Modified positive electrode material precursor, preparation method thereof, modified positive electrode material and lithium battery

A cathode material and precursor technology, which is applied in the field of modified cathode material precursors, can solve the problems of poor safety and change in the surface structure of cathode materials, and achieves the effects of uniform size, short reaction time, and improved coating efficiency.

Active Publication Date: 2019-06-21
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of utilization, especially for high-nickel materials, as the nickel content increases, the energy density of the battery will further increase, but the safety will also deteriorate; in addition, during the cycle, the battery capacity decays faster, This is mainly because the transition metal nickel ions on the surface of the positive electrode material will dissolve into the electrolyte, which will change the surface structure of the positive electrode material.

Method used

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  • Modified positive electrode material precursor, preparation method thereof, modified positive electrode material and lithium battery
  • Modified positive electrode material precursor, preparation method thereof, modified positive electrode material and lithium battery
  • Modified positive electrode material precursor, preparation method thereof, modified positive electrode material and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0113] Preparation of positive electrode material precursor: the positive electrode material precursor Ni with a mass of 32.29g 0.78 co 0.1 mn 0.12 (OH) 2 , 0.92g of diammonium hydrogen phosphate was dissolved in 500g of water to obtain a solution of diammonium hydrogen phosphate, mixed and stirred for 0.5h to obtain mixture A, 1.84g of nickel sulfate was dissolved in 500g of water to form nickel sulfate aqueous solution and mixture A respectively through impinging flow reaction The reactor is reacted, and the mixture A is 23l / h through one end of the feed pipe 2 in the reactor, and the linear velocity is 0.51m / s to enter the impingement flow reaction device, and the nickel sulfate aqueous solution passes through the other end of the feed pipe 2. One end is 20l / h with flow rate, and linear velocity is 0.44m / s and mixture A enters impingement flow reaction device simultaneously and reacts, obtains the positive material precursor (the cathode material precursor of nickel phosp...

Embodiment 2

[0123] The preparation of positive electrode material precursor: the positive electrode material precursor Ni that mass is 32.29g 0.7 co 0.15 mn 0.15 (OH)) 2 , 0.53g of diammonium hydrogen phosphate was dissolved in 250g of water to obtain a solution of diammonium hydrogen phosphate and mixed and stirred for 2h to obtain mixture A, 1.69g of cobalt sulfate was dissolved in 250g of water to form an aqueous solution of cobalt sulfate and mixture A respectively through an impact flow reactor Reaction, the mixture A is 12l / h by one end of the feed pipe 2 in the reactor, and the linear velocity is 0.27m / s to enter the impingement flow reaction device, and the cobalt sulfate aqueous solution passes the other end of the feed pipe 2 to The flow rate is 10l / h, the linear velocity is 0.22m / s, and the mixture A enters the impingement flow reaction device to react at the same time. After the reaction, it is filtered, washed, and dried in an oven at 100°C to obtain a modified cathode mate...

Embodiment 3

[0131] Preparation of positive electrode material precursor: the positive electrode material precursor Ni with a mass of 3235.4g 0.8 co 0.1 mn 0.1 CO 3 , a concentration of 0.05mol / l ammonia mixed to obtain a mixture A, 99.51g Zr (SO 4 ).5H 2 O and 56.88g H 3 BO 3 The aqueous solution mixture (water is 15kg) and mixture A are respectively reacted by impinging flow reactor, and described mixture A is 315.0l / h with flow rate through one end of feed pipe 2 in the reactor, and linear velocity is 0.77m / s enters The impingement flow reaction device, the nickel sulfate aqueous solution passes through the other end of the feed pipe 2 with a flow rate of 300.0l / h and a linear velocity of 0.74m / s and the mixture A enters the impingement flow reaction device at the same time to react. Dry to obtain a modified positive electrode material precursor (zirconium borate-coated positive electrode material precursor). The impingement flow reactor is the same as in Example 1.

[0132] Pre...

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Abstract

The invention provides a modified positive electrode material precursor, which comprises an positive electrode material precursor and metal salt coated on the positive electrode material precursor. The safety performance and the cycle performance of the battery obtained by the modified positive electrode material precursor are significantly improved.

Description

technical field [0001] The invention relates to a modified cathode material precursor, a preparation method thereof, a modified cathode material and a lithium battery Background technique [0002] As the technology of mobile devices develops and the demand continues to increase, the demand for secondary batteries as energy sources has increased significantly. Lithium secondary batteries having properties of high energy density, high voltage, long cycle life, and low self-discharge rate have been commercialized and widely used. [0003] In lithium batteries, materials capable of reversibly intercalating and deintercalating lithium ions are used for the positive and negative electrodes, respectively. At present, lithium cobalt oxide cathode materials are more and more widely used in lithium battery cathode materials. However, the high cost, poor rate performance and unsafe performance of lithium cobalt oxide itself limit its application in the battery field. [0004] Transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCY02E60/10
Inventor 布莱恩·托马斯·米本凌红亚郭会杰文娟·刘·麦蒂斯
Owner 微宏先进材料公司
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