Negative pole material, preparation for battery and battery manufactured by the negative pole material

A technology of battery negative electrode and negative electrode active material, which is applied in electrode manufacturing, battery electrode, secondary battery and other directions, can solve the problems of affecting the compaction density of negative electrode active material, the difficulty of battery volume specific capacity, and affecting the electrical performance of finished batteries, etc. To achieve the effect of improving compaction density, increasing volume capacity and increasing density

Active Publication Date: 2009-03-25
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When natural graphite is applied to the negative electrode active material of lithium battery, it has the advantage of high gram capacity due to its high degree of graphitization; however, the structural characteristics of this high degree of graphitization make it possible to use natural graphite as lithium battery When the negative electrode sheet of the

Method used

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  • Negative pole material, preparation for battery and battery manufactured by the negative pole material
  • Negative pole material, preparation for battery and battery manufactured by the negative pole material
  • Negative pole material, preparation for battery and battery manufactured by the negative pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Anode material formula:

[0022] Natural spherical graphite (including artificial graphite): natural flake graphite conductive agent: thickener CMC: binder SBR: solvent water = 100:2.5:1.5:4.0:100.

[0023] 2. Preparation of negative electrode slurry

[0024] Preparation of rubber compound: first add thickener CMC (molecular weight distribution in 8-15W) and add 35% of the total solvent water, stir in a mixer for 30 minutes, and then add 25% of solvent water to continue stirring , The stirring time is 15 minutes, and finally 35% of the solvent is added for stirring, and the stirring time is 45 minutes to complete the process of preparing the adhesive glue;

[0025] Pulping: Stir the natural spherical graphite (including artificial graphite) and natural flake graphite conductive agent in a vacuum mixer at 10Hz revolution for 1 hour, add 10% of the rubber material prepared above and stir for 0.5 hour at 10Hz revolution, then add 55% of glue Stir the material at 40Hz revolu...

Embodiment 2

[0032] 1. Anode material formula:

[0033] Natural spherical graphite (including artificial graphite): natural flake graphite conductive agent: thickener CMC: binder HPMC: solvent = 100:2.5:1.5:3:100, wherein the molecular weight distribution of binder CMC is 10-30W.

[0034] 2. Preparation of negative electrode slurry

[0035] To prepare the rubber compound, first add the thickener CMC and 80% of the solvent (the solvent can also be added step by step), and stir in a mixer (which can be an egg beater or other type of mixer), and the stirring time is 10 minutes ~12 hours to complete the process of preparing the binder glue on the premise of ensuring the full dissolution and dispersion of the binder glue;

[0036] The preparation process of the negative electrode slurry is the same as in the first embodiment.

[0037] 3. Preparation of finished batteries

[0038] The above-mentioned negative electrode material is pressed into a negative pole piece, and the electrolyte system and th...

Embodiment 3

[0043] 1. Anode material formula:

[0044](a) Natural graphite: artificial graphite: conductive agent: thickener CMC: binder SBR: solvent = 90:10:2.5:1.0:3.0:100;

[0045] (b) Natural graphite: artificial graphite: conductive agent: thickener CMC: binder PTFE: solvent=80:20:2.5:1.0:3.0:100;

[0046] (c) Natural graphite: artificial graphite: conductive agent: thickener CMC: binder PVO: solvent=70:30:2.5:1.0:3.0:100;

[0047] 2. Preparation of negative electrode slurry and finished battery

[0048] The artificial graphite and the conductive agent in the above formula were added to natural graphite for dry blending at the same time, and the other preparation process was the same as in Example 2.

[0049] 3. Performance test

[0050] The finished battery specific capacity and battery cycle performance test are the same as above.

[0051] After testing, the maximum usable compaction ratio of the negative pole piece of the battery prepared in this embodiment is 1.70 g / cc, and the volum...

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Abstract

The invention relates to a negative material of a battery, which comprises a carbon negative active material, a conductive agent, a thickening agent, an adhesive and a solvent, and the proportion of the parts by weight among ingredients is 110-140:1-10:1-10:1-10:80-200, wherein the carbon negative active material is a mixture of natural graphite and artificial graphite in proportion of 10: 1-4. The invention further relates to a method for preparing the negative material of the battery and a battery prepared by adopting the negative material. The invention optimizes the formula for the carbon negative material, improves the density of an electrode sheet of the negative electrode, improves the compacted density of the natural graphite used as the negative active material of a lithium battery, and meanwhile improves the volume capacity of the negative electrode, and greatly improves the circulation performance of a prepared finished product battery core.

Description

【Technical Field】 [0001] The invention relates to a chemical power source, in particular to a battery negative electrode material, a preparation method and a battery made of the negative electrode material. 【Background technique】 [0002] With the rapid development of electronic technology, lithium batteries that provide power for various portable electronic products are increasingly widely used. At present, lithium batteries have replaced nickel-cadmium batteries and nickel-hydrogen batteries in the field of small secondary batteries as commercial secondary batteries. In order to meet the higher requirements of portable electronic products on the durability of their power sources, the research and development of lithium batteries has also increased the specific energy and specific power as the primary goal, so there are higher requirements for chemical power materials. [0003] When natural graphite is applied to the negative electrode active material of lithium battery, it has ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 黄加军滕鑫何伟何名
Owner ZHENGZHOU BAK BATTERY CO LTD
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