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Lithium-rich material with compositely coated surface, and preparation method thereof

A lithium-rich material and surface composite technology, applied in the field of lithium-ion batteries, can solve the problems of unsatisfactory conductivity or lithium-ion conductivity, poor conductivity of lithium-ion conductors, and affecting battery cycle performance, etc., to achieve good lithium-ion conductivity , Improve the rate performance and reduce the effect of adverse effects

Active Publication Date: 2018-06-22
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although some electrochemically active metal oxide coatings can improve the first Coulombic efficiency by providing additional capacity, they may have side reactions with the electrolyte during charge and discharge, thereby affecting the cycle performance of the battery; some Although the metal oxide coating layer is very stable, its electrical conductivity or lithium ion conductivity is not ideal
However, lithium-ion conductors with high lithium-ion conductivity cannot provide additional capacity, and the conductivity of some lithium-ion conductors is not as good as that of metal oxides.

Method used

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  • Lithium-rich material with compositely coated surface, and preparation method thereof
  • Lithium-rich material with compositely coated surface, and preparation method thereof
  • Lithium-rich material with compositely coated surface, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] This embodiment provides a method for preparing a lithium-rich material whose surface is co-coated with spinel lithium manganese oxide and lithium sulfate, which includes the following steps:

[0058] Weigh 4.9g of manganese acetate tetrahydrate (0.02mol), dissolve 2.64g of ammonium sulfate (0.02mol) in 100ml of water, and form 100g into Li[Li 0.12 Ni 0.3 co 0.06 mn 0.5 ]O 2 The Li-rich material was dispersed in the solution and stirred at 80 °C until the solution was evaporated to dryness. Then the dried powder was heat-treated at 600°C for 5 hours, cooled with the furnace, and finally a lithium-rich material whose surface was co-coated with spinel-type lithium manganese oxide and lithium sulfate was obtained. The coating amounts of lithium manganate and lithium sulfate accounted for 1.8 wt% and 2.2 wt% of the total mass.

Embodiment 2

[0060] This embodiment provides another method for preparing a lithium-rich material whose surface is compositely coated with spinel lithium manganese oxide and lithium sulfate, which includes the following steps:

[0061] Weigh 3.38g of manganese sulfate monohydrate (0.02mol) and dissolve it in 100ml of water, and make 100g into Li[Li 0.12 Ni 0.3 co 0.06 mn 0.5 ]O 2 The Li-rich material was dispersed in the solution and stirred at 80 °C until the solution was evaporated to dryness. Then the dried powder was heat-treated at 600°C for 5 hours, cooled with the furnace, and finally a lithium-rich material whose surface was co-coated with spinel-type lithium manganese oxide and lithium sulfate was obtained. The coating amounts of lithium manganate and lithium sulfate accounted for 1.8 wt% and 2.2 wt% of the total mass.

[0062] figure 1 is the X-ray diffraction pattern of the materials prepared in Comparative Example 1, Example 1 and Example 2. It can be seen from the figure...

Embodiment 3

[0071] Weigh 0.3g Zr(SO 4 ) 2 4H 2 O, dissolved in 15ml of water, made up 10g of Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 The Li-rich material was dispersed in the solution and stirred at 80 °C until the solution was evaporated to dryness. Then the above mixture was heat-treated at 600°C for 5 hours, cooled with the furnace, and finally obtained a lithium-rich material co-coated with lithium zirconate and lithium sulfate. The coating amounts of lithium zirconate and lithium sulfate accounted for 1.6wt% and 2.3 wt%.

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Abstract

The invention provides a lithium-rich material with a compositely coated surface, and a preparation method thereof. According to the lithium-rich material with compositely coated surface, a compound comprising metal and sulfur is coated on the surface of the lithium-rich material to obtain a composite material. According to the lithium-rich material with compositely coated surface, the first coulombic efficiency, the rate performance and the cycle performance of the lithium-rich material are improved by composite coating.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium-rich material coated on the surface and a preparation method thereof. Background technique [0002] With the development of human society, limited fossil energy can no longer meet people's increasing demand for energy, and the problems of global warming and environmental pollution caused by traditional energy have forced people to develop clean renewable energy (solar energy, wind energy, earth energy, etc.) thermal energy, etc.) and corresponding energy storage equipment to solve human energy problems. As a rechargeable secondary battery, lithium-ion battery has the characteristics of high energy density, long service life, no memory effect, and environmental friendliness. Since its commercialization, it has been widely used in various portable batteries such as mobile phones and notebook computers. Electronic equipment. In recent years, wit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 王振尧刘洋庄卫东王忠高敏卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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