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A multi-element partition doped cobalt-free positive electrode material and preparation method thereof

A cathode material and multi-element technology, which is applied in the field of high-performance multi-element partition-doped cobalt-free cathode materials and their preparation, can solve problems such as uneven stress distribution, unbalanced structural strength, and easy cracking, and achieve excellent cycle performance. , avoid imbalance, good stress release effect

Active Publication Date: 2021-10-01
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing doping methods focus on the uniform doping process, and the stress distribution in the material is not uniform. Using an element doping to stabilize the bulk phase structure will easily cause structural strength imbalance during the cycle. Easy to crack, poor modification effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take NiSO 4 ·6H 2 O and MnSO 4 ·H 2 O configures 5 mol / L salt solution A; prepares 0.5 mol / L Al salt solution B; prepares 0.5 mol / L Mg salt solution as C; prepares 0.5 mol / L W salt solution as D; industrial ammonia ( 25%) is solution E; prepare 8mol / L sodium hydroxide solution as F.

[0030] (2) The solutions A, B, C, D, E, and F are continuously pumped into the reactor through their respective pipelines in parallel to react. In the first stage, A, B, E, and F solutions are flowed in parallel for reaction, so that the ammonia concentration in the tank is stabilized at 7.4 g / L, the pH is stabilized at 12.0, the temperature of the reactor is 60 ° C, and the stirring speed is 300 r / min , until the particle grows to 3 μm; in the second stage, A, C, E, F solutions are flowed in parallel to react, so that the concentration of ammonia water in the kettle is stable at 7.6 g / L, the pH is stable at 11.8, and the temperature of the reactor is 55°C , The stirring speed is ...

Embodiment 2

[0036] (1) Take NiSO 4 ·6H 2 O and MnSO 4 ·H 2 O prepares 5 mol / L salt solution A; prepares 0.5 mol / L Al salt solution as B; prepares 0.5 mol / L Mg salt solution as C; prepares 0.5 mol / L W salt solution as D; industrial ammonia water (25%) is solution E; prepare 8mol / L sodium hydroxide solution as F.

[0037] (2) Continuously pump solutions A, B, C, D, E, and F into the reaction kettle through their respective pipelines for reaction. In the first stage, A, B, E, and F solutions are flowed in parallel for reaction, so that the ammonia concentration in the tank is stabilized at 7.4 g / L, the pH is stabilized at 12.0, the temperature of the reactor is 60 ° C, and the stirring speed is 300 r / min , until the particle grows to 2 μm; in the second stage, A, C, E, F solutions are flowed in parallel to react, so that the ammonia concentration in the kettle is stable at 7.6 g / L, the pH is stable at 11.8, and the temperature of the reactor is 55 ℃ , The stirring speed is 350r / min, unt...

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Abstract

The invention provides a cobalt-free positive electrode material doped with multi-element partitions, the molecular formula of which is Li x Ni a mn b Al c Mg d W e o 2 , where 0.95≤x≤1.1, 0.5≤a≤0.9, 0.1≤b≤0.5, 0<c≤0.01, 0<d≤0.01, 0<e≤0.01, a+b=1, the positive electrode material is from the inside The outside includes an Al doped region, a Mg doped region and a W doped region in sequence; and a method for preparing the anode material is also provided. The cobalt-free positive electrode material of the present invention can better adapt to stress release by partitioning the positive electrode material doped with Al, Mg, and W elements, achieve moderate adjustment, and avoid imbalance, so that the structure of the material is more stable, and the rate performance and cycle performance are better. , the preparation method of the material has a simple process, is easy to implement, and can stably prepare a positive electrode material with excellent structure and performance.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a high-performance multi-element partition doped cobalt-free positive electrode material and a preparation method thereof. Background technique [0002] With the over-exploitation of non-renewable energy sources such as petroleum, the problems of resource shortage and environmental pollution have become more and more prominent. In order to solve the above problems, many countries in the world are vigorously developing the new energy vehicle industry to replace fuel vehicles. Lithium-ion batteries are widely used in electric vehicles as a new type of power source to reduce greenhouse gas emissions. At present, the mainstream cathode material lithium cobalt oxide (Li 2 CoO 2 ), lithium nickel cobalt manganate (NCM) and lithium nickel cobalt aluminate (NCA) are all cobalt-containing materials, but my country's cobalt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M10/0525C01G53/006C01P2006/40H01M2004/021H01M2004/028Y02E60/10H01M4/36C01G53/50C01G53/00C01G53/66C01P2004/61H01M4/8885
Inventor 张宝邓鹏程诚林可博周亚楠邓梦轩
Owner ZHUJI PAWA NEW ENERGY
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