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Solid-state battery with low interface impedance, and preparation method thereof

A solid-state battery and interface impedance technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve difficult problems such as electrolyte interface impedance

Pending Publication Date: 2021-05-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still great challenges in realizing the large-scale preparation of solid-state batteries, such as: it is difficult to overcome the interface impedance between the electrolyte and the positive and negative electrodes after the battery is solidified, and the non-negligible ion transport impedance between the positive and negative electrode particles

Method used

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  • Solid-state battery with low interface impedance, and preparation method thereof
  • Solid-state battery with low interface impedance, and preparation method thereof
  • Solid-state battery with low interface impedance, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A solid-state battery with low interfacial impedance, such as figure 1 As shown, the preparation is as follows:

[0034] (1) Add 10g of lithium iron phosphate, 0.16g of carbon black, 0.27g of PVDF, 0.16g of lithium lanthanum zirconate, and 0.005g of lithium hexafluorophosphate into an appropriate amount of NMP and mix evenly, and apply it on the surface of aluminum foil and roll it to obtain a composite positive electrode sheet 1 (single-sided Area density: 173g / m 2 ).

[0035] (2) Mix 10g of graphite, 0.05g of carbon black, 0.16g of CMC, 2.63g of SBR (solid content 4%), 0.16g of lithium lanthanum zirconate and 0.05g of lithium hexafluorophosphate into deionized water and coat them on the surface of copper foil Obtain composite negative electrode sheet 2 (single surface density is: 79g / m2) after roll pressing 2 ).

[0036] (3) Add 5g of PEO, 0.08g of lithium lanthanum zirconate and 0.03g of lithium hexafluorophosphate into an appropriate amount of tetrahydrofuran an...

Embodiment 2

[0039] A solid-state battery with low interfacial impedance, such as figure 1 As shown, the preparation is as follows:

[0040] (1) Add 10g of lithium iron phosphate, 0.16g of carbon black, 0.27g of PVDF, 0.16g of lithium lanthanum zirconate, and 0.005g of lithium hexafluorophosphate into an appropriate amount of NMP and mix evenly, and apply it on the surface of aluminum foil and roll it to obtain a composite positive electrode sheet 1 (single-sided Area density: 173g / m 2 ).

[0041] (2) Mix 10g of graphite, 0.05g of carbon black, 0.16g of CMC, 2.63g of SBR (solid content 4%), 0.16g of lithium lanthanum zirconate and 0.05g of lithium hexafluorophosphate into deionized water and coat them on the surface of copper foil Obtain composite negative electrode sheet 2 (single surface density is: 79g / m2) after roll pressing 2 ).

[0042](3) Add 5 g of PEO, 0.08 g of lithium zirconate lanthanum and 0.03 g of lithium hexafluorophosphate into an appropriate amount of tetrahydrofuran,...

Embodiment 3

[0045] A solid-state battery with low interfacial impedance, such as figure 1 As shown, the preparation is as follows:

[0046] (1) Add 10g of lithium iron phosphate, 0.16g of carbon black, 0.27g of PVDF, 0.16g of lithium lanthanum zirconate, and 0.005g of lithium hexafluorophosphate into an appropriate amount of NMP and mix evenly, and apply it on the surface of aluminum foil and roll it to obtain a composite positive electrode sheet 1 (single-sided Area density: 173g / m 2 ).

[0047] (2) Add 10g of graphite, 0.05g of carbon black, 0.16g of CMC, 2.63g of SBR (solid content 4%), 0.16g of lithium lanthanum zirconate and 0.05g of lithium hexafluorophosphate into an appropriate amount of deionized water and mix evenly. Obtain composite negative electrode sheet 2 after pressing (single surface density is: 79g / m 2 ).

[0048] (3) 5g of PEO, 0.08g of lithium lanthanum zirconate and 0.03g of lithium hexafluorophosphate were added to an appropriate amount of tetrahydrofuran and mix...

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Abstract

The invention discloses a solid-state battery with low interface impedance, and a preparation method thereof, and relates to the technical field of solid-state batteries. The solid-state battery is prepared by laminating or winding a positive plate with a coating on at least one side and a negative plate with a coating on at least one side together, laminating the coating surfaces, adopting hot pressing and then cold pressing to mutually fuse the coatings on the positive plate and the negative plate, and cooling and curing are performed to form a thermoplastic organic / inorganic electrolyte coating. The positive plate with the coating and the negative plate with the coating are obtained by respectively coating thermoplastic organic / inorganic electrolyte slurry on the composite positive plate and the composite negative plate and then drying; and the composite positive plate and the composite negative plate are obtained by adding an inorganic solid electrolyte, a lithium salt, a conductive agent, a binder and an active substance into a solvent to respectively prepare positive slurry and negative slurry, coating a current collector with the positive slurry and the negative slurry, curing and rolling. The ion interface impedance is effectively reduced, the electrochemical performance of the battery is improved, and industrialization is easy to realize.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a solid-state battery with low interface impedance and a preparation method thereof. Background technique [0002] As lithium-ion batteries are more and more widely used, the exposed problems are becoming more and more significant. While pursuing higher energy density and longer service life, the safety performance of batteries has become the focus of attention. Due to the presence of flammable, volatile, and leaky organic electrolytes in traditional lithium-ion batteries, people are concerned about the use of lithium-ion batteries, and safety accidents occur frequently. However, solid-state batteries assembled with solid electrolytes can effectively avoid liquid electrolytes. Safety hazards posed by electrolytes. The organic / inorganic composite electrolyte has the characteristics of high ionic conductivity, high mechanical strength, good flexibility and industrial...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/04H01M10/056H01M10/052H01M10/0585H01M10/0587
CPCH01M4/62H01M4/131H01M4/136H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/0404H01M4/0435H01M10/056H01M10/052H01M10/0585H01M10/0587H01M2300/0065H01M2300/0088Y02P70/50Y02E60/10
Inventor 张金华汪伟郑刚王金龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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