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Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and its preparation, can solve problems such as poor conductivity, particle aggregation, lithium-nickel mixed discharge, etc., and achieve simple and easy preparation methods, excellent rate performance, and improved The effect of conductivity

Inactive Publication Date: 2019-08-02
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

However, because of the high content of nickel in high-nickel ternary materials, and the ionic radii of nickel ions and lithium ions are relatively close, the phenomenon of lithium-nickel mixing is prone to occur in the process of material preparation and electrochemical cycling, resulting in The instability of the material structure causes the material to break and pulverize
In addition, during the charge-discharge cycle, due to the direct contact between the electrolyte and the electrode material, a series of side reactions occur on the contact surface, resulting in the occurrence of surface phase transition, resulting in a gradual decline in the capacity of the battery.
[0003] In order to alleviate the above problems, the conventional approach is to coat the surface of the ternary cathode material. In terms of coating, wet chemical methods such as sol-gel and co-precipitation methods often introduce some impurities into the raw materials and cause some particles to aggregate. and irregular cracks, which affect the integrity of the coating; other methods such as chemical vapor deposition and atomic layer deposition can make the coating dense and continuous, but often the resulting coating is not porous and conductive is also poor, which hinders the transfer of lithium ions from the cladding layer to the inner active material

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

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preparation example Construction

[0028] see figure 1 and figure 2 , the preparation method of lithium ion battery cathode material provided by the invention mainly comprises the following steps:

[0029] Step 1, with the ternary precursor Ni x co y mn 1-x-y (OH) 2 and lithium salt as raw materials for mixing and roasting to obtain the ternary cathode material LiNi x co y mn 1-x-y o 2 .

[0030] Specifically, the ternary precursor Ni x co y mn 1-x-y (OH) 2 It is mixed with lithium salt according to a predetermined molar ratio, then ball milled, and then calcined under a predetermined atmosphere to obtain the ternary cathode material LiNi x co y mn 1-x-y o 2 . Among them, 0.5≤x≤0.8, 0.1≤y≤0.2.

[0031] More specifically, the Ni x co y mn 1-x-y (OH) 2and lithium salt according to the molar ratio of 1:1.5~1:1 into the ball mill for 0.5h~2h. Sintering at ~900°C for 10h~20h to obtain the ternary cathode material LiNi x co y mn 1-x-y o 2 .

[0032] In this embodiment, the lithium salt ma...

Embodiment 1

[0041] The preparation method of the lithium-ion battery cathode material provided by Example 1 of the present invention mainly includes the following steps:

[0042] S1, the Ni 6 co 2 mn 2 (OH) 2 Add lithium salt and lithium salt into the ball mill at a molar ratio of 1:1, the ball milling time is 1h, and the ball mill speed is 300r / min. After the ball milling is completed, the obtained product is put into a muffle furnace and sintered at 900°C for 10h to obtain a ternary positive electrode Material;

[0043] S2, configure the concentration of zinc nitrate and cobalt nitrate to be 50ml of methanol solution of 0.05mol / L and 0.01mol / L respectively, and pour 50ml of methanol solution of dimethylimidazole with a concentration of 0.2mol / L to obtain the mixed After standing for 24 hours, the bimetallic ZIF (BMZIF) containing metal cobalt and zinc was obtained by centrifugation, washing and drying.

[0044] In S3, the obtained ternary cathode material and the obtained BMZIF pow...

Embodiment 2

[0046] The preparation method of the lithium-ion battery positive electrode material provided by Example 2 of the present invention mainly includes the following steps:

[0047] S1, the Ni 6 co 2 mn 2 (OH) 2 Add lithium salt and lithium salt into the ball mill at a molar ratio of 1:1.3, the ball milling time is 1h, the ball mill speed is 300r / min, after the ball milling is completed, the obtained product is put into a muffle furnace and sintered at 800°C for 15h to obtain a ternary positive electrode Material;

[0048] S2, configure the concentration of zinc nitrate and cobalt nitrate to be 25ml of methanol solution of 0.04mol / L and 0.04mol / L respectively, and pour 50ml of methanol solution of dimethylimidazole with a concentration of 0.2mol / L to obtain the mixed After standing for 24 hours, the bimetallic ZIF (BMZIF) containing metal cobalt and zinc was obtained by centrifugation, washing and drying.

[0049] In S3, the obtained ternary cathode material and the obtained ...

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof, and belongs to the technical field of lithium ion battery cathode materials. The method comprises the following steps that (1) raw materials of a ternary precursor NixCoyMn1-x-y(OH)2 and lithium salt are mixed and roasted to obtain a ternary cathode material LiNixCoyMn1-x-yO2, 0.5<=x<=0.8, 0.1<=y<=0.2,and a methanol solution dissolved with cobalt salt and zinc salt are poured into a methanol solution with dimethyl imidazole, and processed to obtain a bimetallic organic frame structure with cobaltand zinc; and (3) the ternary cathode material LiNixCoyMn1-x-yO2 and the bimetallic organic frame structure are mixed uniformly and then burned to obtain the lithium ion battery cathode material wrapped in a bimetallic oxide. The lithium ion battery cathode material is stable in structure, and high in conductivity, and the power multiplying and circulation performances of the material are improved.

Description

technical field [0001] The invention belongs to the technical field related to lithium-ion battery cathode materials, and more specifically relates to a lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in all aspects of life, from portable electronic devices to electric vehicles and large-scale energy storage systems are inseparable from their existence. Therefore, in order to meet people's requirements for higher energy density, high safety and long life of batteries, how to develop new electrode materials and modify original commercial materials has become a research hotspot. At present, lithium cobalt oxide, lithium iron phosphate, and ternary materials are commonly used as cathode materials for lithium-ion batteries. The ternary materials NCM and NCA are expected to replace lithium cobalt oxide and NCA due to their higher discharge specific capacity and lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李箐陈仙王谭源
Owner HUAZHONG UNIV OF SCI & TECH
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