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A kind of bifunctional interface lithium ion battery nickel-rich single crystal cathode material and preparation method

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, large loss of material capacity, etc., to maintain the integrity of the particle structure Sex, reduce adverse side effects, good recovery effect

Active Publication Date: 2022-08-02
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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  • A kind of bifunctional interface lithium ion battery nickel-rich single crystal cathode material and preparation method
  • A kind of bifunctional interface lithium ion battery nickel-rich single crystal cathode material and preparation method
  • A kind of bifunctional interface lithium ion battery nickel-rich single crystal cathode material and preparation method

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 Slowly dissolve in 5 g 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 positive electrode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 into the above solution, and magnetically stirred at room temperature for 5 min.

[0058] (3) Remove the hydrothermal oven transferred to 120°C, dry for 6h, remove the solvent, crush it with a mortar, put it into a tube furnace under an oxygen atmosphere at 650°C, and calcine it for 5h to obtain a 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 Slowly dissolve in 5 g 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 positive electrode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 into the above solution, and magnetically stirred at room temperature for 5 min.

[0062] Other steps are the same as in Example 1, to prepare a nickel-rich single crystal cathode material with bifunctional interface modification.

Embodiment 3

[0064](1) 0.408g of Al (NO 3 ) 3 ·9H 2 O and 0.1436g (NH 4 ) 2 HPO 4 Slowly dissolve in 5 g 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 positive electrode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 into the above solution, and magnetically stirred at room temperature for 5 min.

[0066] Other steps are the same as in Example 1, to prepare a nickel-rich single crystal cathode material with bifunctional interface modification.

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Abstract

The invention provides a nickel-rich single crystal positive electrode material for a dual-function interface lithium ion battery and a preparation method. (Li2CO3 / LiOH) simultaneously forms bifunctional cladding layers of AlPO4 and Li3PO4. By controlling the amount of aluminum source and phosphate added, as well as the adjustment and control of the adding method and calcination method, it can not only reduce the direct contact between the active material and the electrolyte, suppress gas production, and improve the thermal stability of the material; The transmission between the positive electrode and the electrolyte relieves the stress change during the charging and discharging process and improves the rate performance of the material. The method of the invention obtains a bifunctional interface modification layer, and by utilizing the synergistic effect of the two, the electrochemical performance of the nickel-rich single crystal positive electrode material is improved, the operation is simple, the raw materials are cheap and easy to obtain, and it is suitable for the nickel-rich single crystal positive electrode Materials are commercialized on a large scale.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a low-residual-alkali, high-safety lithium-ion battery nickel-rich single-crystal positive electrode material and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in 1991, portable electronic devices have come a long way with the rise of lithium-ion batteries. But the current popular cathode material is still LiFePO 4 and LiCoO 2 . With the rapid development of 3C electronics and electric vehicles, there is an urgent need 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 high energy density (≥800Wh / kg), low price, high rate performance and environmental friendliness, so it has been widely studied by many researchers. However, during the preparation and storage of nickel-rich single-crystal cathode materials, CO 2 and H 2 A la...

Claims

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Application Information

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Patent Type & Authority Patents(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