Method for preparing graphene-doped anode material for lithium-ion batteries

A lithium-ion battery and positive electrode material technology, applied in the nanometer field, can solve the problems of high cost of carbon nanotube preparation, unfavorable development and cost performance, etc., and achieve the effect of improving electronic conductivity, low cost, and high capacity

Active Publication Date: 2010-08-11
苏州格瑞丰纳米科技有限公司
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Problems solved by technology

However, the high cost of preparation of carbon nanotubes is not conducive to the development of cost-effective lithium-ion battery materials

Method used

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  • Method for preparing graphene-doped anode material for lithium-ion batteries
  • Method for preparing graphene-doped anode material for lithium-ion batteries
  • Method for preparing graphene-doped anode material for lithium-ion batteries

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preparation example Construction

[0025]The preparation method of the positive electrode material of this kind of lithium ion battery, wherein the main component of the positive electrode material is lithium iron phosphate nanoparticles, and its preparation method steps mainly include: I, prepare graphene, graphene oxide and intercalated graphene; II, combine two Valence or trivalent iron salt, reducing agent, lithium salt and phosphoric acid are mixed in the dispersion liquid as raw materials, and the method of hydrothermal, co-precipitation, or sol-gel is used to prepare lithium iron phosphate nanoparticles; III, graphene, The synthesis process of graphene oxide and intercalated graphene compositely mixed with lithium iron phosphate nanoparticles, or directly mixing lithium iron phosphate nanoparticles with graphene, graphene oxide and intercalated graphene, drying, filtering, washing, and then Drying and annealing treatment, synthesis of graphene oxide, graphene bridge or coated lithium iron phosphate nanopa...

Embodiment 1

[0034] Graphite powder is oxidized by concentrated sulfuric acid, potassium permanganate and phosphorus pentoxide, washed with deionized water to neutrality, then deeply oxidized by concentrated sulfuric acid and potassium permanganate, and the reaction is terminated by adding a large amount of deionized water and a certain amount of hydrogen peroxide , washed again to neutral with deionized water. Obtain graphite oxide. Graphite oxide is ultrasonically dispersed to obtain a thin layer of graphene oxide.

[0035] Hydrothermal synthesis of graphene-coated LiFePO 4 The nanoparticle method is as follows, the initial raw material is LiOH·H 2 O, FeSO 4 ·7H 2 O, H 3 PO 4 , graphite oxide aqueous solution and L-(+)-ascorbic acid (vitamin C) as reducing agents. Accurately weigh 630mg of LiOH·H 2 O in a beaker, add 5mL deionized water, stir until completely dissolved. Then measure 0.34mL, 85% H 3 PO 4 In the solution, add 10mL graphite oxide aqueous solution (make the carbon...

Embodiment 2

[0038] Under the protection of inert gas, micron graphite powder and metal halide FeCl 3 Mix well, seal it into a quartz glass container, put it into a high-temperature furnace after sealing, and heat it to 360°C to carry out the metal halide intercalation reaction. The reaction time is more than 72 hours. After taking out, the product is ground and cleaned to form intercalated graphite powder.

[0039] Hydrothermal synthesis of graphene-coated LiFePO 4 The nanoparticle method is as follows, the initial raw material is LiOH·H 2 O, aqueous solution containing intercalated graphite powder and L-(+)-ascorbic acid (vitamin C) as reducing agent. Accurately weigh 630mg of LiOH·H 2 O in a beaker, add 5mL deionized water, stir until completely dissolved. Then measure 0.34mL, 85% H 3 PO 4 In the solution, add 10 mL of aqueous solution mixed with intercalated graphite powder, successively weigh 100 mg of L-(+)-ascorbic acid and stir in the mixed solution so that Li:Fe:P=3:1:1 (mo...

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Abstract

The invention discloses a method for preparing a graphene-doped anode material for lithium-ion batteries. The main component of the anode material is lithium iron phosphate nanoparticles. The method comprises the following steps of: firstly preparing the graphene, graphene oxide, and intercalation graphene respectively; secondly, doping the mixture of the graphene, the graphene oxide and the intercalation graphene in the synthetic material of the lithium iron phosphate nanoparticles or directly mixing the lithium iron phosphate nanoparticles and the intercalation graphene, the graphene oxide,or chemically reduced graphene after the preparation of lithium iron phosphate nanoparticles; and finally, synthesizing the graphene or graphene oxide bridged or lithium iron phosphate nanoparticle-clad material after the treatment of drying, filtering, eluting, re-drying, and annealing. The lithium iron phosphate nanoparticles prepared by the method of the invention are characterized by the capability of greatly improving electron conductivity and providing the lithium-ion batteries anode material having the advantages of simple processing technique, low cost, high capacity and safety for lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a mixed system of graphene, graphene oxide and lithium iron phosphate nanoparticles as a positive electrode material of a lithium ion battery, belonging to the field of nanotechnology. Background technique [0002] New energy generation and storage technologies are of great significance for the sustainable development of modern society. New energy storage technologies require high performance, safety, low cost, and eco-environmental friendliness, and the development of new materials that meet the above requirements is one of the keys to solving the problem. [0003] In 1991, LiCoO was produced by Japan's SONY company. 2 A commercial lithium-ion battery in which carbon black is the cathode material and carbon black is the anode material. Since then, lithium-ion batteries have developed rapidly and currently have important applications in energy storage. Lithium-ion batteries are composed of positive an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/62
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 刘立伟李伟伟耿秀梅荣吉赞赵勇杰程国胜
Owner 苏州格瑞丰纳米科技有限公司
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