Novel positive electrode material of lithium ion battery and preparation method of positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of destroying the stability of layered structures and the impact of nickel-cobalt-manganese ternary materials on charge and discharge performance, and achieve good cycle performance , avoid material damage, avoid the effect of structure damage

Inactive Publication Date: 2016-08-24
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Mn may exist in nickel-cobalt-manganese ternary materials 3+ , Mn 3+ prone to disproportionation reaction, the formed Mn 2+ Dissolved in the electrolyte, destroying the stability of the layered structure, thus negatively affecting the charge and discharge performance of nickel-cobalt-manganese ternary materials

Method used

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  • Novel positive electrode material of lithium ion battery and preparation method of positive electrode material
  • Novel positive electrode material of lithium ion battery and preparation method of positive electrode material
  • Novel positive electrode material of lithium ion battery and preparation method of positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0029] Dissolve nickel acetate, cobalt acetate, cerium nitrate, and lithium nitrate into a 0.5mol / L aqueous solution in a molar ratio of 0.5:0.2:0.3:1.1, and add 0.5mol / L citric acid dropwise during stirring into the prepared aqueous solution, and adjust the pH to 3.0 to form a sol. Then, the reaction was continuously stirred at 60° C. for 12 h to form a gel. The gel was dried at 120°C for 2 hours, and then placed in a sintering furnace for sintering at 900°C for 6 hours. The sintered material was ground and passed through a 300-mesh sieve to obtain a new lithium battery cathode material of Ni, Co, and Ce. Such as figure 1 As shown, the agglomerated particles formed by the agglomeration of the primary single crystal particles of the obtained positive electrode material have a particle size of about 3 μm. The cycle retention rate of the lithium ion battery prepared by using the positive electrode material at 0.1C4.25V normal temperature for 100 cycles is 93%.

Embodiment 2

[0031] Dissolve nickel acetate, cobalt acetate, molybdenum nitrate, and lithium hydroxide into a 0.05mol / L aqueous solution with a molar ratio of 0.8:0.1:0.1:1.08, and add 0.05mol / L tartaric acid dropwise during stirring into the prepared aqueous solution, and adjust the pH to 2.5 to form a sol. Then, the reaction was continuously stirred at 80° C. for 8 h to form a gel. The gel was dried at 150°C for 1 hour, and then placed in a sintering furnace for sintering at 930°C for 7 hours. The sintered material was ground and passed through a 300-mesh sieve to obtain a new lithium battery cathode material of Ni, Co, and Mo. The agglomerated particles formed by the agglomeration of the primary single crystal particles of the positive electrode material have a particle size of about 4 μm. The cycle retention rate of the lithium ion battery prepared by using the positive electrode material at 0.1C4.25V normal temperature for 100 cycles is 92%.

Embodiment 3

[0033] Dissolve nickel nitrate, cobalt nitrate, titanium nitrate, and lithium acetate into a 1.5mol / L aqueous solution in a molar ratio of 0.3:0.4:0.3:1.06, and add 1.5mol / L maleic acid dropwise during stirring Add it to the prepared aqueous solution, and adjust the pH to 2 to form a sol. Then the reaction was stirred continuously at 70°C for 10 h to form a gel. The gel was dried at 100°C for 4 hours, and then placed in a sintering furnace for sintering at 950°C for 6 hours. The sintered material was ground and passed through a 300-mesh sieve to obtain a new lithium battery cathode material of Ni, Co, and Ti. The agglomerated particles formed by the agglomeration of the primary single crystal particles of the positive electrode material have a particle size of about 8 μm. The cycle retention rate of the lithium ion battery prepared by using the positive electrode material at 0.1C4.25V normal temperature for 100 cycles is 91%.

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Abstract

The invention relates to a novel positive electrode material of a lithium ion battery and a preparation method of the positive electrode material. The general formula of the positive electrode material is Li<y>(NiCoX<c>)O<2>, wherein X is an element more than or equal to +3 valence except Mn and comprises one or more of Ti, Zr, Ce, W, V, Cr, Sn, Sr, Mo, Sc, La, P, Nb, Y and Ga, y is more than or equal to 0.9 but less than or equal to 1.1, a is more than or equal to 0.3 but less than or equal to 0.8, b is more than or equal to 0.1 but less than or equal to 0.5, c is more than or equal to 0.01 but less than or equal to 0.3, (a+b+c) is equal to 1, c is less than or equal to a, and c is less than b. In the positive electrode material, the material damage caused by valence state change of the Mn is considered on the basis of the positive electrode material LiNiCoMnO<2> of the lithium ion battery, the Mn is substituted by the element X, the valence state of the element X is not changed, a good supporting and stabilizing effect can be exerted on a lattice structure, and thus, the cycle performance of the material is effectively enhanced.

Description

technical field [0001] The invention relates to a novel lithium-ion battery cathode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Nickel-cobalt-manganese ternary materials are currently researched and used more and more cathode materials for lithium-ion batteries. In the composition, Ni and Co elements are active materials, which provide capacity for the battery through electrochemical reactions, and Mn elements are the crystal structure of the material. Provides support and enhances the structural stability of the material. The three elements of Ni, Co, and Mn cooperate with each other, so that the nickel-cobalt-manganese ternary material has excellent comprehensive properties, which improves the performance of the material to a certain extent. However, Mn may exist in nickel-cobalt-manganese ternary materials 3+ , Mn 3+ prone to disproportionation reaction, the formed Mn 2+ Dissolving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/525H01M10/0525Y02E60/10
Inventor 王汝娜申兰耀周恒辉高原
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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