Low-Cost Method for Making Lithium Transition Metal Olivines with High Energy Density
申请人:DOW GLOBAL TECHNOLOGIES LLC
公开号:US20150349343A1
公开(公告)日:2015-12-03
An inexpensive method for making lithium transition metal olivine particles that have high specific capacities is disclosed. The method includes the steps of: a) combining precursor materials including at least one source of lithium ions, at least one source of transition metal ions, at least one source of H
x
P0
4
ions where x is 0-2 and at least one source of carbonate, hydrogen carbonate, formate and/or acetate ions in a mixture of water and a liquid cosolvent which is miscible with water at the relative proportions of water and cosolvent that are present and which liquid cosolvent has a boiling temperature of at least 130° C.; wherein the mole ratio of lithium ions to H
x
P0
4
ions is from 0.9:1 to 1.2:1, and a lithium transition metal phosphate and at least one of carbonic acid, formic acid or acetic acid are formed, b) heating the resulting mixture at a temperature of up to 120° C. to selectively remove the carbonic acid, formic acid, acetic acid and/or carbon-containing decomposition products thereof from the reaction mixture, optionally remove some or all of the water from the reaction mixture and produce lithium transition metal olivine particles, and then c) separating the lithium transition metal olivine particles from the liquid cosolvent.
本发明公开了一种制备高比容量的锂过渡金属橄榄石颗粒的廉价方法。该方法包括以下步骤:a)将包括至少一种锂离子源,至少一种过渡金属离子源,至少一种HxP04离子源(其中x为0-2),以及至少一种碳酸盐,氢碳酸盐,甲酸盐和/或乙酸盐离子的前体材料在水和一种液态共溶剂的混合物中结合,该液态共溶剂与水的相对比例存在,且该液态共溶剂的沸点至少为130℃;其中锂离子与HxP04离子的摩尔比为0.9:1至1.2:1,形成锂过渡金属磷酸盐和至少一种碳酸酸、甲酸或乙酸。b)将所得混合物加热至不超过120℃的温度,选择性地从反应混合物中去除碳酸酸、甲酸、乙酸和/或含碳分解产物,可选地从反应混合物中去除部分或全部水,并产生锂过渡金属橄榄石颗粒,然后c)将锂过渡金属橄榄石颗粒从液态共溶剂中分离出来。