A kind of positive electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in the field of preparation of lithium iron phosphate cathode materials with a three-dimensional continuous three-dimensional conductive network structure, can solve the problems of high cycle performance and irreversible capacity, poor processing performance, etc., and achieves improved synthesis reaction efficiency, The effect of improving electrochemical performance and increasing specific capacity

Active Publication Date: 2020-04-21
湖南烯能新材料有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is just to overcome lithium-ion battery cathode material LiFePO 4 Disadvantages such as high discharge specific capacity, high rate performance, high cycle performance and irreversible capacity, and poor processing performance provide a preparation method for lithium iron phosphate cathode material with a three-dimensional continuous three-dimensional conductive network structure, that is, a three-dimensional continuous three-dimensional conductive network structure The lithium iron phosphate cathode material replaces the current limitation of only relying on conductive agents to improve conductivity, thereby improving the electronic conductivity and ionic conductivity of the lithium iron phosphate cathode material, in order to improve the specific discharge capacity and high discharge capacity of the lithium iron phosphate cathode material. The rate charge and discharge performance and cycle performance can reduce its irreversible capacity. The lithium iron phosphate cathode material prepared by this method has the characteristics of high specific capacity, excellent cycle performance, rate performance and safety performance, and is especially suitable for lithium ion power. Cathode materials for batteries

Method used

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  • A kind of positive electrode material of lithium ion battery and preparation method thereof
  • A kind of positive electrode material of lithium ion battery and preparation method thereof
  • A kind of positive electrode material of lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0035] A kind of graphene / LiFePO of three-dimensional continuous three-dimensional conductive network structure of the present invention 4 Composite cathode material, graphene-loaded active catalytic nanoparticles and one-dimensional nanowires are modified synergistically and synthesized by high-temperature solid-state catalysis of graphene / lithium iron phosphate lithium-ion battery cathode material.

[0036] Such as figure 1 As shown, the specific steps of this example are as follows:

[0037] (1) Add 2.5g of functionalized graphene to 500ml of ethanol solution, and ultrasonically disperse for 1~3h to form a stable dispersed suspension A;

[0038] (2) Dissolve 11.51g of active catalytic nano-nickel ion compound in 250ml of deionized water, and mix it with solution A, so that the active catalytic nano-ion can be oriented and anchored on the unsaturated sites and defects of graphene, through the reducing agent sodium borohydride The active catalytic nano-ions are reduced to m...

Embodiment 2

[0047] A kind of graphene / LiFePO of three-dimensional continuous three-dimensional conductive network structure of the present invention 4 Composite positive electrode material, active catalytic nanoparticle graphene and one-dimensional nanowire synergistically modified and synthesized graphene / lithium iron phosphate positive electrode material through high-temperature solid-state catalysis.

[0048] The specific steps of this example are as follows:

[0049] (1) Add 2.5g of functionalized graphene to 500ml of ethanol solution, and ultrasonically disperse for 1~3h to form a stable suspension A;

[0050] (2) Dissolve 16.56g of active catalytic nano-cobalt ion compound in 250ml of deionized water, and mix it with solution A, so that the active catalytic nano-ions are oriented and anchored on the unsaturated sites and defects of graphene to form solution B;

[0051] (3) Evenly mix solution B with 478.61g of iron phosphate, 126.81g of lithium carbonate and 5g of one-dimensional n...

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Abstract

The invention discloses a cathode material for a lithium ion battery and a preparation method of the cathode material. The invention provides a preparation method of a lithium iron phosphate cathode material with a three-dimensional continuous conductive network structure, namely the lithium iron phosphate cathode material with the three-dimensional continuous conductive network structure is usedfor replacing the limitation that only a conductive agent is used for improving the conductivity at present, so that the electronic conductivity and the ionic conductivity of the cathode material forthe lithium ion battery are improved in order to improve the specific discharge capacity, the high-rate charge-discharge capability and the cycling performance of the cathode material for the lithiumion battery, and irreversible capacity is reduced, and furthermore, the cathode material for the lithium ion battery, which is prepared by the method, has the characteristics of high specific capacityand excellent cycling performance, rate performance, safety performance and the like, and is especially suitable for being used as the cathode material of a lithium ion power battery.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a preparation method of a lithium iron phosphate positive electrode material with a three-dimensional continuous three-dimensional conductive network structure. Background technique [0002] LiFePO4, a cathode material for lithium-ion batteries, has the advantages of good safety performance, low price, high specific capacity, stable charge and discharge voltage platform, and long cycle life. However, due to the poor electronic conductivity and ionic conductivity of LiFePO4 itself, its high rate performance is poor, resulting in a low actual specific capacity (the actual specific capacity is about 100 mAh / g at 1C, while the theoretical specific capacity is 170 mAh / g. g) and low working voltage (the actual discharge voltage is below 3.0V at 1C, while the theoretical discharge voltage is 3.4V), and the capacity will drop rapidly du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 邓凌峰彭辉艳
Owner 湖南烯能新材料有限公司
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