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Negative active material of high-capacity lithium ion battery, negative electrode plate and lithium ion battery

A negative electrode active material, lithium-ion battery technology, applied in the direction of battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of low initial charge and discharge efficiency, battery capacity loss, etc., to improve the initial charge and discharge efficiency and cycle performance Effect

Pending Publication Date: 2021-12-07
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of silicon oxide can effectively reduce the expansion problem of the negative electrode, and the cycle performance is improved. However, another problem brought about by silicon oxide is that the initial charge and discharge efficiency is too low, only about 75%, or even lower, which will lead to a negative electrode active material. Nearly 25% of the lithium ions in the battery are consumed, resulting in a loss of battery capacity

Method used

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  • Negative active material of high-capacity lithium ion battery, negative electrode plate and lithium ion battery
  • Negative active material of high-capacity lithium ion battery, negative electrode plate and lithium ion battery
  • Negative active material of high-capacity lithium ion battery, negative electrode plate and lithium ion battery

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Embodiment 1

[0022] MgSi uses Mg 2 Si and pure SiO are compounded (the molar ratio of the two is 1:1), and the purity of SiO is 99.99%.

[0023] After loading the material into the melting crucible, the vacuum equipment starts vacuuming, and the induction melting system and the heat preservation system power supply are started simultaneously for preheating. After the vacuum degree is pumped below 1Pa, the vacuum chamber of the equipment is filled with argon, and then the second Vacuumize, and when the vacuum degree reaches below 1Pa, stop the vacuum system, fill the argon to the atmospheric pressure, and then increase the power to melt.

[0024] The smelting temperature is 1300-1400°C, argon is used for atomization, and the atomization pressure is about 2.8MPa. Keep warm for more than 30 minutes.

[0025] After the powder is atomized by argon gas and cooled in the wall-cooled vacuum chamber for more than two hours, the powder accumulation bucket is opened, and the atomized powder is tran...

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Abstract

The invention relates to a negative electrode active material of a high-capacity lithium ion battery, a negative electrode plate and a lithium ion battery. The negative electrode active material contains one or a combination of more of a silicon simple substance or a silicon compound, a silicon oxide contains a magnesium element, and the magnesium content accounts for 5-40% of the total weight of the material. By adopting the negative electrode material with high specific capacity, the first charge-discharge efficiency of silicon monoxide can be obviously improved, and meanwhile, the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a high-capacity lithium-ion battery negative electrode material, a negative electrode sheet and a lithium-ion battery. Background technique [0002] Among metal-ion batteries, lithium-based rechargeable batteries are considered to be the most promising battery systems to achieve high-quality / volume energy density and power density due to lithium (Li) having the lowest reduction potential and smallest ionic radius. After nearly two decades of research, lithium-ion rechargeable batteries have been widely used in daily life, including power tools, notebook computers, digital products, mobile phones, electric vehicles, drones, etc. In recent years, the dramatic growth of the market has required commercial lithium-ion batteries to be lighter, thinner, and cheaper. However, currently commercial LIBs have reached their theoretical limits (~250 wh / kg and ~680 wh / L). Because of ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/48H01M4/386H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 王晕赵东元杨东江文锋郭佳
Owner FUDAN UNIV
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