High-nickel nickel-cobalt-manganese ternary single crystal material as well as preparation method and application thereof

Abstract

The invention discloses a high-nickel nickel-cobalt-manganese ternary single crystal material as well as a preparation method and application thereof. The general formula of the high-nickel nickel-cobalt-manganese ternary single crystal material is set to be LiNixCoyMnzRtO2, wherein x is more than or equal to 0.5 and less than or equal to 0.8, y is more than or equal to 0.1 and less than 0.3, z ismore than 0.1 and less than or equal to 0.2, and t is more than 0 and less than to 0.1. Sulfate ions are not introduced, so that washing water is not required. Thus, washing water does not need to beused, and pH control is not needed in a production process.

Description

technical field [0001] The invention relates to a high-nickel nickel-cobalt-manganese ternary single crystal material, a preparation method and its application, especially a high-nickel nickel-cobalt-manganese ternary single crystal material suitable for lithium batteries, a preparation method and its application . Background technique [0002] Ordinary nickel-cobalt-manganese ternary (NMC) lithium battery materials are widely used because of their low cost, high safety, and environmental friendliness, but the current nickel-cobalt-manganese ternary lithium battery materials decay quickly due to the Jahn-Teller effect The doping of various elements can partially solve the cycle performance, but it is still unable to achieve the expected goal of the society. The methods for preparing high-nickel ternary materials in the prior art include high-temperature solid-phase method, sol-gel method, and liquid-phase co-precipitation method. Among them, the liquid phase co-precipitatio...

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Problems solved by technology

The precursor is blended with lithium salt and sintered at high temperature. This process is currently very common and has been mass-produced industrially. Its limitations are that the precursor must be washed many times, and the amount of waste water is large. It may be unevenly distributed, and there is a phenomenon of segregation and agglomeration. When the secondary agglomerated spherical particles are rolled on the battery pole piece, the pressure should not be too high, otherwise the microspheres will break and cause the battery to fall off during the charging and discharging process. It causes the resistance of the pole piece to increase and the capacity to be lost. For example, the patent CN20131067528.1 discloses a preparation method of a lithium battery ternary material, such as adding deionized water into the reaction kettle, pumping various metal salt solutions, and pumping NaOH at the same time ,Ammonia solution to precisely adjust the pH value between 10---11

After aging, it is filtered and washed to obtain the nickel hydroxide cobalt manganese metal oxide precursor. After drying, it is mixed with lithium salt and sintered at high temperature. This patent or similar patents CN200910109331.8, CN20151045666.0, etc. are typical common Precipitation preparation process, in the process of precursor synthesis, the pH value must be precisely controlled, the reactor must be protected by nitrogen, a large amount of deionized water is required in the washing process, the energy consumption is high, the impact on the environment is large, and the preparation process is long. Therefore, it is necessary to use washing water and the PH value must be precisely controlled in the manufacturing process, the electrode resistance increases and the capacity loss

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