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Method for preparing lithium secondary cell electrode containing nano additive

A lithium secondary battery and nano-additive technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of increasing the preparation cost of electrode materials and complex preparation process of electrode active materials.

Active Publication Date: 2007-03-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned surface modification / coating treatment is carried out after the electrode active material is synthesized, which complicates the preparation process of the electrode active material and increases the preparation cost of the electrode material

Method used

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  • Method for preparing lithium secondary cell electrode containing nano additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 01

[0069] According to the first method, a positive electrode of a lithium secondary battery containing a metal Al additive is prepared. Metal Al particles with an average particle size of 1500 nm, commercial positive electrode active material LiCoO with an average particle size of 4500 nm 2 and binder polyvinylidene fluoride (PVdF) mixed evenly. The amount of Al powder added accounted for 10% of the total weight of the positive electrode material -3 times, the binder PVdF accounts for 0.05 of the total weight of the positive electrode material, and the positive electrode active material LiCoO2 It accounts for 0.949 times of the total weight of the positive electrode material.

[0070] Add the solvent N-methylpyrrolidone (NMP) to the above mixture, the weight of the solvent accounts for 5 times the total weight of the positive electrode material, stir at 60 ° C to dissolve the binder in it, and the mixture forms a uniform slurry, which is coated according to the conventional met...

Embodiment 02

[0073] According to the first method, a lithium secondary battery positive electrode containing simple Si nano additives is prepared. The elemental Si particles with a particle size of 800 nm, the conductive agent carbon black with an average particle size of 60 nm, the binder polyacrylonitrile (PAN) and the commercial positive electrode active material LiFePO with an average particle size of 5000 nm 4 well mixed. The addition of nano-Si powder accounted for 10% of the total weight of the positive electrode material. -4 times, the binder PAN accounts for 0.05 of the total weight of the positive electrode material, the conductive agent carbon black accounts for 0.085 of the total weight of the positive electrode material, and the positive electrode active material LiFePO 4 It accounts for about 0.865 times of the total weight of the positive electrode material.

[0074] Add the solvent N-methylpyrrolidone (NMP) to the above mixture, the weight of the solvent accounts for 5 ti...

Embodiment 03

[0077] According to the second method, lithium secondary battery electrodes containing C nano-additives were prepared. C powder with an average particle size of 200 nm and commercial positive active material LiNi with an average particle size of 6000 nm 0.8 co 0.2 o 2 Mix evenly; add the acetone solution of the binder PVdF (the concentration of PVdF is 0.2 g / ml) into the above mixture, and mix evenly again at 60° C. to make a slurry. The electrode is coated according to the conventional method, and can be used as the positive electrode after drying and rolling treatment. The amount of C powder added accounted for 10% of the total weight of the positive electrode material. -5 times, the binder PVdF accounts for 0.05 of the total weight of the positive electrode material, and the positive electrode active material LiNi 0.8 co 0.2 o 2 Accounting for about 0.950 times of the total weight of the positive electrode material. The dosages of binders, corresponding solvents and ...

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Abstract

The invention is related to three methods for preparing poles of lithium secondary battery of containing Nano additive. First two methods include procedures: adding Nano material to raw material for coating positive poles or / and negative poles of lithium secondary battery; then, coating poles according to conventional method. The third method presses and embeds Nano material to conventional pole sheets prepared through coating procedure according to conventional method. The third method omits steps of surface modification / cladding process in current technique. Advantages are: simple technique, low cost, raised available capacity of material of positive material, circular stability and safety.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries, and in particular relates to a preparation method of lithium secondary battery electrodes containing nano-additives. Background technique [0002] At present, the positive electrode active materials used in lithium-ion batteries mainly include LiCoO with a rock-salt structure. 2 and LiNiO 2 , LiMn with spinel structure 2 o 4 and LiFePO with olivine structure 4 . Under the condition that the battery is charged to a potential of 4.2V against lithium metal, LiCoO 2 The actual capacity can reach about 150 mAh / g, spinel LiMn 2 o 4 The actual capacity can be about 120 mAh / g, LiFePO with olivine structure 4 The capacity can reach about 150 mAh / g. Generally speaking, increasing the charging voltage can further increase the available capacity of the material, but this will lead to serious damage to the material structure and may bring safety hazards. [0003] Among the above severa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王兆翔刘建永柳娜刘道坦陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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