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Coating agent, fast-charging graphite, preparation method and application of fast-charging graphite and battery

A coating agent and graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor stability and fast charging performance of fast-charging graphite, and the feasibility of the preparation method and the cost cannot be taken into account, and achieve excellent The effect of fast insertion, excellent release ability and high capacity

Active Publication Date: 2021-05-14
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the disadvantages of poor fast-charging graphite stability and fast-charging performance in the prior art, the feasibility of the preparation method and the inability to take into account the cost, the present invention provides a coating agent, fast-charging graphite and its preparation method and application ,Battery

Method used

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  • Coating agent, fast-charging graphite, preparation method and application of fast-charging graphite and battery
  • Coating agent, fast-charging graphite, preparation method and application of fast-charging graphite and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1. Preparation of amphiphilic carbon materials

[0071] Using petroleum coke crushed to less than 10 μm as raw material, the amphiphilic carbon material was prepared by the mixed acid method. The specific process was as follows: firstly, 500 mL of mixed acid of concentrated nitric acid and concentrated sulfuric acid was prepared according to the volume ratio of 3:7, and then 100 g of petroleum coke was added. Stir and reflux at ℃ for 3 hours, filter to obtain a filter cake after cooling, and wash the filter cake until neutral to obtain a petroleum coke-based amphiphilic carbon material. According to GB / T 268-1987, the carbon residue value of the petroleum coke-based amphiphilic carbon material is 61%.

[0072] 2. Preparation of coating agent

[0073] Dissolve ethylenediamine in water to obtain an alkaline solution with a pH value of 13 (tested by pH test paper), then dissolve the prepared petroleum coke-based amphiphilic carbon material in the alkaline solution, and fi...

Embodiment 2

[0081] Except that in the step S1 of the preparation of fast-charging graphite, the coating agent (calculated according to the carbon residue value): natural graphite = 5:100 is used for batching, the other conditions and steps are the same as in Example 1.

Embodiment 3

[0083] Except that artificial graphite is used in step S1 of the preparation of fast-charging graphite, other conditions and steps are the same as in Example 1.

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Abstract

The invention discloses a coating agent, fast-charging graphite, a preparation method and application of the fast-charging graphite, and a battery. The coating agent comprises an amphiphilic carbon material, a pH regulator and water, the mass percent of the amphiphilic carbon material in the coating agent is 20%-70%; the pH value of the coating agent is 12 or more. Graphite is coated and modified by adopting the coating agent, a coating layer with uniform thickness and good compactness can be formed, the obtained fast-charging graphite has excellent structural stability and fast-charging performance and can be used as a negative electrode material of batteries such as a lithium ion battery and a solid-state battery, and the preparation method is simple, feasible and low in cost.

Description

technical field [0001] The invention relates to a coating agent, fast-charging graphite, a preparation method and application thereof, and a battery. Background technique [0002] Lithium-ion batteries have high energy density, high working voltage, long cycle life, no pollution, good safety performance, environmental protection and durability, etc. It has a wide range of applications from the environment to low temperature, high temperature, and fast charging, and continues to deepen and expand. Lithium-ion battery technology is also one of the research hotspots that have attracted wide attention in recent years, and has had a profound impact on people's production and lifestyle. [0003] Anode materials are one of the key technologies that restrict the continuous improvement of lithium-ion batteries, and are also one of the main breakthroughs to improve the performance of lithium-ion batteries. Commercial lithium-ion battery anode materials are mainly various carbon mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 潘福森沈龙曾繁俊范拯华王晓阳陈兵帅张秀云
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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