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High power lithium ion battery and method for preparing amorphous carbon coated anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low internal resistance and achieve good conductivity, high-rate discharge capacity, and ion diffusion The effect of distance shortening

Inactive Publication Date: 2006-06-21
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the resistance of the plate, a large amount of conductive agent is generally added, such as adding 10wt% or more acetylene black, but in order to ensure the bonding strength, a large amount of binder must be added at the same time, which has no effect on reducing the internal resistance. Big, but half the effort

Method used

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  • High power lithium ion battery and method for preparing amorphous carbon coated anode material
  • High power lithium ion battery and method for preparing amorphous carbon coated anode material
  • High power lithium ion battery and method for preparing amorphous carbon coated anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, see Figure 1-3 : Make A1, A2, A3, B1, B2 according to following specific scheme, 5 kinds of batteries are compared, and the preparation process of A1, A2, A3, B1 is:

[0026] Preparation of lithium cobalt oxide with core-shell structure: firstly, an aqueous solution of white sugar was prepared. That is, 200g of edible pure white sugar is dissolved in 300ml of deionized water to make a transparent white sugar aqueous solution. The second is hanging sugar, that is, 200g of primary balls with an average D50 particle size of 2, 5, 10, 15 microns LiCoO 2 The powder was added to the above-mentioned white sugar aqueous solution, stirred with a high-speed mixer with a rotation speed of 300 rpm for 30 minutes, then the excess white sugar aqueous solution was filtered off by suction, and dried in air at 60°C for 3 hours. The next step is carbonization into a shell, that is, drying the dried hanging sugar LiCoO 2 Put it in a tunnel furnace, blow Ar gas for 1 hour to...

Embodiment 2

[0051] Example 2, A1, A4, A5, B3, B4 were produced according to the following specific scheme, and five kinds of batteries were compared. The preparation process of A1, A4, A5, and B3 was as follows:

[0052] Preparation of lithium cobalt oxide with core-shell structure: firstly, an aqueous solution of white sugar was prepared. That is, 200g of edible pure white sugar is dissolved in 300ml of deionized water to make a transparent white sugar aqueous solution. The second is hanging sugar, that is, 200g of primary balls with an average D50 particle size of 2 microns LiCoO 2 The powder was added to the above-mentioned white sugar aqueous solution, stirred with a high-speed mixer with a rotation speed of 300 rpm for 30 minutes, then the excess white sugar aqueous solution was filtered off by suction, and dried in air at 60°C for 3 hours. The next step is to carbonize into a shell, that is, put the dried hanging sugar in a tunnel furnace, and replace the air in the chamber with Ar...

Embodiment 3

[0076] Example 3, A1, A6, A7, A8, B5, and B6 were produced according to the following specific schemes, and five kinds of batteries were compared, and the preparation process of A1, A6, A7, and B8 was as follows:

[0077] Preparation of lithium cobalt oxide with core-shell structure: firstly, an aqueous solution of white sugar was prepared. That is, 200g of edible pure white sugar is dissolved in 300ml of deionized water to make a transparent white sugar aqueous solution. The second is hanging sugar, that is, 200g of primary balls with an average D50 particle size of 2 microns LiCoO 2 The powder was added to the above-mentioned white sugar aqueous solution, stirred with a high-speed mixer with a rotation speed of 300 rpm for 30 minutes, then the excess white sugar aqueous solution was filtered off by suction, and dried in air at 60°C for 3 hours. The next step is to carbonize into a shell, that is, put the dried hanging sugar in a tunnel furnace, and replace the air in the ch...

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Abstract

The invention relates to a method for high-power lithium ion cell and amorphous-carbon to coat positive material. Wherein, the cell positive shell comprises a positive active material with shell-nucleus structure; the shell structure has amorphous material while the nucleus is spherical material with D50 size less than 10ª–m; the negative electrode comprises active material and carbon fiber, and the dual-surface coating weight for positive and negative active materials is 10-30mg / cm2 and 4.8-14.5mg / cm2 respectively. The method for amorphous-carbon comprises: 1) dipping the positive material into sweet water; 2) stirring, filtering; 3) drying; 4) carbonizing in inert gas atmosphere at 600-1000Deg; 5) breaking and screening. This invention reduces internal resistance of electrode, increases discharge property of cell, and economical to process.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a high-power lithium-ion battery and a method for preparing amorphous carbon-coated cathode materials. Background technique [0002] Compared with traditional secondary batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride, lithium-ion batteries currently known have the advantages of high specific energy and low self-discharge, and have been widely used in mobile phones, notebook computers, cameras, etc. electronic appliances. Recently, with the increase in performance of hybrid vehicles and various boosters, there is an urgent need for a high-power battery that can be used in the above-mentioned system. A typical battery that can meet the above requirements is a lithium ion battery. [0003] A lithium-ion battery consists of a negative plate, a positive plate, an electrolyte, and a separator interposed between the positive and negative plates to p...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/10
Inventor 刘兴江张遥喻津汉吴滨成朱广焱杨凯
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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