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Lithium ion battery positive electrode material coated with amorphous passivation layer and with stable surface and preparation method thereof

A lithium-ion battery and cathode material technology, applied in the field of electrochemical energy storage, can solve problems such as difficulty in fully exerting its role, and achieve the effects of facilitating industrial production, simple and efficient operation steps, and improving film-forming properties

Pending Publication Date: 2022-02-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However for LiCoO 2 Positive electrode, C will react with the material at high temperature to form cobalt oxide, so it is difficult to fully play its role

Method used

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  • Lithium ion battery positive electrode material coated with amorphous passivation layer and with stable surface and preparation method thereof
  • Lithium ion battery positive electrode material coated with amorphous passivation layer and with stable surface and preparation method thereof
  • Lithium ion battery positive electrode material coated with amorphous passivation layer and with stable surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing surface-passivated high-voltage lithium cobalt oxide. Weigh 0.1g of anhydrous H 3 PO 4 In a 10mL beaker, add 4mL of absolute ethanol and stir to disperse evenly, then add 2.0g of lithium cobaltate prepared by a solid-phase method, continue stirring at room temperature for 12 hours, filter and wash once with ethanol, and dry The final product was placed in a crucible, placed in a muffle furnace, raised to 600°C at a rate of 5°C / min and kept at a temperature of 6 hours, and then cooled naturally. The obtained material is the surface-modified high-voltage lithium cobalt oxide material.

[0028] The electrochemical performance of the cathode material was evaluated using CR2016 button cell. The negative pole of the button battery is 1 mm in thickness and a metal lithium sheet with a diameter of 15 mm, and the positive electrode adopts surface-modified LiCoO in Example 1. 2 material, conductive acetylene black, and binder polyvinylidene fluoride (PV...

Embodiment 2

[0030] A method for preparing a surface-passivated NCM ternary cathode material. Weigh 0.1g H 3 BO 3 In a 10mL beaker, add 4mL of absolute ethanol and stir to dissolve it completely, then add 2.0g of LiNi prepared by coprecipitation 0 33 co 0.33 mn 0.33 o 2 After stirring continuously for 6 hours in a water bath at 50°C, filter and wash with ethanol for 2-3 times, place the dried product in a crucible, put it in a muffle furnace, and raise the temperature to 600 at a rate of 5°C / min. ℃ and keep warm for 6 hours, then cool down naturally. The obtained material is the surface-modified NCM ternary cathode material.

[0031] The method for evaluating the electrochemical performance of the NCM ternary positive electrode material surface-treated with boric acid is the same as in Example 1.

Embodiment 3

[0033] A method for preparing a surface-passivated NCM high-nickel ternary positive electrode material. Weigh 0.1g H 3 PO 2 (Hypophosphorous acid) in a 10mL beaker, add 4mL of absolute ethanol and stir to dissolve completely, then add 2.0g of LiNi prepared by solid phase method 0.8 co 0.1 mn 0.1 o 2 After stirring continuously for 2 hours at room temperature, filter and wash with ethanol for 2-3 times, place the dried product in a crucible, put it in a tube furnace, and heat it at a rate of 5°C / min in an Ar gas atmosphere Raise to 700°C and keep it warm for 6 hours, then cool down naturally. The obtained material is the surface-modified NCM ternary cathode material.

[0034] The electrochemical performance evaluation method of the NCM high-nickel ternary positive electrode material treated with hypophosphorous acid is the same as that of Example 1.

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Abstract

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly relates to a lithium ion battery positive electrode material coated with an amorphous passivation layer and with a stable surface and a preparation method thereof. The core is that a complete and uniform amorphous passivation layer is constructed on the surfaces of positive electrode particles by utilizing a neutralization reaction and an oxidation-reduction reaction between a weak acid solution and a weakly alkaline surface of an oxide positive electrode, so that the lithium ion battery positive electrode material with good interface stability in air and an electrolyte is prepared. According to the scheme, the amorphous passivation layer with a good electron and ion pathway is formed through simple weak acid treatment and in-situ reaction, so that the interface stability of the positive electrode material is improved, and the method is of important significance in improving the electrochemical performance of the positive electrode material. The method provided by the invention is remarkable in effect, simple and efficient in step, low in cost and easy to realize industrial preparation.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a lithium-ion battery cathode material coated with a stable amorphous passivation layer and a preparation method thereof. Background technique [0002] With the rapid development of human society, people's demand for energy has increased sharply, especially after entering the 21st century, China's total energy consumption has risen sharply, and the total domestic energy consumption has more than tripled within 20 years. Non-renewable fossil energy cannot effectively meet the urgent needs of the people for energy, and people are vigorously developing sustainable and renewable new energy technologies including solar energy, geothermal energy, wind energy, and biomass energy. However, the use of new energy has the characteristics of uneven spatial distribution and uneven time distribution. Therefore, people need to use efficient and stable new energy storage m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/36
CPCH01M4/505H01M4/525H01M4/366Y02E60/10
Inventor 黄富强蔡明志
Owner PEKING UNIV
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