Lithium ion battery anode material and manufacturing method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems affecting the effect of coating treatment, and achieve stable electrochemical cycle performance, uniform particle size, and simple coating process.

Inactive Publication Date: 2012-08-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another important issue in the surface coating treatment of electrode materials is to select a suitable method, to easily control the process, and to obtain the consistency of the product, and the use of different treatment methods will affect the coating treatment effect

Method used

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  • Lithium ion battery anode material and manufacturing method thereof
  • Lithium ion battery anode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The preparation method of lithium-ion battery cathode material of this embodiment:

[0033] (1) The prepared zinc phosphate containing phosphate and zinc ions has a concentration of 20wt% zinc dihydrogen phosphate, and the nickel oxide cobalt manganese lithium cathode material powder with a particle size distribution of 5 to 10 microns is suspended in a fluidized bed with nitrogen gas , the temperature is controlled at 60°C, and then the aqueous solution containing phosphate and zinc ions is atomized and passed into the fluidized bed for 30 minutes, so that the surface of the positive electrode material particles absorbs the phosphate liquid film until the coating amount is phosphate Accounting for 1.5% of the weight of the positive electrode material;

[0034](2) Stop feeding the atomized aqueous solution containing phosphate and zinc ions, keep the nickel oxide cobalt manganese lithium cathode material powder suspended in the fluidized bed with carrier g...

Embodiment 2

[0038] Embodiment 2: The preparation method of lithium-ion battery cathode material in this embodiment:

[0039] The processing steps of embodiment 2 and embodiment 1 are the same, and the difference is to pass into the reaction chamber after atomizing with 15wt% lithium zinc phosphate aqueous solution, the temperature of the reactor is controlled at 50 ℃, and the time of passing into the atomized solution is 15 minutes,

[0040] The obtained coating content of lithium zinc phosphate is 0.73%.

[0041] The positive electrode material of the lithium-ion battery prepared in this example is nickel-cobalt-manganese-lithium oxide coated with metal phosphate, the nickel-cobalt-manganese lithium oxide has a layered crystal structure, and the chemical composition is LiNi 1-x-y co x mn y o 2 , wherein x=0.3, y=0.3 The particle size distribution of the nickel-cobalt-manganese-lithium oxide powder material is 5-10 microns. The metal phosphate of the coating is zinc phosphate, and the...

Embodiment 3

[0043] Embodiment 3: the preparation method of lithium-ion battery cathode material of the present embodiment:

[0044] The treatment steps of Example 3 and Example 1 are the same, except that 10 wt% zinc phosphate aqueous solution is atomized and then passed into the reaction chamber, and the temperature of the reactor is controlled at 65°C. Then increase the temperature of the fluidized bed reactor to 400°C and keep it for 0.8 hours, thus obtaining a zinc phosphate coating content of 0.96%. Charge and discharge at a rate of 0.2C for 50 cycles, the voltage is 2.7 - 4.2V, the ambient temperature of the charge and discharge test is 55°C, the 0.2C discharge capacity of the battery is 167 mAh / g, and the battery capacity retention rate after 50 cycles of the battery is 95.7%.

[0045] The positive electrode material of the lithium-ion battery prepared in this example is nickel-cobalt-manganese-lithium oxide coated with metal phosphate, the nickel-cobalt-manganese lithium oxide has...

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Abstract

The invention discloses a lithium ion battery anode material and a manufacturing method of the lithium ion battery anode material. The anode material is cobalt nickel oxide manganese with a layer structure and has the chemical composition of LiNil-x-yCoxMnyO2, wherein x is equal to and larger than 0.15 and is equal to and less than 0.3, and y is equal to and larger than 0.2 and is equal to and less than 0.4. The manufacturing method provided by the invention has the following steps: the cobalt nickel oxide manganese powder is manufactured through a coprecipitation method, metal phosphate is adopted as a cladding material with the cladding quantity as 0.5-1.5% of the anode material; and the cobalt nickel oxide manganese is externally cladded by zinc phosphate through fluidization. The cladded battery material after modification with the manufacturing method has high special capacity and has good cycling stability at high temperature.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly due to their advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, no memory effect and environmental protection. Thin, short, multi-functional portable electronic products are rapidly popularized in applications, and gradually expand to the fields of electric vehicles, hybrid electric vehicles and high-efficiency energy storage systems. [0003] Lithium cobalt oxide (LiCoO 2 ) is the earliest and most widely used cathode material for lithium-ion batteries, but its use in the field of power batteries is limited due to issues such as cost, safety, and rate performance. In 1999, Z. Liu reported for the first time a ternary transition metal oxide with a layered structure—nick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/10
Inventor 王剑华王宇郭玉忠黄瑞安
Owner KUNMING UNIV OF SCI & TECH
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