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Carbon-coated lithium supplementing material as well as preparation method and application thereof

A carbon coating and carbon coating layer technology is applied in the field of carbon coating lithium-replenishing materials and their preparation, which can solve the problems of affecting battery life, high decomposition potential of lithium-containing compounds, generation of oxygen and other by-products, etc. The effect of irreversible lithium loss, improving battery energy density, and reducing decomposition potential

Active Publication Date: 2020-10-27
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Publication No. "CN104037418A", an invention patent application titled "A Lithium-ion Battery Positive Electrode Film and Its Preparation and Application", discloses a lithium-supplementing material based on a lithium-oxygen compound, a lithium source, and an alkyllithium. Lithium-supplementing materials can be added to the positive stage to achieve lithium-supplementing effect, but the decomposition potential of lithium-containing compounds is high, and oxygen and other by-products are generated during the decomposition process, which affects battery life

Method used

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  • Carbon-coated lithium supplementing material as well as preparation method and application thereof
  • Carbon-coated lithium supplementing material as well as preparation method and application thereof
  • Carbon-coated lithium supplementing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] the SiO 2 and Li 2 CO 3 Mix and grind at a stoichiometric ratio of 1:2, and sinter at 800 °C to obtain Li 4 SiO 4 , as a lithium-containing compound, and then combined with the reducing agent CaB 6 Mixed at a weight ratio of 10:1, sintered at 800°C in a tube furnace, and fed with methane gas to prepare a carbon-coated lithium-replenishing material with a morphology as follows figure 1 shown in the scanning electron microscope photo.

[0028] During the LFP electrode slurry mixing process, the above-mentioned carbon-coated lithium-replenishing material was added to make a positive electrode sheet, which was then assembled with a graphite negative electrode sheet to form a full battery for testing. The charging curve in the first week is as follows: figure 2 As shown in the figure, when charged to 4.5V, the lithium replenisher releases active lithium ions and exerts the lithium replenishment capacity. Different amounts of carbon-coated lithium-replenishing material...

Embodiment 2

[0032] Combining Lithium Oxide Powder with CaB 6 Mixing and grinding at a weight ratio of 10:1, then sintering at 800°C in a tube furnace, and feeding methane gas to prepare a carbon-coated lithium-replenishing material. During the LFP electrode slurry mixing process, 2wt.% of the above carbon-coated lithium-replenishing material was added to make a positive electrode sheet, which was then assembled with a graphite negative electrode sheet to form a full battery. The experimental test showed that the carbon-coated lithium-replenishing material during the first week of charging was It can actually supplement the active lithium for the battery.

Embodiment 3

[0034] Combining Lithium Oxide Powder with CaB 6 Mixed and ground at a weight ratio of 10:1, then sintered at 800°C in a tube furnace, and fed with methane gas to prepare a carbon-coated lithium supplement. In the process of NCM ternary electrode slurry mixing, 2wt.% of the above carbon-coated lithium-replenishing material was added to make a positive electrode sheet, which was then assembled with a graphite negative electrode sheet to form a full battery. The experimental test showed that the carbon-coated supplementary material during the first week of charging was Lithium materials can actually supplement active lithium for batteries.

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Abstract

The invention discloses a carbon-coated lithium supplementing material as well as a preparation method and application thereof. The carbon-coated lithium supplementing material comprises a lithium-containing compound, an inorganic nonmetal reducing agent and a carbon-containing coating layer partially or completely coating the surface of the lithium-containing compound or / and the inorganic nonmetal reducing agent. According to the carbon-coated lithium supplementing material provided by the invention, agglomeration and growth of the lithium supplementing agent in the synthesis process can be inhibited through carbon coating, the air stability and conductivity of the lithium supplementing agent are improved, the lithium supplementing agent is catalyzed to be decomposed at a relatively low potential to release lithium ions, the lithium supplementing capacity is increased, and the effect of improving the energy density of the battery is achieved; and the carbon-coated lithium supplementing material is simple in preparation process and is beneficial to wide popularization and application. When the carbon-coated lithium supplementing material provided by the invention is added into thepositive electrode of a lithium secondary battery, the irreversible lithium loss of the first charge-discharge negative electrode can be compensated, and the energy density of the battery is improved.The activity of the lithium supplementing material can be improved through surface carbon coating, the air stability is improved, and large-scale application of the lithium supplementing agent in a lithium ion energy storage device is realized.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a carbon-coated lithium-replenishing material capable of improving the energy density of a lithium-ion battery, and a preparation method and application thereof. Background technique [0002] Lithium-ion energy storage devices, especially lithium secondary batteries, will form a solid electrolyte interface (SEI) on the surface of the negative electrode during the first cycle, resulting in irreversible lithium loss, resulting in a decrease in the energy density of lithium-ion batteries. The new high-capacity alloy anode material has a low coulombic efficiency (<90%) for the first time, resulting in a large capacity loss in the first week of the battery, and lithium supplementation is required to achieve large-scale application. [0003] Publication No. "CN1290209C", an invention patent entitled "Dispersion of Lithium Metal in the Negative Electrode of Secondary Batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 闫勇黄学杰詹元杰武怿达马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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