Preparation method and device of nickel-cobalt-aluminum anode material precursor

A technology for positive electrode materials and preparation devices, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of difficult to form spherical large particle precipitation, fast aluminum ion precipitation, and unsatisfactory NCA material performance indicators, and achieve fast diffusion speed. , The process is simple and easy to control, and the effect of shortening the reaction time

Inactive Publication Date: 2016-10-26
GUANGDONG INST OF RARE METALS
View PDF13 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solubility product constant of aluminum hydroxide is 1.3×10 -33 , while nickel hydroxide and cobalt hydroxide (divalent) are 2×10 -15 and 1.6×10 -15 Therefore, when the nickel-cobalt-aluminum precursor is prepared by the chemical co-precipitation method, the precipitation of trivalent aluminum ions is particularly fast, not only difficult to form a uniform single layered structure with nickel and cobalt precipitation, but also difficult to form spherical large particle precipitation, so the precursor The performance index of NCA material obtained by calcining bulk doped lithium salt is not ideal

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 and device of nickel-cobalt-aluminum anode material precursor
  • Preparation method and device of nickel-cobalt-aluminum anode material precursor
  • Preparation method and device of nickel-cobalt-aluminum anode material precursor

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of the nickel-cobalt-aluminum cathode material precursor of the present invention comprises the following steps:

[0031] 1) Prepare nickel-cobalt-aluminum mixed salt solution containing complexing agent and strong alkali solution containing ammonia water; wherein, the preparation method of nickel-cobalt-aluminum mixed salt solution containing complexing agent is to dissolve soluble aluminum salt and complexing agent in In deionized water, after the aluminum ion reacts with the complexing agent to form an aluminum complex (dissolve and stir for 5-15 minutes), then add soluble nickel salt and soluble cobalt salt; and the concentration of metal ions in the nickel-cobalt-aluminum mixed salt solution is 0.5 ~3.5mol / L, and the total molar ratio of nickel, cobalt, and aluminum ions can be formulated according to the molar ratio of nickel, cobalt, and aluminum in the precursor of the nickel-cobalt-aluminum cathode material to be prepared; wherein, soluble...

Embodiment 1

[0037] Dissolve 80g of a complexing agent formed by ammonia water and sodium salicylate in 3L of deionized water, and add 152g of Al 2 (SO 4 ) 3 18H 2 O, after dissolving, continue stirring for 10min and then add 1912g NiSO 4 ·6H 2 O and 384g CoSO 4 ·7H 2 0, stirring and dissolving to obtain the nickel-cobalt-aluminum mixed salt solution containing complexing agent, particularly emphasized that the mol ratio of nickel, cobalt, aluminum ions and the mol ratio of nickel-cobalt-aluminum in the nickel-cobalt lithium aluminate material that needs to prepare are Consistent, that is, both are 0.8︰0.15︰0.05, to ensure that the proportion of nickel-cobalt-aluminum in the precursor formed is consistent with the required proportion of nickel-cobalt-lithium aluminate material at any time during the reaction process, and the material The composition is uniform at any time; prepare 9L of sodium hydroxide solution with a concentration of 6M, add ammonia water and mix evenly to obtain a...

Embodiment 2

[0040] Add 10g of ethylene glycol as a complexing agent into 3L of deionized water, and after it dissolves, add 101g of Al 2 (SO 4 ) 3 18H 2 O, continue to stir for 15min after dissolving, after adding 227g C 4 h 6 o 4 Co 4H 2 O and 1195g C 4 h 6 o 4 Ni·4H 2 0 is stirred until dissolving to obtain the nickel-cobalt-aluminum mixed salt solution that contains complexing agent; Configuration 9L concentration is the sodium hydroxide solution of 5M, adds ammoniacal liquor and mixes and obtains the strong alkali solution that ammonia concentration is 0.8M;

[0041] Add 3L of bottom liquid into the 20L reaction kettle, and after heating to 60°C, the stirring speed is controlled at 200-250r / min. The flow rate is 0.35L / h, adjust the flow rate of the strong alkali solution to control the pH value of the solution in the reactor between 10.5 and 11.5; after the nickel-cobalt-aluminum mixed salt solution is added, stop adding the strong alkali solution, and discharge the slurry f...

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 and a preparation device of a nickel-cobalt-aluminum anode material precursor. The preparation method is characterized by comprising the following steps: preparing a nickel-cobalt-aluminum mixed salt solution containing a complexing agent and a strong base solution containing ammonia water; combining the nickel-cobalt-aluminum mixed salt solution with the strong base solution at a uniform flowing speed and synchronously filling into a reaction kettle with a base solution for co-precipitation reaction; after the nickel-cobalt-aluminum mixed salt solution is filled, stopping adding the strong base solution, and after the reaction is completed, aging the slurry, and further performing liquid-solid separation, thereby obtaining the nickel-cobalt-aluminum anode material precursor. According to the preparation method and the device, the complexing agent is directly added into an aluminum solution, and the complexing agent is complexed with aluminum ions before the co-precipitation reaction, so that aluminum can be prevented from nucleating and precipitating immediately after entering the reaction system; meanwhile, a mixed salt solution is prepared from nickel, cobalt and aluminum together, so that the ratio of nickel and cobalt to aluminum in the formed precursor is accordant with that of an expected nickel-cobalt-lithium aluminate material at any moment, nickel, cobalt and aluminum can be subjected to uniform co-precipitation reaction, and the nickel-cobalt-aluminum anode material precursor of which indexes such as the morphology, the granularity and the density are all higher than those of similar products can be prepared.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a preparation method and device for a nickel-cobalt-aluminum cathode material precursor. Background technique [0002] Nickel-cobalt-aluminum ternary cathode material (NCA, that is, nickel-cobalt-aluminate lithium) has the advantages of high specific capacity, high voltage and good cycle performance, and has attracted extensive attention in recent years. The NCA material belongs to the aluminum-doped nickel-cobalt series cathode materials, and the representative material in the nickel-cobalt series cathode materials is LiNi 0.8 co 0.2 o 2 Compared with the same series of materials, the positive electrode material of this composition has better energy density, but has disadvantages such as poor overcharge resistance, poor thermal stability, and high irreversible capacity for the first discharge. LiNi 0.8 co 0.2 o 2 Adding Al element to the...

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): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 黄玲唐仁衡肖方明王英孙泰
Owner GUANGDONG INST OF RARE METALS
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