摘要:
It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density and high safety, is excellent in uniform coating properties and is excellent in the charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula LipQqNxMyOzFa (wherein Q is at least one element selected from the group consisting of titanium, zirconium, niobium and tantalum, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the Q element and the N element, 0.9≦p≦1.1, 0
摘要翻译:本发明提供一种具有容量密度大,安全性高的锂二次电池用正极活性物质,均匀涂布性能优异,即使在高温下也具有优异的充放电循环耐久性和低温特性 充电电压。 一种由下式表示的含锂复合氧化物的制备方法:其中R 1,R 2,R 2,R 3, (其中Q是选自钛,锆,铌和钽中的至少一种元素,N是选自下组中的至少一种元素:其中Q是选自钛,锆,铌和钽中的至少一种元素, 由Co,Mn和Ni组成,M是选自Al,碱土金属元素和Q元素和N元素以外的过渡金属元素中的至少一种元素,0.9 <= p <= 1.1,0 < 来自锂源的q <= 0.03,0.97 <= x <1.00,0 <= y <0.03,1.9 <= z <= 2.1,q + x + y = 1和0 <= a <= 0.02) 元素源和N元素源,并且如果需要,选自由M元素源和氟源组成的组中的至少一种源,其特征在于将作为Q元素源的Q元素化合物水溶液用作pH值为 0.5至11。
摘要:
Fine particulate silica gel having the following characteristics (1) to (3): (1) average particle size: from 1 to 200 &mgr;m; (2) oil absorption in accordance with JIS K5101: from 100 to 300 ml/100 g; and (3) hygroscopicity represented by moisture adsorption under a relative humidity of 90% at 25° C. in accordance with JIS Z0701: not more than 20 wt %.
摘要:
A process for preparing hydrogen fluoride, which comprises (i) reacting calcium fluoride with sulfuric acid to produce a gypsum and a gas containing hydrogen fluoride, (ii) separating hydrogen fluoride from said gas containing hydrogen fluoride, (iii) absorbing said hydrogen fluoride-separated gas with water to obtain an aqueous solution containing hydrogen fluoride and silicofluoric acid, (iv) reacting calcium carbonate with said aqueous solution to obtain a suspension containing silicic acid and calcium fluoride, (v) adding an alkaline substance to said suspension to make pH at least 8, thereby stabilizing the silicic acid as a colloidal solution, (vi) separating a calcium fluoride solid and the colloidal solution of silicic acid from said suspension, and (vii) recycling the separated calcium fluoride as a starting calcium fluoride.
摘要:
A method for treating a waste gas containing a fluorine component and/or a chlorine component, which comprises contacting the waste gas with magnesium oxide particles having a specific surface area of from 100 to 200 m.sup.2 /g.