摘要：【中文】本发明属于锂离子电池正极材料技术领域，具体涉及一种核壳结构高镍三元正极材料的制备方法；它包括：制备高镍混合盐液A和低镍混合盐液B；将高镍混合盐液A、碱性溶液和络合剂泵入到反应釜内，通入惰性气体，生成高密实颗粒；将低镍混合盐液B通过计量泵通入到混合盐液A中，将AB的混合盐液泵入反应釜，在颗粒表面形成镍含量从内到外逐渐降低的过渡层；当混合盐液AB消耗完毕，将反应盐液完全切换为B盐液继续合成，形成外层低镍包覆层；反应停止后，将产物进行压滤水洗、烘干、过筛和除铁；将前驱体和锂源混合，在合适的气氛下进行烧结；本发明易于工业化生产，保留了中低镍三元材料的热稳定性和高镍材料的高比容量。 【EN】The invention belongs to the technical field of lithium ion battery anode materials, and particularly relates to a preparation method of a core-shell structure high-nickel ternary anode material; it includes: preparing a high-nickel mixed salt solution A and a low-nickel mixed salt solution B; pumping the high-nickel mixed salt solution A, an alkaline solution and a complexing agent into a reaction kettle, and introducing inert gas to generate high-density particles; introducing the low-nickel mixed salt solution B into the mixed salt solution A through a metering pump, pumping the mixed salt solution of the AB into a reaction kettle, and forming a transition layer with the nickel content gradually reduced from inside to outside on the particle surface; when the mixed salt solution AB is completely consumed, the reaction salt solution is completely switched to the salt solution B to be continuously synthesized, and an outer low-nickel coating layer is formed; after the reaction is stopped, carrying out filter pressing and washing, drying, sieving and iron removal on the product; mixing the precursor with a lithium source, and sintering in a proper atmosphere; the invention is easy for industrialized production, and retains the thermal stability of the medium-low nickel ternary material and the high specific capacity of the high nickel material.

摘要：【中文】本发明属于锂离子电池技术领域，具体涉及一种锂离子电池正极材料及其制备方法、锂离子电池。本发明的锂离子电池正极材料的制备方法包括以下步骤：(1)将三元前驱体、锂源和助剂混合均匀，然后于600～980℃温度下保温5～15h，得中间产物；所述三元前驱体的化学式为Ni_xCo_yD_(1‑x‑y)(OH)₂，其中0＜x≤1，0＜y≤1，0＜x+y＜1，D为Mn、Al元素中的一种；所述助剂为AlF₃、KF、LiF、NaCl、KCl、H₃BO₃、B₂O₃中的一种或多种；(2)将中间产物与锂源混合均匀，然后于650～980℃温度下保温5～15h，即得。根据本发明的制备方法制备的正极材料，晶型结构较好，颗粒一致性较高；作为正极活性物质用于锂离子电池时，锂离子电池具有较高的能量密度。 【EN】The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery anode material, a preparation method thereof and a lithium ion battery. The preparation method of the lithium ion battery anode material comprises the following steps: (1) uniformly mixing the ternary precursor, a lithium source and an auxiliary agent, and then carrying out heat preservation for 5-15 hours at the temperature of 600-980 ℃ to obtain an intermediate product; the chemical formula of the ternary precursor is Ni_xCo_yD_(1‑x‑y)(OH)₂Wherein x is more than 0 and less than or equal to 1, y is more than 0 and less than or equal to 1, x + y is more than 0 and less than 1, and D is one of Mn and Al elements; the auxiliary agent is AlF₃、KF、LiF、NaCl、KCl、H₃BO₃、B₂O₃One or more of; (2) and (3) uniformly mixing the intermediate product with a lithium source, and then preserving heat for 5-15 hours at the temperature of 650-980 ℃ to obtain the lithium ion battery.The positive electrode material prepared by the preparation method disclosed by the invention is good in crystal structure and high in particle consistency; when used as a positive electrode active material in a lithium ion battery, the lithium ion battery has a high energy density.

摘要：【中文】本发明涉及一种复合三元正极材料及其制备方法和锂离子电池。该复合三元正极材料的制备包括：1)将前驱体和锂源混合均匀，于500‑900℃保温5‑20h，得到预烧产物；2)将预烧产物与助剂混合均匀，于700‑1000℃保温5‑20h，得三元材料；3)将步骤2)制得的三元材料进行氧化物包覆处理，即得。本发明提供的复合三元正极材料的制备方法，先通过低温预烧形成层状结构三元材料，起到固定锂源，减少高温烧结锂损失严重的问题；再通过加入助剂烧结，起到降低烧结温度、晶体重塑的作用，制备具有高电压、单晶形貌的三元材料；最后通过氧化物包覆处理，改善材料在高电压下的界面稳定性。 【EN】The invention relates to a composite ternary cathode material, a preparation method thereof and a lithium ion battery. The preparation method of the composite ternary cathode material comprises the following steps: 1) uniformly mixing the precursor and a lithium source, and preserving the heat for 5-20h at the temperature of 500-; 2) uniformly mixing the pre-sintered product with an auxiliary agent, and carrying out heat preservation at the temperature of 700-; 3) carrying out oxide coating treatment on the ternary material prepared in the step 2). According to the preparation method of the composite ternary cathode material, the ternary material with the layered structure is formed through low-temperature pre-sintering, so that a lithium source is fixed, and the problem of serious loss of high-temperature sintered lithium is solved; then, sintering is carried out by adding an auxiliary agent, so that the effects of reducing sintering temperature and remolding crystals are achieved, and the ternary material with high voltage and single crystal morphology is prepared; and finally, the interface stability of the material under high voltage is improved through oxide coating treatment.