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

Preparation method of nickel-manganese binary precursor with high electrochemical performance

An electrochemical and precursor technology, which is applied in the field of preparation of nickel-manganese binary precursors, can solve problems such as inability to produce in large quantities, and achieve the effect of improving cycle stability, improving lithium ion diffusion efficiency, and controlling the degree of compactness

Active Publication Date: 2021-01-22
ZHUJI PAWA NEW ENERGY
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis steps are simple, the price of raw materials is relatively low, and the conditions of the wet synthesis process are easy to control. Surfactants are added in the wet synthesis process. Although the binary precursor has a relatively regular morphology, it cannot be carried out in large quantities. Production

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 nickel-manganese binary precursor with high electrochemical performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment includes the following steps:

[0039] (1) Mix ammonia solution according to 1mol / L ammonia water and 1mol / L citric acid;

[0040] (2) Prepare a mixed salt solution according to the molar ratio of 2 mol / L citric acid, nickel salt and manganese salt to a sulfate molar ratio of 9:1 and the total concentration of metal salts to 3 mol / L;

[0041] (3) According to the ammonia concentration of 1mol / L and the pH value of 12.0, prepare the bottom liquid of the reaction kettle;

[0042] (4) Prepare tetrabutyl titanate solution with a concentration of 0.2mol / L as the structure control agent solution;

[0043] (5) Inject the mixed salt solution, mixed ammonia solution, structure control agent solution, and sodium hydroxide solution into the bottom liquid of the reactor, keep the temperature of the reactor at 50°C, stir at 500 rpm, and keep the nitrogen atmosphere for 8 hours to obtain the reaction slurry;

[0044] (6) The reaction slurry after step (5) was washe...

Embodiment 2

[0048] This embodiment includes the following steps:

[0049] (1) Mix ammonia solution according to 1.5mol / L ammonia water and 1.5mol / L ethylenediaminetetraacetic acid;

[0050] (2) Prepare a mixed salt solution according to the sulfate molar ratio of 3mol / L EDTA, nickel salt and manganese salt is 8:2 and the metal salt concentration is 4.5mol / L;

[0051] (3) According to the ammonia concentration of 1.5mol / L and the pH value of 12.5, prepare the reaction kettle bottom liquid;

[0052] (4) Prepare tetrapropyl titanate solution with a concentration of 0.5mol / L as the structure control agent solution;

[0053](5) Inject the mixed salt solution, mixed ammonia solution, structure control agent solution, and sodium hydroxide solution into the bottom liquid of the reactor, keep the temperature of the reactor at 60°C, stir at 600rpm, and keep the nitrogen atmosphere for 5 hours to obtain the reaction slurry;

[0054] (6) Wash the reaction slurry after step (5) with pure water at 6...

Embodiment 3

[0058] This embodiment includes the following steps:

[0059] (1) Prepare a mixed ammonia solution according to 0.8mol / L ammonia water and 0.8mol / L disodium edetate;

[0060] (2) Prepare the mixed salt solution according to the sulfate molar ratio of 0.5mol / L disodium edetate, nickel salt and manganese salt is 7:3 and the total concentration of metal salt is 2mol / L;

[0061] (3) According to the ammonia concentration of 0.8mol / L and the pH value of 11.5, prepare the bottom liquid of the reaction kettle;

[0062] (4) Prepare tetrabutyl titanate solution with a concentration of 0.8mol / L as the structure control agent solution;

[0063] (5) Inject the mixed salt solution, mixed ammonia solution, structure control agent solution, and sodium hydroxide solution into the bottom liquid of the reactor, keep the temperature of the reactor at 55°C, stir at 400rpm, and keep the nitrogen atmosphere for 8 hours to obtain the reaction slurry;

[0064] (6) The reaction slurry after step (5...

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
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a nickel-manganese binary precursor with high electrochemical performance, and belongs to the technical field of battery materials. The method comprisesthe steps of in the process of synthesizing a binary precursor by a wet method, adding a template agent and a structure control agent during coprecipitation reaction; and filtering, washing, drying, pre-sintering at high temperature, mixing with lithium and calcining the slurry to obtain a binary precursor product. The precursor surface structure framework is constructed in the precursor wet synthesis stage, the problem that the cycle performance is reduced due to structural collapse of an existing positive electrode material is solved, cobalt-free treatment of the positive electrode materialis achieved, the manufacturing cost of the positive electrode material is greatly reduced, and great commercial value is achieved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a nickel-manganese binary precursor with high electrochemical performance. Background technique [0002] In the field of power batteries, after decades of iterative updates, the mainstream systems are lithium iron phosphate system and ternary system. Compared with lithium iron phosphate, the ternary system has obvious advantages in terms of energy density, working voltage and low temperature operation. But its shortcomings are also very obvious, such as high price, poor cycle performance, and poor safety. Regarding its high price, the main reason is that cobalt in ternary materials is expensive. In order to reduce the cost of the ternary system, the research direction is developing towards low-cobalt or even cobalt-free. However, cobalt has the function of stabilizing the layered structure and improving the diffusion ...

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 Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/40C01G53/00H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2004/03C01P2004/61C01P2006/12Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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