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A kind of lifepo4-v2o5-graphene composite cathode material and its preparation method

A composite positive electrode material, V2O5 technology, applied in the field of high-performance lithium iron phosphate composite materials and its preparation, can solve the problems of low electrical conductivity, limit the development of high specific energy lithium ion batteries, low specific capacity, etc., and achieve the suppression of electrode structure damage , good flexibility and elasticity, the effect of good electrical conductivity

Active Publication Date: 2018-11-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiFePO 4 The theoretical specific capacity of the material is 170 mAh g -1 , the actual specific capacity is generally 130~140 mAh·g -1 , which is far lower than the specific capacity of negative electrode materials, which limits the development of high specific energy lithium-ion batteries
[0004] However, while addressing LiFePO 4 The two major defects of low conductivity and low specific capacity are huge technical problems. Searching the current public information is still blank

Method used

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  • A kind of lifepo4-v2o5-graphene composite cathode material and its preparation method
  • A kind of lifepo4-v2o5-graphene composite cathode material and its preparation method
  • A kind of lifepo4-v2o5-graphene composite cathode material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] For Nano LiFePO 4 The two major defects of low electrical conductivity and low specific capacity of the material, through the relationship with V 2 o 5 With the compound of Graphene, this embodiment provides a kind of LiFePO 4 -V 2 o 5 ―Graphene composite cathode material and its preparation method, using its outstanding synergistic effect, exerts excellent comprehensive electrochemical performance.

[0040] The LiFePO provided by this embodiment 4 -V 2 o 5 ―Graphene composite cathode material is made of LiFePO 4 Nanoparticles, V 2 o 5 A composite material composed of nanowires and Graphene nanosheets with a mass ratio of 6:3:1, and its structural characteristics are LiFePO 4 nanoparticles and V 2 o 5 LiFePO composed of nanowires uniformly supported on the surface of Graphene nanosheets 4 Nanoparticles—V 2 o 5 Nanowire - Graphene nanosheet multi-dimensional heterogeneous nanostructure, its preparation method is as follows:

[0041] (1) Add natural graphi...

Embodiment 2

[0047] The difference between this example and Example 1 is that in step (4), the three components are mixed with LiFePO 4 :V 2 o 5 :Graphene=7:2:1 weight ratio mixed and ultrasonicated at 140W for 8 hours. During ultrasonication, LiFePO 4 nanoparticles and V 2 o 5 Nanowires will spontaneously assemble on the exposed surface of Graphene nanosheets to reduce the free energy of the whole system, resulting in a weight ratio of three components of 7:2:1 (LiFePO 4 :V 2 o 5 :Graphene) LiFePO 4 Nanoparticles—V 2 o 5 Nanowire-Graphene nanosheet composite cathode material.

Embodiment 3

[0049] The LiFePO provided by this embodiment 4 -V 2 o 5 ―Graphene composite cathode material is made of LiFePO 4 Nanorods, V 2 o 5 A composite material composed of nanowires and Graphene nanosheets with a mass ratio of 6:3:1, and its structural characteristics are LiFePO 4 Nanorods and V 2 o 5LiFePO composed of nanowires uniformly supported on the surface of Graphene nanosheets 4 Nanorod-V 2 o 5 Nanowire—Graphene nanosheet multi-dimensional heterogeneous nanostructure, its preparation method is different from Example 1 in steps (2) and (4), which are described in detail as follows:

[0050] (2) Add 0.34 mL of 85% H to 20 mL of ethylene glycol solution 3 PO 4 and 1.389g FeSO 4 7 hours 2 O, after ultrasonication for 30 minutes, add 0.5238g LiOH·H 2 O, stirred for 20 minutes, transferred to a polytetrafluoroethylene autoclave, and heated at 200 ° C for 14 hours. The obtained product was washed with deionized water, added to tetrahydrofuran and ultrasonicated to obt...

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Abstract

The invention discloses a LiFePO<4>-V<2>O<5>-Graphene composite positive electrode material and a preparation method therefor. The composite positive electrode material comprises three kinds of nanomaterials of LiFePO<4>, V<2>O<5> and graphene at the weight ratio of 5-8 to 1-4 to 1, wherein the LiFePO<4> and the V<2>O<5> are deposited on the surface of the graphene. The lithium iron phosphate based composite positive electrode material can overcome shortcomings of other materials by taking full advantages of unique characteristics of various kinds of materials to show a prominent synergistic effect; and based on the high synergistic effect on functions and appearances, the specific capacity of the LiFePO<4>-V<2>O<5>-Graphene composite positive electrode material still can be 140 mAh.g<-1> under 2C after circulation for 100 times, so that the composite positive electrode material can be used as an excellent positive electrode material for the lithium ion battery. In addition, an ultrasonic-assisted liquid phase self-assembly method is adopted, so that the composite positive electrode material has the characteristics of low cost and stable structure; and furthermore, the appearances, the load density and distribution of the nanomaterials can be accurately controlled.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a high-performance lithium iron phosphate composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the main driving power sources for portable electronic devices, power tools and electric vehicles. With the vigorous development of these electrical appliances, the safety performance and electrochemical performance of lithium-ion batteries are also required to be higher and higher. Lithium iron phosphate (LiFePO 4 ) battery is currently a high-profile commercial lithium-ion battery, due to the introduction of high stability PO 4 Polyanionic groups have good thermal stability and safety, while iron and phosphorus elements have the advantages of abundant reserves, low price and environmental friendliness, so the LiFePO 4 The research boom of lithium-ion batteries. [0003] Current constraints on LiFePO 4 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/48H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/483H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 朱晓东孙克宁马汝甲高啸天
Owner HARBIN INST OF TECH
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