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Lithium-ion battery, multi-element positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of multi-element lithium-ion battery positive electrode materials and its preparation, can solve the problem of insufficient bonding of coating elements and material surfaces, affecting high-voltage and high-temperature performance of materials, and crystallization damage on the surface of ternary materials and other problems, to achieve the effects of reducing Li/Ni mixing, improving electrical conductivity, and superior high-voltage and high-temperature performance

Active Publication Date: 2017-05-24
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating solvent will cause great damage to the surface crystallization of the ternary material, which seriously affects the high voltage and high temperature properties of the material
However, the solid oxide fire sintering process is used to coat the surface of ternary materials, and there are problems of insufficient bonding and poor uniformity between the coating elements and the surface of the material, so it is difficult to achieve the desired effect with this single technology; in addition, if The fire coating process is carried out in the precursor stage, and the addition of coating elements during the activation process of the lithium source will affect the diffusion of lithium elements into the material body, reducing the gram capacity of the material.

Method used

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  • Lithium-ion battery, multi-element positive electrode material and preparation method thereof
  • Lithium-ion battery, multi-element positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of nickel-cobalt-manganese hydroxide precursor: use pure water as the bottom liquid, raise the temperature to 60°C-75°C, control the stirring speed at 160r / min-180r / min, add ammonia water to adjust the pH value of the bottom liquid to 10.3 About; the nickel-cobalt-manganese mixed salt solution with a total ion concentration of 60g / L, the sodium hydroxide solution with a concentration of 30wt.%, and the ammonia water with a concentration of 18vol.% are continuously pumped into the bottom liquid in parallel, and the nickel salt is nickel sulfate , the cobalt salt is cobalt sulfate, the manganese salt is manganese sulfate, and the obtained reaction solution is configured; precipitation reaction occurs at 60°C to 75°C, and the solid content of the slurry in the reaction system is controlled to be 260g / L to 300g / L, and kept The above alkalinity and pH value, the reaction feed liquid continuously flows out from the upper overflow port of the reaction kettle and...

Embodiment 2

[0039] Different from Example 1, in step (2) nickel-cobalt-manganese hydroxide is carried out Ti surface doping treatment, Ti surface doping amount is 0.5mol%, modification temperature / time is 500 DEG C / 5h, step (4 ) The treatment temperature / time in the surface Mg treatment of nickel-cobalt-manganese ternary material B is 850°C / 5h, step (5) nickel-cobalt-manganese ternary material Al 2 o 3 The treatment temperature / time in the coating treatment is 500°C / 5h; other raw materials, steps and parameters are the same as in Example 1. The molecular formula of the modified ternary material D is Li 1.05 Ni 0.495 co 0.195 mn 0.295 Ti 0.005 Mg 0.005 al 0.005 o 2 (I CP measurement), the thickness of the magnesium-containing transition layer is 0.8-1.5 μm.

Embodiment 3

[0041] The difference from Example 1 is that in step (2) nickel-cobalt-manganese hydroxide is subjected to Ti surface doping treatment, the Ti surface doping amount is 2mol%, the modification temperature / time is 500°C / 5h, step (4) In the surface Mg treatment of nickel-cobalt-manganese ternary material B, the Mg modification treatment temperature / time is 800°C / 5h, step (5) nickel-cobalt-manganese ternary material Al 2 o 3 The treatment temperature / time in the coating treatment is 500°C / 5h; other raw materials, steps and parameters are the same as in Example 1. The theoretical chemical formula of material D is Li 1.05 Ni 0.485 co 0.19 mn 0.295 Ti 0.02 Mg 0.005 al 0.005 o 2 (ICP test analysis), the thickness of the magnesium-containing transition layer is 0.6-1.3 μm.

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Abstract

The invention discloses a lithium ion battery and a multi-element positive material thereof as well as a preparation method for the multi-element positive material. The chemical general formula of the multi-element positive material is LixNiaCobMncNyO2, wherein N is one of Ti, Mg and Al; x is more than or equal to 1.0 and less than or equal to 1.15; a is more than 0 and less than 1; b is more than 0 and less than 1; c is more than 0 and less than 1; y is more than or equal to 0.003 and less than or equal to 0.07; the sum of a, b, c and y is equal to 1. The multi-element positive material with a layered structure comprises a kernel pure phase layer containing lithium cobalt nickel manganese oxide, a surface doped layer containing a doped element Ti, an oxide surface cladding layer containing a cladding element Al and a shallow surface doped transitional layer which is positioned between the surface doped layer and the surface cladding layer and contains a doped element Mg. The preparation method of the multi-element positive material comprises the steps of synthesizing a multi-element precursor of which a body phase contains nickel, cobalt and manganese, then performing Ti doping and lithium treatment on the surface of a precursor liquid phase, and finally, doping Mg on the surface by a pyrogenic process and performing Al2O3 cladding treatment to obtain the composite modified multi-element lithium ion positive material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries. More specifically, the invention relates to a multi-element lithium ion battery cathode material suitable for high-voltage charging and discharging and a preparation method thereof. Background technique [0002] Ternary cathode material Li x Ni a co b mn c o 2 Since its discovery, because of its high capacity (up to 250mAh / g, which is 91% of the theoretical capacity), excellent safety performance and low price, it has received extensive attention and research, and has been widely used. [0003] The study found that due to the similar radii of nickel ions and lithium ions, Li / Ni mixing is prone to occur, resulting in a decrease in the Coulombic efficiency of the material and the dissolution of transition metals during cycling. This phenomenon is more serious at high voltages, so that Because the ternary material decays quickly during high voltage cycling. In addition, due to the existenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/13
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 夏恒涛吴承仁柳娜阮丁山吴振豪
Owner NINGDE AMPEREX TECH
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