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Lithium-dissimilar metal composite negative electrode material and preparation method thereof

A technology of dissimilar metals and negative electrode materials, applied in battery electrodes, lithium batteries, electrical components, etc., can solve the problems of short life and low Coulombic efficiency, achieve low cost, improve Coulombic efficiency, and inhibit the growth of lithium dendrites.

Inactive Publication Date: 2019-06-18
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] In view of the defects in the background technology, the present invention proposes a lithium-heterogeneous metal composite negative electrode material and its preparation method, which effectively solves the problem of low coulombic efficiency and low coulombic efficiency caused by the growth of lithium dendrites in the lithium metal negative electrode material during the battery cycle process. short lifespan

Method used

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  • Lithium-dissimilar metal composite negative electrode material and preparation method thereof
  • Lithium-dissimilar metal composite negative electrode material and preparation method thereof
  • Lithium-dissimilar metal composite negative electrode material and preparation method thereof

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Embodiment 1

[0039] A preparation method of a lithium-heterogeneous metal composite negative electrode material, specifically comprising the following steps:

[0040] Step 1. Put the metal lithium on the stainless steel foil and place it on the heating table, and then heat the heating table to 200°C to make the metal lithium into a molten state;

[0041] Step 2, adding dissimilar metal calcium (Ca) into the metal lithium in molten state obtained in step 1, keeping it warm for 10 minutes, mixing uniformly, and forming a molten alloy; wherein, the molar ratio of dissimilar metal calcium (Ca) to metal lithium is 1: 50;

[0042] Step 3. Cool the molten alloy obtained in step 2 to room temperature within 1 min to obtain the lithium-calcium alloy CaLi 50 Negative material.

Embodiment 2

[0044] A preparation method of a lithium-heterogeneous metal composite negative electrode material, specifically comprising the following steps:

[0045] Step 1, heating metallic lithium to 300°C to make metallic lithium a molten state;

[0046] Step 2, adding dissimilar metal calcium (Ca) into the metal lithium in molten state obtained in step 1, keeping it warm for 30 minutes, mixing uniformly, and forming a molten alloy; wherein, the molar ratio of dissimilar metal calcium (Ca) to metal lithium is 1: 10;

[0047] Step 3. Cool the molten alloy obtained in step 2 to room temperature within 6 minutes to obtain the lithium-calcium alloy CaLi 10 Negative material.

Embodiment 3

[0049] A preparation method of a lithium-heterogeneous metal composite negative electrode material, specifically comprising the following steps:

[0050] Step 1, heating metallic lithium to 500°C to make metallic lithium a molten state;

[0051] Step 2, adding dissimilar metal calcium (Ca) into the metal lithium in molten state obtained in step 1, keeping it warm for 10 minutes, mixing uniformly, and forming a molten alloy; wherein, the molar ratio of dissimilar metal calcium (Ca) to metal lithium is 1: 5;

[0052] Step 3. Cool the molten alloy obtained in step 2 to room temperature within 8 minutes to obtain lithium-calcium alloy CaLi 5 Negative material.

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Abstract

The invention discloses a lithium-dissimilar metal composite negative electrode material and a preparation method thereof, and belongs to the technical field of battery negative electrode materials. The method includes the following steps of: firstly, heating metal lithium to 200-800DEG C to ensure that the metal lithium is in a molten state; then, adding dissimilar metal to the metal lithium in the molten state, performing heat preservation for 5-60min, and uniformly mixing to form a molten alloy; and finally, cooling the molten alloy to room temperature to obtain the lithium-dissimilar metalcomposite negative electrode material. The material contains a metal lithium elemental phase, and when the material is used as a negative electrode material of a lithium battery, the metal lithium elemental phase acts as a lithium source. The lithium-dissimilar metal composite negative electrode material and the preparation method thereof provided by the invention are simple and feasible and havelow costs, and when the negative electrode material is applied in the lithium battery, the coulombic efficiency and cycle life of the battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrode materials, and in particular relates to a lithium-heterogeneous metal composite negative electrode material and a preparation method thereof. Background technique [0002] People have higher and higher requirements for the battery energy density of electronic equipment, electric vehicles, etc., and metal lithium anodes have high specific capacity (3861mAh / g), the lowest electrochemical potential (-3.04V), and small density ( 0.534g / cm 3 ), and has become the most promising anode material for high-energy lithium batteries. At present, the main problems limiting the application of lithium metal in high-energy batteries are dead lithium and lithium dendrite growth, which will lead to serious problems such as low Coulombic efficiency, short cycle life and poor safety performance. The main reason for the formation of lithium dendrites and dead lithium is that the uneven deposition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 李晶泽王成林贾维尚姚泽宇刘芋池王志红
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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