Double-coated composite solid lithium manganate material and preparation method thereof

A technology of lithium manganate and double coating is applied in the field of preparation of double-coated composite solid lithium manganate materials, and can solve the problems of difficulty in building a conductive network, poor conductivity of graphene oxide, and inability to achieve effective coating, etc. To achieve the effect of suppressing the Jahn-Teller effect, strong peeling ability, and easy to purchase

Inactive Publication Date: 2020-03-13
SUZHOU PHYLION BATTERY
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the publication number CN107331853A discloses a graphene composite multilayer porous spherical lithium manganate electrode material and a lithium ion battery prepared therefrom. First, the multilayer porous spherical lithium manganate is prepared by a precipitation method, and Stir and mix with graphene in a wet method, and obtain a graphene-composite lithium manganate material after drying. The problem with this method is that graphene agglomerates seriously, and simple stirring is difficult to disperse evenly, and the effect is poor.
In order to effectively disperse, graphene oxide can be used instead of graphene. The Chinese invention patent with the publication number CN108878856A discloses a preparation method of a graphene-lithium manganate battery positive electrode material. First, lithium manganate powder is prepared by precipitation method, and combined with Graphene oxide so

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] Weigh 2.91g of lithium carbonate, 8.22g of titanium dioxide, 0.93g of alumina, 20.89g of ammonium dihydrogen phosphate and 32.95g of ethanol, put them into a 100ml ball mill tank with a ball-to-battery ratio of 2:1, and ball mill for 4 hours to mix well and dry. Then placed in a muffle furnace at 750℃ for 12 hours to generate Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 . Add 200g monocrystalline lithium manganate, 2.4g LATP, and 80g graphene oxide aqueous solution to the sand mill, with a ball-to-battery ratio of 10:1, grind for 20 minutes, dry it, and place it in a tube furnace with a hydrogen content of 5% The argon mixture is kept at 900°C for 12 hours to prepare a lithium manganate cathode material double-coated with solid electrolyte and graphene.

[0028] The obtained lithium manganate cathode material was mixed with sp, CNTs and PVDF at a mass ratio of 95: 1: 2: 2, and NMP was added to stir the mixture into a cathode slurry, which was evenly coated on aluminum...

Example Embodiment

[0029] Example 2:

[0030] Weigh 3.78g of lithium carbonate, 15.51g of titanic acid, 5.06g of aluminum nitrate, 15.59g of diammonium hydrogen phosphate and 39.94g of ethanol, put them into a 100ml ball milling jar with a ball-to-battery ratio of 2:1, ball mill for 12 hours and mix well and bake After drying, place it in a muffle furnace at 650°C for 12 hours to generate LATP. Add 200g of monocrystalline lithium manganate, 6.0g of LATP, and 80g of graphene oxide aqueous solution to the sand mill, with a ball-to-battery ratio of 10:1, grind for 40 minutes, dry it and place it in a tube furnace with a hydrogen content of 1% The argon gas mixture was kept at 700°C for 4 hours to prepare a lithium manganate cathode material double-coated with solid electrolyte and graphene.

[0031] The obtained lithium manganate cathode material was mixed with sp, CNTs and PVDF at a mass ratio of 95: 1: 2: 2, and NMP was added to stir the mixture into a cathode slurry, which was evenly coated on alumi...

Example Embodiment

[0032] Example 3:

[0033] Weigh 1.89g of lithium hydroxide, 8.22g of titanium dioxide, 2.43g of aluminum nitrate, 20.89g of ammonium dihydrogen phosphate and 33.43g of ethanol, put them into a 100ml ball mill tank, with a ball-to-battery ratio of 2: 1, ball mill for 4 hours and mix well and bake After drying, place it in a muffle furnace at 800°C for 4 hours to generate LATP. Add 200g single crystal lithium manganate, 3.0g LATP, 80g graphene oxide aqueous solution into the sand mill, the ball-to-battery ratio is 10:1, grind for 8 minutes, dry it and place it in a tube furnace with 5% hydrogen content The argon mixture is kept at 900°C for 12 hours to prepare a lithium manganate cathode material double-coated with solid electrolyte and graphene.

[0034] The obtained lithium manganate cathode material was mixed with sp, CNTs and PVDF at a mass ratio of 95: 1: 2: 2, and NMP was added to stir the mixture into a cathode slurry, which was evenly coated on aluminum foil, and dried at 8...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a double-coated composite solid-state lithium manganate material and a preparation method thereof. The preparation method comprises the following steps of mixing and sinteringa lithium salt, a titanium salt, an aluminum salt and a phosphate raw material to obtain a solid-state electrolyte lithium titanium aluminum phosphate (Li <1+x> Al <x> Ti <2-x> (PO4) 3 (LATP); addingLATP, single crystal lithium manganate, a graphene oxide aqueous solution and zirconium oxide balls into a sand mill to be fully ground, nanocrystallizing the LATP and attaching the LATP to the surface of the lithium manganate, and meanwhile, coating the lithium manganate with graphene oxide; and after drying, reducing the graphene oxide into graphene at a high temperature in a hydrogen atmosphereto obtain the solid electrolyte and the graphene double-coated lithium manganate positive electrode material. According to the method, the consistency and repeatability of the material are ensured, the manufacturing cost is low, the solid electrolyte can inhibit the dissolution of manganese, the graphene blocks the reaction between the electrolyte and the positive electrode material, and the cycle performance and the high-temperature performance are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a double-coated composite solid lithium manganate material and a lithium ion battery. Background technique [0002] The specific capacity of positive electrode materials is the most important factor affecting the energy density and cycle life of lithium-ion batteries. Among the four common systems of lithium cobaltate, ternary materials, lithium iron phosphate and lithium manganate, lithium manganate has abundant resources and low cost. It is an ideal cathode material for power batteries due to its advantages of low cost, no heavy metals, high voltage, good safety, and good rate performance. However, its poor cycle performance and high temperature stability greatly limit its industrialization. The main reason is that lithium manganese oxide generates more Mn at the end of discharge. 3+ , prone to the Jahn-Teller effect, the disproportionation of triva...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/505H01M4/62H01M10/0525
CPCH01M4/505H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赵成龙王正伟朱华君王永琛张秀奎吴叶超
Owner SUZHOU PHYLION BATTERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap