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Mn-doped lithium ferrate, lithium supplement positive electrode material and preparation and application thereof

A technology of lithium ferrate and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low electronic conductivity, large particle size, and potential safety hazards.

Active Publication Date: 2019-11-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research results show that the existing lithium supplementation technology has the following problems: the lithium supplementation current of the primary battery is uncontrollable, which has extremely high requirements on the production process and has potential safety hazards; the auxiliary anode supplementation of lithium is difficult for continuous production, and it is prone to safety hazards
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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  • Mn-doped lithium ferrate, lithium supplement positive electrode material and preparation and application thereof
  • Mn-doped lithium ferrate, lithium supplement positive electrode material and preparation and application thereof
  • Mn-doped lithium ferrate, lithium supplement positive electrode material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A Mn-doped Li 5 FeO 4 Lithium supplement Li 5 Fe 1-x mn x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0074] 1. Li 5 Fe 1-x mn x o 4 Preparation of:

[0075] (1) Fe 2 o 3 , MnC 2 o 4 2H 2 O. Li 2 CO 3 According to the molar ratio of 4.5:1:25, it is dispersed in dodecyl (hexa) alkyl trimethyl ammonium bromide (dodecyl (hexa) alkyl trimethyl ammonium bromide is Fe 2 o 3 2% of the mass) in deionized water for 1 h, and the ball milling speed is 200r / min;

[0076](2) Spray-dry the slurry obtained in step (1) at 160°C to obtain a uniformly mixed precursor, and the feed rate is 30ml / min;

[0077] (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 460mAh g -1 , the first charge and discharge efficiency is 10%, the particle size is 9μm, and the specific surface area is 240m 2 g -1 Li 5 Fe ...

Embodiment 2

[0086] A Mn-doped Li 5 FeO 4 Lithium supplement Li 5 Fe 1-x mn x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0087] 1. Li 5 Fe 1-x mn x o 4 Preparation of:

[0088] (1) Fe 2 o 3 , MnC 2 o 4 2H 2 O. Li 2 CO 3 According to the molar ratio of 5.5:1:25, it is dispersed in stearic acid containing stearic acid (stearic acid is Fe 2 o 3 4% of the mass) in deionized water for 2 hours, the ball milling speed is 250r / min;

[0089] (2) Spray-dry the slurry obtained in step (1) at 170°C to obtain a uniformly mixed precursor, and the feed rate is 25ml / min;

[0090] (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 of 550mAh·g is obtained. -1 , the first charge and discharge efficiency is 9%, the particle size is 7μm, and the specific surface area is 480m 2 g -1 Li 5 Fe 1-x mn x o 4 .

[0091] 2. LiC...

Embodiment 3

[0098] A Mn-doped Li 5 f e o 4 Lithium supplement Li 5 Fe 1-x mn x o 4 A preparation method for a lithium-ion battery supplemented with lithium, comprising the following steps:

[0099] 1. Li 5 Fe 1-x mn x o 4 Preparation of:

[0100] (1) Fe 2 o 3 , MnC 2 o 4 2H 2 O. Li 2 CO 3 According to the molar ratio of 6.5:1:25, it is dispersed in stearic acid containing stearic acid (stearic acid is Fe 2 o 3 6% of the mass) in deionized water for 3h, the ball milling speed is 300r / min;;

[0101] (2) spray-dry the slurry obtained in step (1) at 180°C to obtain a uniformly mixed precursor, and the feed rate is 20ml / min;

[0102] (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 620mAh g -1 , the first charge and discharge efficiency is 7%, the particle size is 5μm, and the specific surface area is 550m 2 g -1 Li 5 Fe 1-x mn x o 4 .

[0103] 2. LiCoO 2 (75wt%),...

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Abstract

The invention belongs to the field of lithium ion battery materials, and specifically discloses the application of Mn-doped lithium ferrate. Mn-doped lithium ferrate is added to a positive electrode active material as a lithium supplement additive, and used to prepare a lithium supplement positive electrode material of a lithium ion battery. The chemical formula of Mn-doped lithium ferrate is Li5Fe1-xMnxO4, wherein x is from 0.05 to 0.1. The invention further provides the preparation method of Mn-doped lithium ferrate used in the application method. An iron source, a manganese source and a lithium source in a stoichiometric ratio are ball-milled in a surfactant solution, and then spray-dried to acquire a precursor. The precursor is sintered in a protective atmosphere at 600 to 900 DEG C toacquire the Mn-doped lithium ferrate. The invention further provides the application of the lithium supplement positive electrode material and the application of the positive electrode material in the lithium ion battery. The invention finds that the lithium supplement additive and the positive electrode active material have synergy. In addition, the invention further provides the preparation method which has the advantages of simple operation, short preparation period and high 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) is currently the most promising and fastest-growing high-efficiency secondary battery, which has many advantages such as high specific energy, low self-discharge, good cycle performance, and no memory effect. [0003] The Li+ in lithium-ion batteries all come from the positive electrode material, and the negative electrode generally uses graphite material. When the battery is charged for the first time, the surface of the negative electrode of the lithium-ion battery will consume Li+ to form a layer of SEI film, causing the initial capacity loss (Initial Capacity Loss, ICL), and the ICL of the lithium-ion battery with the graphite negative electrode is about 7% to 10%. . High-capaci...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
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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