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Application of composite material

A composite material and cathode material technology, which is applied in the application field of composite materials in lithium ion battery materials to achieve the effects of promoting migration speed, improving rate performance, and complete deintercalation of lithium ions

Active Publication Date: 2022-06-24
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above doping and coating methods cannot change the situation that lithium ions can only conduct in two-dimensional channels.

Method used

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  • Application of composite material
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step (1): Add nano-scale aluminum powder with a size of about 200 nm into water, and ultrasonically disperse to obtain an aluminum powder suspension with a solid content of 2.5 g / L. The aluminum powder suspension was transferred to a round-bottomed flask, stirred at a speed of 300rpm, heated to 45°C, and then added manganese fluoride powder (the molar ratio of manganese fluoride and aluminum powder was 1:5), and after 20min of reaction, The product is centrifuged and washed to obtain a porous manganese hydroxide-coated aluminum fluoride composite material. Water was added to the composite material to obtain a suspension with a solid content of 1 g / L.

[0044] Step (2): prepare a nickel-cobalt-manganese sulfate solution according to the molar ratio of Ni:Co:Mn=8:1:1, and the total concentration of metal ions in the sulfate solution is 2mol / L. The bottom liquid of the reaction kettle was prepared, the pH value of the bottom liquid was 11.6, and the ammonia concentration ...

Embodiment 2

[0052] Step (1): adding nano-scale aluminum powder with a size of about 250 nm into water, and ultrasonically dispersing to obtain an aluminum powder suspension with a solid content of 3 g / L. The aluminum powder suspension was transferred to a round-bottomed flask, stirred at a stirring speed of 400 rpm, and heated to 45 °C, and then added manganese fluoride powder (molar ratio of manganese fluoride and aluminum powder was 1:3), and reacted for 25 minutes. , the product is centrifuged and washed to obtain a composite material of porous manganese hydroxide coated aluminum fluoride. The composite material was added with water to prepare a suspension with a solid content of 1.5 g / L.

[0053] Step (2): prepare a nickel-cobalt-manganese sulfate solution according to the ratio of Ni:Co:Mn=8.8:0.9:0.3, and the total concentration of metal ions in the nickel-cobalt-manganese sulfate solution is 2.5mol / L. Ammonia solution was prepared as complexing agent, and sodium hydroxide solution...

Embodiment 3

[0057] Step (1): adding nano-scale aluminum powder with a size of about 400 nm into water, and ultrasonically dispersing to obtain an aluminum powder suspension with a solid content of 3 g / L. The aluminum powder suspension was transferred to a round-bottomed flask, stirred at a stirring speed of 300 rpm, and heated to 50 °C, followed by adding manganese fluoride powder (the molar ratio of manganese fluoride and aluminum powder was 1:4), and the reaction was carried out for 30 minutes. Afterwards, the product is centrifuged and washed to obtain a composite material of porous manganese hydroxide coated with aluminum fluoride. The composite material was added with water to prepare a suspension with a solid content of 2 g / L.

[0058] Step (2): prepare a nickel-cobalt-manganese sulfate solution with a total metal ion concentration of 2 mol / L according to the ratio of Ni:Co:Mn=9:0.5:0.5. Ammonia solution was prepared as complexing agent, and sodium hydroxide solution was used as pr...

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Abstract

The invention belongs to the field of lithium ion battery materials, and discloses an application of a composite material in a lithium ion battery material. According to the preparation method, the porous composite material of the aluminum fluoride coated with the nano manganese hydroxide is formed by etching the nano aluminum powder. Then the composite material slowly releases nano manganese hydroxide in a wet preparation stage of a precursor material, so that the precursor grows on the manganese hydroxide and gradually wraps the manganese hydroxide; the precursor material is dried at a high temperature, hydrogen fluoride gas is slowly released, aluminum fluoride is converted into aluminum oxide, and the precursor also becomes loose and porous. And mixing lithium and sintering to obtain the positive electrode material. Due to the existence of the three-dimensional channel in the positive electrode material, the lithium ion deintercalation is more thorough in the charge-discharge process, the material reversibility is better, and the stability is better. And the existence of lithium manganate and lithium aluminate also provides more pillars for the material, so that the structure collapse of the positive electrode material in the long-cycle process is reduced.

Description

[0001] This application is a divisional application of the patent with the application number of 2022102671804, the invention name is "precursor material, positive electrode material and preparation method, composite material and application", and the application date is March 18, 2022. technical field [0002] The invention belongs to the technical field of lithium ion battery materials, and particularly relates to the application of composite materials in lithium ion battery materials. Background technique [0003] Lithium-ion batteries have become the main source of power for electric vehicles due to their high energy density and long service life. To meet the market demand for long driving range and short charging time of electric vehicles, current research is mainly focused on developing cathode materials with high energy and high power density. Because LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) High capacity (about 200mAh g -1 ), high operating voltage (~3.8V vs Li + / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01F7/50C01F7/02C01G45/12C01F7/043H01M4/485H01M4/505H01M10/0525
CPCC01F7/50C01F7/02C01G45/02C01F7/043C01G45/1214H01M4/505H01M4/485H01M10/0525H01M2004/028C01P2004/80C01P2004/03Y02E60/10
Inventor 张宝程磊丁瑶邓鹏林可博周亚楠
Owner ZHUJI PAWA NEW ENERGY