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Composite anode materials for lithium-ion batteries

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. Current charge and discharge capacity and other issues, to achieve the effect of suppressing volume effect, improving charge and discharge performance and service life

Active Publication Date: 2020-12-11
钟旭航
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure silicon will undergo a huge volume change (volume expansion rate of 300%) during the charging and discharging process, resulting in its pulverization, which will affect the safety of the battery; on the other hand, pure silicon has low electronic conductivity and is difficult to Improve the high-current charge and discharge capability of lithium-ion batteries

Method used

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  • Composite anode materials for lithium-ion batteries
  • Composite anode materials for lithium-ion batteries

Examples

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preparation example Construction

[0017] The preparation method of the composite negative electrode material for the above-mentioned lithium ion battery is:

[0018] (1) Clean the silicon substrate, and deposit a layer of tin oxide and nickel metal on the silicon substrate with a tin target and a nickel target respectively;

[0019] (2) Using methane as an auxiliary gas, the mixture of diamond powder and aluminum powder is sprayed onto the surface of the silicon substrate in step (1) by means of supersonic flame spraying to obtain a negative electrode material for lithium-ion batteries.

[0020] In the present invention, described tin oxide is also a kind of high specific capacity (theoretical charge-discharge capacity is up to 790mAh / g), low intercalation lithium potential, good safety performance novel lithium battery anode material, but the first irreversible capacity of tin oxide is relatively low large, the electrochemical performance declines rapidly, and the cycle stability is very poor, which limits it...

Embodiment 1

[0033] A preparation method of lithium ion battery negative electrode material:

[0034] (1) Cleaning the silicon substrate. After the silicon substrate is cleaned, the silicon substrate is placed in a deposition chamber. In the presence of an inert gas, the bias power is turned on, and the silicon substrate is sputtered and cleaned with a plasma of an inert gas;

[0035] The process parameters of the sputtering cleaning are: power supply 30kW; deposition chamber pressure is 2Pa, negative bias voltage applied to the substrate is -600V, the duty cycle of the bias voltage is 50%, and the sputtering cleaning time is 10min;

[0036] Using Youwei IN-LINE continuous sputtering machine as the sputtering equipment, deposit a layer of tin oxide and nickel metal on the silicon substrate in sequence;

[0037] Specifically, in No. 1 deposition chamber, argon is used as the sputtering gas, the feed rate of argon gas is 120ml / min, the reactive gas that feeds in is oxygen, and the feed rate ...

Embodiment 2

[0044] The preparation method of this embodiment is the same as that of the lithium-ion battery negative electrode material in Example 1, the difference is that the stroke motor frequency of the continuous sputtering machine is controlled so that the deposition thickness of tin oxide is 1 μm, and the deposition thickness of nickel metal is 0.5 μm .

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Abstract

The invention belongs to the technical field of lithium-ion battery materials, and particularly relates to a compound cathode material used for a lithium-ion battery. The cathode material takes a silicon wafer as a substrate; one side of the silicon wafer is provided with a stannic oxide deposition layer, the stannic oxide deposition layer is provided with an electric conduction layer compounded by a carbon nanotube and metal nickel, and the electric conduction layer is provided with a hardening layer; the hardening layer takes fused metallic aluminum as adhesive; diamond powder is adhered tothe electric conduction layer. According to the compound cathode material, the stannic oxide deposition layer is deposited on the surface of a silicon substrate, the electric conduction layer and thehardening layer are arranged in sequence so as to solve the problem of low electronic conductivity of the silicon substrate and the stannic oxide, and the volume effect of the silicon substrate and the stannic oxide deposition layer in a lithium intercalation and removing process can be inhibited so as to so as to effectively improve the charging and discharging performance of the lithium-ion battery and prolong the service life of the lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a composite negative electrode material for lithium ion batteries. Background technique [0002] With the rapid development of the economy, human beings are facing the severe challenges of energy crisis and environmental pollution. All countries in the world are constantly seeking for cleaner and more environmentally friendly green energy. Among them, lithium-ion batteries are widely used in the field of power batteries due to their advantages such as high energy density, high voltage, long cycle life, low self-discharge rate, no memory effect, stable discharge voltage, fast charge and discharge, and environmental protection. There are relatively many studies on positive electrode materials for lithium-ion batteries, and they have reached a high level in terms of material selection and modification. With the development of positive electrode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/483H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 钟旭航丘焕山
Owner 钟旭航