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Composite phosphate coated lithium ion battery high-nickel positive electrode material and preparation method thereof

A lithium-ion battery and composite phosphate technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor safety and cycle life, harsh use environment requirements, and low coulombic efficiency in the first cycle, and achieve Effects of suppressing irreversible phase transition and microcracks, low manufacturing cost, and suppressing irreversible capacity loss

Pending Publication Date: 2021-09-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages of poor processability of high-nickel cathode materials for lithium-ion batteries, harsh requirements on the use environment, poor cycle stability, low first-cycle Coulombic efficiency, sharp decline in high-temperature performance, and poor safety and cycle life. A kind of composite phosphate-coated lithium-ion battery high-nickel cathode material and preparation method thereof

Method used

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  • Composite phosphate coated lithium ion battery high-nickel positive electrode material and preparation method thereof
  • Composite phosphate coated lithium ion battery high-nickel positive electrode material and preparation method thereof
  • Composite phosphate coated lithium ion battery high-nickel positive electrode material and preparation method thereof

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Embodiment 1

[0049] This embodiment provides a kind of composite phosphate coated lithium-ion battery high-nickel cathode material LiNi 0.9 co 0.1 o 2 , among which, the high-nickel cathode material LiNi for lithium-ion batteries 0.9 co 0.1 o 2 As the parent material, yttrium metaphosphate Y (PO 3 ) 3 For coating raw materials, Y(PO 3 ) 3 Residual alkali (LiOH, Li 2 CO 3 ) in-situ reaction to form a composite phosphate coating; the coating amount of yttrium metaphosphate is the parent cathode material LiNi 0.9 co 0.1 o 2 (Matrix material) of 2wt%.

[0050] The above-mentioned composite phosphate-coated lithium-ion battery high-nickel cathode material LiNi 0.9 co 0.1 o 2 The preparation process such as figure 2 shown, including:

[0051] According to the coating amount, 0.04gY(PO 3 ) 3 Disperse in 30-40ml of absolute ethanol, and sonicate for 10-30min to form a suspension solution;

[0052] Then add 2.0g parent cathode material LiNi in the solution 0.9 co 0.1 o 2 , S...

Embodiment 2

[0060] This embodiment provides a kind of composite phosphate coated lithium-ion battery high-nickel cathode material LiNi 0.9 co 0.1 o 2 , the only difference between it and Example 1 is that the coating amount of yttrium metaphosphate is the parent cathode material LiNi 0.9 co 0.1 o 2 (Matrix material) 1 wt%; After testing, the principle and electrochemical performance of the positive electrode material provided in this embodiment are basically the same as those in Example 1.

Embodiment 3

[0062] This embodiment provides a kind of composite phosphate coated lithium-ion battery high-nickel cathode material LiNi 0.9 co 0.1 o 2 , the only difference between it and Example 1 is that the coating amount of yttrium metaphosphate is the parent cathode material LiNi 0.9 co 0.1 o 2 (Matrix material) 3wt%; After testing, the principle and electrochemical performance of the positive electrode material provided in this example are basically the same as those in Example 1.

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Abstract

The invention belongs to the technical field of preparation of a lithium ion battery positive electrode material, and provides a composite phosphate coated lithium ion battery high-nickel positive electrode material and a preparation method thereof, which aim to overcome the defects of poor processability, harsh requirements on use environment, poor cycle stability, low first-circle coulombic efficiency, sharp reduction of high-temperature performance, poor safety and poor cycle life in the prior art. According to the composite phosphate coated lithium ion battery high-nickel positive electrode material, Yttrium metaphosphate Y(PO3) 3 is used as a coating raw material, and a composite multifunctional phosphate coating layer is generated through in-situ reaction of Y(PO3)3 and residual alkali (LiOH and Li2CO3) on the surface of a parent material, so that lithium salt residues on the surface of the parent material are greatly reduced, the processability is improved, the requirement on a use environment is reduced, the ionic conductivity of the positive electrode material is increased, and phase change and interface side reaction are effectively inhibited; therefore, the lithium phosphate coated lithium ion battery high-nickel positive electrode material has excellent specific discharge capacity and cycling stability, and especially can maintain relatively good electrochemical performance at high temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery cathode materials, relates to coating modification of lithium-ion battery high-nickel (molar ratio Ni≥80%) cathode materials, and specifically provides a composite phosphate-coated lithium-ion battery high-nickel cathode Materials and their preparation methods. Background technique [0002] In recent years, problems such as the depletion of non-renewable energy and the global warming effect have prompted people to continuously develop and utilize clean energy; lithium-ion batteries have the advantages of high energy density, light weight, and environmental protection, and are more and more respected by people, especially It is used for new energy vehicles; the development of new energy vehicles has become the main direction of the transformation and development of the global automobile industry, and it is also a strategic measure to deal with the climate change crisis an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M4/505H01M4/62H01M10/0525C01B25/30C01B25/37C01B25/44C01G53/00
CPCH01M4/366H01M4/525H01M4/505H01M4/485H01M4/628H01M4/624H01M10/0525C01B25/30C01B25/37C01B25/44C01G53/42C01G53/50C01P2002/72C01P2004/03H01M2004/021H01M2004/028Y02E60/10
Inventor 刘兴泉李蕾程文栋郝帅纪煜垚肖雨何泽珍
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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