A kind of fluoride/oxide co-coated positive electrode material and preparation method thereof

A cathode material, oxyfluoride technology, applied in the direction of positive electrode, electrode manufacturing, active material electrode, etc., can solve the problems of unpredictable coating effect, loose material structure, difficult coating layer, etc., to achieve good cycle Stability, damage reduction, good cycle performance

Active Publication Date: 2022-03-15
常州苏锂科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In view of this, the present invention aims to propose a fluoride / oxide co-coated positive electrode material and its preparation method. The positive electrode material in the present invention has better cycle stability, storage life, high temperature performance and Safety performance, to solve the problem that the existing coating method is not easy to obtain a uniform and controllable coating layer. The material structure after coating is relatively loose or not stable enough, which will cause the coating layer to fall off in the subsequent processing and application process, and the coating The problem that the coverage effect cannot meet the expectations

Method used

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  • A kind of fluoride/oxide co-coated positive electrode material and preparation method thereof
  • A kind of fluoride/oxide co-coated positive electrode material and preparation method thereof
  • A kind of fluoride/oxide co-coated positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0044] 500g of lithium cobaltate (LCO) and 5g of nano-Al 2 o 3 , MgO and TiF 4 , WF 6 Put it in a high-mixer and mix it at 4000rpm for 10 minutes. The ratio of metal elements added to the four materials is 3:3:2:2. After mixing evenly, put it in an atmosphere furnace and keep it warm at 900°C for 10 hours in an air environment. Cool down to 600°C at a rate of 30°C / min, keep it warm for 5 hours, and then cool to room temperature at a rate of 2°C / min (for the quenching-tempering heat treatment temperature-time curve, see figure 2 ), take out, pulverize and sieve to get 1wt% Al 0.3 Mg 0.3 Ti 0.2 W 0.2 OF 1.5 Coated LCO cathode material, the material structure see image 3 , see the preparation process figure 1 .

[0045] The coated LCO and the uncoated LCO materials were made into positive electrode sheets and coin cells for performance comparison. The positive electrode is composed of: active material: conductive additive: binder = 92:5:3, using Celgard2300 type diap...

Embodiment 2

[0047] 500g of lithium cobaltate (LCO) and 5g of nano-Al 2 o 3 , MgO, ZrO 2 and AlF 3 , WF 6 Put it in a ball mill and mix it thoroughly for 2 to 3 hours. The ratio of metal elements added to the five materials is 2:3:2:1:2. After mixing evenly, keep it in an atmosphere furnace at 800°C for 12h, and then heat it at a speed of 30°C / min. Cool down to 550°C and keep it for 6 hours, then cool to room temperature at a rate of 2°C / min, take it out, pulverize and sieve to get 1wt% Al 0.3 Mg 0.3 Zr 0.2 W 0.2 OF 1.5 Coated LCO cathode material.

Embodiment 3

[0049] Spread 1g of lithium cobalt oxide (LCO) on the substrate, with Al 2 o 3 , MgO, ZrO 2 and NbF 5 、TiF 4 as the target, in a vacuum of 10 -2 torr, voltage 24V, and argon atmosphere, depositing for 25 seconds, 16 seconds, 9 seconds, 5 seconds and 17 seconds respectively, depositing different raw materials on the surface of lithium cobalt oxide particles, and then keeping it at 700°C for 5 hours in an argon atmosphere , and then cooled to room temperature at a rate of 25 °C / min, then raised to 450 °C at a rate of 2 °C / min and kept for 4 hours, and then cooled to room temperature at a rate of 2 °C / min to obtain a compound coated Al on LCO 0.3 Mg 0.2 Zr 0.1 Nb 0.1 Ti 0.2 OF cathode material.

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Abstract

The invention provides a fluoride / oxide co-coated positive electrode material, which comprises a positive electrode material main body, a composite coating layer, and a diffusion doped layer. The composite coating layer is formed by uniformly covering the surface of the positive electrode material main body with oxyfluoride. The continuous coating film and the diffusion doping layer are formed by the diffusion of some metal element ions in the composite coating layer to the surface layer of the main body of the positive electrode material. The invention also provides a preparation method for the fluoride / oxide co-coated positive electrode material. The improved cathode material of the invention has better cycle stability, storage life, high temperature performance and safety performance under high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a fluoride / oxide co-coated cathode material and a preparation method thereof. Background technique [0002] With the rapid development of modern social economy and technology, the performance of traditional lithium-ion batteries can no longer meet the current energy demand. The rapid development of electric vehicles, intelligent consumer electronics and other fields are in urgent need of lithium-ion batteries with higher energy density, long cycle life, low cost, and high safety. [0003] In terms of positive electrodes, high voltage and high capacity positive electrodes such as LiNi 0.5 mn 1.5 o 4 、xLi 2 MnO 3 ·(1-x)LiMO 2 (lithium-rich manganese base), LiNi 0.8 co 0.1 mn 0.1 o 2 / LiNi 0.8 co 0.15 Al 0.05 o 2 (NCM811 / NCA) and high voltage LiCoO 2 It is a promising cathode material for high energy density. Although these material systems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/04H01M10/0525H01M10/42
CPCH01M4/628H01M4/366H01M4/04H01M4/0471H01M10/0525H01M10/4235H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 周子龙郭炳焜
Owner 常州苏锂科技有限责任公司
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