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Preparation method of positive material of lithium-ion battery for portable game machine

A technology for lithium-ion batteries and game machines, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor storage performance, poor cycle performance, and high price, and achieve improved electrical conductivity, large cycle stability, and high energy effect of density

Active Publication Date: 2013-07-10
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion battery cathode materials mainly include LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and LiFePO 4 etc., currently used cathode materials have their own disadvantages: LiCoO 2 The price is high, the structure is unstable after the charging voltage exceeds 4.2V, and the safety becomes poor; LiNiO 2 The cycle performance of LiMn is not good, the water absorption is strong, and the storage performance is poor; LiMn 2 o 4 Lithium manganese oxide, a positive electrode material with good battery synthesis performance and stable structure, is the key to lithium-ion battery electrode materials. Lithium manganate is one of the more promising lithium-ion positive electrode materials, but its high-temperature cycle performance is poor, and it has a certain Solubility, poor storage performance, and poor electrochemical stability greatly limit its industrialization
Therefore, these cathode materials for lithium-ion batteries cannot meet the needs of lithium-ion batteries in terms of high specific capacity, long life, low cost and environmental compatibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh lithium tetrafluoroborate, vanadium pentoxide, ammonium phosphate and magnesium carbonate according to the molar ratio Li:V:P:Mg=2.7:2:3:0.3, and place the weighed solid material in a ball mill, Deionized water was added for wet ball milling to obtain a wet gel. Weigh yttrium oxide with the molar ratio of vanadium at 1%, dissolve it in ammonia water to obtain ammonium yttrium acid, heat it in a water bath at 60°C to remove excess ammonia water, add it to the above wet gel, and stir thoroughly to obtain yttrium doped The precursor of lithium vanadium magnesium phosphorus. The ball-milled mixture of the above precursors was calcined in a nitrogen atmosphere, first kept at 700°C for 7 hours, then at 900°C for 8 hours, and cooled to room temperature with the furnace to obtain the positive electrode active material.

[0031] The composite conductive agent is composed of porous carbon nanotubes and carbon black, the outer diameter of the porous nanotubes is 20-30nm, th...

Embodiment 2

[0039] According to the molar ratio of substances Li:V:P:Mg=2.9:2:3:0.1, weigh lithium tetrafluoroborate, vanadium pentoxide, ammonium phosphate and magnesium carbonate, and place the weighed solid materials in a ball mill, Deionized water was added for wet ball milling to obtain a wet gel. Weigh yttrium oxide with a vanadium molar ratio of 3%, dissolve it in ammonia water to obtain ammonium yttrium acid, heat it in a water bath at 80°C to remove excess ammonia water, add it to the above wet gel, and stir thoroughly to obtain yttrium-doped The precursor of lithium vanadium magnesium phosphorus. The ball-milled mixture of the above precursors was calcined in a nitrogen atmosphere, first kept at 800° C. for 5 hours, then at 1000° C. for 6 hours, and cooled to room temperature with the furnace to obtain a positive electrode active material.

[0040] The composite conductive agent is composed of porous carbon nanotubes and carbon black. The outer diameter of the porous nanotubes ...

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Abstract

The invention relates to a preparation method of a positive material of a lithium-ion battery for a portable game machine. The preparation method comprises the following steps of: (1) preparing a precursor of yttrium-doped lithium vanadium magnesium phosphorus, and calcining a mixture obtained after the precursor is ball-milled in nitrogen atmosphere to obtain a positive active material; (2) preparing a carbon conductive agent; (3) preparing positive slurry with N-methylpyrrolidone as a solvent, then adding the active material and the conductive agent to the slurry to be stirred to obtain slurry, and sieving the obtained slurry by a 200-mesh screen for 3-5 times; and (4) preparing a positive piece. The multi-element positive active material doped with a rare earth element, namely yttrium, is used to achieve great energy density and cycle stability, and a treated porous nanotube and the carbon black mixed conductive agent are added to the positive slurry, so that the conductivity of the positive material is improved.

Description

[0001] technical field [0002] The invention relates to the field of power supplies of portable game machines, in particular to a preparation method for a positive electrode of a lithium ion battery used in portable game machines. [0003] Background technique [0004] With the increasing popularity of portable game consoles represented by PSP, people have higher and higher performance requirements for portable game consoles. The most prominent performance is that the requirements for battery life of game consoles are getting higher and higher. It is hoped that the charging time of the battery can be saved, and the requirement for the repeated service life of the battery is also getting higher and higher. [0005] Lithium-ion battery Lithium-ion battery is a new generation of green and renewable chemical energy with excellent performance. It has high energy density and good cycle performance. It is the first choice for portable game console batteries. When selecting a bat...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/139
CPCY02E60/10
Inventor 严建泗
Owner WUHU ETC BATTERY LTD