Solid-state ion conductor and lithium-enrich manganese-based material composite electrode and lithium ion battery

A lithium-ion battery and ion conductor technology, applied in the direction of electrode carrier/collector, battery electrode, secondary battery, etc., can solve the problem of high cost, complicated preparation process, difficulty in controlling the integrity and thickness uniformity of the coating layer on the surface of the material and other issues, to achieve the effect of low manufacturing cost, good reproducibility, and excellent lithium ion conductivity

Inactive Publication Date: 2019-04-16
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, the integrity and uniformity of the coating layer on the surface of the material are difficult to control, the preparation process is complicated, and the cost is high, which limits its industrial application.

Method used

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  • Solid-state ion conductor and lithium-enrich manganese-based material composite electrode and lithium ion battery
  • Solid-state ion conductor and lithium-enrich manganese-based material composite electrode and lithium ion battery
  • Solid-state ion conductor and lithium-enrich manganese-based material composite electrode and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 90 parts of 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 type Li-rich manganese-based materials with 2 parts of solid-state ionic conductor Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , grind and mix in a mortar for 0.5h, then add the obtained mixed powder, 2 parts of conductive carbon black, 2 parts of conductive graphite, and 4 parts of PVDF into NMP, and stir well to obtain a lithium-rich manganese-based electrode slurry After that, the slurry is coated on an aluminum foil, dried, and rolled to obtain a composite electrode sheet of a solid-state ion conductor and a lithium-rich manganese matrix. The lithium-rich manganese-based electrode pole piece, separator and lithium sheet were assembled in an argon-filled glove box, and the electrolyte was injected to prepare a lithium-rich manganese-based lithium-ion button battery.

[0036] The high-rate discharge performance of the battery of the comparative example and the battery of Example 1 was tested. Wherein, the discharge spec...

Embodiment 2

[0039] Take 90 parts of 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 type Li-rich manganese-based materials with 1 part of solid-state ionic conductor Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , grind and mix in a mortar for 0.5h, then add the obtained mixed powder, 2 parts of conductive carbon black, 3 parts of conductive graphite, and 4 parts of PVDF into NMP, and stir well to obtain a lithium-rich manganese-based electrode slurry After that, the slurry is coated on an aluminum foil, dried, and rolled to obtain an electrode sheet composed of a solid-state ion conductor and a lithium-rich manganese matrix. The lithium-rich manganese-based electrode pole piece, separator and lithium sheet were assembled in an argon-filled glove box, and the electrolyte was injected to prepare a lithium-rich manganese-based lithium-ion button battery.

[0040] The discharge specific capacity of the battery reaches 201.2mAh / g at the 0.1C rate, 167.2mAh / g at the 0.5C rate, 150.2mAh / g at the 1C rate, and 15...

Embodiment 3

[0043] Take 92 parts of 0.6Li 2 MnO 3 0.4LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 type Li-rich manganese-based materials with 3 parts of solid-state ionic conductor Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , ball milling and mixing for 1 h, then adding the resulting mixed powder, 1.8 parts of conductive carbon black, 0.2 parts of carbon nanotubes, and 3 parts of PVDF into NMP, and fully stirring to obtain a lithium-rich manganese-based electrode slurry, and then The slurry is coated on the aluminum foil, and after drying, rolling and slicing, the lithium-rich manganese-based electrode sheet is obtained. Mix the artificial graphite negative electrode material, conductive carbon black, conductive graphite, and PVDF uniformly in a ratio of 93:1:1:5, coat it on the copper foil, and obtain the negative electrode sheet after drying, rolling, and slicing. The lithium-rich manganese-based electrode pole piece, separator, and negative electrode pole piece are assembled and sealed into an aluminum-pl...

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Abstract

The invention provides a solid-state ion conductor and lithium-enrich manganese-based material composite electrode. The solid-state ion conductor and lithium-enrich manganese-based material compositeelectrode comprises a lithium-enrich manganese-based material and a solid-state ion conductor, and the chemical formula of the lithium-enrich manganese-based material is xLi2MnO3.(1-x)LiMO2, wherein xis greater than 0 and less than 1, and M is one or more of Mn, Ni and Co; and the chemical formula of the solid-state ion conductor is Li<1+a>[AB<2-c>(DO4)3] or Li<2+alpha>E<beta>G<3+gamma>. The invention further provides a lithium ion battery comprising the composite electrode. The solid-state ion conductor has excellent ionic conductivity and is composited in the lithium-enrich manganese-based electrode, and the lithium ion transmission rate of the electrode can be increased. In the battery charging and discharging processes, the solid-state ion conductor participates in the forming process of a solid electrolyte membrane on the surface of the lithium-enrich manganese-based material, the membrane impedance of the lithium-enrich manganese-based positive electrode is lowered, and thusthe rate performance and cycling stability of the lithium-enrich manganese-based electrode are improved.

Description

technical field [0001] The invention belongs to the field of battery materials, in particular to a positive pole of a lithium ion battery and a lithium ion battery containing the positive pole. Background technique [0002] Since the commercialization of lithium-ion batteries by Sony in 1991, lithium-ion batteries have been widely used in miniaturized electronic products, energy storage devices, electric vehicles and other fields due to their advantages such as high energy density, long cycle life and no memory effect. Lithium-ion batteries are mainly composed of four basic components: positive electrode material, negative electrode material, electrolyte and separator. The positive electrode material is generally used as a provider of lithium ions. The positive electrode material largely determines the energy density, properties such as power density and service life. At present, the commonly used cathode materials are LiCoO 2 、LiNi x co y mn 1-x-y o 2 and LiFePO 4 Wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525H01M4/66H01M4/1391
CPCH01M4/1391H01M4/362H01M4/485H01M4/505H01M4/667H01M10/0525Y02E60/10
Inventor 黄贤凯邵泽超王建涛武兆辉马磊磊武佳雄卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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