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Lithium battery negative electrode material and preparation method

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of lithium dendrites, restricting development and application, dead lithium, etc., to achieve increased surface area, less consumption of lithium ions, The effect of increasing the surface area

Active Publication Date: 2020-04-17
HUNAN JINYE HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of metal lithium as the negative electrode material in the early lithium-ion batteries, there were phenomena such as "lithium dendrites" and "dead lithium", which seriously restricted its development and application.

Method used

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  • Lithium battery negative electrode material and preparation method
  • Lithium battery negative electrode material and preparation method
  • Lithium battery negative electrode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A lithium battery negative electrode material, the preparation method following steps:

[0052] Physical treatment: take coal-based coke powder and dry until the water content is less than 1%, crush to 6-18μm, after grading, shaping and spheroidizing,

[0053] Chemical treatment: Add the spheroidized coal-based coke powder to a mixed acid composed of 15% hydrochloric acid and 19% hydrofluoric acid by mass percentage, filter, rinse, and filter again, then dry.

[0054] Graphitization: Under the protection of high-purity nitrogen, the coal-based coke powder after chemical treatment and drying is heated by the following multi-stage heating method to obtain the negative electrode material;

[0055] The carbonized product goes through at least two heating stages from 0-10°C to reach 2900-3000°C. Each heating stage includes two successive sub-heating stages. stage heating rate.

[0056] Further scheme, the heating up process of the multi-stage heating up of described graphi...

Embodiment 2

[0069] This embodiment is a specific implementation of Embodiment 1, the preparation method of lithium battery negative electrode material, comprising the following steps:

[0070] Physical treatment: take coal-based coke powder and dry until the water content is less than 1%, crush to 6-18μm, after grading, shaping and spheroidizing,

[0071] Chemical treatment: Add the spheroidized coal-based coke powder to a mixed acid composed of 15% hydrochloric acid and 19% hydrofluoric acid by mass percentage, filter, rinse, and filter again, then dry.

[0072] Graphitization: Under the protection of high-purity nitrogen, the coal-based coke powder after chemical treatment and drying is heated by the following multi-stage heating method:

[0073] The first heating stage: the product after chemical treatment is raised from 0-10°C to 780-800°C at the first heating rate V1, and then to 1150-1200°C at the second heating rate V2, V1>V2,

[0074] The second heating stage: from 1150-1200°C to...

Embodiment 3

[0085] The difference between the present embodiment and the second embodiment is that the multi-stage heating method adopted in the graphitization in the present embodiment is as follows:

[0086] The first heating stage: the carbonized product is raised from 0-10°C to 400-450°C at the first heating rate V1, and then to 900-920°C at the second heating rate V2, V1>V2,

[0087] The second heating stage: from 900-920°C to 1300-1350°C at the third heating rate V3, and then to 1700-1800°C at the fourth heating rate V4, V3>V4,

[0088] The third heating stage: from 1700-1800°C to 2200-2300°C at the fifth heating rate V5, and then to 2900-3000°C at the sixth heating rate V6, V5>V6;

[0089] Finally, the negative electrode material is obtained after 0.5-1.0 hours of heat preservation.

[0090] The first heating rate V1 is 60-62°C / hour, the second heating rate V2 is 40-41°C / hour, the third heating rate V3 is 85-87°C / hour, and the fourth heating rate V4 is 20-22°C / hour hour, the fift...

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Abstract

The invention belongs to the field of batteries, and particularly relates to a lithium battery negative electrode material and a preparation method. The negative electrode material is prepared by graphitizing coal-based coke powder, and seen from the electron micrograph of the negative electrode material, the negative electrode material is of a layered crystal structure with pores, and the pore walls of the pores are provided with micropores. The negative electrode material has the beneficial effects that the coal-based coke powder is used as a raw material, the negative electrode material with holes is prepared through a graphitization process, micropores are formed in the hole walls of the holes, and the negative electrode material is large in first-time specific discharge capacity, small in first-time irreversible capacity and good in current charge and discharge performance and cycle performance.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a lithium battery negative electrode material and a preparation method. Background technique [0002] Lithium-ion battery refers to a secondary battery system that uses two different lithium intercalation compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes of the battery, respectively. When charging, lithium ions are deintercalated from the positive electrode, passed through the electrolyte and separator, and inserted into the negative electrode; on the contrary, lithium ions are deintercalated from the negative electrode, passed through the electrolyte and separator, and inserted into the positive electrode. [0003] The negative electrode of the lithium-ion battery is formed by mixing the negative electrode active material, binder and additives to form a paste-like adhesive that is evenly spread on both sides of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525H01M4/02
CPCH01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 王宏栋邵建荣孙强
Owner HUNAN JINYE HIGH TECH CO LTD
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