Graphite alkene iron lithium phosphate positive active material, preparing method thereof, and lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material

A cathode active material, graphene modification technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of low conductivity, limited direct application, etc., to achieve good conductivity, excellent cycle stability, high The effect of rate charge and discharge performance

Inactive Publication Date: 2010-06-23
宁波艾能锂电材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that lithium iron phosphate material has outstanding advantages in power lithium-ion batteries due to its high energy density and high safety performance, but its low conductivity limits the direct application of the material, which requires modification and doping other means to improve performance

Method used

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  • Graphite alkene iron lithium phosphate positive active material, preparing method thereof, and lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material
  • Graphite alkene iron lithium phosphate positive active material, preparing method thereof, and lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material
  • Graphite alkene iron lithium phosphate positive active material, preparing method thereof, and lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The first step, the preparation of graphene

[0026] Graphite is placed in a strong oxidant and stirred for 2-8 hours under the heat of reaction to obtain graphite oxide. Washing with water to pH=4-5, exfoliating graphite oxide single layer by stirring, shaking, ultrasonic and other means to obtain graphene oxide. Graphene is then obtained by reducing graphene oxide. Wherein the strong oxidant can be a mixed system of potassium permanganate, concentrated sulfuric acid, potassium nitrate, or a mixed system of fuming nitric acid and sodium chlorate (or potassium chlorate), or a mixed system of fuming nitric acid, concentrated sulfuric acid and sodium chlorate (or potassium chlorate) mixed system. The reduction can be realized by using a water-soluble strong reducing agent (such as hydrazine hydrate, sodium borohydride, etc.) in the aqueous phase, or by high-temperature annealing.

[0027] The second step, the preparation of lithium iron phosphate

[0028] Preparation ...

Embodiment 1

[0038] In the first step, 1.2 g of potassium nitrate was weighed, added to 46 ml of concentrated sulfuric acid (96-98wt.%), 1.0 g of graphite was added thereto, and after mixing evenly, 6.0 g of potassium permanganate was slowly added under stirring. The system was then heated to 40°C and stirring was continued for 6 hours. Then 80 ml of water was slowly added dropwise, while the temperature of the system was raised to 70° C. and kept stirring for 30 minutes. Add 200ml of water and 6ml of hydrogen peroxide (30%), and stop stirring after 5 minutes. After the graphite oxide particles settle, remove the supernatant. Add water to the primary product and wash it several times until the pH value of the system reaches about 5 to obtain a pure graphite oxide mother liquor. The graphite oxide mother liquor was ultrasonically treated for 2 hours to obtain a single-layer exfoliated graphene oxide sol.

[0039] In the second step, according to the stoichiometric ratio, a certain amount...

Embodiment 2

[0043] The first step is the same as the first step in Example 1, and a graphene oxide sol is prepared.

[0044] In the second step, ferrous salt (such as ferrous oxalate), lithium salt (such as lithium chloride) and phosphorus source (such as ammonium dihydrogen phosphate) are dissolved in the aqueous solution according to the stoichiometric ratio, and stirred at room temperature until it is a uniform sol, Elevate the temperature and age until it becomes a gel. After drying, it is annealed at high temperature (400-700° C.) and protected by argon for 4-20 hours to obtain a lithium iron phosphate material.

[0045] Subsequent steps are the same as the third and fourth steps in Example 1.

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Abstract

The present invention relates to graphite alkene iron lithium phosphate positive active material, a preparing method thereof, and a lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material. Graphite alkene and iron lithium phosphate are dispersed into water solution to be mixed evenly by stirring and ultra audible sound, then, are dried to obtain iron lithium phosphate material compounded by the graphite alkene and the iron lithium phosphate to be annealed by high temperature, and finally, the graphite alkene modified iron lithium phosphate positive active material is obtained. Compared with traditional carbon coated and conductive polymeric adulteration modified lithium batteries, the lithium ion twice battery based on the graphite alkene modified iron lithium phosphate positive active material has the advantages of high battery capacity, good charging-discharging circulating performance, long life and high circulating stability, and has great utility value.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and specifically relates to a novel graphene-modified lithium iron phosphate positive electrode active material with excellent rate performance and high cycle stability, and a high-performance lithium-ion secondary battery based on the material and its Preparation. Background technique [0002] With the depletion of traditional fossil energy and the increasing emphasis on environmental protection, people's demand for new green and efficient energy is increasingly urgent. As a new energy source with a strong competitive advantage, lithium-ion batteries have received special attention. In addition to their wide application in existing small portable batteries, the development prospects of lithium-ion batteries in high-power and high-energy power batteries are even more impressive. people look forward to. Electrode materials are key factors affecting the performance of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCH01M4/5825H01M4/133H01M4/1393Y02E60/122H01M10/052H01M4/139H01M4/13H01M4/587C01B25/45Y02E60/10
Inventor 刘兆平周旭峰杨石榴
Owner 宁波艾能锂电材料科技股份有限公司
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