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Modification method of lithium ion battery cathode material

A cathode material and lithium ion technology, which is applied in the field of cathode material preparation of lithium ion batteries, can solve the problems of poor high temperature performance and cycle instability, and achieve the effects of good consistency, good coating uniformity and improved high temperature performance.

Active Publication Date: 2015-06-24
INST OF CHEM CHINESE ACAD OF SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of unstable circulation and poor high-temperature performance existing in the existing lithium manganate positive electrode materials, and overcome the deficiencies of the prior art, and provide a surface modification method of lithium manganate and modified manganese Lithium Oxide Cathode Material

Method used

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  • Modification method of lithium ion battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Titanium oxide-coated lithium manganate material: put the prepared lithium manganate body material into a vacuum chamber, and evacuate to a vacuum degree of 3×10 -4 Pa, heated to 100°C, bombarded metal titanium (purity 99.9%) with high-speed particles, firstly introduced argon gas into the vacuum chamber with a flow rate of 50 sccm, and then injected oxygen at a flow rate of 5 sccm, the whole process lasted for 5 minutes, and obtained nano-titanium oxide Coated lithium manganese oxide material (such as figure 2 shown). The thickness of the cladding material is 1-3nm.

Embodiment 2

[0028] The whole process of feeding oxygen lasts for 10 minutes, so as to control the thickness of the cladding material to be 8-10 nm, and the others are the same as in Example 1.

Embodiment 3

[0030] Zinc oxide-coated lithium manganate material: put the prepared lithium manganate body material into a vacuum chamber, and evacuate to a vacuum degree of 2×10 -4 Pa, heated to 150°C, and bombarded metal zinc (purity 99.9%) with high-speed particles, argon gas was introduced into the vacuum chamber at a flow rate of 50 sccm, and then oxygen was injected at a flow rate of 5 sccm. The whole process lasted for 3 minutes, and the thickness of the cladding layer was controlled. The thickness is 3-5nm, and the lithium manganese oxide material coated with nano-zinc oxide is obtained.

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Abstract

The invention provides a surface modification method of a lithium ion battery cathode material lithium manganate. The method comprises the steps of implanting a coating material into a surface layer of the lithium manganate body material by virtue of the bombardment of high-speed particle beams. The surface modification method is good in coating uniformity, and the coating thickness is controllable. The electrochemical performance test shows that the lithium manganate cathode material with the surface modified by adopting the high-speed particle injection method is high in cycling stability and obviously high in high-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials of lithium ion batteries, and in particular relates to a modification method of lithium manganate positive electrode materials. Background technique [0002] Lithium manganate (LiMn 2 o 4 ) as a lithium-ion battery cathode material has the advantages of simple synthesis, high platform voltage (3.9-4.1V), non-toxic, safe, and good overcharge resistance, and the raw material manganese is rich in resources and low in price, making it a An ideal choice for power battery cathode materials. At present, lithium manganese oxide cathode materials mainly have problems such as storage under high temperature conditions, poor cycle performance, and severe capacity fading. The factors that cause capacity loss mainly include John-teller distortion, the dissolution and loss of manganese in the electrolyte, the decomposition of the electrolyte, and the existence of oxygen def...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62
CPCY02E60/10
Inventor 郭玉国王维殷雅侠万立骏张亚利张风太熊俊威
Owner INST OF CHEM CHINESE ACAD OF SCI
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