A modified positive electrode material precursor, its preparation method, 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 surface structure change and safety deterioration of cathode materials, and achieves the improvement of utilization rate, effective impact, and realization of large-scale industrial production needs. Effect

Active Publication Date: 2022-06-24
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A modified positive electrode material precursor, its preparation method, modified positive electrode material and lithium battery
  • A modified positive electrode material precursor, its preparation method, modified positive electrode material and lithium battery
  • A modified positive electrode material precursor, its preparation method, modified positive electrode material and lithium battery

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Effect test

Embodiment 1

[0114] Preparation of cathode material precursors: the mass of 32.29g cathode material precursor Ni 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 were reacted by impingement flow respectively The reaction is carried out in the reactor, the mixture A enters the impact flow reaction device through one end of the feed pipe 2 in the reactor at a flow rate of 23 l / h and a linear velocity of 0.51 m / s, and the nickel sulfate aqueous solution passes through the other side of the feed pipe 2. At one end, the flow rate is 20l / h, the linear velocity is 0.44m / s and the mixture A enters the impinging flow reaction device to react at the same time. After the reaction, a modified positive material precursor (a positive electrode ...

Embodiment 2

[0124] Preparation of cathode material precursors: the mass of 32.29g cathode material precursor Ni 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, mixed and stirred for 2h to obtain mixture A, 1.69g of cobalt sulfate was dissolved in 250g of water to form a cobalt sulfate aqueous solution and mixture A were respectively carried out through a percussion flow reactor Reaction, the mixture A enters the impinging flow reaction device through one end of the feed pipe 2 in the reactor with a flow rate of 12l / h and a linear velocity of 0.27m / s, and the cobalt sulfate aqueous solution passes through 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 impinging flow reaction device at the same time to react. After the reaction, it is filtered, washed, and dried in an oven at 100 °C to obtain a modified cathode...

Embodiment 3

[0132] Preparation of cathode material precursors: The cathode material precursor Ni with a mass of 3235.4g 0.8 Co 0.1 Mn 0.1 CO 3 , the concentration of 0.05mol / l ammonia water was mixed to obtain 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 through the impingement flow reactor, and the mixture A enters through one end of the feed pipe 2 in the reactor with a flow rate of 315.0l / h and a linear velocity of 0.77m / s. The impinging flow reaction device, the Zr(SO 4 ).5H 2 O and H 3 BO 3 The aqueous solution mixture (water is 15kg) 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 enters the impact flow reaction device simultaneously with the mixture A to react, and after the reaction is dried at 80 ℃ to obtain Modified cathode material precursor (zirconium borate-coated cathode material precursor). Described impingement flo...

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Abstract

The invention provides a modified cathode material precursor, including the cathode material precursor and a metal salt coated on the cathode material precursor. Both the safety performance and 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 positive electrode material precursor, a preparation method thereof, a modified positive electrode material and lithium [0002] Battery Background technique [0003] As technological development and demand for mobile devices continue to increase, the demand for secondary batteries as an energy source has grown significantly. Lithium secondary batteries with high energy density, high voltage, long cycle life, and low self-discharge rate properties have been commercialized and widely used. [0004] 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 fi...

Claims

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Application Information

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Patent Type & Authority Patents(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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