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Lithium ion battery negative electrode active material, lithium ion battery negative electrode, lithium ion battery, battery pack and battery power vehicle

A lithium-ion battery, negative electrode technology, applied in battery electrodes, batteries, secondary batteries, etc., can solve problems such as reduced discharge capacity

Active Publication Date: 2019-04-02
HUNAN JINYE HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the negative electrode materials used in lithium-ion batteries are mainly to improve the sphericity and regularity of graphite particles. Although the carbon materials prepared by these methods can increase the capacity of lithium-ion batteries at the initial stage of charging and discharging, after increasing the rate, their discharge capacity will be reduced accordingly

Method used

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  • Lithium ion battery negative electrode active material, lithium ion battery negative electrode, lithium ion battery, battery pack and battery power vehicle
  • Lithium ion battery negative electrode active material, lithium ion battery negative electrode, lithium ion battery, battery pack and battery power vehicle
  • Lithium ion battery negative electrode active material, lithium ion battery negative electrode, lithium ion battery, battery pack and battery power vehicle

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Embodiment 1

[0075] 1. Preparation of lithium-ion battery negative electrode carbon particles:

[0076] In the present invention, casting coke is selected as the carbon source (SCO), and the casting coke is dried until the water content is lower than 1% by weight. The carbon source was crushed until the D50 was 10-18 μm, and the carbon source was purified with 30 volume % HF. The carbon source and the HF solution were mixed uniformly at a volume ratio of 1:1.2, and stirred for 30 minutes to form a mixture. After the mixture is separated, the solid is rinsed with deionized water, and after separation, the separated solid is dried for use.

[0077] The dried solid is subjected to carbonization treatment, and the whole carbonization treatment process includes three heating stages. The first heating stage is: heating from room temperature to 500°C at a heating rate of 3°C / min, and keeping the temperature at 500°C for 30 minutes; the second heating stage is: heating to 1000°C at a heating rate...

Embodiment 2

[0089] According to the method of embodiment 1, its difference is:

[0090] When preparing lithium-ion battery negative electrode carbon particles, the dried solids are subjected to carbonization treatment, and the entire carbonization treatment process includes six heating stages. The first heating stage is: heating from room temperature to 200°C at a heating rate of 4°C / min, and keeping the temperature constant for 30 minutes; the second heating stage is: heating to 500°C at a heating rate of 5°C / min, and keeping the temperature constant for 30 minutes; The third heating stage is: heating to 800°C at a heating rate of 5°C / min, and keeping the temperature constant for 20 minutes; the fourth heating stage is: heating to 1000°C at a heating rate of 4°C / min, and keeping the temperature constant for 20 minutes; the fifth heating stage is: The temperature was raised to 1200°C at a heating rate of 4°C / min, and the temperature was kept constant for 20 minutes; the sixth heating stag...

Embodiment 3

[0094] According to the method of embodiment 1, its difference is:

[0095] The dried solid is subjected to carbonization treatment, and the whole carbonization treatment process includes three heating stages. The first heating stage is: heating from room temperature to 500°C at a heating rate of 3°C / min, and keeping the temperature at 500°C for 20 minutes; the second heating stage is: continuing to heat at a heating rate of 3°C / min to 1000°C , and keep the temperature at 1000°C for 30min; the third heating stage is: continue heating to 1500°C at a heating rate of 3°C / min, and keep the temperature at 1500°C for 30min.

[0096] The carbonized solid is subjected to graphitization treatment, and the entire graphitization treatment process includes three heating stages. The first heating stage is: heating to 1350°C at a heating rate of r1=3°C / min, and keeping the temperature at 1350°C for 30 minutes; the second heating stage is: heating to 1980 at a heating rate of r2=2.8°C / min ...

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Abstract

The invention relates to the field of lithium ion battery negative electrode carbon materials, particularly to a lithium ion battery negative electrode active material, a lithium ion battery negativeelectrode, a lithium ion battery, a battery pack and a battery power vehicle. According to the present invention, in the pore structure, measured through N2 adsorption and desorption, of the lithium ion battery negative electrode carbon particles, by using the total pore volume measured by BJH having a pore size of 2-200 nm as the reference, the sum of the volumes of pores with a pore size of 2-10nm is 5-10%, the volumes of pores with a pore size of 10-100 nm account for 50-65%, the volumes of pores with a pore size of 100-200 nm account for 30-40%, and the carbon particles have a BET specific surface area of 1-4 m<2> / g, preferably 1.4-1.9 m<2> / g. According to the present invention, the button cell made of the carbon particles has a charging capacity of 392-403.65 mAh / g and a discharge capacity of 360-373 mAh / g, and the discharge capacity at 5C rate is maintained at 1985.7-2029.8 mAh after the button cell is assembled into the columnar battery.

Description

technical field [0001] The invention relates to the field of negative electrode carbon materials for lithium ion batteries, in particular to a lithium ion battery negative electrode active material, a lithium ion battery negative electrode, a lithium ion battery, a battery pack and a battery powered vehicle. Background technique [0002] Lithium-ion batteries have the advantages of high theoretical specific capacity, long cycle life and high safety, and have become a hot spot in new energy research in recent years. During the charging and discharging process of lithium-ion battery, Li + Intercalation and deintercalation back and forth between positive and negative electrodes. Therefore, the selection of anode materials plays a crucial role in the capacity of Li-ion batteries. At present, carbon materials, silicon materials, and metal or alloy materials are mainly selected as negative electrode materials for lithium ions. Carbon materials are easy to obtain raw materials, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15H01M4/587H01M4/133H01M10/0525H01M10/058B82Y30/00
CPCB82Y30/00C01B32/15H01M4/133H01M4/587H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 劭建荣孙强王宏栋张俊祥张留峰唐杰
Owner HUNAN JINYE HIGH TECH CO LTD
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