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Lithium supplement material and manufacturing method thereof, negative pole piece and battery

A technology for lithium-ion batteries and lithium supplementation, which is applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as potential safety hazards, and achieve the effects of increasing porosity, low cost, and simple preparation process

Pending Publication Date: 2022-03-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the electrochemical lithium supplementation method, it is easy to cause the negative electrode transition lithium intercalation, resulting in the formation of lithium dendrites on the surface of the electrode, which brings a greater safety hazard.

Method used

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  • Lithium supplement material and manufacturing method thereof, negative pole piece and battery
  • Lithium supplement material and manufacturing method thereof, negative pole piece and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 10g of lithium powder (particle size 200-500nm) into 100ml of molten vinyl sulfate under nitrogen atmosphere (mass ratio of lithium powder to vinyl sulfate is 1:10), stir for 2 hours, and then pour into a 10-micron In the liquid nitrogen of the aperture screen, cool for 2 hours to obtain the lithium-replenishing material M1. Add lithium-supplementing material M1 to the negative electrode slurry to obtain battery A, wherein the lithium-supplementing material M1 accounts for the total active materials of the negative electrode (natural graphite, artificial graphite, soft carbon, hard carbon, mesocarbon microspheres, nanocarbon, carbon fiber, The mass ratio of one or more of silicon-based materials, tin-based materials and lithium titanate) is 1%. figure 1 An electron micrograph of the lithium-supplementing material M1 of Example 1 is shown. In the embodiment of the present invention, the lithium-supplementing material is stable in the air because of the coating of or...

Embodiment 2

[0050] The lithium-replenishing material was prepared by the same steps as in Example 1, except that the organic matter was methylene methanedisulfonate, and the lithium-replenishing material M2 was obtained. The lithium supplement material M2 is added to the negative electrode slurry to obtain the battery B.

Embodiment 3

[0052] The lithium-replenishing material was prepared by the same steps as in Example 1, except that the organic matter was propenyl-1,3 sultone, and the lithium-replenishing material M3 was obtained. A battery C is obtained by adding the lithium-supplementing material M3 into the negative electrode slurry.

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Abstract

The invention discloses a lithium supplementing material and a manufacturing method thereof, a negative pole piece and a battery, the lithium supplementing material is a composite material with a core-shell structure, the composite material comprises metal lithium particles and an organic matter wrapping the metal lithium particles, the organic matter is in a solid state at the temperature below 80 DEG C, the molecular weight of the organic matter is 50-400, and the molecular weight of the organic matter is 50-400. And when the lithium supplementing material is applied to the lithium ion battery, the organic matter can be dissolved in an electrolyte of the ion battery. According to the embodiment of the invention, the active lithium is coated with the organic matter, so that the active lithium stably exists in the preparation process of the pole piece and is slowly released in the cycle process of adding the electrolyte and the battery, and when the organic coating is slowly dissolved in the electrolyte, the lithium powder participates in the lithium intercalation process of the negative electrode; and pores are left at the position of the original lithium powder coating, so that the lithium supplementing material not only can provide a lithium source for a negative electrode, but also can improve the porosity, and is beneficial to the development of subsequent multiplying power and cycle performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium supplement material and a manufacturing method thereof, a negative pole piece, and a battery. Background technique [0002] Due to the advantages of high energy power density, excellent cycle stability, high operating voltage, good safety, and environmental friendliness, lithium-ion batteries are widely used in various mobile electronic devices, and have gradually become an important part of electric vehicles (EV) and hybrid electric vehicles. Main power supply for automobiles (HEV). The performance of positive and negative electrode materials, electrolyte and separator affects and restricts the improvement of lithium-ion battery performance, in which the negative electrode material plays a key role. However, the high specific capacity negative electrode material of lithium-ion batteries forms a solid electrolyte film (SEI film) during the first charge and overcharge...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/04H01M4/134H01M10/0525H01M10/058H01M10/42
CPCH01M4/382H01M4/62H01M10/4235H01M4/04H01M4/134H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 肖晶刘秦田志明姜熙潘仪
Owner BYD CO LTD
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