Aluminum cladding method of high-safety lithium ion battery anode material

A technology for lithium ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of unstable lithium cobalt oxide structure, enhanced surface activity of materials, hidden dangers of battery safety, etc., and achieves a simple and easy-to-operate coating method. , the effect of reducing dissolution and high production efficiency

Inactive Publication Date: 2012-02-29
JIANGSU KING LITHIUM CELL
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Problems solved by technology

After increasing the charging voltage (>4.2V), on the one hand, more than 50% of the lithium ions in lithium cobalt oxide will move out, which will cause the structure of lithium cobalt oxide to be unstable and prone to structural collapse; on the other hand, after increasing the voltage The surface activity of the material is enhanced, and it is easy to react with the electrolyte, which will bring potential safety hazards to the battery

Method used

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Embodiment Construction

[0015] The method of the embodiment of the present invention is as follows:

[0016] 1. The aluminum source is aluminum isopropoxide; the co-solvent is toluene, which can significantly improve the solubility of the aluminum source and is suitable for industrialization. On the other hand, it can significantly improve the uniformity of surface aluminum coating, and toluene can be used as a solvent to achieve transparency , Uniform and stable aluminum source sol; formulated into aluminum salt sol with a weight concentration of 15% to 30%.

[0017] 2. The coating phase is alcohols such as methanol or ethanol, or acetone, which can achieve mutual dissolution of aluminum salt, toluene, and organic coating liquid phase; the coating process is: the finished product of lithium manganate cathode material that is coated Add to the coating phase methanol or ethanol or acetone. The weight ratio of the finished cathode material to the organic coating phase is controlled at 1:2~3:1. After stirr...

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Abstract

The invention relates to a manufacturing method of a lithium ion battery anode material, in particular to an aluminum cladding method of a high-safety lithium ion battery anode material. The method comprises the following steps of: a, manufacturing a non-cladded anode material by adopting a conventional method; b, preparing a cladding solution, wherein the cladding solution is aluminum salt sol formed by mutually dissolving an aluminum source and a cosolvent, and the weight concentration of the aluminum salt in the sol is 15-30 percent; c, performing a cladding process: adding the non-cladded anode material to cladding-phase methanol or ethanol or acetone, stirring and mixing, and then adding an aluminum salt sol cladding solution, wherein the molar ratio Al / M of the element Al to the central element M of the anode material is 0.002-0.05; and d, heating and drying for 1-6h at 70-100 DEG C under the vacuumizing condition to form a finished product. According to the aluminum cladding method disclosed by the invention, the high-temperature storage safety and the cycle stability of the lithium ion anode material under high charging cutoff voltage can be ensured.

Description

Technical field [0001] The invention relates to a method for manufacturing a positive electrode material of a lithium ion battery, and a specific amount of aluminum coating method for a positive electrode material of a lithium ion battery with high safety. Background technique [0002] As a new type of secondary battery, Lithium-ion battery has the characteristics of high specific capacity, high voltage and good safety. It is widely used as the driving power of portable electric appliances such as mobile phones, notebook computers, camcorders, DVDs, MP3s, etc. However, with the continuous upgrading of electronic products, the requirements for their power sources have also been continuously improved, so there are higher requirements for the energy density of battery materials. There are two main methods to improve the energy density of materials: [0003] 1. In terms of improving material conductivity and compaction density [0004] Under the premise of exerting the same capacity, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1391H01M4/525
CPCY02E60/10
Inventor 崔立峰王辉杨克涛葛云科王熙帧
Owner JIANGSU KING LITHIUM CELL
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