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A kind of single crystal high-nickel positive electrode material and its preparation method and application

A positive electrode material, high nickel technology, applied in the field of single crystal high nickel positive electrode material and its preparation, can solve the problems of lower residual alkali content and pH value, lower battery capacity, poor battery performance, etc., to reduce gas production and increase rate performance, the effect of improving cycle performance

Active Publication Date: 2021-08-06
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The significant reduction in the amount of residual alkali and the pH value of the modified low-residual alkali-type high-nickel ternary positive electrode material can not only prevent side reactions caused by direct contact between residual alkali and electrolyte, but also make the modified The low residual alkali type high-nickel ternary positive electrode material has high ionic conductivity between the reaction interface of the electrolyte, thereby reducing impedance, but the capacity of the battery made of the positive electrode material is low, and the battery performance is poor
[0006] The above scheme has the problem of high residual alkali or reduced battery capacity. Therefore, it is necessary to develop a single crystal high-nickel cathode material with low residual alkali and maintain battery capacity.

Method used

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  • A kind of single crystal high-nickel positive electrode material and its preparation method and application
  • A kind of single crystal high-nickel positive electrode material and its preparation method and application
  • A kind of single crystal high-nickel positive electrode material and its preparation method and application

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Embodiment 1

[0050] This embodiment provides a single crystal high nickel positive electrode material, the preparation method of the single crystal high nickel positive electrode material is as follows:

[0051] (1) Take Ni 0.83 co 0.11 mn 0.06 (OH) 2 and lithium hydroxide, according to lithium / metal = 1.03:1, weighed into the high-speed mixing equipment, and then added 0.1% nano-zirconia, mixed at 1000rpm for 20min, at an oxygen flow rate of 10 L / min, at 3 ℃ / min The heating rate is raised to 850°C, sintered for 10 hours, cooled to room temperature, crushed and passed through a 300-mesh sieve to obtain a first-fired material;

[0052] (2) Mix the one-fired material obtained in step (1) with titanium oxide and cobalt tetroxide at a mass ratio of 1:0.003:0.008, and heat up to 800°C at an oxygen flow rate of 10 L / min at a heating rate of 3°C / min. Sintering for 15 hours, cooling to room temperature, crushing, and passing through a 300-mesh sieve to obtain the single-crystal high-nickel ...

Embodiment 2

[0056] This embodiment provides a single crystal high nickel positive electrode material, the preparation method of the single crystal high nickel positive electrode material is as follows:

[0057] (1) Take Ni 0.8 co 0.1 mn 0.1 (OH) 2 and lithium hydroxide, according to the lithium / metal ratio of 1:1, add it into the high-speed mixing equipment, then add 0.15% nano-tungsten oxide and mix it at 1500rpm for 20min, with the oxygen flow rate at 12 L / min and the temperature rising at 4°C / min Raise the temperature to 900°C, sinter for 8 hours, cool to room temperature, crush and pass through a 400-mesh sieve to obtain a sintered material;

[0058] (2) Mix the one-fired material obtained in step (1) with titanium hydroxide and cobalt chloride at a mass ratio of 1:0.005:0.012, and heat up to Sintering at 750° C. for 12 hours, cooling to room temperature, crushing, and passing through a 400-mesh sieve to obtain the single-crystal high-nickel positive electrode material.

Embodiment 3

[0060] The only difference between this embodiment and embodiment 1 is that the sintering temperature in step (1) is 800° C., and other conditions and parameters are exactly the same as those in embodiment 1.

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Abstract

The invention provides a single-crystal high-nickel cathode material and its preparation method and application. The preparation method includes the following steps: (1) Mix the precursor, lithium source and nano-oxide, and perform sintering once in an oxygen-containing atmosphere. Process to obtain a first-fired material; (2) Mix the first-fired material obtained in step (1) with a titanium source and a cobalt source, and undergo a secondary sintering treatment in an oxygen-containing atmosphere to obtain the single-crystal high-nickel cathode material. The invention adopts the Ti / Co co-coating method, which can greatly reduce the amount of residual alkali in the single-crystal high-nickel cathode material. At the same time, the capacity and rate performance are also maintained at a high level, thereby reducing the process flow and reducing the cost.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries and relates to a single crystal high nickel positive electrode material and its preparation method and application. Background technique [0002] When synthesizing high-nickel ternary lithium nickel cobalt manganate (NCM) cathode material or lithium nickel cobalt aluminate (NCA) cathode material, the residual alkali content on the surface of the material is high and it is easy to absorb water. On the one hand, the subsequent coating of the cathode material This creates difficulties and puts forward higher requirements for the electrolyte in terms of alkali resistance. High alkalinity will cause the battery to bloat during the cycle, thereby affecting the cycle performance of the battery; on the other hand, in the charging state, due to the positive electrode material particles Ni exists on the surface 4+ ,Ni 4+ It has high activity and is prone to side reactions with the electrolyte, thereby...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00C30B1/10C30B29/22
CPCH01M4/525H01M4/505H01M10/0525C01G53/44C30B29/22C30B1/10H01M2004/028C01P2004/03C01P2006/40Y02E60/10
Inventor 马加力张树涛李子郯王壮王亚州白艳潘海龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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