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Ternary precursor material, positive electrode material and preparation method of primary particle packing density with inner dense and outer loose structure

A technology of particle packing density and positive electrode material, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high initial capacity, harsh conditions, and large irreversible capacity of layered lithium manganate, and achieve rate and cycle performance. Excellent, simple preparation process, low cost of materials

Active Publication Date: 2016-12-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual specific capacity of lithium nickelate material is higher, and the cost is lower than that of lithium cobaltate, but the conditions in the preparation process are harsh, and the irreversible capacity of the material is also large due to the structure change caused by cation mixing. In addition, the safety performance of the material is not good. not ideal
Layered lithium manganate has high initial capacity and low cost, but the capacity retention rate is not ideal due to the John-Teller effect during the cycle
[0004] As mentioned above, layered LiMO 2 The practical application of materials (M=Ni, Co, Mn, etc.) is limited due to the defects of their own properties

Method used

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  • Ternary precursor material, positive electrode material and preparation method of primary particle packing density with inner dense and outer loose structure
  • Ternary precursor material, positive electrode material and preparation method of primary particle packing density with inner dense and outer loose structure
  • Ternary precursor material, positive electrode material and preparation method of primary particle packing density with inner dense and outer loose structure

Examples

Experimental program
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Embodiment 1

[0053] Preparation molar ratio is Ni: Co: Mn=8: 1: 1 and total concentration is nickel sulfate, manganese sulfate, cobalt sulfate metal salt solution of 2mol / L, the complexing agent ammonia solution of 2.8mol / L, the 2mol / L Precipitating agent Sodium hydroxide solution, 1mol / L sodium dodecylsulfonate hot water solution. Complexing agent solution, deionized water, surfactant aqueous solution according to 1 ∶ 6 ∶ A total of 800ml solution at a molar ratio of 1 was added to the reactor as the reaction bottom solution at zero time; the metal salt solution, the complexing agent ammonia solution of 2.8mol / L and the precipitating agent sodium hydroxide solution of 2mol / L were mixed at a certain rate ratio (1:1:2) is added in the reactor of high-speed stirring, wherein the mixed solution of sodium dodecylsulfonate is introduced in the first 12 hours, the pH of the whole reaction system is controlled at 10 ± 0.3, the temperature is controlled at 58 ° C, and the reaction is carried out ...

Embodiment 2

[0061] Preparation molar ratio is Ni: Co: Mn=8: 1: 1 and total concentration is nickel sulfate, manganese sulfate, cobalt sulfate metal salt solution of 2mol / L, the complexing agent ammonia solution of 2.8mol / L, the 2mol / L Precipitating agent Sodium carbonate solution, 1mol / L sodium dodecylsulfonate hot water solution. The complexing agent solution, deionized water, and aqueous surfactant solution were added into the reaction kettle according to a molar ratio of 1:6:1, and a total of 800ml of the solution was used as the reaction bottom liquid at zero time; the metal salt solution, 2.8mol / L complexing agent The precipitating agent sodium carbonate solution of mixture ammonia solution and 2mol / L is added in the reactor of high-speed stirring with certain speed ratio (1:1:1), and wherein sodium dodecylsulfonate mixed solution is introduced in front 12 hours, control The pH of the entire reaction system is 10±0.3, and the temperature is controlled at 58°C. After 12 hours of react...

Embodiment 3

[0063] The difference between this embodiment and Example 1 is that the precipitation agent is a mixture of sodium hydroxide and potassium hydroxide, and the molar ratio of the two is 1:1; the lithium source is a mixture of lithium hydroxide, lithium nitrate and lithium sulfate, and hydrogen The molar ratio of lithium oxide, lithium nitrate and lithium sulfate is 1:1:2.

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Abstract

The invention discloses a ternary precursor material with an internally dense and externally loose structure primary particle bulk density, an anode material and a preparation method thereof. The particle of the ternary precursor material has an internally dense and externally loose structure bulk density. The ternary precursor material is NixCoyMn2M1-x-y-z(OH)2 or NixCoyMnzM1-x-y-zCO3, x is greater than 0 and smaller than 1, y is greater than 0 and smaller than 1, z is greater than 0 and smaller than 1, x+y+z is smaller than or equal to 1, M is one or more of Zr, Fe, Sm, Pr, Nb, Ga, Zn, Y, Mg, Al, Cr, Ca, Na, Ti, Cu, K, Sr, Mo, Ba, Ce, Sn, Sb, La and Bi. According to the invention, based on comprehensive consideration of the tap density and rate performance changing situation, the introduction position and concentration of a surfactant are designed, and the accumulation compactness of particles from the inside to the outside at all parts is regulated, thus finally realizing development of the optimal overall performance of the material. The materials prepared by the method provided by the invention have the characteristics of excellent post-sintering rate and cycle performance, and high tap density.

Description

technical field [0001] The invention relates to a ternary precursor material for a lithium ion battery and a preparation method, as well as a positive electrode material prepared from the material and a preparation method. Background technique [0002] Lithium-ion batteries were commercialized in the 1990s and became the most important and widely used secondary batteries. Compared with traditional lead-acid batteries and nickel-based batteries, lithium-ion batteries have the advantages of high energy density (about 100-150Wh / kg), long cycle life, good environmental compatibility, and light weight. As a convenient energy source, lithium-ion batteries are widely used in a variety of portable electronic products, and have greatly promoted the development of industrial society including electronic technology. It is also one of the most promising candidates for energy sources for electric vehicles (EV) and hybrid electric vehicles (HEV). In the current lithium-ion battery techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 杜春雨闫春秋尹鸽平高云智左朋建程新群马玉林
Owner HARBIN INST OF TECH