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Electrode material for reducing volume change of electrode in charging and discharging process and battery

An electrode material and battery technology, applied in the direction of non-aqueous electrolyte batteries, battery electrodes, lithium batteries, etc., can solve the problems of energy density reduction and battery energy density reduction, improve electrical performance, prevent electrode materials from falling off, and simple operation process Effect

Active Publication Date: 2022-03-22
高能时代(珠海)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the work introduces inactive substances for coating treatment in the method of slowing down the volume change of battery electrode materials. These strategies reduce the energy density of the battery in practical applications, especially after repeated charge and discharge.

Method used

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  • Electrode material for reducing volume change of electrode in charging and discharging process and battery
  • Electrode material for reducing volume change of electrode in charging and discharging process and battery
  • Electrode material for reducing volume change of electrode in charging and discharging process and battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the preparation of electrode material, battery

[0047] A kind of electrode material that reduces the volume change of battery electrode in charge and discharge process, comprises active material, and active material comprises charge product and discharge product; charge product and discharge product are sulfur (S) and lithium sulfide (Li 2 S), sulfur (S) and lithium sulfide (Li 2 The molar ratio of S) is 1:1;

[0048] Electrode materials also include electrolytes (sulfide electrolyte Li 6 P.S. 5 Cl) and conducting agent (acetylene black), the quality of electrolyte is 10% of the mass of active material; The quality of conducting agent is 10% of the mass of active material.

[0049] The preparation method of the above-mentioned electrode material for reducing the volume change of the battery electrode during charging and discharging comprises the following steps:

[0050] (1) The dried S and Li 2 S, mix according to the molar ratio of 1:1, add 100 zir...

Embodiment 2

[0055] Embodiment 2: the preparation of electrode material, battery

[0056] Compared with Example 1, the molar ratio of sulfur and lithium sulfide in Example 2 was adjusted to 2:1, and the rest of the components and preparation process were the same as in Example 1.

Embodiment 3

[0057] Embodiment 3: the preparation of electrode material, battery

[0058] Compared with Example 1, the molar ratio of sulfur and lithium sulfide in Example 3 was adjusted to 1:2, and the rest of the components and preparation process were the same as in Example 1.

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Abstract

The invention belongs to the technical field of batteries, and discloses an electrode material for reducing volume change of an electrode in charging and discharging processes and a battery. The electrode material comprises an active substance, and the active substance comprises a charging product and a discharging product. The charging product and the discharging product are selected from at least one of sulfur and lithium sulfide, sulfur and sodium sulfide, sulfur and potassium sulfide, sulfur and magnesium sulfide, sulfur and aluminum sulfide, sulfur and zinc sulfide, sulfur and silver sulfide, sulfur and lead sulfide, sulfur and molybdenum sulfide, sulfur and iron sulfide, silicon and lithium silicon alloy, and silicon monoxide and lithium silicon alloy. When the active substance is used as an initial-state active substance of a battery electrode material, the volume change of a battery electrode in the charging and discharging process can be remarkably reduced, so that the problems that the electrode material falls off in the charging and discharging cycle process of a battery, the performance of the battery is seriously degraded and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrode material and a battery that reduce the volume change of electrodes during charging and discharging. Background technique [0002] Lithium batteries have the advantages of high energy density and no memory effect. However, during the charging and discharging process of the lithium battery, due to the different densities of the charging product and the discharging product, different degrees of volume change are caused. Among them, the volume change of the lithium-sulfur battery positive electrode sulfur is as high as 80% during the cycle, and the volume change of the silicon negative electrode is as high as 300%. This large volume change causes the structure of the positive electrode to be destroyed, the active material is separated from the conductive agent, and the battery capacity is seriously attenuated. The problems caused by this large volume chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/052H01M4/136H01M4/134
CPCH01M4/364H01M4/386H01M4/5815H01M4/38H01M4/134H01M4/136H01M10/052Y02E60/10
Inventor 罗明轩敏杰
Owner 高能时代(珠海)新能源科技有限公司
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