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A kind of lithium-supplementing cathode material containing CO-doped lithium ferrate and its preparation and application

A positive electrode material, lithium ferrite technology, applied in battery electrodes, structural parts, secondary battery repair/maintenance, etc., can solve the problems affecting Li electrochemical performance, harsh sintering process conditions, low electronic conductivity, etc., to achieve improvement Electrochemical performance, improved electrical performance, high activity effect

Active Publication Date: 2021-03-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently reported preparation of traditional Li 5 FeO 4 The sintering process conditions are harsh, and the synthesized Li 5 FeO 4 Large particle size and low electronic conductivity affect the Li 5 FeO 4 electrochemical performance and its application

Method used

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  • A kind of lithium-supplementing cathode material containing CO-doped lithium ferrate and its preparation and application
  • A kind of lithium-supplementing cathode material containing CO-doped lithium ferrate and its preparation and application
  • A kind of lithium-supplementing cathode material containing CO-doped lithium ferrate and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A Co-doped Li 5 FeO 4 Lithium supplement Li 5 Fe 1-x co x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0069] 1. Li 5 Fe 1-x co x o 4 Preparation of:

[0070] (1) Fe(CH 3 COO) 2 、C 4 h 6 CoO 4 4H 2 O and Li 2 CO 3 According to 9:1:50, it was dispersed in 80mol% citric acid aqueous solution containing Fe element and stirred at a speed of 300r / min for 6h, and NH was added during the process. 4 Adjust the pH to 9 with OH, and heat up to 80°C to obtain a gel;

[0071] (2) Dry the gel obtained in step (1) in a vacuum at 70°C, and then ball mill it at a speed of 200r / min for 1 hour to obtain a uniform precursor;

[0072](3) Place the precursor obtained in step (2) in an inert atmosphere and sinter at 650°C for 24 hours, and after cooling, the initial charge capacity is 465mAh g -1 , the first charge and discharge efficiency is 9%, the particle size is 9μm,

[0073] The specific surface are...

Embodiment 2

[0081] A Co-doped Li 5 FeO 4 Lithium supplement Li 5 Fe 1-x co x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0082] 1. Li 5 Fe 1-x co x o 4 Preparation of:

[0083] (1) Fe(CH 3 COO) 2 、C 4 h 6 CoO 4 4H 2 O and Li 2 CO 3 According to 11:1:60, it was dispersed in 90mol% citric acid aqueous solution containing Fe element and stirred at a speed of 350r / min for 7h, and NH was added during the process. 4 Adjust the pH to 9 with OH, and heat up to 80°C to obtain a gel;

[0084] (2) Dry the gel obtained in step (1) in a vacuum at 70°C, and then ball mill it at a speed of 250r / min for 1.5h to obtain a uniform precursor;

[0085] (3) Place the precursor obtained in step (2) in an inert atmosphere and sinter at 700°C for 36 hours, and after cooling, the initial charge capacity is 537mAh g -1 , the first charge and discharge efficiency is 8%, the particle size is 7μm, and the specific surface area is 3...

Embodiment 3

[0093] A Co-doped Li 5 FeO 4 Lithium supplement Li 5 Fe 1-x co x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0094] 1. Li 5 Fe 1-x co x o 4 Preparation of:

[0095] (1) Fe(CH 3 COO) 2 、C 4 h 6 CoO 4 4H 2 O and Li 2 CO 3 According to 13:1:70, it was dispersed in 100mol% citric acid aqueous solution containing Fe element and stirred at a speed of 400r / min for 8h, and NH was added during the process. 4 Adjust the pH to 9 with OH, and heat up to 80°C to obtain a gel;

[0096] (2) Dry the gel obtained in step (1) in vacuum at 70°C, and then ball mill it at a speed of 300r / min for 2h to obtain a uniform precursor;

[0097] (3) Place the precursor obtained in step (2) in an inert atmosphere and sinter at 750°C for 48 hours, and after cooling, the initial charge capacity is 645mAh g -1 , the first charge and discharge efficiency is 4%, the particle size is 5μm, and the specific surface area is 560m...

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Abstract

The invention belongs to the field of lithium ion battery materials, and particularly discloses a lithium supplementing cathode material containing Co-doped lithium ferrate. The lithium supplementingcathode material comprises a cathode active material and a lithium supplementing additive, wherein the lithium supplementing additive is Co-doped lithium ferrate or a composite lithium supplementing material formed by the Co-doped lithium ferrate and a carbon material; the chemical formula of the Co-doped lithium ferrate is Li5Fe1-xCoxO4, wherein x ranges from 0.05 to 0.1. The invention also provides a preparation method of the lithium supplementing additive. The method comprises the following steps of: dispersing an iron source, a cobalt source and a lithium source in a stoichiometric ratio in a solution dissolved with citric acid, performing stirring to react to obtain gel, performing drying, and performing ball milling to obtain a precursor; and sintering the precursor in a protective atmosphere at a temperature of 600-900 DEG C to obtain a catalyst. According to the invention, the lithium supplementing additive and the cathode active material are found to have synergism, and in addition, the invention also provides a preparation method which is simple to operate, short in preparation period and high in product activity.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a lithium replenishing agent, a preparation method of a lithium ion battery and the lithium ion battery. Background technique [0002] Lithium Ion Battery (Lithium Ion Battery, LIB) will have the problem of initial capacity loss (Initial Capacity Loss, ICL) due to the formation of SEI film when the negative electrode material is charged and discharged for the first time. ICL has a great impact on performance indicators such as energy density of the battery. Therefore, it is of great significance to develop simple and efficient lithium supplementation technology. [0003] At present, the main method of lithium supplementation is negative electrode lithium supplementation, which can be subdivided into primary battery lithium supplementation technology and auxiliary anode lithium supplementation technology according to the principle. However, the research results ...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 张治安赖延清王大鹏李煌旭洪波张凯李劼
Owner CENT SOUTH UNIV
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