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Electrode material for sulfide all-solid-state battery and preparation method of electrode material

An electrode material and battery technology, applied in the direction of battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of expensive equipment, small processing cells, and increased battery costs, so as to improve cycle stability and life, and improve effective Contact area, the effect of increasing the conductive contact surface

Active Publication Date: 2022-01-14
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

However, the hot / cold isostatic pressing method has the following problems: on the one hand, the equipment is expensive; the processing process is complicated; the processing monomer is small, and the industrial application is difficult
On the other hand, even with this method, it is difficult to increase the effective contact area between the electrode materials, and the interface impedance is still large, which does not meet the development plan of high-performance batteries.
The method of battery pressurization can ensure the cycle of the battery, but it will also increase the cost of the rigid body of the battery, and the most important thing will reduce the overall energy density of the battery, which is not conducive to the development of solid-state batteries

Method used

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  • Electrode material for sulfide all-solid-state battery and preparation method of electrode material
  • Electrode material for sulfide all-solid-state battery and preparation method of electrode material
  • Electrode material for sulfide all-solid-state battery and preparation method of electrode material

Examples

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Effect test

Embodiment 1

[0031] An electrode material includes a positive electrode material and a composite ionic liquid layer coated on the surface of the positive electrode material. The components of the composite ionic liquid layer include an ionic liquid and a lithium ion ionizer. Among them, the cathode material is Li 2 Ni 0.8 co 0.1 mn 0.1 o 2 , the ionic liquid is [EMIM]BF 4 , the Li-ion ionizer is LiBF 4 .

[0032] The preparation method of above-mentioned electrode material, comprises the steps:

[0033] 1) Add 0.25mol / L LiBF 4 with [EMIM] BF 4 mixed to get LiBF 4 -[EMIM]BF 4 Compound ionic liquid, then add 20 times the volume of absolute ethanol to dilute LiBF 4 -[EMIM]BF 4 Composite ionic liquid to obtain positive electrode coating agent.

[0034] 2) Using LiNbO 3 to Li 2 Ni 0.8 co 0.1 mn 0.1 o 2 (NCM811) for coating: using a tubular fluidized bed to make Li 2 Ni 0.8 co 0.1 mn 0.1 o 2 Constantly tumbling and suspended above the air flow, spraying LiNbO 3 Coating t...

Embodiment 2

[0042] An electrode material includes a negative electrode material and a composite ionic liquid layer coated on the surface of the negative electrode material. The components of the composite ionic liquid layer include an ionic liquid and a lithium ion ionizer. Among them, the negative electrode material is lithium powder, and the ionic liquid is [TMPA] (CF 3 SO 2 ) 2 N, Li-ion ionizer is Li(CF 3 SO 2 ) 2 N.

[0043] The preparation method of above-mentioned electrode material, comprises the steps:

[0044] 1) 0.3mol / L of Li(CF 3 SO 2 ) 2 N and [TMPA] (CF 3 SO 2 ) 2 N mixed to get Li(CF 3 SO 2 ) 2 N-[TMPA](CF 3 SO 2 ) 2 N complex ionic liquid, then add 20 times volume of anhydrous DMF (N, N-dimethylformamide), dilute Li(CF 3 SO 2 ) 2 N-[TMPA](CF 3 SO 2 ) 2 N complex ionic liquid to obtain negative electrode coating agent.

[0045]2) Place the lithium powder in the tubular fluidized bed so that the lithium powder is continuously tumbling and suspended a...

Embodiment 3

[0051] An electrode material comprises a positive electrode material, a negative electrode material, and a composite ionic liquid layer coated on the surface of the positive electrode material and the negative electrode material. The components of the composite ionic liquid layer include an ionic liquid and a lithium ion ionizer. Among them, the cathode material is Li 2 CoO 2 , the anode material is graphite powder, the ionic liquid is [EMIM]PF 6 and [TMPA] (CF 3 SO 2 ) 2 N, Li-ion ionizer is Li(CF 3 SO 2 ) 2 N.

[0052] The preparation method of above-mentioned electrode material, comprises the steps:

[0053] 1) 0.2mol / L of Li(CF 3 SO 2 ) 2 N with [EMIM]PF 6 mixed to get Li(CF 3 SO 2 ) 2 N-[EMIM]PF 6 Compound ionic liquid, then add 20 times the volume of absolute ethanol, dilute Li(CF 3 SO 2 ) 2 N-[EMIM]PF 6 Composite ionic liquid to obtain positive electrode coating agent.

[0054] 2) 0.2mol / L of Li(CF 3 SO 2 ) 2 N and [TMPA] (CF 3 SO 2 ) 2 N mixe...

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Abstract

The invention belongs to the technical field of batteries, and discloses an electrode material for a sulfide all-solid-state battery and a preparation method of the electrode material. The electrode material comprises an electrode material matrix and a composite ionic liquid layer coating the surface of the electrode material matrix, and the composite ionic liquid layer comprises an ionic liquid and a lithium ion ionization agent. After the electrode material, sulfide solid electrolyte and other materials are combined into a solid-state battery, the ionic liquid can be filled in nano gaps in the solid-state battery so that the gaps between the sulfide solid electrolyte and the electrode material are filled, the grain boundary between the electrolyte is reduced, and the density in the battery is improved; and the effective contact area of the electrode material and the electrolyte is increased, the lithium ion ionization agent can be taken into the gaps in the battery by virtue of the ionic liquid, and the conduction contact surface of lithium ions is increased so that the interface impedance among the materials in the battery is reduced, and the cycling stability and the service life of the battery are improved and prolonged.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrode material for a sulfide all-solid-state battery and a preparation method thereof. Background technique [0002] Sulfide solid-state electrolytes have received extensive attention due to their high ionic conductivity. However, the sulfide solid electrolyte itself will produce a large number of micropores (pore size <100nm) during the sintering process, resulting in a low density (<98%) of the directly cold-pressed sulfide solid electrolyte, which reduces the ionic conductivity of the electrolyte itself. . On the other hand, due to the large elastic modulus and poor deformability of the traditional oxide positive electrode and other negative electrodes, the contact between the sulfide solid electrolyte and this type of electrode material is poor, and the effective contact area is less than 95%, which increases the interface resistance. , which impa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
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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