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Method for modified cladding composite, anode material LiCoO* of lithium ion battery, and batteries

A technology for lithium ion batteries and positive electrode materials, applied in the field of material chemistry, can solve the problems of particle size and surface change, decrease in specific capacity of positive electrode materials, difficult to process and manufacture electrodes, etc., achieve or make up for inherent defects, improve inherent Defects, the effect of good application prospects

Active Publication Date: 2008-03-26
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these oxides and salts are insulating films, and their coating often leads to a decrease in the specific capacity of the positive electrode material after coating.
In addition, what is more serious is that the particle size and surface of the active material have changed greatly after coating, the processing behavior of the slurry has deteriorated, and it is difficult to process and manufacture electrodes.

Method used

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  • Method for modified cladding composite, anode material LiCoO* of lithium ion battery, and batteries
  • Method for modified cladding composite, anode material LiCoO* of lithium ion battery, and batteries
  • Method for modified cladding composite, anode material LiCoO* of lithium ion battery, and batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one, LiOH, HBO 3 , Al(NO 3 ) 3 Dissolve in water to prepare a 1% solution at a molar ratio of 2:1:1, and dry 100g LiCoO 2 Add the powder into 45g of the above solution, stir for 20min, then add 150g of PEO solution with a concentration of 1% and a molecular weight of 250,000, and continue stirring for 30min. Then, the slurry was heated at 70° C. and stirred while heating to evaporate water. Then the LiCoO 2 Put it into an oven at 60°C and bake for 6-8 hours, and then treat it in a calciner at 700°C for 6 hours to obtain the coated conductive glass layer of the present invention 0.5Li 2 O 0.25Al 2 o 3 0.25B 2 o 3 After LiCoO 2 Material. It can be clearly seen from Figure 1a and b that the coated LiCoO 2 Compared with LiCoO before coating 2 The particles are uniform and the surface is smooth.

Embodiment 2

[0035] Example 2: Dissolve 0.98gLiOH in 100g water and add 1.96gH 4 SiO 4 Stir, then add 14.3 g of 10% NH 3 ·H 2 O until completely dissolved. 200gLiCoO 2 The powder was added to the solution and stirred for 30 minutes, then heated at 80°C to evaporate the water. Then put the material into an oven at 80°C and bake for 10 hours. 100 g of a 3% polyacrylate solution was prepared with CMC as a solvent. Add the material to this solution and stir for 40 minutes, then heat to evaporate the solvent. Put the material into a calcination furnace and treat it at 900 ° C for 8 hours to obtain the coated conductive glass layer of the present invention 0.5Li 2 O 0.5SiO 2 After LiCoO 2 Material.

Embodiment 3

[0036] Embodiment three, 1.47gLiOH is dissolved in 100g water, then add 1.47gH 4 SiO 4 Stir until completely dissolved, then add 6.25g Al(NO 3 ) 3 . After dissolving, add 200g LiCoO to this solution 2 Stir the powder for 20min, add 10% NH 3 ·H 2 O 31g was continued to stir for 30min, and then 200g of 1.3% PEO solution was added to continue to stir for 30min. After that, the water was evaporated by heating at 60°C. Put it in an oven at 100°C and bake it for about 8 hours, then put it in a calciner and treat it at 900°C for 8 hours to get the coated conductive glass layer of the present invention 0.5Li 2 O 0.25Al 2 o 3 0.25SiO2 2 After LiCoO 2 Material.

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Abstract

The composite material is LiCoO2 powdered material with surface being coated by conductive glass layer. The method includes steps: (1) mixing the said powdered material with solution capable of generating oxide or conductive glass layer for coating surface of the powdered material; (2) adding solution of organic high molecular material to admixture in step (1) or after step (1); (3) after procedures of de-watering, firing and calcining the admixture so as to obtain coated LiCoO2. The battery includes positive pole made from the disclosed composite material. The organic high molecular material not only disperses material to be coated, but also plays function of binder so that oxide or conductive glass layer can be dispersed in solution evenly and can coat on surface of LiCoO2 powdered material evenly. The invention raises thermal stability and reserves good process performance.

Description

【Technical field】 [0001] The invention relates to the field of material chemistry and high-energy battery technology, in particular to a composite, lithium-ion battery cathode material LiCoO 2 The modified coating method and the battery prepared by the method. 【Background technique】 [0002] A rechargeable lithium-ion battery that uses a graphite-like carbon material that can intercalate and extract lithium ions as the negative electrode, a transition oxide as the positive electrode, and a non-aqueous organic solvent lithium salt solution as the electrolyte is a mobile phone and portable electronic product in the digital age, such as : The main power supply of notebook computers, PDAs, digital cameras, digital cameras and electric tools, etc., has the characteristics of high energy density, high working voltage, long cycle life, no memory effect and high environmental protection. [0003] At present, lithium-ion batteries have developed into an industry with annual sales of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04H01M4/62C01D15/00C01G51/00H01M4/525H01M10/0525
CPCY02E60/12Y02E60/10
Inventor 林云青张娜
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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