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Lithium titanate negative plate, preparation method thereof, lithium ion capacitor and battery

A lithium titanate and negative electrode technology, which is applied in the field of capacitors, can solve the problems of high requirements for experimental equipment, low volatility, and complicated slurry preparation process, and achieve the effect of simple process and low cost

Active Publication Date: 2014-09-24
CHANGSHA GUORONG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of this process is relatively high, and NMP has stable chemical properties, low volatility, high boiling point, and difficult recovery and post-treatment; reaction, which affects the physical properties of the slurry; in order to strictly control the moisture, the slurry preparation process is relatively complicated, and the requirements for experimental equipment are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Lithium titanate negative electrode sheet preparation: prepare negative electrode slurry and obtain negative electrode current collector substrate; apply the negative electrode slurry on the surface of the negative electrode current collector substrate and dry to form an active material slurry layer; apply the negative electrode slurry The negative electrode current collector substrate of the first layer is rolled and cut, placed in a vacuum drying box, vacuumed, filled with dry air, vacuumed again, and vacuum-dried for more than 48 hours to obtain the lithium titanate negative electrode sheet, wherein the The negative electrode current collector matrix is ​​aluminum foil, and the preparation of the negative electrode slurry includes the following processes:

[0028] 1) After mixing 8 parts by weight of binder LA132 and 330 parts by weight of distilled water evenly, add 10 parts by weight of Super P conductive carbon black, and stir for 2.5 hours;

[0029] 2) Add 42 par...

Embodiment 2

[0034] Lithium titanate negative electrode sheet preparation: prepare negative electrode slurry and obtain negative electrode current collector substrate; apply the negative electrode slurry on the surface of the negative electrode current collector substrate and dry to form an active material slurry layer; apply the negative electrode slurry The negative electrode current collector substrate of the first layer is rolled and cut, placed in a vacuum drying box, vacuumed, filled with dry air, vacuumed again, and vacuum-dried for more than 48 hours to obtain the lithium titanate negative electrode sheet, wherein the The negative electrode current collector matrix is ​​aluminum foil, and the preparation of the negative electrode slurry includes the following processes:

[0035] 1) After mixing 6 parts by weight of binder LA133 and 300 parts by weight of distilled water evenly, add 9 parts by weight of conductive carbon black, mix with Super P, and stir for 1.5 hours;

[0036] 2) A...

Embodiment 3

[0041] Lithium titanate negative electrode sheet preparation: prepare negative electrode slurry and obtain negative electrode current collector substrate; apply the negative electrode slurry on the surface of the negative electrode current collector substrate and dry to form an active material slurry layer; apply the negative electrode slurry The negative electrode current collector substrate of the first layer is rolled and cut, placed in a vacuum drying box, vacuumed, filled with dry air, vacuumed again, and vacuum-dried for more than 48 hours to obtain the lithium titanate negative electrode sheet, wherein the The negative electrode current collector matrix is ​​aluminum foil, and the preparation of the negative electrode slurry includes the following processes:

[0042] 1) After mixing 3 parts by weight of binder (CMC+SBR, wherein the mass ratio of CMC to SBR is 1:1), 260 parts by weight of distilled water, add 7 parts by weight of conductive carbon black, mix with Super P,...

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PUM

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Abstract

The invention discloses a lithium titanate negative plate, a preparation method of the lithium titanate negative plate, a lithium ion capacitor and a battery. The preparation method of the lithium titanate negative plate includes the steps that negative electrode paste is prepared, and negative electrode current collector substrate is obtained; the surface of the negative electrode current collector substrate is coated with the negative electrode paste, and then drying is performed to form an active material paste layer; the negative electrode current collector substrate coated with the negative electrode paste layer is rolled, sheared and dried to obtain the lithium titanate negative plate. The preparation method of the negative electrode paste includes the following steps that (1), by weight, 3-8 parts of binding agents and 260-330 parts of distilled water are evenly mixed, conductive carbon black is added for mixing, and then stirring is performed for 0.5 h-1 h; (2), by weight, 42-48 parts of lithium titanate is added into a mixed solution obtained in the step (1) through preparation, and then stirring is performed for 0.5 h-1 h; (3), by weight, 40-46 parts of lithium titanate is added into a mixed solution obtained in the step (2) through preparation, and then stirring is performed for 0.5 h-1 h; the Brookfield viscosity of the paste is adjusted to 1500 cps-2800 cps, and then stirring is performed for 6 h-8 h at a high speed. The lithium ion capacitor and the battery have the lithium titanate negative plates.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a method for preparing a lithium titanate negative electrode sheet, a lithium titanate negative electrode sheet prepared by the method, and a lithium ion capacitor and a battery containing the negative electrode sheet. Background technique [0002] Lithium titanate has good application prospects in lithium-ion batteries and hybrid capacitor batteries. Lithium titanate is a zero-strain material, and its lattice constant and volume change are very small during charging and discharging, so it has good cycle performance; its lithium ion diffusion coefficient is high, which can realize high-rate charging and discharging; and titanic acid The potential of lithium is higher than that of pure metal lithium, it is not easy to generate lithium dendrites, and it has high safety. Lithium titanate, as an anode material, has great potential applications in the occasions with lo...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01G9/042
CPCY02E60/122Y02E60/13H01G11/50H01G11/06H01G11/86
Inventor 谢镕安宋云峰林忠富况皓吴丽君李永龙
Owner CHANGSHA GUORONG NEW ENERGY