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Long-circulation and high-power lithium ion battery positive electrode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials is applied in the field of positive electrode materials for lithium ion batteries and their preparation to achieve the effects of achieving mechanical properties, improving cycle performance at room temperature and high temperature, and reducing deterioration

Active Publication Date: 2021-05-07
HUNAN CHANGYUAN LICO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at some problems existing in current power positive electrode materials, and aims to provide a long-cycle, high-power lithium-ion battery single-crystal hollow positive electrode material and its preparation method to improve the compaction and cycle performance of the material

Method used

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  • Long-circulation and high-power lithium ion battery positive electrode material and preparation method thereof
  • Long-circulation and high-power lithium ion battery positive electrode material and preparation method thereof
  • Long-circulation and high-power lithium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0044] Preparation of Hollow Single Crystal NCM622 Ternary Cathode Material

[0045] For the 622 ternary cathode material, considering its cycle and rate requirements, the thickness of the single crystal shell layer will be appropriately reduced in the process of designing the structure, but the particle size will be comprehensively controlled under the condition of 3.5 μm according to the pressure it can withstand. The thickness of the outer single crystal is between 0.5 and 0.75 μm.

[0046] A long-cycle, high-power lithium-ion battery positive electrode material of the present invention, the lithium-ion battery positive electrode material is a single crystal or a single-crystal-like morphology, its secondary particles are hollow, and the secondary particles include a plurality of primary particles The single crystal shell as a whole and the hollow part inside the shell are fused together.

[0047] The molecular formula of lithium-ion battery cathode material is LiNi 0.6 c...

Embodiment 2

[0084] A lithium-ion battery positive electrode material, the lithium-ion battery positive electrode material is a single crystal or a single crystal-like morphology, and its secondary particles have a hollow structure, and the secondary particles include a plurality of primary particles fused with each other as a whole. The average diameter of the secondary particles in the crystal shell and the hollow part inside the shell is 4 μm, the average diameter of the hollow part is 0.8-1.0 μm, and the volume of the hollow part of the secondary particles accounts for 0.8-2 of the entire secondary particle. %.

[0085] A preparation method of the lithium ion battery cathode material of the present embodiment, comprising:

[0086] Step 1: Preparation of Precursor

[0087] According to the molar ratio of 6:2:2, nickel sulfate, manganese sulfate and cobalt sulfate are configured as a 1.5M metal ion solution, and then 1.5M ammonia water and 1.5M NaOH solution are respectively added to th...

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Abstract

The invention discloses a long-circulation and high-power lithium ion battery positive electrode material, of which the molecular formula is LiNi<x>Co<y>Mn<1-x-y-z>Z O<2>. The long-circulation and high-power lithium ion battery positive electrode material comprises a single crystal or quasi-single crystal shell layer and a hollow part, wherein the single crystal or quasi-single crystal shell layer is formed by mutual fusion of primary particles, and the volume of the hollow part of secondary particles accounts for 0.8-50% of the volume of the whole secondary particles. The invention further discloses a preparation method, which comprises the following steps of: preparing a hydroxide precursor with crystallinity and morphology difference in the radial direction; and mixing the precursor with a lithium compound, and carrying out two-stage sintering on the mixture to obtain the lithium ion battery positive electrode material, wherein the first sintering is rapid heating, the temperature of the second sintering is higher than that of the first stage, and the second sintering enables the primary particles to be fused and mutually fused to form a single single crystal shell layer. The lithium ion battery positive electrode material disclosed by the invention is good in normal-temperature and high-temperature cycle performance and safety performance, can improve mechanical and electrochemical performance and compaction density, has the characteristics of quick charge, high capacity, high voltage, high cycle and low cost, and can be suitable for high-power motor vehicles.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a long-cycle, high-power lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] As a new type of green energy storage device, lithium-ion battery occupies a pivotal position in the field of secondary batteries due to its superior performance. Among them, the positive electrode material is the core that affects the performance of lithium-ion batteries. At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobaltate, lithium manganese oxide, lithium iron phosphate and ternary materials. [0003] However, with the continuous improvement of energy density and the incentives of national policies, power batteries have shown rapid development, and ternary materials have been used by many new energy vehicles due to their high capacity advantages. The ternary materials that ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525C30B29/66C30B1/10C30B29/22
CPCH01M4/505H01M4/525H01M4/485H01M10/0525C30B29/66C30B1/10C30B29/22Y02E60/10
Inventor 赵俊豪李厦周友元熊学李旻黄滔黄承焕周耀
Owner HUNAN CHANGYUAN LICO CO LTD
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