A lithium supplemental additive and its preparation method are provide

An additive and lithium-replenishing technology, applied in final product manufacturing, sustainable manufacturing/processing, electrolyte battery manufacturing, etc., can solve problems such as inability to achieve micro-nano level, inability to use it out of the box, corrosion and leakage, etc. The preparation method is simple and reliable, the initial discharge capacity is improved, and the consumption of lithium is compensated.

Active Publication Date: 2018-12-14
安普瑞斯(无锡)有限公司
View PDF12 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium metal is difficult to prepare into micropowder, therefore, in the synthetic process of the patent document of application publication number CN107221650A, the mixing of lithium metal and the precursor cannot achieve the mixing of micro-nano level; moreover, lithium metal is transformed into Liquid, metal lithium is very active in the molten state, and can react with various common crucible materials, such as quartz, corundum, ceramics, graphite, etc. Currently, only stainless steel crucibles can be used, and the life of the crucible is short, and corrosion will occur soon Leakage situation; metal lithium raw materials are difficult to store, and cannot be used immediately. The mixing of precursor powder and metal lithium needs to be completed under an argon protective atmosphere, and there are certain difficulties in actual operation and 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
  • A lithium supplemental additive and its preparation method are provide
  • A lithium supplemental additive and its preparation method are provide
  • A lithium supplemental additive and its preparation method are provide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to CoMn(OH) 2 0.05Ti(OH) 4The molar ratio of metal elements in the chemical formula Cobalt sulfate, manganese sulfate, and titanium sulfate are prepared into a soluble metal mixed salt solution with a total concentration of metal ions of 1.5mol / l; at the same time, a sodium hydroxide solution with a concentration of 8mol / l and a concentration of 10mol / l of ammonia water; add ammonia water with a concentration of 10mol / l into the reactor as the bottom liquid of the reaction kettle, so that the concentration of ammonia water in the bottom liquid of the reaction kettle is controlled at 3.5g / l, and then the concentration is 8mol / l pumped through the peristaltic pump The sodium hydroxide solution is used to adjust the pH in the reaction kettle; the soluble metal mixed salt solution, sodium hydroxide solution, and ammonia water prepared by the peristaltic pump are added to the reaction kettle in parallel for stirring reaction; the temperature of the reaction kettle...

Embodiment 2

[0042] Select cobalt oxide with a D50 of 7 μm, lithium carbonate, and aluminum hydroxide, mix them uniformly according to the molar ratio of 1:6.06:0.4, and then sinter them at 1100°C for 9 hours in an air atmosphere; Iron, sieved to obtain the precursors of Li, Co, Al.

[0043] Precursors of Li, Co, Al in H 2 Ar-H with a volume content of 5% 2 Sintering at a temperature of 500°C for 6 hours under a mixed gas; after cooling, pass through dry air, and sintering at 80°C for 4 hours, after crushing and sieving, the final product is obtained. The appearance of the lithium-supplementing additive is as follows: figure 2 As shown, D50 is 7.1 μm, and the product 3Li is obtained 2 O 0.3Co 0.7CoO 0.2Al 2 o 3 The serial number is lithium supplement additive B.

Embodiment 3

[0045] Aluminum sulfate is dissolved in the cobalt sulfate solution, and it is configured into a mixed metal salt solution with cobalt ion and aluminum ion concentrations of 90g / L and 18g / L respectively. Inject a certain amount of pure water into the reaction kettle as the bottom liquid, add ammonium bicarbonate solution to adjust the pH value to 8.5, raise the temperature to 40°C, and mix the cobalt-aluminum mixed salt solution and the concentration of 230g / L bicarbonate at a stirring speed of 140rpm The ammonium solution is added to the reaction kettle at the same time to cause precipitation reaction. During the feeding process, the pH value of the reaction solution is controlled at about 8.0 until the material grows to 8 μm. After the feeding is completed, the stirring is stopped. The space continues to add material, so that the crystal continues to grow to 7 μm. The slurry is dehydrated, washed, dried, crushed and sieved to obtain a precursor powder containing Co and Al. ...

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
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a lithium supplement additive and a preparation method thereof, and a lithium ion battery containing the lithium supplement additive. A lithium supplemental additive is a powerparticle, that median particle size D50 is greater than or equal to 0.1 mu m and less than or equal to 20 mu m, and the chemical formula is xLi 2O. YM. ZNaOb, wherein, y) 0, z) 0, 2x-Y-Z*a)0.1, b)0;M is one or more of Co, Mn and N is one or more of Co, Mn, Al and Ti. The lithium supplement additive is combined with metal lithium, Compared with organic lithium, organic lithium is more stable andsafer. When added in lithium ion battery, organic lithium can provide lithium source during the first charge, which can compensate the lithium consumption when the positive electrode and negative electrode form SEI film, improve the first discharge capacity, cycle performance and energy density, and is especially suitable for the negative electrode system with low first charge-discharge efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to a lithium supplement additive and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high voltage and high energy density, and are widely used in power supplies for consumer electronics, energy storage systems, and power systems. Improving the energy density of lithium-ion batteries has always been the most concerned by the industry and academia question. [0003] During the first charging process of the battery, a surface solid electrolyte film (SEI film) is formed on the surface of the positive and negative electrodes, which will consume lithium and irreversibly solidify lithium into lithium carbonate, alkoxide, ester salt, etc., resulting in reversible lithium Loss, reduce the first efficiency, reduce the battery discharge capacity. Especially when some high-capacity new negative electrod...

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): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/058
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 翟传鑫张明慧徐子福
Owner 安普瑞斯(无锡)有限公司
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