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Preparation method of LiFePO material, lithium ion battery and positive plate thereof

A technology of lithium iron phosphate and positive electrode sheet, which is applied in the preparation of lithium iron phosphate material and the field of lithium ion battery and its positive electrode sheet, and can solve the problems that cannot satisfy the application of high power lithium ion battery

Active Publication Date: 2010-11-24
STARZEON ELECTRONICS DONGGUAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of these conductive agents improves the conductivity of LiFePO4 in practical applications to a certain extent, it still cannot meet the requirements of high-power lithium-ion batteries.

Method used

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  • Preparation method of LiFePO material, lithium ion battery and positive plate thereof
  • Preparation method of LiFePO material, lithium ion battery and positive plate thereof
  • Preparation method of LiFePO material, lithium ion battery and positive plate thereof

Examples

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no. 1 approach

[0022] The following describes the process of preparing the lithium iron phosphate / aluminum composite material according to the first embodiment of the present invention by using the mechanical ball milling mixing method.

[0023] The method for preparing lithium iron phosphate / aluminum composite material according to the present invention comprises the steps of: step one, sintering to prepare lithium iron phosphate powder; step two, preparing nano-Al powder; step three, combining nano-Al powder with sintering The final lithium iron phosphate powder is subjected to high-speed ball milling and dispersion under the protection of an inert atmosphere; step 4, inert gas or reducing gas is passed into the tube furnace, and the mixture of Al powder and lithium iron phosphate powder is sintered and kept warm, so that Al is melted, so that the aluminum element is coated on the lithium iron phosphate powder particles to form a lithium iron phosphate / aluminum composite material; Step 5, the...

Embodiment 1～6

[0033] Preparation of LiFePO by Ball Milling 4 The specific process of the / Al composite material is as follows: 2 CO 3 , FeC 2 o 4 , NH 4 h 2 PO 4 Lithium iron phosphate LiFePO is sintered once as a raw material by high-temperature solid-state method 4 Material, the material after sintering is pulverized for the first time. According to the ball-to-material ratio of 3:1, two kinds of diameters of grinding balls Φ1 / Φ5 (in mm) are selected, and the dosage ratio is Φ1:Φ5=7:3. In an inert protective atmosphere glove box, LiFePO 4 Materials, nano-aluminum powder, grinding balls and organic solvents such as isopropanol, acetone, n-butanol, tert-butanol, and hexanediol are mixed and loaded into a ball mill tank, and the amount of aluminum powder is LiFePO 4 The amount of the material is 0.1-5%, the amount of the organic solvent is to completely cover the ball material, the liquid level is slightly higher than the ball material liquid level, the ball milling speed is 500-2000...

Embodiment approach

[0036] According to the second embodiment of the present invention, the process of preparing lithium iron phosphate / aluminum composite material by electroless plating will be described below.

[0037] In the method for preparing lithium iron phosphate / aluminum composite material by electroless plating according to the present invention, steps are included: Step 1, sintering to prepare lithium iron phosphate powder; Step 2, preparing aluminum metal molten salt electroplating solution, wherein the electroplating solution includes aluminum Metal room temperature molten salt, organic reducing agent, and an organic solvent that does not react with aluminum metal molten salt; step 3, prepare a chloride salt solution containing active metal Pd, Rh, Ru, etc., and add ethanol, propanol, ethylene glycol etc., prepare a mixture of alcohol and water to obtain an activation solution; Step 4, under an inert atmosphere, soak the lithium iron phosphate material in the above activation solution...

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Abstract

The invention discloses a preparation method of a LiFePO material, a lithium ion battery using the material and a positive plate thereof. The preparation method comprises the following steps: sintering to prepare LiFePO powder; cladding aluminum on the surface of the LiFePO powder particle to form a LiFePO-Al composite material. Compared with the prior art, the LiFePO material prepared by the invention and the cladding aluminum can carry out homodisperse and surface cladding at the molecule level; the conductivity of the electrode plate prepared by the invention is improved by 101-10001 times; and the internal resistance of the LiFePO lithium ion battery is reduced greatly, and the large-current charge-discharge property is obviously improved, thus the material is particularly suitable for a high power lithium ion battery. Compared with the other cladding elementary metal, Al metal is cheaper, has lighter mass, lower melting point, more stable electrochemistry property and the like; and in additional, the aluminum in the composite material and a positive pole current collector are made of the same material, so that primary battery corrosion effect can not be formed.

Description

technical field [0001] The present invention relates to a preparation method of a high-power power lithium-ion battery positive electrode material and a positive electrode sheet using the positive electrode material and a lithium-ion battery, in particular, the present invention relates to a lithium iron phosphate positive electrode in a high-power power lithium-ion battery A preparation method of the material, a positive electrode sheet and a lithium ion battery using the positive electrode material. Background technique [0002] In lithium-ion batteries, the selection and quality of cathode materials play a decisive role in the performance and price of lithium-ion batteries. Lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide (LiMn 2 o 4 ), lithium nickel oxide (LiNiO 2 ), nickel-cobalt-manganese-lithium multicomponent materials and lithium iron phosphate (LiFePO 4 ), where LiFePO 4 Because of its low price, environmental protection, excellent cycle performance,...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/1397H01M4/58H01M4/136H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 陈乐茵杨红平
Owner STARZEON ELECTRONICS DONGGUAN
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