Preparation method of ternary positive electrode material with low-pH, high-compactness and high cycle performance

Abstract

The invention relates to preparation of an electrode material of a lithium ion battery, in particular to a preparation method of a ternary positive electrode material with low-pH, high-compactness and high cycle performance. The method comprises the following steps: 1, mixing a 523 type ternary precursor with granularity D50 being 15 [mu]m level and battery grade lithium carbonate according to a ratio of Li to M being equal to 0.49 to 0.52, and sintering; 2, mixing lithium carbonate with the same weight as in the step 1 and an intermediate 1, and sintering; 3, repeating the step 1 and the step 2 by using a 523 type ternary precursor with granularity D50 being 5 [mu]m level to obtain an intermediate 3, and mixing an intermediate 2 and the intermediate 3 to obtain an intermediate 4; and 4, after porphyrizing P2O5, mixing P2O5 and the intermediate 4 and sintering uniformly, and cooling and crushing to prepare a finished product. The preparation method is simple in process and suitable for large-scale industrial production, and the ternary positive electrode material has low pH, high compactness and high cycle performance.

Description

technical field [0001] The invention relates to the preparation of lithium ion battery electrode materials, in particular to a preparation method of a ternary positive electrode material with low pH, high compaction and high cycle performance. Background technique [0002] At present, the most mature cathode material for lithium-ion batteries on the market is LiCoO 2 , has the characteristics of high compaction and good processing performance, but its price is expensive, and there is little room for further improvement of performance; while 523 type 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 during multiple cycles, difficult pH control, and low compaction, which affect its performance. Further performance improvements. Contents of the invention [0003] The purpose of the...

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Problems solved by technology

[0002] At present, the most mature cathode material for lithium-ion batteries on the market is LiCoO 2 , has the characteristics of high compaction and good processing performance, but its price is expensive, and there is little room for further improvement of performance; while 523 type 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 during multiple cycles, difficult pH control, and low compaction, which affect its performance. Further performance improvements

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