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Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof

A technology of lithium iron phosphate and battery positive electrode, which is applied in the field of graphene lithium iron phosphate battery positive electrode composite materials and its preparation, and can solve the problems of complex surface coating process, low conductivity, and high price

Inactive Publication Date: 2014-06-18
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide graphene lithium iron phosphate battery positive electrode composite material, solves the problem that existing lithium ion battery positive electrode material conductivity is low, surface cladding process is complex, expensive

Method used

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  • Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof
  • Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof
  • Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof

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Embodiment 1

[0026] Embodiment one: using lithium carbonate LiCO 3 , ferrous oxalate FeC 2 o 4 2H 2 O, diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 and glucose C as the coated carbon source 6 h 12 o 6 As raw materials, the above substances were weighed according to the stoichiometric molar ratio of 1.0:1.0:1.0:0.2, and the pure phase LiFePO was carried out by high temperature solid phase method. 4 preparation. Put the weighed material into the ball mill mixer, mix according to material: ball: alcohol 1:1.8:1.2 for 3 hours, put the material into the drying oven and dry at 120°C after discharging. The tube furnace was evacuated with an air pump, and N 2 , keep the nitrogen pressure at about 0.11MPa, set the slow heating program to 700°C, and hold for 8 hours. Synthesis of carbon-coated pure-phase LiFePO under high temperature and high pressure 4 . figure 2 The synthesized pure-phase LiFePO can be seen in 4 X-ray diffraction pattern.

[0027] Graphite (graphene) / LiFePO 4 Pre...

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Abstract

The invention discloses a composite positive electrode material of a graphene and lithium iron phosphate battery and a preparation method thereof. The composite positive electrode material of the graphene and lithium iron phosphate battery is composed of graphene and a LiFePO4 lithium ion battery positive electrode material in the mass percentage range of 0.1%-8%. The composite material sufficiently utilizes the good conductive performance of the graphene so that the electronic conductivity and the discharging rate capability of the positive electrode material of the lithium iron phosphate ion battery are improved; a graphene filling process is simple and the price is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery production, and relates to a graphene lithium iron phosphate battery cathode composite material and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium-ion battery has the characteristics of high specific capacity, high voltage and good safety. The main component of lithium-ion battery is lithium iron phosphate (LiFePO 4 ), there is no volume change during the extraction and insertion of lithium ions, no active oxygen is released at high temperatures, and it has excellent charge-discharge cycle and safety. The main component of electric vehicle power battery research. Currently LiFePO 4 The industrialization process has encountered some difficulties, including: ①LiFePO 4 The electrical conductivity is low, and it is only suitable for discharging at a small current density. ②Fe2valent iron ions are easily oxidized, and strict contr...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122H01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 杨洪朱朝宽
Owner CHONGQING TECH & BUSINESS UNIV
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