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Graphite negative electrode material for low temperature, preparation method thereof and lithium battery

A graphite anode and graphite material technology, applied in the directions of graphite, battery electrodes, secondary batteries, etc., can solve problems such as slow kinetic process, and achieve the effect of simple and easy method, conducive to infiltration, and satisfying user experience

Active Publication Date: 2022-04-12
SHAANXI COAL & CHEM TECH INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At low temperature, Li + The kinetic processes such as liquid phase transport and charge transfer are slow, and a large amount of Li + Gather on the surface of the graphite negative electrode, and reach the Li deposition potential under the action of polarization, thus forming lithium dendrites on the graphite surface, which induces safety risks

Method used

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  • Graphite negative electrode material for low temperature, preparation method thereof and lithium battery
  • Graphite negative electrode material for low temperature, preparation method thereof and lithium battery
  • Graphite negative electrode material for low temperature, preparation method thereof and lithium battery

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preparation example Construction

[0040] The present invention provides a method for preparing a low temperature graphite anode material, comprising the steps of:

[0041] S1: The organic nitrogen-containing metal frame compound containing cobalt is constructed in the surface of the graphite to obtain a graphite material of coating a nitrogen-containing organic metal frame compound (i.e., ZiF-67), i.e., graphite @ ziF-67.

[0042] The median particle diameter (D50) of the graphite can preferably be 4 to 13 um graphite.

[0043] Among them, the nitrogen-containing organic metal frame compounds of cobalt can be soluble with a nitrogen-containing organic compound in the surface of the graphite. Among them, soluble cobalt salt is preferably one or more of sulfate, cobalt nitrate, and cobalt chloride, preferably 2-methylimidazole. Preferably, the surface of the graphite can be treated with an anionic surfactant, CO 2+ Adsorbed on the surface of graphite, then add 2-methylimidazole to react, CO 2+ The distribution will ...

Embodiment 1

[0058] A method for preparing a low temperature graphite anode material, comprising the steps of:

[0059] S1: Pretreatment was carried out by a graphite surface of D50 of 4 to 6 um using sodium D50, wherein sodium dodecyl sulfonate and graphite were 1: 0.7. The mass concentration of sodium dodecyl sulfonate was 8 g / L, and NaCl was dissolved with 0.3 mol / L.

[0060] S2: Cobalt chloride and 2-methylimidazole were formed by hydrothermalization of the graphite surface after pretreatment, and a graphite material coated with ZIF-67 was obtained. Among them, 0.3 mmol of cobalt chloride was added to 1 g of cobalt chloride, and the molecular ratio of 2-methylimidazole was 1: 5. The thickness of the formed ZIF-67 coating is 60 nm. Micro-morphology figure 1 As shown, it is possible to see that ZIF-67 is successfully loaded on the surface of the graphite, which is a polyhedron structure, and the particle size is about 200 nm.

[0061] S3: Pyrolysis treatment of graphite materials coated ...

Embodiment 2

[0068] A method for preparing a low temperature graphite anode material, comprising the steps of:

[0069] S1: Pretreatment of a graphite surface of D50 of 5 to 8 um using polystyrene sulfonate, wherein the mass ratio of sodium polystyrene sulfonate and graphite is 1: 1. The mass concentration of sodium polystyrene sulfonate is 22 g / L, and NaCl is dissolved with 0.7 mol / L.

[0070] S2: Through the cobalt sulfate and 2-methylimidazole in the pretreated graphite surface, ZIF-67 is formed by hydrothermal method, resulting in a graphite material coated with ZIF-67. Among them, 0.5 mmol of cobalt sulfate is added, the molar ratio of cobalt sulfate and 2-methylimidazole is 1: 7. The thickness of the formed ZIF-67 coating is 100 nm.

[0071] S3: Pyrolysis treatment of graphite materials coated with ZIF-67 at a temperature of 700 ° C to obtain a graphite negative electrode material for a low temperature.

[0072] The lithium battery was prepared using the graphite anode material and t...

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Abstract

The invention discloses a graphite negative electrode material used at low temperature, a preparation method thereof and a lithium battery, and the graphite negative electrode material is prepared by the following steps: constructing a nitrogen-containing organic metal framework compound containing cobalt on the surface of graphite to obtain a graphite material of the nitrogen-containing organic metal framework compound coated with cobalt; and carrying out pyrolysis treatment on the graphite material of the nitrogen-containing organic metal framework compound coated with cobalt to obtain the graphite negative electrode material used at low temperature. The surface of the graphite negative electrode material has a porous structure, and the porous structure is beneficial to infiltration and liquid retention of an electrolyte, strengthens liquid-phase transportation of Li < + >, and enhances the feasibility of the graphite negative electrode material in use at low temperature. Meanwhile, the surface of the graphite negative electrode material contains elemental cobalt, a cobalt-nitrogen multi-element ligand and graphitized porous carbon, and the composition is beneficial to charge transmission. And the lithium ion battery can be normally used in an environment of-40 DEG C to 50 DEG C, so that the application in a low-temperature scene is effectively met.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion batteries involving a graphite negative electrode material for low temperature and a preparation method thereof and a lithium battery. Background technique [0002] Due to the significant advantages such as high energy density and long cycle life, the lithium ion battery has been more and more widely used in daily production and life. When the graphite is lithium, there are three steps, one is Li + Transport transport into the electrolyte to graphite / electrolyte interface, two is Li + After the solvation process at the interface, the charge transfer step of the electron process, the third is Li + The solid phase diffusion process inside the graphite lattice. Under low temperature conditions, Li + The kinetic process such as liquid phase transportation and charge transfer is slow, a large number of Li + The gathered in the surface of the graphite and reached the Li deposition potential und...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/60H01M4/38H01M10/0525C01B32/21
CPCY02E60/10
Inventor 高昕瑾胡朝文邵乐谢科予沈超路通胡秋晨米吉福张秦怡张贵录
Owner SHAANXI COAL & CHEM TECH INST
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