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A kind of graphite composite negative electrode material and preparation method thereof

A technology for negative electrode materials and composite material layers, which is applied in the field of graphite composite negative electrode materials and its preparation, can solve problems such as material cycle performance to be improved, and achieve the effects of improving first-time efficiency, increasing doping rate, and simple preparation methods

Active Publication Date: 2019-10-15
陕西君和聚源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle performance of the material obtained by this method needs to be improved.

Method used

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  • A kind of graphite composite negative electrode material and preparation method thereof
  • A kind of graphite composite negative electrode material and preparation method thereof
  • A kind of graphite composite negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The graphite composite negative electrode material of this embodiment is a core-shell structure, including an inner core, an outer shell, and a sodium fluoride composite material layer coated on the surface of the outer shell. The inner core is graphite, and the outer shell is a nitrogen-phosphorus-doped composite material layer. The heterocomposite material layer is formed by adding raw graphite into a nitrogen-containing ionic liquid dispersed with phosphorus-containing organic compounds, surfactants, and lithium salts, and sintering; the phosphorus-containing organic compounds, surfactants, lithium salts, and nitrogen-containing ions The mass ratio of the liquid is 30:3:3:200; the sodium fluoride composite material layer is mainly made of sodium fluoride, surfactant and binding agent, and the sodium fluoride, surfactant and binding agent The mass ratio is 8:3:3. The SEM figure of the graphite composite negative electrode material of the present embodiment is shown in...

Embodiment 2

[0043] The graphite composite negative electrode material of this embodiment is a core-shell structure, including an inner core, an outer shell, and a sodium fluoride composite material layer coated on the surface of the outer shell. The inner core is graphite, and the outer shell is a nitrogen-phosphorus-doped composite material layer. The heterocomposite material layer is formed by adding raw graphite into a nitrogen-containing ionic liquid dispersed with phosphorus-containing organic compounds, surfactants, and lithium salts, and sintering; the phosphorus-containing organic compounds, surfactants, lithium salts, and nitrogen-containing ions The mass ratio of the liquid is 10:1:1:200; the sodium fluoride composite material layer is mainly made of sodium fluoride, surfactant and binding agent, and the sodium fluoride, surfactant and binding agent The mass ratio is 5:1:5.

[0044] The phosphorus-containing organic compound is ammonium polyphosphate, the surfactant is coconut o...

Embodiment 3

[0051] The graphite composite negative electrode material of this embodiment is a core-shell structure, including an inner core, an outer shell, and a sodium fluoride composite material layer coated on the surface of the outer shell. The inner core is graphite, and the outer shell is a nitrogen-phosphorus-doped composite material layer. The heterocomposite material layer is formed by adding raw graphite into a nitrogen-containing ionic liquid dispersed with phosphorus-containing organic compounds, surfactants, and lithium salts, and sintering; the phosphorus-containing organic compounds, surfactants, lithium salts, and nitrogen-containing ions The mass ratio of the liquid is 50:5:5:200; the sodium fluoride composite material layer is mainly made of sodium fluoride, surfactant and binding agent, and the sodium fluoride, surfactant and binding agent The mass ratio is 10:5:10.

[0052] The phosphorus-containing organic compound is melamine polyphosphate, the surfactant is sodium ...

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Abstract

The invention relates to a graphite composite anode material and a preparation method thereof. The graphite composite anode material is of a core-shell structure and comprises an inner core and an outer shell, wherein the inner core is graphite; the outer shell is a nitrogen and phosphorus-doped composite material layer; the nitrogen and phosphorus-doped composite material layer is formed by adding the graphite serving as a raw material into nitrogen-containing ionic liquid in which a phosphorus-containing organic compound, a surfactant and lithium salt are dispersed and sintering; the mass ratio of the phosphorus-containing organic compound to the surfactant to the lithium salt to the nitrogen-containing ionic liquid is (10-50):(1-5):(1-5):200. The graphite composite anode material provided by the invention has the advantages that the transmission rate of lithium ions under the condition of high magnification can be improved, and the compatibility of the graphite composite anode material with an electrolyte can also be improved, so that the cycle performance is improved; the lithium salt in the outer shell can provide sufficient lithium ions, so that the first-time efficiency and the cycle performance are improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a graphite composite negative electrode material and a preparation method thereof. Background technique [0002] The negative electrode material is the key material of the lithium-ion battery, and its performance has an important impact on the cycle performance, rate performance and safety performance of the lithium-ion battery. The currently used negative electrode material is graphite carbon material. Due to its low capacity and small interlayer spacing, the repeated intercalation of lithium ions in the process of high-rate charge and discharge causes the interlayer structure of the carbon material to be destroyed, thereby reducing its rate performance and performance. cycle performance. [0003] In the prior art, CN105720255A discloses a method for preparing a nitrogen-phosphorus co-doped carbon-coated graphite negative electrode material, which includes the follo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/60H01M4/58H01M4/485H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/366H01M4/485H01M4/582H01M4/583H01M4/60H01M10/0525Y02E60/10
Inventor 和百正和明刚田二强
Owner 陕西君和聚源科技有限公司
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