Preparation method of high-capacity ternary positive electrode material and battery

A positive electrode material and high-capacity technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high residual lithium on the surface, poor batch quality, slow development and research, etc., and achieve uniform secondary particle size, low Effects of residual lithium, pH value, and excellent cycle performance

Inactive Publication Date: 2018-04-27
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the technology of NCA is in the hands of a few foreign companies. The development and research of NCA in China is a bit slow, the overall batch quality of the material is poor, the cycle performance needs to be improved, and the high residual lithium on the surface leads to serious battery gas problems.

Method used

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  • Preparation method of high-capacity ternary positive electrode material and battery
  • Preparation method of high-capacity ternary positive electrode material and battery
  • Preparation method of high-capacity ternary positive electrode material and battery

Examples

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Embodiment 1

[0041] A method for preparing a high-capacity ternary positive electrode material, comprising the following steps:

[0042] 1) NiSO 4 、CoSO 4 and NaAlO 2 Mole ratio to Ni 2+ :Co 2+ :Al 3+ = 0.815:0.15:0.035 ratio mixed, dissolved in pure water, and configured as a metal ion solution with a total concentration of 2mol / L. The above-mentioned metal ion solution and 4mol / L sodium hydroxide solution are simultaneously injected into the reaction kettle with 4mol / L ammonia water as the bottom liquid through a peristaltic pump, and the pH of the reaction is controlled to be 10-12 and the temperature is 30-60°C; After filtering and washing, drying under vacuum at 120 °C to obtain the nickel cobalt aluminum hydroxide precursor Ni 0.815 co 0.15 Al 0.035 (OH) 2 ; Mix 640.11g nickel-cobalt-aluminum hydroxide precursor with 300g lithium hydroxide in a high-speed mixer for 15min, then mix the resulting mixture in an oxygen flow rate of 18m 3 After calcination at 750°C for 15 hours ...

Embodiment 2

[0051] A method for preparing a high-capacity ternary positive electrode material, comprising the following steps:

[0052] 1) NiSO 4 、CoSO 4 and NaAlO 2 Mole ratio to Ni 2+ :Co 2+ :Al 3+ =0.88:0.09:0.03 ratio mixed, dissolved with pure water, configured as a metal ion solution with a total concentration of 2mol / L, the above-mentioned metal ion solution and 4mol / L sodium hydroxide solution were injected into the solution at a rate of 4mol / L by a peristaltic pump simultaneously. In the reaction kettle with L ammonia water as the bottom liquid, the pH of the reaction is controlled to be 10-12, and the temperature is 30-60°C. After filtering and washing, dry under vacuum at 120°C to obtain the hydroxide precursor Ni 0.88 co 0.09 Al 0.03 (OH) 2 ; Mix 645.81g nickel-cobalt-aluminum hydroxide precursor with 300g lithium hydroxide in a high-speed mixer for 15min, and then mix the mixture at an oxygen flow rate of 18m 3 Calcined at 740°C for 15 hours in a muffle furnace per h...

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Abstract

The invention discloses a preparation method of a high-capacity ternary positive electrode material. The method comprises the steps of carrying out dry mixing on nickel, cobalt and aluminum hydroxideand a lithium salt and then carrying out primary sintering; washing a product of primary sintering by using pure water, drying the product and carrying out solid-phase mixing on the product and nano metal oxide; and carrying out secondary calcining and then preparing a high-capacity ternary LiNi0.8Co0.15Al0.05O2 positive electrode material of primary spherical particles. When the LiNi0.8Co0.15Al0.05O2 positive electrode material prepared by adopting the preparation method is applied to a button battery at 4.3V and 0.1C, the gram volume can reach 200mAh g<-1>, the capacity retention ratio after100 cycles at the rate of 1C is higher than 96% and the amount of residual alkali on the surface is lower than 0.3wt.% and the pH is smaller than 11.7.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a high-capacity ternary positive electrode material and a battery. Background technique [0002] Layered LiNiO 2 The theoretical capacity is 275mAh / g, the actual capacity is 180-200mAh / g, and the average working voltage is 3.6V. It has the characteristics of low self-discharge rate, low pollution and good compatibility with various electrolytes. However, there are difficulties in preparation , the problem of poor reproducibility of the material. High-nickel cathode materials have not been widely used, the reason is that it is difficult to synthesize materials with stoichiometric ratio, the phase change in the charging and discharging process and Ni 2+ Occupy Li + The 3a position leads to cation mixing, which leads to a sharp drop in battery performance. Formation of nickel-cobalt lithium aluminate LiNi by moderate aluminum and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈德贤吴建华范江马真万国江
Owner JIANGMEN KANHOO IND
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