering for 2 h, and then heating to 800 °C at 10 °C / h, two-step sintering for 10 h. The furna...

Embodiment 2

[0059] This embodiment provides a positive electrode lithium supplement material, and the positive electrode lithium supplement material is prepared by the following method:

[0060] (1) Dissolve 0.8mol / L nickel sulfate and 0.8mol / L copper nitrate in water to obtain Ni and copper salt solution with a concentration of 1.0mol / L, add 1.2mol / L ammonia water while stirring, adjust the pH to be 10 and let stand 8h, after filtration, washing and drying, a solid mixture was obtained, the solid mixture was raised to 320°C at a heating rate of 55°C / h, and the precursor was obtained by sintering for 7h;

[0061] (2) Mixing the precursor obtained in step (1) with lithium hydroxide in a molar ratio of 1.5:1, adding 0.15% titanium oxide by mass at the same time, and mixing under a vacuum of 76 kpa to obtain a mixed powder, which is then heated under nitrogen. In an inert atmosphere, at a heating rate of 8°C / H, to 480°C, one-step sintering for 2h, and then heating to 900°C at 15°C / h, two-ste...

Embodiment 3

[0063] The only difference between this embodiment and embodiment 1 is that the temperature of the one-step sintering in step (2) is 400° C., and other conditions and parameters are exactly the same as those of embodiment 1.

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
current efficiencyaaaaaaaaaa
Login to view more

Abstract

The invention provides a positive electrode lithium supplement material and its preparation method and application, the positive electrode lithium supplement material comprises Li 2‑x Ni 1‑ y m y o 2 and coated in Li 2‑x Ni 1‑y m y o 2 Surface Me m o n A cladding layer; wherein the M includes any one or a combination of at least two of Cu, Fe or V, and the Me includes any one or a combination of at least two of Ti, Al, Zr or B, the present invention The invention uses low-cost metal elements for precursor co-precipitation doping, which can replace part of Ni while reducing costs 2+ , reduce lithium-nickel mixing, and stabilize the structure during the cycle of the cell, reduce the amount of oxygen released, in the Li 2‑x Ni 1‑ y m y o 2 Me m o n The coating layer greatly reduces the amount of residual lithium in the finished product, improves processing and gas production performance, and at the same time can inhibit the dissolution of transition metals nickel, copper, and iron, and the anode damages the SEI film, thereby improving the cycle.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive electrode lithium supplement material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and good safety performance, and have been widely used in portable electronic products and electric vehicles. With the rapid development of new energy vehicles, smart grids, and distributed energy storage, higher requirements have been placed on the energy density of new energy devices, and there is an urgent need to study high-capacity electrode materials. High-capacity electrode materials are often accompanied by low first efficiency. During the first charge and discharge of lithium-ion batteries, with the formation of SEI films on the surfaces of positive and negative electrodes, the limited number of active lithium ions in the battery will inevitably be consumed. As ...

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): H01M4/36H01M4/525H01M4/131H01M4/1391H01M10/0525H01M10/42
CPCH01M4/366H01M4/525H01M4/131H01M4/1391H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 孙化雨李昊
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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