Synergistically modified lithium-iron-phosphate positive active material enveloped with graphene three-dimensional network and doped with metal ions and preparation method of lithium-iron-phosphate positive active material

A cathode active material, lithium iron phosphate technology, applied in battery electrodes, electrical components, circuits, etc., to reduce polarization effect, improve electrical conductivity, and excellent charge-discharge cycle performance.

Inactive Publication Date: 2013-04-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to overcome the existing technology only through doping or surface coating modification to improve LiFePO 4 To provide a fast, simple, low-cost preparation, and lar

Method used

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  • Synergistically modified lithium-iron-phosphate positive active material enveloped with graphene three-dimensional network and doped with metal ions and preparation method of lithium-iron-phosphate positive active material
  • Synergistically modified lithium-iron-phosphate positive active material enveloped with graphene three-dimensional network and doped with metal ions and preparation method of lithium-iron-phosphate positive active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Weigh Li 2 CO 3 , FeC 2 o 4 2H 2 O, MnCO 3 , NH 4 h 2 PO 4 Mix at a molar ratio of 1:0.6:1.4:2 and ball mill for 3 hours. The resulting mixture and acetylene black were mixed and ball milled at a weight ratio of 96:4. Then heat treatment at 550°C for 24 hours in an argon atmosphere, cool to room temperature and grind to obtain metal manganese ion-doped lithium ferrous phosphate, that is, LiMn 0.7 Fe 0.3 PO 4 powder material. Weigh 0.035g graphene oxide, weigh 35ml isopropanol solution, and make a graphene oxide organic solution with a concentration of 1mg / ml; weigh 3.5gLiMn 0.7 Fe 0.3 PO 4 The powder material was dispersed into 1 mg / ml graphene oxide organic solution, stirred for 15 minutes, ultrasonicated for 30 minutes, and then rotary evaporated at 60°C to obtain graphene oxide / LiMn 0.7 Fe 0.3 PO 4 The mixture was annealed under the protection of high-purity argon at 600°C for 6 hours to obtain lithium iron phosphate modified by graphene three-dimens...

Embodiment 2

[0077] Weigh Li 2 CO 3 , FeC 2 o 4 2H 2 O, Ni(Ac) 2 4H 2 O, NH 4 h 2 PO 4 The molar ratio was 1:1.8:0.2:2, mixed and ball milled for 3 hours, and the obtained mixture was calcined at 550° C. for 8 hours under an argon atmosphere. Cool to room temperature and grind again to obtain metal nickel-doped lithium iron phosphate LiFe 0.9 Ni 0.1 PO 4 powder material. Weigh 0.01g of graphene oxide, weigh 10ml of absolute ethanol solution, and make a graphene oxide organic solution with a concentration of 1mg / ml; weigh 1g of LiFe 0.9 Ni 0.1 PO 4 The powder material was dispersed into a 1 mg / ml graphene oxide organic solution, stirred for 15 minutes, ultrasonicated for 30 minutes, and then evaporated on a rotary at 60°C to obtain graphene oxide / LiFe 0.9 Ni 0.1 PO 4 The mixture was annealed at 500° C. under the protection of high-purity argon for 8 hours to obtain lithium iron phosphate modified by graphene three-dimensional network enveloped metal nickel ions.

Embodiment 3

[0079] Weigh Li 2 CO 3 , FeC 2 o 4 2H 2 O, Co(Ac) 2 4H 2 O, NH 4 h 2 PO 4 The molar ratio was 1:1.8:0.2:2, mixed and ball milled for 3 hours, and the obtained mixture was calcined at 550° C. for 8 hours under an argon atmosphere. Cool to room temperature and grind again to obtain metal cobalt-doped lithium iron phosphate LiFe 0.9 co 0.1 PO 4 powder material. Weigh 0.07g graphene oxide, weigh 35ml aqueous solution, and make a graphene oxide organic solution with a concentration of 2mg / ml; weigh 1.5gLiFe 0.9 co 0.1 PO 4 The powder material was dispersed into a 2 mg / ml graphene oxide organic solution, stirred for 15 minutes, ultrasonicated for 30 minutes, and then evaporated at 60°C on a rotary basis to obtain graphene oxide / LiFe 0.9 co 0.1 PO 4 The mixture was annealed at 500° C. under the protection of high-purity argon for 8 hours to obtain lithium iron phosphate modified by graphene three-dimensional network enveloped metal cobalt ions.

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Abstract

The invention relates to a synergistically modified lithium-iron-phosphate positive active material enveloped with a graphene three-dimensional network and doped with metal ions and a preparation method of the lithium-iron-phosphate positive active material. The preparation method comprises the following steps of: dispersing graphene or graphene oxide together with lithium iron phosphate doped with the metal ions into a solution, mixing uniformly by agitation and ultrasound, drying to obtain a lithium iron phosphate material compounded with graphene or graphene oxide and doped with the metal ions, and then annealing at high temperature to obtain the synergistically modified lithium-iron-phosphate positive active material enveloped with the graphene three-dimensional network and doped with the metal ions. Compared with a traditional modified lithium battery enveloped with carbon and doped with conductive macromolecules, a lithium-ion secondary battery adopting the positive active material has the characteristics that the battery capacity is high, the charging and discharging cycle performance is excellent, the service life is long, the cycle stability is good, and the industrial application value is extremely great.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a graphene-like three-dimensional network envelope and metal ion doping synergistically modified lithium iron phosphate positive electrode active material and a preparation method thereof. Background technique [0002] The reduction of petroleum resources and the huge environmental pollution caused by the use of traditional energy have prompted countries all over the world to vigorously promote new energy vehicles. At present, the main development bottleneck of new energy vehicles is the development of safe and controllable power batteries. Lithium-ion batteries have the characteristics of high energy density, light weight, no pollution to the environment, no memory effect, stable working performance, safety and reliability that traditional power batteries do not have, and are the development direction of a new generation of power supplies. [0003] Electr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 郭守武吴海霞陆帮美
Owner SHANGHAI JIAO TONG UNIV
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