A kind of surface treatment method of lithium battery hard carbon negative electrode

A technology of surface treatment and treatment method, applied in the field of surface treatment of hard carbon negative electrode of lithium battery, can solve the problems of inability to solve the risk of SEI damage, inability to completely solve the capacity loss and other problems, achieve good cycle stability, improve rate charge and discharge performance, Corrosion inhibitory effect

Active Publication Date: 2020-05-15
东莞市安诺德新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither adding a suitable lithium source to the negative electrode to compensate for the loss of lithium ions during the formation of the SEI film nor preventing the formation of the SEI film can completely solve the capacity loss after the first charge and discharge, nor can it solve the damage of the SEI during use. risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A surface treatment method for a hard carbon negative electrode of a lithium battery, the specific treatment method is as follows:

[0032] (1) Preparation of hard carbon powder

[0033] First, put the sucrose into a ceramic container, put it into a nitrogen atmosphere furnace and heat it. The heating process is to heat it up to 160°C at 0.1°C / min, keep it warm for 6 hours, then heat it up to 210°C at 5°C / min, and keep it warm for 48 hours;

[0034] Put the sucrose that has completed preliminary carbonization into a high-temperature graphitization furnace, the graphitization temperature is 1200°C, and conduct graphitization treatment in the graphitization furnace for 30 minutes, cool naturally, and airflow pulverize to obtain hard carbon powder with a particle size of 10 μm; the graphitization furnace The atmosphere is high-purity argon, and the pressure is 0.2MPa;

[0035] (2) Preparation of SEI by electrophoresis

[0036] Put the hard carbon powder prepared in step ...

Embodiment 2

[0039]A surface treatment method for a hard carbon negative electrode of a lithium battery, the specific treatment method is as follows:

[0040] (1) Preparation of hard carbon powder

[0041] First put the starch into a ceramic container, put it into a nitrogen atmosphere furnace and heat it. The heating process is to heat to 160°C at 2°C / min, keep it warm for 10 hours, then heat it to 220°C at 5°C / min, and keep it warm for 48h;

[0042] The starch that has completed the initial carbonization is put into a high-temperature graphitization furnace, and the graphitization temperature is 1250 ° C. The graphitization treatment is carried out in the graphitization furnace for 60 minutes, cooled naturally, and air-flow crushed to obtain a hard carbon powder with a particle size of 50 μm; the graphitization furnace The atmosphere is high-purity argon, and the pressure is 0.3MPa;

[0043] (2) Preparation of SEI by electrophoresis

[0044] Put the hard carbon powder prepared in step ...

Embodiment 3

[0047] A surface treatment method for a hard carbon negative electrode of a lithium battery, the specific treatment method is as follows:

[0048] (1) Preparation of hard carbon powder

[0049] First, put the sucrose into a ceramic container, put it into a nitrogen atmosphere furnace and heat it. The heating process is to heat to 160°C at 10°C / min, keep it warm for 12 hours, then heat it to 260°C at 20°C / min, and keep it warm for 72h;

[0050] Put the sucrose that has completed preliminary carbonization into a high-temperature graphitization furnace, the graphitization temperature is 1600°C, and conduct graphitization treatment in the graphitization furnace for 120 minutes, cool naturally, and airflow pulverize to obtain a hard carbon powder with a particle size of 10 μm; the graphitization furnace The atmosphere is high-purity argon, and the pressure is 0.6MPa;

[0051] (2) Preparation of SEI by electrophoresis

[0052] Put the hard carbon powder prepared in step (1) into t...

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Abstract

The invention provides a method for treating the surface of a hard carbon negative electrode of a lithium battery. According to the method, organic short chain sugar is graphitized to form hard carbon, electrophoretic liquid is prepared, a hard carbon negative electrode material is treated by an electrophoretic process, one uniform and compact SEI layer is generated on the surface of the hard carbon negative electrode material, boron and nitrogen are doped to inhibit agglomeration of the surface of an SEI-like film, the surface uniformity and compactness are improved, and lithium loss in the first-time circulation is reduced; meanwhile, corrosion to the negative electrode active material by the electrolyte can be inhibited, and internal resistance and interface resistance are reduced. Boron and nitrogen are permeated to replace C and O therein, a large amount of vacancy defects are introduced and embedded barrier of the lithium ions is reduced, so that the migration rate of the lithiumions in the negative electrode material is increased. The SEI layer is not generated yet in the first-time charging and discharging process, capacity loss caused by scarification of a positive electrode material and electrolyte is avoided, the rate charging and discharging performance is improved, the cycling stability is improved and important practical significance in the commercial applicationof the lithium battery is achieved.

Description

technical field [0001] The invention relates to the fields of lithium ion batteries and energy materials, in particular to a surface treatment method for hard carbon negative electrodes of lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, no pollution, no memory effect, and long life. They are widely used in portable electrical devices such as mobile phones, digital cameras, and notebook computers. At the same time, they are used as an alternative energy source for petroleum in electric vehicles. And hybrid vehicles will also be applied on a large scale. Silicon anode has a large lithium storage capacity and is abundant in the earth, making it an ideal anode material for lithium-ion batteries. [0003] During the first charge and discharge process of lithium-ion batteries, lithium ions and solvents (EC / DMC), traces of water, HF, etc. form a passivation film on the surface of graphite, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525C01B32/205
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner 东莞市安诺德新能源技术有限公司
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