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High-safety power lithium ion secondary battery composite positive material and preparation method thereof

A composite positive electrode material and secondary battery technology, which is applied in the direction of secondary batteries, battery electrodes, batteries, etc., can solve the problems of battery cycle performance degradation, and achieve improved safety and cycle performance, large discharge capacity, and good cycle performance. Effect

Inactive Publication Date: 2017-04-26
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a synthetic method for a Li-Ni based composite positive electrode material for the problem that the existing Li-Ni based composite positive electrode material undergoes a side reaction with the electrolyte during the charge-discharge cycle, resulting in a decrease in the cycle performance of the battery. The wet coating process uniformly coats the bulk material, so that the coating layer can fully play its role, inhibit the corrosion of the material by the electrolyte, and prevent the phenomenon of uneven coating and part of the material exposed in the electrolyte, resulting in a decrease in battery performance , to meet the needs of high safety and long cycle in the lithium battery power market

Method used

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  • High-safety power lithium ion secondary battery composite positive material and preparation method thereof
  • High-safety power lithium ion secondary battery composite positive material and preparation method thereof
  • High-safety power lithium ion secondary battery composite positive material and preparation method thereof

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Embodiment 1

[0030] Nickel sulfate, cobalt sulfate and manganese sulfate are made into mixed solution according to Ni:Co:Mn molar ratio is 0.6:0.2:0.2 and mixes evenly, the total number of moles of Ni, Co, Mn three kinds of transition metal ions is 2mol / L, then Add 4 mol / L NaOH solution, transition metal ion solution and 4 mol / L ammonia water into the reaction vessel at the same time, control the pH value of the reaction system to 11.5, and the reaction temperature to 60°C. Then, the obtained precipitate was filtered, washed, and dried at 120° C. for 12 hours. Lithium carbonate and Ni 0.6 co 0.2 mn 0.2 (OH) 2 According to Li / M=1.12 (M is Ni 0.6 co 0.2 mn 0.2 (OH) 2 ), mixed in a high-speed mixer, calcined in a muffle furnace at 900°C for 12 hours, the atmosphere was 3L / min of air, the material was cooled with the furnace, crushed and passed through a 400-mesh sieve. Add 30mL of deionized water into the mixing tank, add 0.07g of aluminum isopropoxide and stir to dissolve, keep the t...

Embodiment 2-6

[0033] Pure phase LiNi obtained based on embodiment 1 0.6 co 0.2 mn 0.2 o 2 , adding aluminum isopropoxide of different quality, so that the coating amount of final aluminum is respectively 0.1%, 0.5%, 1%, 3%, 5%, other steps are the same as embodiment 1.

Embodiment 7-9

[0035] The Al oxide-coated Li-Ni composite positive electrode material was prepared similarly to Example 1, except that after Al coating, the sintering temperatures were 400°C, 600°C, and 700°C, respectively.

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Abstract

The invention relates to a high-safety power lithium ion secondary battery composite positive material and a preparation method thereof, the chemical formula of the high-safety power lithium ion secondary battery composite positive material is LixNiyCozMn1-y-zO2, 0.9 < x < 1.3, 0 <y< 1, 0 < z< 1, y+ z< =1, tapping density is greater than or equal to 1.5g / cm<3>, the preparation method is as follows: first, sodium hydroxide / potassium hydroxide mixed with ammonia is added into a solution of a soluble salt containing Ni-Co-Mn elements to obtain a Ni-Co-Mn hydroxide precursor, the dried precursor is mixed evenly with a lithium source or lithium hydroxide or lithium carbonate for high temperature sintering to obtain the LixNiyCozMn1-y-zO2, the LixNiyCozMn1-y-zO2 is added into a well-dissolved aluminum solution for drying by vacuum drying and heat treatment at 400-700 DEG C to obtain Al-coated LixNiyCozMn1-y-zO2. The coated positive electrode material has good safety performance and circulation performances, and can be used for long circulation and high safety lithium ion power batteries.

Description

technical field [0001] The invention relates to a lithium ion secondary battery cathode material and a preparation method thereof, in particular to a power lithium ion secondary battery composite cathode material and a preparation method thereof. Background technique [0002] The State Council issued the Energy Conservation and New Energy Vehicle Industry Development Plan (2012-2020), pointing out that new energy vehicles can effectively alleviate energy and environmental pressure, reduce vehicle fuel consumption, ease the contradiction between fuel supply and demand, reduce exhaust emissions, and improve the atmospheric environment. New energy vehicles refer to vehicles that adopt new power systems and rely entirely or mainly on new energy sources, mainly including pure electric vehicles, plug-in hybrid vehicles and fuel cell vehicles. The plan clearly stated that the main tasks are to strengthen the research on key core technologies of new energy vehicles, vigorously promo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 李晶晶田新勇徐云军程迪尹正中
Owner HENAN KELONG NEW ENERGY CO LTD
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