Preparation method of full-concentration gradient positive electrode material precursor, full-concentration gradient positive electrode material and preparation method of full-concentration gradient positive electrode material

A technology of full concentration gradient and positive electrode materials, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problems of intermittent control means, slow feedback, uncontrollable, etc.

Pending Publication Date: 2022-04-08
WANHUA CHEM (SICHUAN) CO LTD +1
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is CN105552361A, which synthesizes gradually changing shells by adjusting the addition ratio of the aluminum salt complexing solution in real time, but does not regulate the pH in real time; the publication number is CN111276680A, which uses the control of different reaction stages to add precipitants and complexing agents with different flow rates to regulate System pH and c

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
  • Preparation method of full-concentration gradient positive electrode material precursor, full-concentration gradient positive electrode material and preparation method of full-concentration gradient positive electrode material
  • Preparation method of full-concentration gradient positive electrode material precursor, full-concentration gradient positive electrode material and preparation method of full-concentration gradient positive electrode material
  • Preparation method of full-concentration gradient positive electrode material precursor, full-concentration gradient positive electrode material and preparation method of full-concentration gradient positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The full concentration gradient cathode material prepared in this example is LiNi 0.7 co 0.15 mn 0.15 o 2 , its preparation method comprises the steps:

[0056] (1) The preparation of raw material solution: the sodium hydroxide solution that configures 4mol / L respectively is precipitating agent, and the ammonia solution of 0.825mol / L is complexing agent, nickel sulfate hexahydrate, cobalt sulfate heptahydrate, manganese sulfate monohydrate are dissolved Configure in deionized water to obtain nickel-rich metal salt solution A (Ni:Co:Mn=9:0.5:0.5) and nickel-poor metal salt solution B (Ni:Co:Mn =5:2.5:2.5).

[0057] (2) Synthesis of precursors: Prepare an alkaline base liquid with a pH of 12.00 (sodium hydroxide configuration), an ammonia concentration of 0.9 mol / L, and a volume of 20 L in the reaction kettle, and continuously inject nitrogen gas for 20 minutes to remove the dissolution of the base liquid Oxygen, and keep the reactor sealed and slightly positive pres...

Embodiment 2

[0109] The full concentration gradient cathode material prepared in this example is LiNi 0.6 co 0.2 mn 0.2 o 2 , its preparation method comprises the steps:

[0110] (1) Preparation of raw material solution: configure respectively 4mol / L sodium hydroxide solution as precipitant, 0.525mol / L ammonia solution as complexing agent, dissolve nickel sulfate hexahydrate, cobalt sulfate heptahydrate and manganese sulfate monohydrate The nickel-rich metal salt solution A (Ni:Co:Mn=8:1:1) and the nickel-poor metal salt solution B (Ni:Co:Mn=4:3: 3).

[0111] (2) Synthesis of precursors: Prepare an alkaline base liquid with a pH of 11.80, an ammonia concentration of 0.8 mol / L, and a volume of 20 L in the reactor, and continuously feed nitrogen for 20 minutes to remove dissolved oxygen in the base liquid, and keep the reactor Sealed and slightly positive pressure, the reactor does not require inert gas protection throughout the process. The temperature of the reaction system was contr...

Embodiment 3

[0118] The full concentration gradient cathode material prepared in this example is LiNi 0.5 co 0.25 mn 0.25 o 2 , its preparation method comprises the steps:

[0119] (1) Preparation of raw material solution: configure respectively 4mol / L sodium hydroxide solution as precipitant, 0.15mol / L ammonia solution as complexing agent, dissolve nickel sulfate hexahydrate, cobalt sulfate heptahydrate and manganese sulfate monohydrate Configure the nickel-rich metal salt solution A (Ni:Co:Mn=8:1:1) and the nickel-poor metal salt solution B (Ni:Co:Mn=2:4:1) of the same volume of 2mol / L in deionized water 4).

[0120] (2) Synthesis of precursors: Prepare an alkaline base liquid with a pH of 11.80, an ammonia concentration of 0.8 mol / L, and a volume of 20 L in the reactor, and continuously feed nitrogen for 20 minutes to remove dissolved oxygen in the base liquid, and keep the reactor Sealed and slightly positive pressure, the reactor does not require inert gas protection throughout t...

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

No PUM Login to view more

Abstract

The invention discloses a preparation method of a full-concentration gradient positive electrode material precursor, a full-concentration gradient positive electrode material and a preparation method of the full-concentration gradient positive electrode material. The method comprises the following steps: (1) adding a nickel-poor solution into a nickel-rich solution to obtain a metal salt solution, adding the metal salt solution, a precipitator a and a complexing agent a into a base solution containing the precipitator and the complexing agent at the same time, and controlling the pH in a reaction system and the concentration of the complexing agent to be gradually reduced along with the reduction of the nickel concentration in the added metal salt solution; and (2) separating, washing and drying the product obtained in the step (1) to prepare the full-concentration gradient positive electrode material precursor with excellent crystallinity. And then preparing the full-concentration gradient positive electrode material with a lithium source. The positive electrode material inherits the excellent crystallinity of the precursor, has high nickel content, high specific discharge capacity and stable structure, is not easy to generate microcracks in the charge-discharge process, and avoids additional side reaction, so that the positive electrode material also has excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a method for full concentration gradient positive electrode materials. Background technique [0002] As a green energy source with high energy density, lithium-ion batteries are widely used in various 3C digital fields and electric vehicles. Although the current lithium-ion batteries can meet the needs of small devices, they still need higher energy density and better life to meet the needs of electric vehicle power batteries. Therefore, further improving the energy density and cycle performance of lithium-ion batteries has become the next step development core. Lithium-ion battery cathode material is not only the decisive factor of battery cost, but also determines the energy density and life of the battery. Among them, the lithium-ion battery ternary cathode material LiNi 1-x-y co x mn y o 2 Due to i...

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
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 张儒超刘逸群陈睿董林涛安孝坤姜雨良张洁
Owner WANHUA CHEM (SICHUAN) 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