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Silver electrode composite material of lithium secondary battery and low temp. preparation method thereof

A lithium secondary battery and composite electrode technology, applied in the field of electrochemical power supply, can solve the problems of wide particle size distribution, uneven distribution, inevitable melting and agglomeration of silver particles, etc. Effect

Inactive Publication Date: 2007-07-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its particle size is large and the particle size distribution range is wide, 50-500nm, and the distribution is uneven. It needs to be pyrolyzed to obtain metallic silver, which inevitably leads to the melting and agglomeration of silver particles under high temperature conditions.

Method used

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  • Silver electrode composite material of lithium secondary battery and low temp. preparation method thereof
  • Silver electrode composite material of lithium secondary battery and low temp. preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Will NH 4 OH solution and AgNO 3 0.01mol of [Ag(NH 3 ) 2 ]OH solution, then LiMn 2 o 4 matrix and [Ag(NH 3 ) 2 ]OH according to the molar ratio of 1:0.067 to make a solution and put it on a magnetic stirrer to stir evenly. 3 CHO solution until the reaction is complete, i.e. Ag + All reduced to metal. Filter and wash with distilled water and then dry to obtain 96wt% LiMn 2 o 4 / 4wt%Ag composite powder.

[0020] Grind the powder obtained by the above synthesis method into a slurry with acetylene black and polyvinylidene fluoride (PVDF) in a weight ratio of 85:7:8 in N-methylpyrrolidone (NMP) medium, and coat on the aluminum foil and dried, the film thus made is the positive electrode, the metal lithium foil is the negative electrode, the polypropylene film of Celgard Company of the United States is the diaphragm, and the LiPF 6 -PC+DMC (1:1) is the electrolyte, and the charge and discharge test is carried out. The first discharge capacity between 4.4-3V under ...

Embodiment 2

[0022] Will NH 4 OH solution and AgNO 3 0.01mol of [Ag(NH 3 ) 2 ]OH solution, then Li 4 Ti 5 o 12 Put the matrix into distilled water with a magnetic stirrer and stir evenly, and at a constant temperature of 80°C, slowly and constantly drop [Ag(NH 3 ) 2 ]OH and CH 3 CHO solution until the reaction is complete, that is, the prepared amount of Ag + All reduced to metal. After filtering and washing with distilled water, dry to obtain 96wt% Li 4 Ti 5 o 12 / 4wt%Ag composite powder. The electrode preparation method, battery assembly, and test conditions are the same as in Example 1. The charge and discharge test was carried out between 2.3-0.5V at 2C and 4C rates, and its first discharge capacity was 203.5 and 173.7mAh / g. The matrix compound Li prepared under the same conditions 4 Ti 5 o 12 The initial discharge capacity of the first discharge capacity of 162.2 and 150.7mAh / g, the first discharge capacity of the composite material containing the second phase silver w...

Embodiment 3

[0024] Will NH 4 OH solution and AgNO 3 0.01mol of [Ag(NH 3 ) 2 ]OH solution, and then LiCoO 2 matrix and [Ag(NH 3 ) 2 ]OH according to the molar ratio of 1:0.036 to prepare a solution and put it on a magnetic stirrer to stir evenly. Under the condition of a constant temperature of 80°C, drop CH 3 CHO solution until the reaction is complete, i.e. Ag + All reduced to metal. Filter and wash with distilled water and then dry to obtain 95wt% LiCoO 2 / 5wt% Ag composite powder. The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. The first discharge capacity between 4.4-3V at 1C and 10C rates is 175.8 and 136.5mAh / g, and the matrix compound LiCoO prepared under the same conditions 2 The initial discharge capacities of the composites were 137.6 and 113.1mAh / g, respectively, and the initial discharge capacities of the composites containing the second phase silver were 21.73% and 17.14% higher, respectively. For th...

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Abstract

This invention relates to a sliver composite material for negative electrode of lithium secondary battery and its low-temperature preparation method, belonging to the field of electrochemical power. It is to mix NH4OH and AgNO3 solution to prepare [Ag(NH3)2]OH solution, then put up various electrode materials and [Ag(NH3)2]OH according to the composition formula to prepare solution, mix equally, and then infuse CH3CHO into it slowly until the response completes. The compositions of the invention is (100-y) electrode materials / y silver particles, in which, (100-y) / y is weight ratio, y = 0.1 ~ 20, and silver particle size is less than 20nm. Preparation of this invention is simple and low-cost. The first discharge capacity of the two-phase composite material is respectively 122.8 and 123.6mAh / g in 4.4-3V of 1C and 10C ratio.

Description

technical field [0001] The invention relates to a silver composite electrode material for a lithium secondary battery and a low-temperature preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] Lithium-ion battery is a newly developed green energy in the 1990s, and it is also a high-tech industry supported by my country's energy field. The key to the development of lithium-ion batteries lies in the development of positive and negative electrode materials and electrolytes, especially the development of positive and negative electrode materials with excellent reversible lithium ion release. [0003] At present, the positive and negative electrode materials commonly used in lithium-ion batteries are carbon materials and LiCoO 2 , the anode materials under development mainly include Li 4 Ti 5 o 12 The cathode material is LiMn 2 o 4 , LiFePO 4 , LiM y mn 2-y o 4 (M=Co, Cr, Ni) or their modified systems. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/58H01M4/48H01M4/04B01J19/00H01M4/13H01M4/139H01M4/62
CPCY02E60/10
Inventor 温兆银黄莎华杨学林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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