Preparation method of cladding material of lithium ion battery

A technology for lithium-ion batteries and coating materials, which is applied in the field of preparation of coating materials for lithium-ion batteries, can solve problems such as large solvent consumption, uneven coating, and high energy consumption, so as to simplify operating procedures and reduce production costs , reduce the effect of side effects

Inactive Publication Date: 2014-07-09
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that it is difficult to mix the core layer material and the cladding layer material evenly, and because the contact force between the solid and solid phases is small, the bonding force between the cladding layer and the core layer is not tight enough after sintering, resulting in The coating is uneven and the consistency of the material is poor. The advantage is that the energy consumption is relatively small
The problem that this method exists is to need to consume a large amount of solvents, can consume a large amount of energy in the drying process, some materials are limited by physical and chemical properties, can't be prepared into aqueous solution, need to use a large amount of organic solvents, also may cause environmental pollution (such as when coated with fluoride)
The disadvantage of this method is that it requires a large amount of solvent and consumes a lot of energy during the drying process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a preparation method of a coating material for a lithium ion battery, specifically a LiCoO 2 Surface coated with Al 2 o 3 method, including the following steps:

[0035] Step 1, the LiCoO 2 Place in a stirring tank and stir at a stirring speed of 400r / min;

[0036] Step 2: Drop the potassium aluminum sulfate aqueous solution into the sodium carbonate aqueous solution to generate aluminum hydroxide precipitate, then purify the aluminum hydroxide precipitate by dialysis, and then dry it at 15°C to form aluminum hydroxide gel after gelation glue;

[0037] Step 3, put the aluminum hydroxide gel prepared in step 2 in a spray machine, atomize the gel and spray it on LiCoO 2 surface, the spraying speed is 0.2kg / min, and the diameter of the sprayed gel droplet is 1μm. Continue to stir at a stirring speed of 400r / min to make LiCoO 2 The surface of the aluminum hydroxide gel is completely wetted by the water contained in the aluminum hydroxide gel, an...

Embodiment 2

[0040] This embodiment provides a method for preparing a coating material for a lithium ion battery, specifically a LiNiO 2 The method for surface coating MgO comprises the following steps:

[0041] Step 1, the LiNiO 2 Place in a stirring tank and stir at a stirring speed of 500r / min;

[0042] Step 2, reacting magnesium chloride solution with ammonia water to synthesize magnesium hydroxide hydrosol; then placing magnesium hydroxide hydrosol in absolute ethanol, stirring at room temperature for 2 hours to obtain magnesium hydroxide gel;

[0043] Step 3, place the magnesium hydroxide gel prepared in step 2 in a sprayer, atomize the magnesium hydroxide gel and spray it onto LiNiO 2 surface, the spraying speed is 0.1kg / min, and the diameter of the sprayed gel droplet is 2μm. Continue to stir at a stirring speed of 500r / min to make LiNiO 2 The surface of the magnesium hydroxide gel is completely wetted by the water and ethanol contained in the magnesium hydroxide gel, and makes ...

Embodiment 3

[0046] This embodiment provides a method for preparing a coating material for a lithium-ion battery, specifically a LiMn 2 o 4 Surface coated TiO 2 method, including the following steps:

[0047] Step 1, the LiMn 2 o 4 Place in a stirring tank and stir at a stirring speed of 600r / min;

[0048] Step 2, purchase commercially available nano-titanium dioxide hydrosol;

[0049] Step 3, place the nano-titanium dioxide hydrosol in step 2 in a sprayer, atomize the sol and spray it onto the LiMn 2 o 4 The surface of the surface, the spraying speed is 0.05kg / min, the diameter of the droplet of the sprayed solution is 3μm, continue to stir, the stirring speed is 600r / min, make LiMn 2 o 4 The surface of the nano-titanium dioxide hydrosol is completely wetted by the water contained in it, and makes the titanium dioxide in the LiMn 2 o 4 The surface is evenly adsorbed;

[0050] Step 4: Dry at 120°C for 10 minutes, and then calcinate at 500°C for 1 hour to increase the binding for...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a preparation method of a cladding material of a lithium ion battery. The preparation method comprises the following steps: stirring a core layer material in a stirring tank; making a cladding layer material into a solution, sol, gel or an emulsion; placing the cladding layer material into an atomizing machine, spraying the cladding layer material onto the surface of the core layer material, and continuously stirring the material; and drying, calcining and crushing the material to obtain the cladding material of the lithium ion battery. Compared with a solid-solid mixing way of the prior art, the mixing way provided by the invention ensures more uniformity in cladding; compared with a liquid-liquid mixing way and a conventional solid-liquid mixing way, the mixing way provided by the invention has the advantages that only the solvent in the sprayed solution is consumed, so that the application amount of the solvent is greatly reduced, and the energy consumption of the subsequent drying process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a coating material for lithium ion batteries. Background technique [0002] Coating materials for lithium-ion batteries generally have a core layer and a cladding layer. The function of the cladding layer is mainly to stabilize the surface of the core layer and prevent the surface structure of the core layer from being damaged, such as in LiNi 0.5 mn 1.5 o 4 The surface coating of metal oxide can improve its structural stability under high voltage (such as the technical scheme disclosed by CN102709525A), and setting a coating layer on the surface of graphite powder can also improve its structural stability (such as the Chinese patent of CN102255077A The technical solution disclosed in the application); the cladding layer can also play a role in improving the electrical conductivity, such as in LiFePO 4 Surface coating with a ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 涂健胡海波刘凯刘志航
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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