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Preparation method of nanocarbon/lithium titanate composite coated positive electrode material with three-dimensional porous structure

A positive electrode material, three-dimensional porous technology, applied in the field of lithium ion battery materials, can solve the problems of unsolved lithium titanate electronic conductivity, material electrochemical properties decay, battery high temperature flatulence, etc., to achieve inhibition of irreversible capacity loss, high carbon package The effect of coverage rate and high safety

Active Publication Date: 2021-04-09
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: ①Because Ni 2+ with Li + radii are close, Li will occur during charge and discharge + / Ni 2+ Mixing phenomenon, which will promote the rearrangement of atoms and the formation of disordered phases, resulting in the transformation of the material from layered structure to spinel structure and rock-salt phase structure, resulting in serious attenuation of the electrochemical properties of the material
② Residual alkali (Li 2 CO 3 and LiOH) will hinder the Li + And the transmission of electrons, which leads to the attenuation of the material capacity, and it is also easy to react with the electrolyte, resulting in high-temperature flatulence of the battery
This method improves the first coulombic efficiency of the lithium-ion battery, improves the cycle and rate performance of the lithium-ion battery, but does not solve the problem of poor electronic conductivity of lithium titanate itself and the problem of flatulence caused by direct contact with the electrolyte

Method used

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  • Preparation method of nanocarbon/lithium titanate composite coated positive electrode material with three-dimensional porous structure
  • Preparation method of nanocarbon/lithium titanate composite coated positive electrode material with three-dimensional porous structure
  • Preparation method of nanocarbon/lithium titanate composite coated positive electrode material with three-dimensional porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1, with nickel sulfate, cobalt sulfate, manganese sulfate according to molar ratio 0.6: 0.2: 0.2, make positive electrode material: LiNi 0.6 co 0.2 mn 0.2 O;

[0040] Step 2, the relative molecular mass of 1.6g is 2×10 6 Xanthan gum and 50 mL deionized water were mixed uniformly under the stirring condition of 300r / min to obtain 32 mg / mL xanthan gum solution A; 5mL tetrabutyl titanate was mixed with 2mL absolute ethanol and heated at 100r Mix evenly under the stirring condition of / min, obtain the two mixture B;

[0041] Step 3. Under the condition of strong magnetic stirring at 300r / min, add solution B dropwise to solution A at a rate of 2 drops per second to obtain xanthan gum composite titanium dioxide with a mass ratio of xanthan gum to titanium dioxide of 8:2 Mixed solution, and keep stirring for 2h;

[0042] Step 4. Under the condition of strong magnetic stirring at 300 r / min, slowly add 10 g of the positive electrode material in step 1 into the xanthan ...

Embodiment 2

[0049] Step 1, with nickel sulfate, cobalt sulfate, manganese sulfate according to molar ratio 0.5: 0.2: 0.3, make positive electrode material: LiNi 0.5 co 0.2 mn 0.3 O;

[0050] Step 2, the relative molecular mass of 8g is 5×10 6 Xanthan gum and 50 mL deionized water were mixed evenly under the stirring condition of 300r / min to obtain 160 mg / mL xanthan gum solution A; 6mL tetraethyl titanate was mixed with 3mL absolute ethanol and heated at 100r Mix evenly under the stirring condition of / min, obtain the two mixture B;

[0051] Step 3. Under the condition of strong magnetic stirring at 300r / min, add solution B dropwise to solution A at a rate of 2 drops per second to obtain xanthan gum composite titanium dioxide with a mass ratio of xanthan gum to titanium dioxide of 8.5:2.5 Mixed solution, and keep stirring for 3h;

[0052] Step 4. Under the condition of strong magnetic stirring at 300r / min, slowly add 12g of the positive electrode material in step 1 into the mixed solu...

Embodiment 3

[0056] Step 1, nickel sulfate, cobalt sulfate, manganese sulfate according to molar ratio 0.75: 0.05: 0.20, make positive electrode material: LiNi 0.75 co 0.05 mn 0.2 O;

[0057] Step 2, the relative molecular mass of 2.4g is 3×10 6 Xanthan gum and 50 mL deionized water were mixed uniformly under the stirring condition of 300r / min to obtain 48 mg / mL xanthan gum solution A; 7mL tetrabutyl titanate was mixed with 3mL absolute ethanol and heated at 100r Mix evenly under the stirring condition of / min, obtain the two mixture B;

[0058] Step 3. Under the condition of strong magnetic stirring at 300r / min, add solution B dropwise to solution A at a rate of 2 drops per second to obtain xanthan gum composite titanium dioxide with a mass ratio of xanthan gum to titanium dioxide of 8:2.2 Mixed solution, and keep stirring for 2.5h;

[0059] Step 4. Under the condition of strong magnetic stirring at 300r / min, slowly add 15g of the positive electrode material in step 1 into the xantha...

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Abstract

The invention belongs to the technical field of lithium battery materials, and provides a preparation method of a nanocarbon / lithium titanate composite coated positive electrode material with a three-dimensional porous structure. The method comprises the following steps: mixing xanthan gum and a titanium-containing compound to prepare a xanthan gum composite titanium dioxide mixed solution, then adding a positive electrode material, performing violent stirring to react completely, conducting freezing and vacuum drying, performing mixing with a lithium salt, conducting presintering and annealing to obtain the nano carbon / lithium titanate composite coated positive electrode material with a three-dimensional porous structure. Compared with a traditional method, the carbon nanofiber / lithium titanate composite coated positive electrode material with the three-dimensional porous structure prepared by the invention has the advantages of good cycling stability, rate capability and safety performance and effective inhibition of electrochemical impedance by forming the carbon nanofiber / lithium titanate nanoparticle composite material to be uniformly coated on the surface of the positive electrode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a preparation method of a composite coated lithium battery cathode material. Background technique [0002] With the rapid development of 3C electronic products, energy storage, transportation and other fields, the application space of lithium-ion batteries is also increasing. Especially with the expansion of the industrialization of new energy vehicles, the development of hybrid vehicles and all-electric vehicles has become inevitable. In this regard, the development of new energy materials with safety, environmental protection and excellent performance has gradually become an international research hotspot. However, there are many defects in the specific capacity and safety of lithium-ion battery cathode materials, which will seriously affect the performance of the entire battery. [0003] As one of the core components of the battery, the cathode material accounts f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485H01M10/0525
CPCH01M4/485H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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