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Surface modified lithium ion battery positive electrode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of weak electronic conductivity and HF corrosion resistance, and reduced conductivity of positive electrode materials. Occurs other side reactions, relieves fragmentation, and increases the effect of gram capacity

Active Publication Date: 2021-12-07
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electronic conductivity and HF corrosion resistance of this type of coating material are not strong, and the electrical conductivity of the positive electrode material will often be reduced after coating the surface of the positive electrode material, and at the same time, it cannot resist HF corrosion under long-term cycle conditions.

Method used

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  • Surface modified lithium ion battery positive electrode material and preparation method thereof
  • Surface modified lithium ion battery positive electrode material and preparation method thereof
  • Surface modified lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0027] The present invention also provides a preparation method of the phosphide layer, wherein the lithium ion positive electrode material whose surface is coated with the first modified coating layer is placed in a reaction container, and the pH 3 The gas is the reducing agent, the pH 3 The gas is mixed with argon and passed into the reaction vessel, and the pH 3 Strong reducibility under heating conditions, directly phosphating the surface of the first modified coating layer of the lithium-ion battery cathode material, after phosphating, a layer of phosphorus is formed on the surface of the first modified coating layer of the lithium-ion cathode material This layer of phosphide has a good protective effect on the positive electrode material in the electrochemical process.

[0028] In some embodiments of the present invention, the first modified coating layer is coated on the surface of the lithium ion cathode material by co-precipitation or sol-gel method.

[0029] In som...

Embodiment 1

[0036] Take La 0.7 Sr 0.3 MnO 3 Coated cathode active material NCM@La 0.7 Sr 0.3 MnO 3 Put it in the burning boat of the tube furnace and pave it flat, the thickness of the paving is 1-2cm, raise the temperature of the tube furnace to 200°C, and pass in the PH 3 Mixture of gas and argon, mixed gas, PH 3 The volume ratio of gas to argon is 1:1; the flow rate of the mixed gas is 250ml / min, PH 3 The reaction time between the mixed gas of gas and argon and the positive electrode material is 3 hours, so that the pH 3 The molar ratio of gas to lithium ion cathode material is controlled between 1-10:1. Using PH 3 The strong reducibility under heating conditions directly affects the La of the positive electrode material of lithium-ion batteries. 0.7 Sr 0.3 MnO 3 Phosphating is carried out on the surface of the coating layer, and after phosphating, a layer of phosphide is formed on the surface of the coating layer of the lithium ion positive electrode material to obtain the ...

Embodiment 2

[0038] Take MoO 3 Coated lithium-rich cathode material 0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 @MoO 3 (LR@MoO 3 ) placed in the burning boat of the tube furnace and paved with a thickness of 1-2cm, the temperature of the tube furnace was raised to 100°C, and PH 3 Mixture of gas and argon, mixed gas, PH 3 The volume ratio of gas to argon is 3:1; the flow rate of mixed gas is 100ml / min, PH 3 The reaction time between the mixed gas of gas and argon and the positive electrode material is 4 hours, so that the pH 3 The molar ratio of gas to lithium ion cathode material is controlled between 1-10. Using PH 3 Strong reducibility under heating conditions, directly on MoO as cathode material for lithium-ion batteries 3 Phosphating is carried out on the surface of the coating layer, and after phosphating, a layer of phosphide is formed on the surface of the coating layer of the lithium ion positive electrode material to obtain the surface modified lithium ion battery posi...

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Abstract

The invention provides a surface modified lithium ion battery positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: putting a lithium ion positive electrode material coated with a first modified coating layer on the surface into a reaction container, mixing PH3 gas serving as a reducing agent with argon, introducing the mixture into the reaction container, directly phosphorizing the surface of the first modified coating layer of the lithium ion battery positive electrode material by utilizing the strong reducibility of PH3 under a heating condition, and then obtaining the surface modified lithium ion battery positive electrode material. According to the method, the coating layer of the positive electrode material of the lithium ion battery is phosphorized through the PH3 gas, a layer of phosphide is generated on the surface of the coating layer after phosphorization, and the phosphide can obviously improve the corrosion resistance of the positive electrode material of the battery to HF and the conductivity of the coating layer and has a relatively good protection effect on the positive electrode material in the electrochemical process; and the capacity retention ratio and gram capacity exertion of the battery can be obviously improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a surface-modified lithium-ion battery cathode material and a preparation method thereof. 【Background technique】 [0002] After years of development, lithium-ion battery technology has occupied most of the market share of built-in power supplies in mobile devices, such as mobile phones, laptops, Bluetooth headsets and various wearable devices. The large-scale application of lithium-ion batteries is attributed to its characteristics of no memory effect, no pollution, long life and high energy density. With the improvement of people's environmental requirements, the development of new energy vehicles has become the current focus of scientific and technological development, and lithium-ion batteries as the power system of new energy vehicles have become more and more important. In lithium-ion batteries, the cathode material largely determines the performance of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525H01M10/42
CPCH01M4/366H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 郑锋华李玉王红强李庆余潘齐常谭春雷范小萍
Owner GUANGXI NORMAL UNIV
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