Synthesis method of ball-shaped mixed with/nickelnous hydroxide and multielement metal oxide and battery

Abstract

A process for preparing the doped spherical nickelous hydroxide includes such steps as mixing 2-valence Ni salt and Co salt with ammonia water and ammoniunm salt to obtain complex solution, adding it along with the mixed solution of metallic salt and alkali solution into reactor, reaction while stirring, and washing the deposit. The resultant doped spherical nickelous hydroxide can be used to prepare the multi-element metallic oxide, which can be used to prepare the active positive electrode of Li-ion battery.

Description

【Technical field】 [0001] The invention belongs to the field of high-energy electrochemistry, and specifically relates to a synthesis method of spherical doped nickel hydroxide and multiple metal oxides and a lithium ion battery. 【Background technique】 [0002] At present, lithium-ion batteries are widely used in electronic devices such as mobile phones, laptop computers, and portable audio-visual equipment, but the positive electrode material lithium cobalt oxide (LiCoO 2 ) but the price keeps rising due to resource problems, which limits the development of lithium-ion batteries. Therefore, continuous efforts have been made to find suitable alternative materials. Composite cathode materials such as cobalt-nickel-manganese have been studied most recently. The most commonly used method reported in the literature is the co-precipitation method. In this method, the metal salt is made into a solution in a certain proportion, and additives such as ammonia water are added to con...

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Problems solved by technology

But the disadvantage of this method is: when the salt solution is added to the base solution, ammonia (NH 3 ) and OH - At the same time, there is contact with metal ions, and competition occurs, due to OH - than NH 3 easier to talk to you 2+ 、Co 2+ Plasma reaction, ammonia (NH 3 ) is difficult to play the role of controlling crystallization, the microstructure of intermediate particles is irregular, and the size distribution is relatively wide

Research by Wu Guoliang and others showed that the particle size distribution of the material has a significant impact on the discharge capacity, especially the charge-discharge cycle performance. The wider the particle size distribution, the worse the cycle performance, because when the particle size distribution is wider, its porosity is poor, which affects Its capillary action on the electrolyte makes the impedance larger. When charged to the limit potential, the Li on the surface of the large particles + It will destroy its hierarchical structure due to excessive de-embedding, so it is not conducive to cycle performance

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