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Lithium battery positive electrode material and preparation method thereof

A cathode material, lithium battery technology, applied in battery electrodes, active material electrodes, chemical instruments and methods, etc., to achieve easy control, improve low-temperature electrochemical performance, and reduce low-temperature impedance.

Active Publication Date: 2022-05-17
FOSHAN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above improved technologies did not make LiFePO 4 The battery meets the requirements of practical application at low temperature

Method used

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  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This embodiment provides a method for preparing a lithium battery positive electrode material, comprising the following steps:

[0084] (1) Take 148.68g Li 2 CO 3 , 224.93g Fe 2 o 3 , 600g (NH 4 ) 3 PO 4 , 104.96gMnO 2 , dissolved in a solution containing complexing agent, mixed evenly, and prepared LiMn by liquid phase method 0.3 Fe 0.7 PO 4 Precursor.

[0085] The complexing agent can be one or more of citric acid, tartaric acid, succinic acid, oxalic acid, sulfosalicylic acid and lactic acid, and citric acid is used in this embodiment.

[0086] (2) LiMn 0.3 Fe 0.7 PO 4 The precursor is added to water and mixed evenly. The ratio of the precursor to water is: the amount of water used is 100% of the mass of the precursor; then sand milled, and then passed through a 3000-mesh sieve, and the obtained filtrate is the slurry.

[0087] (3) The filtrate was pumped into the reaction kettle with a carbon material three-dimensional grid by a metering pump at a rate...

Embodiment 2

[0099] This embodiment provides a method for preparing a lithium battery positive electrode material, comprising the following steps:

[0100] (1) Take 148.68g Li 2 CO 3 , 224.93g Fe 2 o 3 , 600g (NH 4 ) 3 PO 4 , 104.96gMnO 2 , dissolved in a solution containing citric acid and mixed evenly, and the LiMn was obtained by the liquid phase method 0.3 Fe 0.7 PO 4 Precursor.

[0101] (2) LiMn 0.3 Fe 0.7 PO 4 Add the precursor to water, the ratio of the precursor to water is: the amount of water is 150% of the mass of the precursor, then add 25.89g of sucrose and mix evenly, sand mill and pass through a 3000-mesh screen to obtain the filtrate, which is the slurry .

[0102] (3) The filtrate is pumped from the upper, middle and lower parts of the reactor by a metering pump at a speed of 1mL / min. The reactor used is the same as in Example 1, and the carbon material three-dimensional grid 3 is formed by interconnecting carbon fiber filaments with a diameter of 3nm. netwo...

Embodiment 3

[0105] This embodiment provides a method for preparing a lithium battery positive electrode material, comprising the following steps:

[0106] (1) Take 727.51g Li 2 CO 3 , 1493.66g Fe 2 o 3 , 4000g (NH 4 ) 3 PO 4 , 85.60gMnO 2 , dissolved in a solution containing citric acid, mixed evenly, and prepared LiMn by liquid phase method 0.05 Fe 0.95 PO 4 Precursor.

[0107] (2) LiMn 0.05 Fe 0.95 PO 4 Add the precursor to water, and the ratio of the precursor to water is as follows: the amount of water is 100% of the mass of the precursor, and then 75.68g of glucose is added to mix evenly, sand-milled and passed through a 2500-mesh sieve, and the obtained filtrate is the slurry.

[0108] (3) The filtrate is pumped from the upper, middle and lower parts of the reactor by a metering pump at a speed of 1mL / min. The reactor used is the same as in Example 1, and the carbon material three-dimensional grid 3 is formed by interconnecting carbon fiber filaments with a diameter of ...

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Abstract

The invention belongs to the technical field of lithium battery materials, and particularly discloses a lithium battery positive electrode material and a preparation method thereof. The lithium battery positive electrode material is prepared by adopting a reaction kettle with a carbon material three-dimensional grid. According to the lithium battery positive electrode material provided by the invention, a plurality of long-range orderly through and communicated pore channels are formed in the positive electrode material. The electrochemical performance of the battery at low temperature can be improved by directionally constructing a long-range ordered pore channel in the positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a lithium battery cathode material and a preparation method thereof. Background technique [0002] LiFePO 4 The positive electrode material has a wide range of raw materials, no environmental pollution, good safety performance, and long cycle life, making it stand out among many lithium-ion battery cathode materials, and is considered to be one of the most promising lithium-ion battery cathode materials. Using LiFePO 4 The manufactured lithium-ion battery has high safety performance, is suitable for use as a power battery, and has good medium-rate cycle performance, and the cycle life can reach thousands of times. [0003] However, LiFePO 4 As a power battery, lithium-ion batteries have poor low-temperature performance, which affects LiFePO 4 Application of lithium-ion batteries in low-temperature special environments. According to the analysis,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/02H01M4/58B82Y30/00B82Y40/00
CPCC01B25/45H01M4/02H01M4/5825B82Y30/00B82Y40/00H01M2004/021C01P2002/72C01P2004/04C01P2004/61C01P2006/16C01P2004/64C01P2006/14C01P2006/40Y02E60/10
Inventor 徐荣益李亨利孔令涌李意能刘其峰
Owner FOSHAN DYNANONIC
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