Author ：Iflowpower – Portable Power Station Supplier
With the advancement of the times, the lithium battery has achieved rapid development. Compared with traditional batteries, the three-dimensional lithium battery has the advantage of high energy density, long cycle life, stable working voltage, small discharge, and environmentally friendly, and the positive material is the core of the three-yuan lithium battery. So what is the preparation method and development status of the three-dimensional lithium battery positive material? Xiaobian tells everyone today.
The positive material of the three-dimensional lithium battery is favored by researchers due to its high energy density, low cost, long production method, simple preparation method, small toxicity and environmentally friendly. The ternary material concentrates the advantages of Ni, Co, Mn elements, wherein the Ni atom can significantly increase the capacity of the material, and the addition of CO can increase the charge and discharge stability of the material, the Mn does not participate in the reaction, and the stability of the material can be improved. safety.
However, since the Ni atomic radius is similar to the radius of the lithium ion, the cationic mixing phenomenon is easily caused during charge and discharge, so that the irreversible embedding of lithium ions occur, affecting its circulating stability, inhibiting further improvement of electrochemical properties. Preparation method of three-dimensional lithium battery positive electrode material The main preparation method of the positive electrode material of the three-yuan lithium battery is generally divided into solid phase method and solution method. Solid phase method with high temperature solid phase method and acetate combustion method.
The solution method mainly includes sol-gel method, total precipitation method, spray heat solution, etc. Different synthetic methods have a great impact on the performance of the prepared ternary materials. Next, readers will briefly introduce several common preparation methods: 1, sol-gel method sol-gel method is a advanced soft chemical method for synthesizing ultrafine particles.
Widely used in synthesizing various ceramic powders, coatings, films, fibers, and more. The method is to mix the predecessor of the lower viscosity, make uniform sol, and make the gel, after the gel or the gel process, dry, then sintered or calcined. 2, the common precipitation method is generally mixed with a chemical raw material in a solution state, and the appropriate precipitant is added to the solution, allowing each component that has been mixed in the solution to precipitate in a solution, or in solution Prevent one intermediate product is precipitated, and then calcined it to decompose the product of a fine powder.
Conventional solid phase synthesis techniques are difficult to reach the material or atomic stoichiometric ratio mixing, while using a coprecipitation method can often solve this problem, thereby achieving lower production costs for the purpose of preparing high quality materials. 3, high temperature solid phase method high temperature solid phase, the reactant is only solid phase reaction, is a method for synthetic powder materials, and is also a common method of preparing a positive electrode material. In order to make the synthetic material ideal electrochemical properties, meet the stability of the Li + demy structure, there must be a good crystallinity.
Therefore, in the high temperature solid phase, the reactant is only solid phase reaction, and is a method for synthetic powder materials, and is also a common method of preparing a positive electrode material. 4, hydrothermal water heat synthesis technology refers to a method of chemical synthesis in a high temperature and high pressure over saturated aqueous solution. It belongs to a kind of moisture chemical synthesis.
The powder synthesized by hydrothermal method is generally crystallinity, and any crystalline water may be not contained by optimizing synthesis conditions, and the size, uniformity, shape, and ingredient of the powder can be strictly controlled. Water heat synthesis omits the calcination step, thereby also omitting the step of grinding, so the purity of the powder is high, the density of the crystal defect is lowered. The development of three-dimensional lithium battery positive electrode material has developed rapidly in the development of lithium multi-element transition metal composite positive electrode materials in recent years, especially a new transition metal-in-chithoxium oxide composite material containing three elements of cobalt nickel manganese.
Due to more and more Chinese companies participate in international market competition, the material choice of international lithium-e-commerce directly affects the choice of domestic enterprises. Such materials have integrated lithium cobaltate, lithium nickellate and lithium manganganate, forming a heurct system of LiiCoO2 / LiniO2 / LiMnO2 three-phase, and its comprehensive performance is better than any single-combined compound, existence Obvious ternary synergies. Such solid solution materials typically have a discharge capacity of about 200 mAh / g, between 2.
5 to 4.6V, during charge and discharge, can maintain the characteristics of the layered structure, to avoid layered LiMnO2 structure to spinel Structure transformation. Compared with the mainstream of the market, there is a wide range of capacity, low price, low price, high thermal stability and good safety, have broad market prospects.
The future development will be insequential in terms of innovation, morphological control, surface modification, and improved vibration density in the preparation method. The positive material of the three-dimensional lithium battery is the most critical raw material in the lithium battery. Since the positive electrode material occupies a large proportion in the lithium battery, it determines the safety performance of the battery and the battery energy can be large, and due to the lithium ion battery positive material The proportion of battery cost can be as high as about 40%, so the cost is directly determined that the battery cost is high.
It should be said that the development of the three-dimensional lithium battery positive material is leading the development of lithium batteries.
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