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Preparation method of lithium manganate battery

A lithium manganate battery, the lithium manganate technology, is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., and can solve the problems of poor high temperature performance and cycle performance, strong stability, and strong low temperature performance.

Inactive Publication Date: 2020-10-23
陆信甫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the high temperature performance and cycle performance are not good due to the dissolution of manganese. By doping aluminum and sintering granulation, the high temperature performance and cycle performance have been greatly improved, which can basically meet the actual use
In general, lithium manganese oxide batteries are low in cost, strong in stability at low temperature, strong in low temperature performance, poor in high temperature performance, and slightly faster attenuation

Method used

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  • Preparation method of lithium manganate battery
  • Preparation method of lithium manganate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Sieving the spinel lithium manganese oxide material to obtain the first active material under the screen and the second active material on the screen, the aperture of the screen is 1.4 microns;

[0030] 2) Prepare the first active material as the first slurry, in the first slurry, the first active material: binder: conductive agent = 100:4:5; prepare the second active material as the second slurry Material, in the second slurry, the second active material: binder: conductive agent = 100:3:3;

[0031] 3) Coating the first slurry on the current collector in sequence, drying; coating the second slurry on the surface of the first slurry coating layer, drying, and continuing to coat the second slurry on the surface of the second slurry coating layer A slurry, wherein the thickness ratio of the three layers of slurry is 1:2:1, the total thickness is 60 microns, dried, and hot pressed to obtain the positive electrode;

[0032] 4) Place the positive electrode obtained in st...

Embodiment 2

[0039] 1) Sieving the spinel lithium manganese oxide material to obtain the first active material under the screen and the second active material on the screen, the aperture of the screen is 1.6 microns;

[0040] 2) Prepare the first active material as the first slurry, in the first slurry, the first active material: binder: conductive agent = 100:6:7; prepare the second active material as the second slurry Material, in the second slurry, the second active material: binder: conductive agent = 100:4:4;

[0041] 3) Coating the first slurry on the current collector in sequence, drying; coating the second slurry on the surface of the first slurry coating layer, drying, and continuing to coat the second slurry on the surface of the second slurry coating layer A slurry, wherein the thickness ratio of the three layers of slurry is 1:2:1, the total thickness is 60 microns, dried, and hot pressed to obtain the positive electrode;

[0042]4) Place the positive electrode obtained in ste...

Embodiment 3

[0049] 1) Sieving the spinel lithium manganate material to obtain the first active material under the screen and the second active material on the screen, the aperture of the screen is 1.5 microns;

[0050] 2) Prepare the first active material as the first slurry, in the first slurry, the first active material: binder: conductive agent = 100:5:6; prepare the second active material as the second slurry Material, in the second slurry, the second active material: binder: conductive agent = 100:3:4;

[0051] 3) Coating the first slurry on the current collector in sequence, drying; coating the second slurry on the surface of the first slurry coating layer, drying, and continuing to coat the second slurry on the surface of the second slurry coating layer A slurry, wherein the thickness ratio of the three layers of slurry is 1:2:1, the total thickness is 60 microns, dried, and hot pressed to obtain the positive electrode;

[0052] 4) Place the positive electrode obtained in step 3) ...

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Abstract

The invention provides a preparation method of a lithium manganate battery. A positive electrode active substance of the lithium manganate battery is spinel lithium manganate, and the molecular formula of the spinel lithium manganate is LiMn2-xMxO4, wherein x ranges from 0.01 to 0.1, M is a doped metal element; and a negative electrode active substance of the lithium manganate battery is a carbon-based material. The preparation method comprises the following steps: sieving the spinel lithium manganate material; respectively pulping the active substances under the screen and the active substances on the screen; coating the surface of a current collector with the obtained pulps in sequence; drying to obtain a positive electrode; putting the positive electrode and a counter electrode lithiumsheet into an electrolyte tank; discharging to a first preset voltage; taking out the positive electrode; assembling the positive electrode and a negative electrode clamping diaphragm into a batterycell; putting the battery cell into a shell, and carrying out injection molding to obtain the lithium manganate battery. The battery obtained by the preparation method disclosed by the invention is high in energy density, good in cycle performance and high in capacity retention ratio.

Description

technical field [0001] The invention relates to a preparation method of a lithium manganate battery. Background technique [0002] Lithium manganese oxide is one of the more promising lithium ion cathode materials. Compared with traditional cathode materials such as lithium cobalt oxide, lithium manganate has the advantages of abundant resources, low cost, no pollution, good safety, and good rate performance. It is an ideal However, its poor cycle performance and electrochemical stability greatly limit its industrialization. Lithium manganate mainly includes spinel-type lithium manganate and layered structure lithium manganate, among which spinel-type lithium manganate has a stable structure and is easy to realize industrial production. Today's market products all have this structure. Spinel-type lithium manganese oxide belongs to the cubic crystal system, Fd3m space group, and the theoretical specific capacity is 148mAh / g. Due to the three-dimensional tunnel structure, lit...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M4/58H01M4/485H01M10/44H01M10/0566
CPCH01M4/485H01M4/5825H01M10/0525H01M10/0566H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 陆信甫
Owner 陆信甫
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