All-solid-state lithium battery and preparation method thereof

A lithium battery, all-solid-state technology, applied in the field of all-solid-state lithium batteries and their preparation, can solve problems such as reducing battery safety, and achieve the effects of improving energy density and safety, improving cycle life, and reducing internal resistance

Active Publication Date: 2021-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery not only solves the problem that the liquid electrolyte reduces the safety of the battery, but also slows down the battery life due to the use of a lithium-free negative electrode. The potential safety hazards caused by the direct use of metal lithium anodes compensate to a certain extent the decrease in battery energy density caused by the use of high-density solid-state electrolytes

Method used

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  • All-solid-state lithium battery and preparation method thereof
  • All-solid-state lithium battery and preparation method thereof

Examples

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Embodiment 1

[0108] Lithium bistrifluoromethanesulfonylimide, lithium difluorooxalate borate and lithium hexafluorophosphate (molar ratio 8:2:0.5), polyethylene glycol methyl ether methyl methacrylate monomer and polyethylene glycol diglycidyl ether The monomer (the molar ratio of the two monomers is 4:1), the azobisisobutyronitrile initiator is mixed and fully stirred to obtain a polymer electrolyte precursor, wherein the weight ratio of the lithium salt to the polymer monomer is 1: 7. The weight ratio of initiator and polymer monomer is 1:100; LiCoO with a weight ratio of 4:100 2 Powder and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The ceramic precursor powder is uniformly mixed, and then physically fused by a fusion machine, and heat-treated (air atmosphere, 700 ° C, 4 hours), and the surface is coated with Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 LiCoO 2 powder; the coated LiCoO 2 Powder, conductive agent carbon black and polyvinylidene fluoride binder are mixed in N-methylpyrrolidone, and LiCoO...

Embodiment 2

[0124] Lithium trifluoromethanesulfonate, lithium bisoxalate borate and lithium hexafluorophosphate (molar ratio 3:1:0.2), tetraethylene glycol dimethacrylate monomer and 1,4-butanediol glycidyl ether monomer (two The molar ratio of the first monomer is 3:1), the azobisisobutyronitrile initiator is mixed and fully stirred uniformly to obtain the polymer electrolyte precursor, wherein the weight ratio of the lithium salt to the polymer monomer is 1:4, and the initiator The weight ratio of the polymer monomer to the polymer monomer is 1:100; the LiNi with a weight ratio of 4:100 0.7 co0.15 mn 0.15 o 2 Powder and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The ceramic precursor powder is uniformly mixed, and then physically fused by a fusion machine, and heat-treated (air atmosphere, 700 ° C, 4 hours), and the surface is coated with Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 LiNi 0.7 co 0.15 mn 0.15 o 2 powder; the coated LiNi 0.7 co 0.15 mn 0.15 o 2 Powder, conductive agent and polyvi...

Embodiment 3

[0127] Lithium bisfluorosulfonyl imide, lithium difluorooxalate borate and lithium hexafluorophosphate (molar ratio 5:1:0.3), 2-acrylic acid-(5-ethyl-1,3-dioxan-5-yl ) methyl ester monomer and polypropylene glycol diglycidyl ether monomer (the molar ratio of the two monomers is 5:1), azobisisobutyronitrile initiator is mixed and fully stirred to obtain a polymer electrolyte precursor, wherein The weight ratio of lithium salt and polymer monomer is 1:10, and the weight ratio of initiator and polymer monomer is 1:100; LiNi with a weight ratio of 4:100 0.6 co 0.2 mn 0.2 o 2 Powder and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The ceramic precursor powder is evenly mixed, and the fusion machine is used for physical fusion and heat treatment (air atmosphere, 700 ° C, 4 hours), and the surface is coated with Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 LiNi 0.6 co 0.2 mn 0.2 o 2 powder; the coated LiNi 0.6 co 0.2 mn 0.2 o 2 Powder, conductive agent and polyvinylidene fluoride binder are ...

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Abstract

The invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery comprises a positive electrode, a negative electrode, a ceramic electrolyte layer and polymer solid electrolyte dispersed on the surfaces and gaps of the positive electrode, the negative electrode and the ceramic electrolyte layer, wherein the positive electrode comprises a positive electrode collector and a positive electrode layer attached to the surface of the positive electrode collector, the positive electrode layer comprises a positive electrode active material, and the surface of the positive electrode active material is coated with a high-voltage-resistant ceramic electrolyte; the negative electrode comprises a negative electrode collector and a surface modification layer attached to the surface of the negative electrode collector, and the surface modification layer comprises a carbon material and a binder. The ceramic electrolyte layer comprises a low-voltage-resistant ceramic electrolyte and a polymer binder; the coating can be independently layered or attached to the surface of a positive electrode; the polymer solid electrolyte comprises a polymer phase and a lithium salt dispersed in the polymer phase. The all-solid-state lithium battery disclosed by the invention has excellent safety performance, high energy density and excellent cycle stability.

Description

technical field [0001] The invention relates to the field of novel solid-state batteries, in particular to an all-solid-state lithium battery and a preparation method thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density of power batteries are getting higher and higher, but with the increase of battery energy density, the safety of batteries is facing challenges, especially metal lithium batteries that directly use metal lithium anodes. [0003] Traditional lithium batteries generally use organic carbonate-based liquid electrolytes, which are flammable and easily cause safety problems. In addition, in the liquid metal lithium battery directly using the lithium negative electrode, metal lithium is easy to form dendrites during repeated charging and discharging, and it is easy to pierce the separator and cause safety problems. Ceramic materials are nonflammable, so using solid ceramic elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M10/0562H01M10/052H01M10/058
CPCH01M4/628H01M4/667H01M4/663H01M10/0562H01M10/052H01M10/058H01M2300/0071H01M2220/20Y02P70/50
Inventor 谢健孙秋实赵新兵程继鹏
Owner ZHEJIANG UNIV
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