Cathode material, preparation method for cathode material, and secondary battery
AssigneeShenzhen Dynanonic Co., Ltd.
InventorsLingyong Kong, Rongyi Xu, Ze Feng, Yineng Li, Jie Tang, Peng Wang
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Abstract
A cathode material, a preparation method and an application thereof are provided. A general chemical formula of the cathode material is LiaFebMncMx(PO4)d, where 0.990≤a≤1.1, 0.9≤b+c≤1.1, 0.95≤d≤1.1, 0.001≤x≤0.03, and 0.9≤b+c+x≤1.1. A crystal of the cathode material is able to grow preferentially along an ac crystal plane. A ratio of an a-direction size of the cathode material to a b-direction size of the cathode material is 0.4542 to 0.4756, and a ratio of a c-direction size of the cathode material to the b-direction size of the cathode material is 0.5869 to 0.6172.
Claims20
A cathode material, wherein a general chemical formula of the cathode material is LiaFebMncMx(PO4)d, M comprises at least one element of Ti, V, Mg, Zr, Co, In, Ni, or Nb, and 0.990≤a≤1.1, 0.9≤b+c≤1.1, 0.95≤d≤1.1, 0.001≤x≤0.03, 0.9≤b+c+x≤1.1;
- and
- a crystal of the cathode material is able to grow preferentially along an ac crystal plane, a ratio of an a-direction size of the cathode material to a b-direction size of the cathode material is 0.4542 to 0.4756, and a ratio of a c-direction size of the cathode material to the b-direction size of the cathode material is 0.5869 to 0.6172.
A preparation method for a cathode material, wherein the preparation method for the cathode material comprises:
- dissolving a lithium source, an iron source, and a manganese source in a solvent to obtain a first slurry;
- dissolving a phosphate source and a dopant in a solvent to obtain a second slurry;
- mixing the second slurry and the first slurry to obtain a mixed slurry;
- heating the mixed slurry to obtain a precursor;
- and
- sintering and grinding the precursor to obtain the cathode material.
A secondary battery, comprising an anode plate, a separator, and a cathode plate comprising a cathode material, wherein
- a general chemical formula of the cathode material is LiaFebMncMx(PO4), M comprises at least one element of Ti, V, Mg, Zr, Co, In, Ni, or Nb, and 0.990≤a≤1.1, 0.9≤b+c≤1.1, 0.95≤d≤1.1, 0.001≤x≤0.03, 0.9≤b+c+x≤1.1;
- and
- a crystal of the cathode material is able to grow preferentially along an ac crystal plane, a ratio of an a-direction size of the cathode material to a b-direction size of the cathode material is 0.4542 to 0.4756, and a ratio of a c-direction size of the cathode material to the b-direction size of the cathode material is 0.5869 to 0.6172.
Dependencies are inferred from the claim text.