Lithium battery coated metal lithium negative electrode material and preparation method thereof

A technology of negative electrode material and metal lithium, applied in the field of lithium battery coated metal lithium negative electrode material and preparation field, can solve the problems of short cycle life, low Coulomb efficiency, poor safety performance, etc., so as to improve the transportation capacity and improve the cycle performance. , the effect of good stability

Inactive Publication Date: 2021-07-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects that the metal lithium anode is easily eroded by the electrolyte and lithium dendrites grow, resulting in low coulombic efficiency, short cycle life and poor safety performance, the present invention proposes a lithium battery-coated metal lithium anode material and a preparation method, In this way, the protection of metal lithium is achieved, the tolerance of metal lithium anode materials is improved, the growth of lithium dendrites is inhibited, and the cycle performance and safety are improved.

Method used

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  • Lithium battery coated metal lithium negative electrode material and preparation method thereof
  • Lithium battery coated metal lithium negative electrode material and preparation method thereof
  • Lithium battery coated metal lithium negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] (1) Add lithium shavings to the grinding bowl, then perform wet grinding in an argon-protected glove box, the grinding medium is kerosene, the speed is controlled at 45rpm, grind for 5 hours, remove the oxide film on the surface, and then collect the obtained powder After drying, put it into a vacuum bag and seal it to realize the pretreatment of lithium and obtain lithium powder with a highly active surface;

[0042] (2) Add 85g of lithium powder with high active surface and 35g of amino-functionalized graphene microflakes into the ball mill. Ball milling under the protection of argon for 2.5 hours, the ball milling is dry ball milling, the grinding medium is zirconia microspheres, the average diameter is 0.8mm, the ball-material ratio is controlled at 9:1, the speed is controlled at 40rpm, and then the gas source is replaced with argon / Nitrogen mixed gas, the gas flow ratio of argon and nitrogen is 100:5, continue ball milling for 1.5h to obtain composite particles o...

Embodiment 2

[0044] (1) Add lithium shavings to the grinding bowl, then perform wet grinding in an argon-protected glove box, the grinding medium is liquid paraffin, the speed is controlled at 42rpm, grind for 5.5h, remove the oxide film on the surface, and then collect the obtained After the powder is dried, put it into a vacuum bag and seal it to realize the pretreatment of lithium and obtain lithium powder with a high active surface;

[0045] (2) Add 88g of lithium powder with high active surface and 32g of amino-functionalized graphene microflakes into a ball mill. Ball milling under the protection of argon for 2 hours, the ball milling is dry ball milling, the grinding medium is zirconia microspheres, the average diameter is 0.6mm, the ball-to-material ratio is controlled at 8:1, the speed is controlled at 35rpm, and then the gas source is replaced with argon / Mixed gas of nitrogen, the gas flow ratio of argon and nitrogen is 100:3, continue ball milling for 1h to obtain composite par...

Embodiment 3

[0047] (1) Add lithium shavings to the grinding bowl, then perform wet grinding in an argon-protected glove box, the grinding medium is kerosene, the speed is controlled at 48rpm, grind for 4.5h, remove the oxide film on the surface, and then collect the obtained powder After the body is dried, put it into a vacuum bag and seal it to realize the pretreatment of lithium and obtain lithium powder with a high active surface;

[0048] (2) Add 82g of lithium powder with high active surface and 38g of amino-functionalized graphene microflakes into a ball mill. Ball milling under the protection of argon for 3 hours, the ball milling is dry ball milling, the grinding medium is zirconia microspheres, the average diameter is 0.9mm, the ball-to-material ratio is controlled at 10:1, the speed is controlled at 45rpm, and then the gas source is replaced with argon / The mixed gas of nitrogen, the gas flow ratio of argon and nitrogen is 100:8, continue ball milling for 2h, obtain the composit...

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Abstract

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a lithium battery coated lithium metal negative electrode material and a preparation method thereof. The lithium battery coated lithium metal negative electrode material is prepared by the steps: lithium scraps being subjected to wet grinding under argon protection, performing drying and sealing after grinding, and obtaining lithium powder with a high-activity surface; adding the lithium nitride/metal lithium/amino graphene composite particle and amino-functionalized graphene nanoplatelets into a ball mill, carrying out ball milling under the protection of argon, replacing with argon/nitrogen mixed gas, continuously carrying out ball milling to obtain the lithium nitride/metal lithium/amino graphene composite particle, adding aluminum powder and copper powder, replacing with argon, and carrying out ball milling again to obtain the material. The aluminum-lithium alloy layer coated on the surface of the negative electrode material ensures good stability, the lithium nitride phase coated inside can effectively improve the transport capacity of lithium ions, inhibit lithium dendrite deposition and improve the cycle performance of metal lithium, and meanwhile, the preparation process is simple, the coating effect is good, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to a lithium battery coated metal lithium negative electrode material and a preparation method. Background technique [0002] In recent years, the development and application of lithium batteries have received widespread attention under the environment that the country vigorously advocates the development of new energy and related industries. Lithium battery negative electrode material is the carrier of lithium ions and electrons during the charging process of the battery, and plays the role of energy storage and release. As one of the important raw materials of lithium ion batteries, it has an important impact on the performance of lithium batteries. [0003] Among the anode materials of lithium batteries, the metal lithium anode has a high specific capacity (3860mAh / g), the lowest electrochemical potential (-3.04V), and a small density (0.534g / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/382H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 廖健淞陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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