Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material and preparation method thereof

Abstract

The invention relates to a cathode material of a lithium ion battery and preparation of the cathode material, in particular to a Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material and a preparation method thereof. The Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material is prepared from the following raw materials: a ternary precursor Ni0.5Co0.2Mn0.3(OH)2, Li2CO3, Sr(OH)2.8H2O and H3BO3, wherein the stoichiometric ratio of the ternary precursor Ni0.5Co0.2Mn0.3(OH)2 to the Li2CO3 is m(Li<+>) / m(Ni<2+>+Co<2+>+Mn<2+>) which is equal to 1.04 to 1; the Sr doping content is 0.06 to 0.18 percent by mass; the H3BO3 doping content is 0.5 to 1.2 percent by mass; all the raw materials are prepared into the cathode material through high temperature solid phase sintering. Compared with a conventional ternary cathode material, the cathode material prepared through the preparation method is higher in compaction density, and the specific energy density is substantially increased, so that the full battery performance is effectively improved.

Description

technical field [0001] The invention relates to positive electrode materials and preparations of lithium ion batteries, specifically a kind of doped Sr and H 3 BO 3 LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material and preparation method thereof. Background technique [0002] Traditional LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary cathode material has the characteristics of low price, high discharge specific capacity, and stable cycle, but the common 523 ternary cathode material has the disadvantages of low capacity retention rate and low compaction during multiple cycles, which affect the further improvement of its performance. . Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a kind of doped Sr and H that can increase the compaction density of the ternary positive electrode material and improve the performance of lithium-ion batteries. 3 BO 3 LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material and preparation meth...

AI Technical Summary

Problems solved by technology

[0002] Traditional LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary cathode material has the characteristics of low price, high discharge specific capacity, and stable cycle, but the common 523 ternary cathode material has the disadvantages of low capacity retention rate and low compaction during multiple cycles, which affect the further improvement of its performance.