High-nickel ternary positive electrode material as well as preparation method and application thereof

A positive electrode material, high-nickel technology, applied in the field of high-nickel ternary positive electrode materials and its preparation, can solve problems such as large internal stress, achieve the effects of reducing stress, good cycle stability, and suppressing microcracks

Inactive Publication Date: 2021-04-06
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a high-nickel ternary positive electrode material and its preparation method and application, so as to solve the problem of excessive internal stress in the circulation process of the high-nickel ternary material, and obtain a kind of primary particles that are more slender and secondary A high-nickel ternary cathode material with looser particles, better first cycle capacity and cycle stability

Method used

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  • High-nickel ternary positive electrode material as well as preparation method and application thereof
  • High-nickel ternary positive electrode material as well as preparation method and application thereof
  • High-nickel ternary positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0036] A method for preparing a high-nickel ternary positive electrode material, comprising the following steps:

[0037] (1) Preparation of precursor nickel cobalt manganese hydroxide (Ni0.96 co 0.01 mn 0.03 (OH) 2 ): 6056g of NiSO 4 ·6H 2 O, 67 g of CoSO 4 ·7H 2 O and 122g of MnSO 4 ·H 2 O was dissolved in 12L of deionized water, and the obtained metal sulfate aqueous solution was continuously injected into the batch reactor. At the same time, 14.4L of NH with a concentration of 2mol / L 3 ·H 2 O solution and 12 L of NaOH solution with a concentration of 4 mol / L were injected into the reactor, and the precursor was filtered after the precursor grew to about 10 μm, then washed, and finally vacuum-dried at 110 °C for 12 hours to obtain the precursor Ni 0.96 co 0.01 mn 0.03 (OH) 2 ;

[0038] (2) Take 500g Ni 0.96 co 0.01 mn 0.03 (OH) 2 The precursor was mixed with 230g of lithium hydroxide and 16.96g of diboron trioxide by dry ball milling. The ball milling time ...

Embodiment 2

[0040] A method for preparing a high-nickel ternary positive electrode material, comprising the following steps:

[0041] (1) Preparation of precursor nickel cobalt manganese hydroxide (Ni 0.96 co 0.01 mn 0.03 (OH) 2 ): the preparation method is as described in step (1) of Example 1;

[0042] (2) Take 500g Ni 0.96 co 0.01 mn 0.03 (OH) 2 The precursor was mixed with 230g lithium hydroxide and 30.12g boric acid by dry ball milling, and the ball milling time was 5h. After mixing evenly, calcinate at 800°C for 20 hours in an oxygen atmosphere, cool naturally to room temperature after the calcination, and pass through a 300-mesh sieve to remove oversized particles, and then obtain a boron-doped high-nickel ternary cathode material LiNi 0.95 co 0.01 mn 0.03 B 0.01 o 2 .

Embodiment 3

[0044] A method for preparing a high-nickel ternary positive electrode material, comprising the following steps:

[0045] (1) Preparation of precursor nickel cobalt manganese hydroxide (Ni 0.96 co 0.01 mn 0.03 (OH) 2 ): the preparation method is as described in step (1) of Example 1;

[0046] (2) Take 500g Ni 0.96 co 0.01 mn 0.03 (OH) 2 The precursor was mixed with 230g of lithium hydroxide and 19.49g of ammonium pentaborate by dry ball milling, and the ball milling time was 5h. After mixing evenly, calcinate at 800°C for 20 hours in an oxygen atmosphere, cool naturally to room temperature after the calcination, and pass through a 300-mesh sieve to remove oversized particles, and then obtain a boron-doped high-nickel ternary cathode material LiNi 0.95 co 0.01 mn 0.03 B 0.01 o 2 .

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Abstract

The invention belongs to the technical field of lithium ion batteries, and provides a high-nickel ternary cathode material and a preparation method and application thereof, the chemical formula of the high-nickel ternary cathode material is LiNixCoyMnzBiO2, B is at least one of diboron trioxide, boric acid, lithium tetraborate, ammonium pentaborate, ammonium fluoborate or boron carbide, x > / = 0.9, y>0, z>0, i is not smaller than 0.001 and is not greater than 0.1, and x+y+z+i=1. The preparation method comprises the following steps of ball-milling and mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source and a boron source, sintering and sieving to obtain the high-nickel ternary positive electrode material. Primary particles of the high-nickel ternary positive electrode material of the lithium battery are slender, interiors of secondary particles are looser, the high-nickel ternary positive electrode material of the lithium battery has higher first-circle capacity and better cycling stability, and the loose internal structure can reduce stress in the material in the cycling process, inhibit generation of microcracks, enhance the structural stability of the material and prolong the service life of the material; thus, a material having excellent cycle stability is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, electric vehicles have developed rapidly, and eye-catching electric vehicle companies such as Tesla, Weilai, and Xiaopeng Motors have emerged in the market. However, due to the high price and insufficient mileage of electric vehicles, there is still a long way to go before completely replacing fuel vehicles. [0003] The cruising range is one of the key indicators of electric vehicles, which largely depends on the reversible capacity of the positive electrode material in the vehicle power battery, layered nickel-cobalt lithium manganese oxide (LiNi x co y mn z o 2 , where x+y+z=1) Ternary cathode materials are widely used as cathode materials for power batteries due to their high reversible capacity. With the increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/628H01M10/052H01M10/0525C01G53/50C01P2004/03C01P2002/72H01M2004/021H01M2004/028Y02E60/10
Inventor 罗翠苹阮丁山陈希文刘伟健李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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