Slurry preparation, electrolytic

Negative and positive electrode materials, electrolytes, and separators are four key components for lithium-ion batteries. However, other auxiliary materials such as electronic conductive agents, binders, solvents for slurry preparation, positive thermal coefficient (PTC) materials, current collectors, and cases are also important in the production of complete lithium-ion batteries. 

Nd2Ni04+5 powder was prepared by nitrate-citrate route as described by Courty, et a1. (1973). Stoichiometric amounts of neodymium and nickel oxides were dissolved in diluted nitric acid. After addition of a large excess of citric acid, the solution was dehydrated and heated until self-combustion of the precipitate to obtain submicronic precursor particles (Boehm, 2005). The final annealing was performed at 1000°C for 12 hours to obtain a single crystalline phase. The particles were then ball milled to obtain an average grain size (d0 5) of about 0.8 pm. A terpineol-based slurry was prepared from this powder and this was deposited on the electrolyte by screen printing and then sintered at 1100°C for three hours in air (Lalanne, 2008). 

A solution of 0.26 g. of electrolytic Cr (preparation on p. 1335) in 2.5 ml. of 1 1 HCl is prepared. After the Hs evolution ceases, the solution is diluted with 20 ml. of water, and 2.35 g. of 2,2-dipyrldyl, dissolved in some methanol, is added. The solution, now a deep wine-red, is filtered through a fine frltted-glass filter. The filtrate is treated with a solution of 1 g. of NaClO and 0.5 ml. of 70% HCIO4 in 50 ml. of water. A slurry of black-violet crystals is formed at once. This is filtered on fine fritted glass, washed with water, alcohol and ether, and dried in vacuum over P3O5. Yield 3 g. (83% of theory). 

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