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Lithium ion power battery and preparation method thereof

A power battery and lithium-ion technology, which is applied in the field of lithium-ion power batteries and their preparation, can solve the problems of poor battery performance, poor electrical conductivity, and large specific surface area, and achieve no environmental pollution, long cycle life, and high energy density. Effect

Inactive Publication Date: 2017-02-01
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, Li 4 Ti 5 o 12 Both NCA and NCA are in powder form, with fine particle size, large specific surface area, and relatively poor electrical conductivity. If batteries are prepared solely with them as electrode materials, the performance of the battery will be poor.

Method used

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  • Lithium ion power battery and preparation method thereof
  • Lithium ion power battery and preparation method thereof
  • Lithium ion power battery and preparation method thereof

Examples

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preparation example Construction

[0034] A preparation method for a lithium-ion power battery, comprising the following steps:

[0035] 1) Take the first active material, the first binder, the first conductive agent, the second active material, the second binder and the second conductive agent in the formulated amount respectively, and bake them in an environment of 115-125°C 11-13h, standby;

[0036] 2) Preparation of positive electrode slurry: take the first active material, the first binder and the first conductive agent baked in step 1), and mix them to obtain the first mixed powder; take N-methylpyrrolidone or remove Ionized water is used as the first solvent, and the first mixed powder is mixed with the first solvent, and after stirring evenly, a positive electrode slurry is obtained;

[0037] 3) Prepare the positive electrode sheet: take the positive electrode slurry, apply it evenly on the positive electrode current collector, dry, then place it on a roller press for rolling, and finally slice it to o...

Embodiment 1

[0043] A lithium-ion power battery, comprising a positive electrode sheet and a negative electrode sheet; the positive electrode sheet includes a positive electrode collector and a positive active material layer arranged on the surface of the positive electrode collector; the negative electrode sheet includes a negative electrode collector and is arranged on the The negative electrode active material layer on the surface of the negative electrode current collector. The formulations of the positive active material layer and the negative active material layer are shown in Table 1. The lithium-ion power battery is prepared according to the following steps:

[0044] 1) Take the first active material, the first binder, the first conductive agent, the second active material, the second binder and the second conductive agent in the formulated amount respectively, and bake them in an environment of 120°C for 12 hours, spare;

[0045] 2) Preparation of positive electrode slurry: take...

Embodiment 2

[0052] The difference between Example 2 and Example 1 is that: the formulations of the positive electrode active material layer and the negative electrode active material layer are different, see Table 1 for details;

[0053] The preparation steps differ, including the following distinctions:

[0054] In step 1), the baking temperature is 125° C., and the baking time is 11 hours;

[0055] In step 2), the first solvent is deionized water, and the weight of the first solvent is 30% of the weight of the first mixed powder;

[0056] In step 3), the thickness of the positive electrode collector is 13um, and the density of the positive electrode slurry on the positive electrode collector is 2g / 100cm 2 ;

[0057] In step 4), the first solvent is deionized water, and the weight of the second solvent is 30% of the weight of the second mixed powder;

[0058] In step 5), the thickness of the negative electrode collector is 12um, and the density of the negative electrode slurry on the ...

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Abstract

The invention discloses a lithium ion power battery. The lithium ion power battery comprises a positive plate and a negative plate, wherein the positive plate comprises a positive current collector and a positive active material layer arranged on the positive current collector; the positive current collector is prepared from the following components in percentages by weight: 85% to 98% of a first active material, 1% to 10% of a first binding material and 0.1% to 10% of a first conducting agent, wherein the first active material is nickel-cobalt-aluminum; the negative plate comprises a negative current collector and a negative active material layer arranged on the negative current collector; the negative active material layer is prepared from the following components in percentages by weight: 85% to 98% of a second active material, 1% to 10% of a second binding material and 0.1% to 10% of a second conducting agent, wherein the second active material is lithium titanate. The battery is high in capacity, good in rate capability, long in cycle life and high in safety performance. The invention also discloses a preparation method of the lithium ion power battery, and the preparation method is simple and safe in process, high in operability, green and environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion power battery and a preparation method thereof. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) is a new type of lithium-ion secondary battery anode material. During the intercalation or extraction of lithium ions, the Li 4 Ti 5 o 12 The crystal form will not change, and the volume change is less than 1%, so it is called "zero-strain material". cycle performance and service life. At 25°C, Li 4 Ti 5 o 12 The chemical diffusion coefficient is 2×10 -8 cm 2 / s, which is much higher than that of carbon anode materials, and the high diffusion coefficient makes this anode material fast charge and discharge. At the same time, Li 4 Ti 5 o 12 Its low temperature performance is good, its potential is higher than that of pure metal lithium, and it is not easy to produce lithium crystal dendrites, which provides a basis for ensuring the safety ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525H01M10/058B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/525H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄延新王保李亮乔晓宁
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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