Novel green lithium iron phosphate precursor as well as preparation method and application thereof

A lithium iron phosphate and precursor technology, which is applied in the field of new green lithium iron phosphate precursor and its preparation, can solve the problems that the solid content of lithium iron phosphate is difficult to control, the viscosity cannot be stirred, and the process cost is high, and the solid content can be improved. , low cost, high charge and discharge rate

Pending Publication Date: 2022-01-07
上海量孚新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to solve the problem in the prior art that when iron phosphate is used as raw material to prepare lithium iron phosphate, the solid content is relatively low, resulting in high process cost; when iron powder is used as raw material to prepare lithium iron phosphate, the solid content is difficult to control so that the reaction It can be carried out smoothly, and the energy consumption of the follow-up process can be reduced, and a new type of green lithium iron phosp

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  • Novel green lithium iron phosphate precursor as well as preparation method and application thereof
  • Novel green lithium iron phosphate precursor as well as preparation method and application thereof
  • Novel green lithium iron phosphate precursor as well as preparation method and application thereof

Examples

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Example Embodiment

[0060] Example 1

[0061] (1) According to the molar ratio of iron element to phosphorus element is 0.96:1, add 6.895kg of 85% industrial grade phosphoric acid into 5L deionized water and stir to dilute to 49% concentration, slowly add 3.25kg of 200 mesh, The secondary reduced iron powder with a purity of 99% is reacted at 45°C, some gas will be generated during the reaction, and the color of the reactant will gradually change from gray black to gray white. When there is no gas generated in the reaction, put the material into the sand mill for sand grinding. The grinding beads in the sand mill are 0.3mm zirconia beads. During the sand grinding process, the viscosity gradually increases to 15000cps, and the color gradually becomes pure white. , to obtain product A.

[0062] 2. According to the molar ratio of lithium and phosphorus elements of 1.04:1, dissolve 4kg of citric acid in 3.25kg of deionized water to make a solution, and gradually add 2.3kg of battery-grade lithium ca...

Example Embodiment

[0068] Example 2

[0069] 1. According to the molar ratio of iron element to phosphorus element is 0.98:1, add 13.8kg of 85% food-grade phosphoric acid into 5L deionized water and stir to dilute to 62.4% concentration, slowly add 6.6kg of 250 mesh, purity 99.5% secondary reduced iron powder is reacted at 35°C, some gas will be generated during the reaction process, and the color of the reactant will gradually change from gray black to gray white. When there is no gas generated in the reaction, put the material into the sand mill for sand grinding. The grinding beads in the sand mill are 0.4mm zirconia beads. During the sand grinding process, the viscosity gradually increases to 20000cps, and the color gradually becomes pure white. Product A is obtained.

[0070] 2. According to the molar ratio of lithium and phosphorus elements of 1.03:1, dissolve 4kg of citric acid and 4kg of oxalic acid in 5kg of deionized water to make a solution, and mix 2kg of glucose and 5.18kg of indus...

Example Embodiment

[0074] Example 3

[0075] 1. According to the molar ratio of iron element to phosphorus element is 1:1, add 27.6kg of 85% food-grade phosphoric acid into 12L deionized water and stir to dilute the concentration to 59.2%. Slowly add 13.5kg of 300-mesh phosphoric acid with a purity of 99.7% while stirring. % electrolytic iron powder, react at 55°C, some gas will be generated during the reaction, and the color of the reactant will gradually change from gray black to gray white. When no gas is generated during the reaction, the material is put into a ball mill for ball milling. During the ball milling process, its viscosity gradually increases to 10,000 cps, and its color gradually turns into pure white to obtain product A.

[0076] 2. According to the molar ratio of lithium and phosphorus elements of 1.02:1, dissolve 6kg of malic acid and 7kg of tartaric acid in 5kg of deionized water to make a solution, and gradually mix 4kg of polyethylene glycol and 9.03kg of industrial grade ...

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Abstract

The invention discloses a novel green lithium iron phosphate precursor as well as a preparation method and application thereof. The preparation method of the lithium iron phosphate precursor comprises the following steps: S1, reacting a mixture of an iron source and a phosphoric acid solution, and grinding after the reaction is completed to obtain a product A; reacting a mixture of an organic acid solution, a lithium source and a carbon source to obtain a product B after the reaction is completed; wherein the preparation sequence of the product A and the product B is not limited; and S2, grinding the mixture of the product A and the product B to obtain the lithium iron phosphate precursor. In the preparation process of the lithium iron phosphate precursor, the solid content can be greatly increased, the energy consumption of the subsequent process is small, and the preparation method is simple; the cost is low; and the prepared lithium iron phosphate precursor is extremely small in particle size and high in charge-discharge rate.

Description

technical field [0001] The invention provides a novel green lithium iron phosphate precursor and its preparation method and application. Background technique [0002] In recent decades, people around the world have actively developed lithium-ion power battery materials for use in transportation tools, such as electric vehicles and electric bicycles. The research on the power battery as vehicle power has become the main bottleneck in the development of power vehicles. Based on cost-effective considerations, lithium-ion batteries have great advantages. Lithium iron phosphate (LiFePO 4 ), also known as lithium iron phosphate, due to factors such as cycleability, price, safety, and specific energy, LiFePO 4 The material has many advantages such as stable structure, rich source of raw materials, environmental friendliness and low cost, 170mAh / g theoretical capacity, 3.5V stable discharge platform, etc., especially its safety performance and cycle life are unmatched by other ma...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525H01M2004/028C01P2002/72C01P2004/03C01P2004/61C01P2006/40Y02E60/10
Inventor 不公告发明人
Owner 上海量孚新能源科技有限公司
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