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Multi-level cooperative modified lithium battery positive electrode material and preparation method thereof

A cathode material, synergistic modification technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of protective effect, neglect and deterioration of the coating layer, achieve excellent cycle characteristics and storage characteristics, and improve cycling and storage. Equal performance and the effect of reducing side reactions

Active Publication Date: 2018-07-10
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all focus on modifying the bulk and / or surface of the material, while ignoring the primary particle surface of the material.
In the actual use process, when the battery is cycled for a certain number of weeks, the positive electrode material cracks, and the electrolyte enters the interior of the material particles, causing the coating layer to lose its proper protective effect. The electrolyte further erodes the surface of the primary particles inside the particles, and the resulting Side reactions rapidly degrade battery performance
Therefore, the current doping and cladding still have great limitations in improving material properties

Method used

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  • Multi-level cooperative modified lithium battery positive electrode material and preparation method thereof
  • Multi-level cooperative modified lithium battery positive electrode material and preparation method thereof
  • Multi-level cooperative modified lithium battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In the first step, the mixed aqueous solution of manganese sulfate, nickel sulfate and cobalt sulfate and the aqueous solution of magnesium sulfate are respectively passed into the In the continuous reaction kettle, a quantitative amount of sodium hydroxide solution and ammonia water are simultaneously passed through under the protection of nitrogen, and the reaction temperature is kept at 50° C., and precipitation is obtained by continuous overflow. Wash the obtained precipitate with water, filter and dry to obtain the hydroxide precursor Mn 0.295 Ni 0.500 co 0.200 Mg 0.005 (OH) 2 .

[0029] In the second step, the above precursor is mixed with lithium carbonate and molybdenum oxide at a molar ratio of 1:1.05:0.005, sintered at 950°C for 20 hours in an air atmosphere, naturally cooled, crushed, and sieved to obtain the composition Li 1.05 mn 0.295 Ni 0.500 co 0.200 Mg 0.005 Mo 0.005 o 2 powder.

[0030] The third step is to dry mix the obtained above-mentio...

Embodiment 2

[0032] Except for controlling the molar ratio of the second-step precursor to lithium carbonate and molybdenum oxide = 1:1.05:0.002, a positive electrode active material was obtained in the same manner as in Example 1 above.

Embodiment 3

[0034] The positive electrode active material was obtained in the same manner as in Example 1 above, except that the molar ratio of Al to the positive electrode material in the third step was controlled to be 0.01.

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Abstract

The invention discloses a multi-level cooperative modified lithium battery positive electrode material nickel-cobalt lithium manganate and a preparation method thereof. The prepared lithium battery positive electrode material nickel-cobalt lithium manganate is composed of lithium transition metal composite oxide particles which are expressed by a general formula LiaMn1-x-y-zNixCoyM1zM2wO2-(M3tOmt / 2), M1 elements are mainly distributed in primary particles of the material, M2 elements mainly exist on the surfaces of the primary particles, and M3 elements mainly exist on the surfaces of secondary particles of the material. According to the method, multi-level modification on the surfaces of the secondary particles, the surfaces of the primary particles and the interiors of the primary particles of the material can be achieved, the prepared material has good storage, output and circulation characteristics, and the application requirement of lithium-ion batteries, in particular to power batteries for vehicles is met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, and in particular relates to a multi-level synergistically modified lithium battery positive electrode active material nickel-cobalt lithium manganese oxide and a preparation method thereof. Background technique [0002] The development of electric vehicles is an effective means to deal with fuel shortages and environmental pollution. Lithium-ion batteries are widely used as the power source of electric vehicles due to their outstanding advantages such as long cycle life, low self-discharge rate, no memory effect, and environmental protection. However, the energy density of currently developed vehicle power batteries is generally low, and it is difficult to meet the requirements of longer cruising range, which limits its further promotion. The positive electrode material is the key material for power lithium batteries, and its energy density directly dete...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525Y02E60/10
Inventor 张学全刘亚飞陈彦彬茹敏朝
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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