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Bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as unsuitable for large-scale promotion, difficult surface modification process, and large loss of material capacity, so as to maintain the integrity of particle structure Sex, reduce adverse side effects, good recovery effect

Active Publication Date: 2021-05-28
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing technology removes residual alkali on the surface, the process is cumbersome and complicated, the energy consumption is large, and the effect is not satisfactory
Especially for high-nickel single-crystal cathode materials, the surface modification process is more difficult due to the high nickel content, the limitation of crystal grains and crystal forms.
After treatment, the capacity loss of the material is large, and the competitiveness in the high-energy-density lithium battery market plummets
In general, the current method for removing residual alkali on the surface has low operability and low cost performance, and is not suitable for large-scale promotion

Method used

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  • Bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and preparation method thereof
  • Bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and preparation method thereof
  • Bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) 0.408g of Al(NO 3 ) 3 9H 2 O and 0.1436g (NH 4 ) 2 HPO 4 Dissolve slowly in 5g of water and stir until white AlPO is produced 4 precipitation.

[0057] (2) Continue to add 0.0144g (NH 4 ) 2 HPO 4 and 25g of cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Into the above solution, magnetically stirred at room temperature for 5 min.

[0058] (3) Take off the water heating oven transferred to 120°C, dry for 6 hours, remove the solvent, crush it with a mortar, put it in a tube furnace at 650°C in an oxygen atmosphere, and calcinate for 5 hours to obtain the bifunctional interface modified Nickel-rich single crystal cathode material.

Embodiment 2

[0060] (1) 0.408g of Al(NO 3 ) 3 9H 2 O and 0.1436g (NH 4 ) 2 HPO 4 Dissolve slowly in 5g of water and stir until white AlPO is produced 4 precipitation.

[0061] (2) Continue to add 0.0072g (NH 4 ) 2 HPO 4 and 25g of cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Into the above solution, magnetically stirred at room temperature for 5 min.

[0062] The other steps were the same as in Example 1 to prepare a nickel-rich single crystal positive electrode material with dual-functional interface modification.

Embodiment 3

[0064](1) 0.408g of Al(NO 3 ) 3 9H 2 O and 0.1436g (NH 4 ) 2 HPO 4 Dissolve slowly in 5g of water and stir until white AlPO is produced 4 precipitation.

[0065] (2) Continue to add 0.0288g (NH 4 ) 2 HPO 4 and 25g of cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Into the above solution, magnetically stirred at room temperature for 5 min.

[0066] The other steps were the same as in Example 1 to prepare a nickel-rich single crystal positive electrode material with dual-functional interface modification.

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Abstract

The invention provides a bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and a preparation method thereof. According to the method, a certain amount of aluminum source and phosphate are added into a nickel-rich single crystal positive electrode material, and a bifunctional coating layer of AlPO4 and Li3PO4 is formed while surface residual alkali (Li2CO3 / LiOH) is consumed. By controlling the adding amount of the aluminum source and the phosphate and adjusting and controlling the adding mode and the calcining method, the direct contact between the active material and an electrolyte can be reduced, gas production is inhibited, and the thermal stability of the material is improved; and the transmission of ions between the positive electrode and the electrolyte can be accelerated, the stress change in a charging and discharging process is relieved, and the rate capability of the material is improved. According to the method, a bifunctional interface modification layer is obtained, the electrochemical performance of the nickel-rich single crystal positive electrode material is improved through the synergistic effect of the bifunctional interface modification layer; operation is easy and convenient; and raw materials are cheap and easy to obtain. The method is suitable for large-scale commercialization of the nickel-rich single crystal positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a nickel-rich single-crystal cathode material and a preparation method thereof for a lithium-ion battery with low residual alkali and high safety controlled by a dual-functional interface. Background technique [0002] Since the commercialization of lithium-ion batteries in 1991, with the rise of lithium batteries, portable electronic devices have been greatly developed. But the current popular cathode material is still LiFePO 4 and LiCoO 2 . With the rapid development of 3C electronic products and electric vehicles, it is urgent to develop cathode materials with low cost, high safety and high energy density. LiNi 0.8 co 0.1 mn 0.1 o 2 (NCM) has been extensively studied by many researchers due to its high energy density (≥800Wh / kg), low cost, high rate performance, and environmental friendliness. However, during the preparation and storage of nickel-rich sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 郭玉国杜亚豪石吉磊盛航曹菲菲
Owner INST OF CHEM CHINESE ACAD OF SCI
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