Methods for preparing particles precursor, and particle precursor prepared thereby
AssigneeMicrovast Advanced Materials Inc.
InventorsBryan Yonemoto, Xiao Zhang
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Abstract
The present disclosure provides a method for preparing full-gradient particle precursors, and the full-gradient particle precursor prepared thereby. By controlling different types of anion compositions and/or cation compositions gradually changed to other types, and adjusting the pH to match with the species, precipitated particles are deposited to form a slurry, collecting the precipitated particle, treating with water, and drying to yield the particle precursor. After being washed and dried, the particle precursor is further mixed with lithium source, after calcining to yield cathode active particles. The cathode active particles can be used to prepare cathode of lithium-ion battery.
Claims20
A method for preparing a full-gradient particle precursor, comprising the following steps:
- from an initial time t0 to a first time t1, feeding stream (b) into a reactor for providing anion(s), feeding stream (a) for providing cation(s), whereby the anion(s) and the cation(s) reacting to form a precipitated particle slurry;
- the stream (a) comprises at least a first cation composition A1, the stream (b) comprises at least a first anion composition B1 and a second anion composition B2, which is different from the first anion composition B1, the first anion composition B1 is gradually switched to the second anion composition B2 from the initial time t0 to the first time t1, t1 comes after t0, t0=0;
- filtering precipitated particle slurry to obtain a precipitated particle, and drying the precipitated particle to yield the full-gradient particle precursor;
- the anion(s) provided by the stream (b) is at least one selected from the group consisting of NaOH, Na2CO3, NaHCO3, Na2C2O4, LiOH, Li2CO3, LiHCO3, Li2C2O4, KOH, K2CO3, KHCO3, and K2C2O4,
- the cation(s) provided by the stream (a) is at least one selected from the group consisting of Mg, Ca, Zr, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Al, in a form of sulfate, carbonate, chloride, nitrate, fluoride, oxide, hydroxide, oxyhydroxide, oxalate, carboxylate, acetate, phosphate or borate.
Dependencies are inferred from the claim text.