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Compound material of anode fit for producing secondary battery and its produced battery

A technology for composite materials and secondary batteries, applied in secondary batteries, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problems of large particle size, uneven distribution, and slowness of compound powders, and achieve reduction The effect of material cost and simplification of process steps

Active Publication Date: 2009-11-25
ADVANCED LITHIUM ELECTROCHEMISTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the capacitance recorded in its examples can reach about 163mAh / g, its compound powder still has the disadvantage of large particle size and uneven distribution, so it cannot perform charge and discharge actions at high currents, and from its examples According to the data calculation, the charge and discharge rate of the battery is about 1 / 37C, which is still slow in actual use, so there is still room for improvement

Method used

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  • Compound material of anode fit for producing secondary battery and its produced battery
  • Compound material of anode fit for producing secondary battery and its produced battery
  • Compound material of anode fit for producing secondary battery and its produced battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0057] Add 0.2 moles of ferric nitrate to 200 milliliters (ml) of deionized water to dissolve, add 0.2 moles of phosphoric acid after it is completely dissolved, then add 100 ml of lithium hydroxide aqueous solution containing 0.2 moles in advance and mix to make the solution Medium lithium ion: iron ion: phosphate ion according to LiFePO 4 The metering ratio (1:1:1) is mixed, and after the complete mixing reaction, a metal ion containing Fe, Li + and (PO4) 3- The solution, and in the solution, add 100ml aqueous solution containing oxalic acid 0.252g again, after fully stirring, then this solution is dried, obtains a powdery starting material after drying.

[0058] The starting material is placed in an alumina crucible, and then the crucible is placed in a tubular furnace with charcoal, and it is heat-treated at 700°C for 12 hours under a nitrogen atmosphere. During the heat treatment, charcoal is produced at a high temperature The suspension of carbon particles is carried b...

Embodiment B

[0060] The preparation method of Example B is roughly the same as that of Example A, the difference is that ferric nitrate is replaced by 0.2 mole of ferric chloride and dissolved in deionized water, and the rest of the steps are the same as in Example A to obtain a Composite powder of lithium iron phosphate as matrix and mixed with carbon.

Embodiment C

[0062] Example C is roughly the same as Example A. The difference is that ferric nitrate is replaced by 0.2 mole iron powder and dissolved in deionized water. The rest of the steps are the same as in Example A to prepare a phosphoric acid Composite powder of lithium-iron matrix mixed with carbon.

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Abstract

The invention relates to a composite material suitable for making positive electrodes of secondary batteries and the batteries made therefrom. The composite material suitable for making the positive electrode of the secondary battery is in powder form and has an olivine structure or a NASICON structure. Secondary particles with a diameter greater than 1 micron. The secondary battery includes a negative electrode, an electrolyte and a positive electrode made of a composite material, the composite material is in powder form and has an olivine structure or a NASICON structure, and the composite material powder has a particle size ranging from 10 to 500 Nano primary particles, and secondary particles formed from primary particles with a particle size greater than 1 micron. The invention can greatly increase the specific surface area of ​​the material, increase the electric capacity, and at the same time has the advantages of convenient manufacture, and the formed battery has high charging and discharging rate, high electric capacity, and reduces overcharging or overdischarging to prolong the battery life.

Description

technical field [0001] The invention relates to a material suitable for making positive electrodes of batteries and batteries, in particular to a material that can greatly increase the specific surface area of ​​the material, increase the capacity, and is convenient to manufacture, and the formed battery has a high charge and discharge rate, high Capacitance, and reducing overcharge or overdischarge to increase battery life can be used to make the composite material of the positive electrode of the secondary battery and the battery made therefrom. Background technique [0002] With the diversified development of electronic products, the demand for portable energy is increasing day by day, such as consumer electronics, medical equipment, electric bicycles, electric vehicles, electric hand tools, etc., all need portable power as their power source . At present, reusable secondary batteries are widely used in portable energy sources. Among the existing types of secondary batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/48H01M4/58C01B25/45H01M10/40H01M4/136H01M4/36H01M4/62
CPCH01M4/5825H01M4/625H01M4/136H01M10/052H01M4/621H01M4/1397Y02E60/122Y02E60/10B82Y30/00H01M4/13H01M4/38H01M4/58
Inventor 杨智伟
Owner ADVANCED LITHIUM ELECTROCHEMISTRY CO LTD
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