Positive material for lithium ion battery, preparation method of material, and lithium ion battery

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of LiMnPO4 electrochemical performance to be improved, and achieve high specific energy, performance improvement, and high specific capacity.

Active Publication Date: 2013-08-21
TIANJIN B&M SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, LiMnPO synthesized by this method 4 The electrochemical performance of the

Method used

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  • Positive material for lithium ion battery, preparation method of material, and lithium ion battery
  • Positive material for lithium ion battery, preparation method of material, and lithium ion battery
  • Positive material for lithium ion battery, preparation method of material, and lithium ion battery

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preparation example Construction

[0030] The invention provides a kind of preparation method of lithium-ion battery cathode material, comprises the following steps:

[0031] a) providing nano-lithium phosphate, the nano-lithium phosphate has a hollow structure;

[0032] b) Mix the nano-lithium phosphate, soluble manganese source compound, additives, water and polyalcohol mixed solvent provided in step a) and then ball mill to obtain a mixed solution, and then put the mixed solution in an inert gas-closed In the reaction kettle, heat preservation is carried out at a temperature of 150°C to 230°C to obtain lithium manganese phosphate;

[0033] c) mixing the lithium manganese phosphate obtained in the step b) with a carbon source compound, ball milling, and calcining to obtain a positive electrode material for a lithium ion battery with carbon-coated lithium manganese phosphate.

[0034]The preparation method of lithium manganese phosphate lithium ion battery cathode material provided by the present invention is...

Embodiment 1

[0072] The concentration is 2.5mol·L -1 LiOH·H 2 Add the O solution into the stirring reaction device, stir at a speed of 600rpm until the pH is stable, and then pass the peristaltic pump to a concentration of 1.1mol L -1 of phosphoric acid (H 3 PO 4 ) solution was added to the stirring reaction device at a feeding rate of 0.8mL / min for reaction, wherein, LiOH·H 2 O and H 3 PO 4 The molar ratio of the phosphoric acid solution is 3:1. After the phosphoric acid solution is added, it is stirred at a speed of 300rpm for 30min, and the reaction generates a precipitate. The precipitate is washed, suction filtered and dried to obtain white Li 3 PO 4 powder.

[0073] will get Li 3 PO 4 The powder was analyzed by SEM, the results can be found in figure 1 and figure 2 , figure 1 For the Li obtained in Example 1 of the present invention 3 PO 4 SEM image at 30.0k, figure 2 For the Li obtained in Example 1 of the present invention 3 PO 4 SEM image at 100k. Depend on fi...

Embodiment 2

[0080] The concentration is 2.5mol·L -1 LiOH·H 2 Add the O solution into the stirring reaction device, stir at a speed of 600rpm until the pH is stable, and then pass the peristaltic pump to a concentration of 1.1mol L -1 LiH 2 PO 4 The solution was added into the stirring reaction device at a feeding rate of 0.8mL / min for reaction, wherein, LiOH·H 2 O and LiH 2 PO 4 The molar ratio of LiH is 2:1, when LiH 2 PO 4 After the solution was added, it was stirred at a speed of 300rpm for 30min, and a precipitate was formed in the reaction, which was washed, filtered and dried to obtain white Li 3 PO 4 powder.

[0081] According to the molar ratio of 1:1, the Li 3 PO 4 Powder and MnCl 2 Transfer to a polyurethane ball mill tank, add 0.45g of ascorbic acid, and then add 60mL of a mixed solvent composed of water and 1,4-butanediol, wherein the molar ratio of the water to 1,4-butanediol is 200, and carry out liquid phase Ball milled for 0.5h to obtain a mixed solution, and ...

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Abstract

The invention provides a positive material for a lithium ion battery and a preparation method thereof. The method comprises the following steps of: providing nano lithium phosphate with a hollow structure; mixing the nano lithium phosphate, a soluble manganese source compound and an additive with a mixed solvent of water and polyhydric alcohol; carrying out ball milling to obtain a mixed solution; then keeping heat of the mixed solution in a closed reaction kettle filled with inert gas under the condition that the temperature is 150-230 DEG C to obtain lithium phosphate; mixing the lithium phosphate with a carbon source compound and carrying out the ball milling; and calcining to obtain the positive material for the lithium ion battery of carbon coated lithium phosphate. According to the positive material and the preparation method thereof disclosed by the invention, polyhydric alcohol-hydrothermal reaction between a solid and liquid can be carried out on the lithium phosphate and the soluble manganese source compound, so that the grain diameter of a lithium phosphate crystal is effectively reduced and a crystal form of the lithium phosphate crystal is integrally formed; and furthermore, the positive material for the lithium ion battery with high specific capacity and specific energy can be obtained and is good for popularization. The invention further provides the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] The continuous development of new energy is an important basis for the sustainable development of human society. With the advancement of science and technology, people's demand for mobile energy, especially for pure electric vehicles has been continuously strengthened with the intensification of oil and environmental crises. However, the current secondary chemical power supply technology that is cheap, safe, environmentally friendly, and excellent in performance has become a bottleneck restricting the development of pure electric vehicles. In the lithium ion battery material positive electrode material that can be used as a secondary chemical power source, although the layered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58H01M10/0525
CPCY02E60/10
Inventor 徐宁崔玉听宋英杰陈丽吴孟涛
Owner TIANJIN B&M SCI & TECH
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