Large scale preparation method of high-nickel cobalt-free precursor and cathode material

A large-scale preparation and cathode material technology, applied in the field of energy storage materials and electrochemistry, can solve the problems of difficulty in controlling the growth of primary particle crystals, affecting high-temperature cycles and high-temperature storage, poor structural stability and high-temperature stability, etc., to achieve beneficial Large-scale market promotion, improved thermal stability, high temperature cycle and high temperature storage excellent effect

Active Publication Date: 2019-07-05
姚兵
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this process, there are many parameters that need to be adjusted, and it is very difficult to realize the synergy of each parameter, so it is very difficult to control the growth of primary particle crystals.
[0004] While high-nickel materials have high energy density, their disadvantages are also obvious. Their structural stability and high temperature stability are poor, and the particles on the surface are prone to phase transition: layered structure → spinel structure → rock salt structure (i

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  • Large scale preparation method of high-nickel cobalt-free precursor and cathode material
  • Large scale preparation method of high-nickel cobalt-free precursor and cathode material
  • Large scale preparation method of high-nickel cobalt-free precursor and cathode material

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[0055] The present invention is a large-scale preparation method of a high-nickel and cobalt-free precursor and positive electrode materials. In the case, the large-scale preparation of a high-nickel and cobalt-free precursor includes:

[0056] A high-nickel cobalt-free cathode material precursor, the high-nickel cobalt-free precursor such as the general formula Ni x m y N z (OH) 2 Shown, where M = one of (Al, Ba, Pr, Ce, Cr, Mn, Ti, Sr, Zr, Ge, Er, W), N = (La, Nd, Dy, Eu, Nb, Mg , one of Yb, Lu, Sn, Mo), x+y+z=1, 0.6≤x<1, 0≤y<0.5, 0≤z<0.5.

[0057] Preferred Example 1: The high-nickel cobalt-free cathode material precursor such as the general formula Ni 0.90 Ti 0.09 Mg 0.11 (OH) 2 As shown, that is, x=0.90, y=0.09, z=0.11.

[0058] Preferred Example 2: The precursor of the high-nickel and cobalt-free positive electrode material is such as the general formula Ni 0.88 Mg 0.12 (OH) 2 As shown, that is, x=0.88, y=0.12, z=0.

[0059] Preferred Example 3: The precursor...

Embodiment 1

[0083] A large-scale preparation method of a high-nickel-cobalt-free precursor and anode material, including (1) a high-nickel-cobalt-free cathode material precursor and (2) a high-nickel-cobalt-free cathode material, the large-scale preparation of both.

[0084] Wherein (1) comprises the following steps:

[0085] 1) Sodium hydroxide and ammonia water are prepared into a reaction bottom solution with pH=11 and ammonia concentration of 0.3mol / L; sodium hydroxide is prepared into 2.0mol / L sodium hydroxide solution; ammonia water is prepared into 2.4mol / L Ammonia solution; the inorganic salts of nickel, aluminum and magnesium are dissolved in deionized water after deoxidation to prepare a mixed solution of inorganic salts with a total concentration of 2.5mol / L, wherein the molar ratio of nickel, cobalt and manganese is 0.94: 0.045:0.015;

[0086] 2) Pour the reaction bottom liquid of step 1) into the reaction kettle, stir and pass nitrogen protection, and heat up; the stirring s...

Embodiment 2

[0099] A large-scale preparation method of a high-nickel-cobalt-free precursor and anode material, including (1) a high-nickel-cobalt-free cathode material precursor and (2) a high-nickel-cobalt-free cathode material, the large-scale preparation of both.

[0100] Wherein (1) comprises the following steps:

[0101] 1) Sodium hydroxide and ammonia water are prepared into a reaction bottom solution with pH=11 and ammonia concentration of 0.3mol / L; sodium hydroxide is prepared into 2.0mol / L sodium hydroxide solution; ammonia water is prepared into 2.4mol / L Ammonia solution; dissolving inorganic salts of nickel and strontium in deionized water after deoxidization to prepare a mixed solution of inorganic salts with a total concentration of 2.0mol / L, wherein the molar ratio of nickel and strontium is 0.96:0.04;

[0102] 2) Pour the reaction bottom liquid of step 1) into the reaction kettle, stir and pass nitrogen protection, heat up; the stirring speed is set to 250rpm, the temperatu...

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Abstract

The invention discloses a large scale preparation method of a high-nickel cobalt-free precursor and a cathode material. During the co-precipitation reaction process, the key parameters are precisely controlled, thus the crystal face, morphology, and assembly arrangement mode of primary particles are regulated and controlled to obtain the high-nickel cobalt-free cathode material precursor with uniform morphology, the precursor can be used to prepare the high-nickel cobalt-free lithium battery cathode active material, which has the advantages of low residual alkali, low pH value, water absorption resistance, and good processing performance, moreover, the cathode material does not contain any precious metal and is cheap; the prepared lithium battery has the advantages of high cell primary effect, high capacity, excellent normal temperature cycle performance, good high temperature cycle performance, and excellent high temperature storage performance; moreover, the thermal stability is greatly improved through doping and coating; the preparation process is simple and efficient; and the obtained product is highly uniform, has excellent electrochemical properties, and has a wide market prospect.

Description

technical field [0001] The invention relates to the field of energy storage materials and electrochemical technology, in particular to a large-scale preparation method of high-nickel and cobalt-free precursors and positive electrode materials. Background technique [0002] In the ternary cathode material, the main function of nickel is to participate in the oxidation-reduction reaction, which is used to increase the energy density. Surface materials with higher nickel content have higher energy density. The main role of cobalt in the ternary cathode material is to improve crystal conductivity and stabilize the structure. However, because cobalt is very expensive and lacks natural resources, it is not conducive to large-scale use. Therefore, Al, Ba, Mg, Ce, Cr, Mn, Ti, Sr, Zr, Ge, Er, W, La, Nd, Dy, Eu, Nb, Pr, Yb, Lu, Sn, Mo and other elements can be used instead of cobalt The role of elements in ternary materials. [0003] The precursor will determine the basic properties...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/525
CPCC01G53/00C01G53/006C01P2002/72C01P2004/03C01P2004/61H01M4/485H01M4/525Y02E60/10
Inventor 吴黎明温美盛刘桥
Owner 姚兵
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