Lithium ion battery composite positive electrode material with core-shell structure, and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc.

Pending Publication Date: 2021-11-26
上海颂柏智能技术开发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage of lithium manganese phosphate LMP is relatively high, which matches the conventional electrolyte, but its capacity must be in the nanometer state to be able to play

Method used

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  • Lithium ion battery composite positive electrode material with core-shell structure, and preparation method thereof
  • Lithium ion battery composite positive electrode material with core-shell structure, and preparation method thereof

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Effect test

Embodiment 1

[0019] Embodiment 1 of the present invention: a lithium-ion battery composite cathode material with a core-shell structure:

[0020] Lithium-ion battery composite positive electrode material composition is (LiMn 2 o 4 ) 0.9 (LiMnPO 4 ) 0.1 ;LiMn 2 o 4 As the core material, LiMnPO 4 As the housing material, LiMnPO 4 to LiMn 2 o 4 Fully coated; LiMnPO 4 The thickness is 200nm.

Embodiment 2

[0021] Embodiment 2: a lithium-ion battery composite cathode material with a core-shell structure:

[0022] Lithium-ion battery composite positive electrode material composition is (LiNi 0.5 mn 1.5 o 4 ) 0.95 (LiMnPO 4 ) 0.05 ; The LiNi 0.5 mn 1.5 o 4 As the core material, LiMnPO 4 As the housing material, LiMnPO 4 To LiNi 0.5 mn 1.5 o 4 Fully coated; LiMnPO 4 The thickness is 100nm.

Embodiment 3

[0023] Embodiment 3: a lithium-ion battery composite cathode material with a core-shell structure:

[0024] Lithium-ion battery composite positive electrode material composition is (LiNi 0.5 mn 1.5 o 4 ) 0.85 (LiMnPO 4 ) 0.15 ;LiNi 0.5 mn 1.5 o 4 As the core material, LiMnPO 4 As the housing material, LiMnPO 4 To LiNi 0.5 mn 1.5 o 4 Fully coated; LiMnPO 4 The thickness is 900nm.

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Abstract

The invention provides a lithium ion battery composite positive electrode material with a core-shell structure. The composite positive electrode material is LTMOxLTMP1-x, and x is more than or equal to 0.75 and less than or equal to 0.95; LTMO is a core material, LTMP is a shell material, and the LTMO is completely coated by the LTMP; and the thickness of the LTMP ranges from 10 nm to 5000 nm. The invention further discloses a preparation method of the composite positive electrode material. According to the positive electrode material disclosed by the invention, the shell LTMP completely coats the inner core LTMO, so that the LTMO is completely separated from the electrolyte, the service life of the lithium ion battery is prolonged, the use safety performance of the lithium ion battery is improved, and meanwhile, the charging time of the battery is shortened; and according to the preparation method, particle distribution is easier to control in a proper range, and preparation of a high-energy positive electrode and a high-energy battery is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium-ion rechargeable battery materials, in particular to a lithium-ion battery composite cathode material with a core-shell structure and a preparation method thereof. Background technique [0002] At present, the lithium-ion battery cathode materials used by global lithium-ion battery manufacturers can be roughly divided into two categories, one is transition metal oxide lithium salt (LTMO), and its representative material is lithium cobalt oxide, ternary (nickel-manganese Lithium cobalt oxide NMC, lithium nickel cobalt aluminate NCA), lithium manganate and lithium nickel manganese oxide are spinel; the second type is transition metal lithium phosphate salt or olivine (LTMP). Each material has its advantages and disadvantages. [0003] The voltage of lithium cobaltate in transition metal oxide lithium salt LTMO is high, but its gram capacity utilization rate can only reach 50% of its theoretical val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/58H01M10/0525
CPCH01M4/364H01M4/50H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 孙升
Owner 上海颂柏智能技术开发中心
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