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LLTO/nanosheet lithium cobalt oxide composite positive electrode material and preparation method thereof

A composite positive electrode material, flake lithium cobalt oxide technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of poor battery performance, limited application, reduced capacity, etc., to improve power characteristics and safety Effect of enhancing and suppressing temperature rise

Pending Publication Date: 2022-02-01
陕西红马科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobaltate has the advantages of high discharge platform, good cycle performance, and simple synthesis process. However, in the process of repeated charge and discharge, due to the repeated insertion and extraction of lithium ions, the structure of the active material changes after repeated shrinkage and expansion. lead to LiCoO 2 The internal resistance increases, the capacity decreases, and the battery performance is poor under high temperature conditions, which limits its application in lithium-ion batteries

Method used

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  • LLTO/nanosheet lithium cobalt oxide composite positive electrode material and preparation method thereof
  • LLTO/nanosheet lithium cobalt oxide composite positive electrode material and preparation method thereof
  • LLTO/nanosheet lithium cobalt oxide composite positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] S1. Preparation of nano-flaky cobalt tetroxide: inject 40L of ammonia water with a concentration of 10g / L into the reactor as the bottom liquid, start stirring, and slowly add 160L of cobalt chloride solution with a concentration of 80g / L and 140L with a mass fraction of 20% sodium hydroxide solution, after the feeding is completed, the temperature of the material is raised to 60°C, and the temperature is kept for 1.5 hours to form a cobalt hydroxide slurry with flaky primary particles. In order to prevent the cobalt hydroxide from being oxidized, feed Nitrogen for protection; after the heat preservation is over, press filter and wash the above slurry, add pure water to the filter cake obtained after the slurry press filter and water wash to make a slurry, and perform flash drying. The air temperature for flash drying is 300-350°C , and then crushed by a jet mill to obtain flake cobalt hydroxide without agglomeration and adhesion; place the weighed cobalt hydroxide in a ...

Embodiment 2

[0040] S1. Preparation of nano-flaky cobalt tetroxide: inject 40L of ammonia water with a concentration of 10g / L into the reactor as the bottom liquid, start stirring, and slowly add 160L of cobalt chloride solution with a concentration of 80g / L and 140L with a mass fraction of 20% sodium hydroxide solution, after the feeding is completed, the temperature of the material is raised to 60°C, and the temperature is kept for 1.5 hours to form a cobalt hydroxide slurry with flaky primary particles. In order to prevent the cobalt hydroxide from being oxidized, feed Nitrogen for protection; after the heat preservation is over, press filter and wash the above slurry, add pure water to the filter cake obtained after the slurry press filter and water wash to make a slurry, and perform flash drying. The air temperature for flash drying is 300-350°C , and then crushed by a jet mill to obtain flake cobalt hydroxide without agglomeration and adhesion; place the weighed cobalt hydroxide in a ...

Embodiment 3

[0049] S1. Preparation of nano-flaky cobalt tetroxide: inject 40L of ammonia water with a concentration of 10g / L into the reactor as the bottom liquid, start stirring, and slowly add 160L of cobalt chloride solution with a concentration of 80g / L and 140L with a mass fraction of 20% sodium hydroxide solution, after the feeding is completed, the temperature of the material is raised to 60°C, and the temperature is kept for 1.5 hours to form a cobalt hydroxide slurry with flaky primary particles. In order to prevent the cobalt hydroxide from being oxidized, feed Nitrogen for protection; after the heat preservation is over, press filter and wash the above slurry, add pure water to the filter cake obtained after the slurry press filter and water wash to make a slurry, and perform flash drying. The air temperature for flash drying is 300-350°C , and then crushed by a jet mill to obtain flake cobalt hydroxide without agglomeration and adhesion; place the weighed cobalt hydroxide in a ...

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Abstract

The invention discloses an LLTO / nanosheet lithium cobalt oxide composite positive electrode material and a preparation method thereof. The positive electrode material comprises nanosheet lithium cobalt oxide and an LLTO solid electrolyte material coating layer coating the nanosheet lithium cobalt oxide. The preparation method comprises the following steps: preparation of nano flaky cobaltosic oxide, preparation of nano flaky lithium cobalt oxide, preparation of a nano LLTO solid electrolyte material, and preparation of the flaky lithium cobalt oxide positive electrode material coated with the nano LLTO solid electrolyte material. The electrochemical performance of the positive electrode material can be synchronously improved, and the internal resistance of the battery is reduced, so that the safety performance and power performance of the lithium battery are comprehensively improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically relates to an LLTO / nano flake lithium cobalt oxide composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in 3C digital products such as watches, mobile phones, notebooks, digital cameras and energy vehicles due to their high energy density, high power density, good cycle performance, high-rate charge and discharge, and environmental friendliness. There are increasing demands on the performance of lithium-ion batteries, especially in terms of high safety and ultra-high power. The cathode material is a key factor that determines the electrochemical performance, safety performance and future development direction of lithium-ion batteries. [0003] The currently commercialized cathode materials mainly include lithium cobaltate, lithium manganate, ternary materials and lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/525H01M4/62H01M10/0525H01M10/0562
CPCH01M4/366H01M4/523H01M4/525H01M4/624H01M10/0562H01M10/0525H01M2004/028Y02E60/10
Inventor 吴晓静田新勇高彦宾
Owner 陕西红马科技有限公司
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