Preparation method of negative electrode powder of fast-charging type lithium ion battery and application of negative electrode powder in lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied in the preparation of fast-charging lithium-ion battery negative electrode powder and its application in lithium-ion batteries, can solve the problems of reduced reversible capacity, deterioration of battery performance, and large polarization voltage. Achieve the effects of small distribution gradient of lithium intercalation, good battery cycle life, and high constant current and constant voltage ratio

Active Publication Date: 2021-07-09
吴耀帮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used lithium-ion battery negative electrode materials have the following disadvantages when charging at a rate above 3C: 1. The surface of the negative electrode is easy to cause the precipitation of a lot of metal lithium in a very short cycle, the reversible capacity of the battery decreases, and the service life of the battery is shortened. , the battery safety problem is prominent; 2. The internal polarization of the battery is serious, the polarization voltage is relatively large, the constant current charging time is very short, the battery’s fast charging ability decreases, and the charging time becomes very long; 3. The SEI film on the surface of the material is unstable , resulting in large liquid consumption, increased surface impedance, reduced reversible capacity, serious deterioration of battery performance, reduced battery cycle life, and prominent safety issues
Due to the existence of the above problems, the existing lithium-ion battery negative electrode materials cannot perform fast charging characteristics well, causing other battery performances to continue to deteriorate during use, resulting in many problems in the use of end products

Method used

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  • Preparation method of negative electrode powder of fast-charging type lithium ion battery and application of negative electrode powder in lithium ion battery
  • Preparation method of negative electrode powder of fast-charging type lithium ion battery and application of negative electrode powder in lithium ion battery

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Embodiment 1

[0041] Weigh 5Kg of phenolic resin powder and fill it into a graphite crucible, put it into a box-type furnace and heat it according to the following program in an argon atmosphere: 150°C for 2h, 350°C for 5h, and 700°C for 5h. Use a pulverizer to pulverize to D50=5μm to obtain hard carbon particles; crush 12Kg needle coke raw coke to D50=5μm, fill the reshaped material into a graphite crucible, and heat it in an Acheson graphitization furnace for 2900 Graphite at high temperature above ℃, crush and sieve to obtain graphite particles; put the obtained hard carbon particles and graphite particles into the fusion machine, add 5Kg phenolic resin solution in stages, after fusion treatment for 5 hours, put the materials into the box furnace, Introduce argon gas and heat at 500°C for 5 hours, after cooling and taking out, crush and sieve to prepare carbon particles with porous double-layer structure; add carbon particles with porous double-layer structure and 2.3Kg high-temperature p...

Embodiment 2

[0043] Weigh 4Kg of phenolic resin powder and fill it into a graphite crucible, put it into a box-type furnace and heat it in an argon atmosphere according to the following program: 150°C for 2h, 400°C for 5h, and 800°C for 10h. Use a pulverizer to grind to D50=6μm to obtain hard carbon particles; grind 7.5Kg of needle coke raw coke to D50=5μm, fill the material after shaping into a graphite crucible, and pass through Acheson graphitization furnace Graphitization at a high temperature above 2900°C, crushing and sieving to obtain graphite particles; put the obtained hard carbon particles and graphite particles into the fusion machine, add 4Kg phenolic resin solution in stages, and after fusion treatment for 3 hours, put the materials into the box furnace , put in argon gas and heat at 700°C for 4 hours, after cooling and taking out, crush and sieve to prepare carbon particles with porous double-layer structure; add carbon particles with porous double-layer structure and 1.8Kg hi...

Embodiment 3

[0045] Weigh 6Kg of phenolic resin powder and fill it into a graphite crucible, put it into a box-type furnace and heat it in an argon atmosphere according to the following program: 150°C for 2h, 750°C for 5h, and 1200°C for 10h. Use a pulverizer to pulverize to D50=4μm to obtain hard carbon particles; crush 15Kg needle coke raw coke to D50=6μm, fill the reshaped material into a graphite crucible, and heat it in an Acheson graphitization furnace for 2900 Graphite at high temperature above ℃, crush and sieve to obtain graphite particles; put the obtained hard carbon particles and graphite particles into the fusion machine, add 6Kg phenolic resin solution in stages, and after fusion treatment for 4 hours, put the materials into the box furnace. Pass in argon gas and heat at 600°C for 7 hours. After cooling and taking out, crush and sieve to prepare carbon particles with a porous double-layer structure; add the carbon particles with a porous double-layer structure and 3Kg of high-...

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Abstract

The invention discloses a preparation method of negative electrode powder of a fast-charging type lithium ion battery and application of the negative electrode powder in a lithium ion battery. The method comprises the following steps: step 1, preparing amorphous carbon particles; step 2, preparing graphite particles; step 3, preparing carbon particles with a porous double-layer structure; and step 4, preparing the negative electrode powder of the fast-charging type lithium ion battery. The negative electrode powder of the fast-charging type lithium ion battery prepared by the method has a multi-layer nested structure in the form of soft carbon-graphite-hard carbon or hard carbon-graphite-soft carbon and the like, has good compatibility with an electrolyte, multiple lithium intercalation channels and a high lithium ion intercalation speed; and the fast-charging type lithium ion battery prepared from the negative electrode powder can realize 3-8 C fast charging capacity, has constant-current charging capacity of greater than or equal to 70%, 3C charge-discharge cycle life of greater than or equal to 1500 times and 8C charge/1C discharge cycle life of greater than or equal to 500 times, and the can meet the quick charging requirement of a digital lithium ion battery and the requirement of a new energy vehicle on the quick charging capacity of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of fast-charging lithium-ion battery negative electrode powder and its application in lithium-ion batteries. Background technique [0002] At present, lithium-ion secondary batteries are widely used in 3C electronics, energy storage, new energy vehicles and other industries, bringing great convenience to people's daily life. With excellent electrochemical properties such as high energy density, high voltage, and low self-discharge, lithium-ion secondary batteries occupy most of the market share of Internet mobile terminal products and new energy vehicle markets, such as smart phones and new energy vehicles. At the same time, after the 5G terminal products are launched, they will be faster, more functional, and more intelligent, resulting in greater power consumption and shorter use time. It is hoped that the charging time of lithium-ion batteries will be faster to improve the experience of terminal products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525H01M10/0587C01B32/05C01B32/205
CPCH01M4/587H01M10/0525H01M10/0587C01B32/05C01B32/205H01M2004/021H01M2004/027Y02P70/50Y02E60/10
Inventor 吴耀帮
Owner 吴耀帮
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