Positive pole piece and lithium ion battery containing pole piece
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A technology of positive pole piece and positive current collector, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of scarcity of cobalt resources, difficult to popularize and use, and poor resistance to overcharge.
Inactive Publication Date: 2016-12-21
NINGDE AMPEREX TECH
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[0003] Among several common cathode materials for lithium-ion batteries, Ni-based cathode materials have high specific capacity and low cost, such as LiNiO 2 It is an excellent positive electrode material, and its ideal reversible specific capacity is 280mAh / g. However, the instability of chemical and electrochemical properties causes it to have defects in synthesis difficulty and safety, making it difficult to popularize and use
Mn-based positive electrode materials are environmentally friendly and low in cost, such as spinel lithium manganese oxide LiMn 2 o 4 The oxidation-reduction temperature of the material is as high as 250°C, which has high safety performance. However, the energy density of this type of material is low, and crystal distortion and manganese ion dissolution are prone to occur during recycling, resulting in rapid battery capacity decay.
Conventional LiCoO 2 It has the advantages of simple preparation process, high charge and discharge capacity, and good cycle performance, but its development space is limited due to the scarcity of cobalt resources, high cost, large environmental pollution, and poor anti-overcharge ability.
[0004] Ni-Co-Mn based ternary materials integrated LiCoO 2 , LiNiO 2 and LiMnO 2 However, its disadvantages such as low compaction of secondary particles and electrochemical instability under high voltage conditions greatly restrict its application in the pursuit of higher energy density consumer lithium-ion batteries
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Embodiment 1
[0061] A lithium-ion battery positive electrode sheet and a lithium-ion battery using the positive electrode, the specific preparation steps of which are as follows:
[0062] 1. Preparation of ternary materials:
[0063] 1.1 MnSO 4 , Ni(NO 3 ) 2 、CoCl 2 The solution is mixed evenly, the molar ratio of the three metal elements is Co:Ni:Mn=0.6:0.2:0.2, and then mixed with the precipitant NH 4 HCO 3 Reaction, using co-precipitation to prepare the precursor;
[0064] 1.2 Treat the precursor in an air atmosphere at 500°C for 5 hours to obtain a composite oxide containing Ni, Co, and Mn elements;
[0065] 1.3 Add Li to the composite oxide containing Ni, Co, Mn elements 2 CO 3 , the molar ratio is 1≤Li:(Ni+Mn+Co)≤1.1, after ball milling and mixing uniformly, treat it at 900°C for 10 hours in the air atmosphere to prepare the conventional ternary material LiCo 0.6 mn 0.2 Ni 0.2 o 2 .
[0066] 2. Preparation of positive pole piece:
[0067] 2.1 Dissolve the prepared terna...
Embodiment 2
[0072] 1. Preparation of ternary material: Refer to Example 1 for the first three steps, and change the ratio of the three metal elements, Co:Ni:Mn=0.6:0.3:0.1, to prepare a modified ternary material.
[0073] 2. Refer to Example 1 for the preparation of the positive electrode sheet.
[0074] 3. Refer to Example 1 for the preparation of the negative electrode.
[0075] 4. For battery assembly, refer to Example 1.
Embodiment 3
[0077] 1. Preparation of ternary material: Refer to Example 1 for the first three steps, and change the ratio of the three metal elements, Co:Ni:Mn=0.6:0.1:0.3, to prepare a modified ternary material.
[0078] 2. Refer to Example 1 for the preparation of the positive electrode sheet.
[0079]3. Refer to Example 1 for the preparation of the negative electrode.
[0080] 4. For battery assembly, refer to Example 1.
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Abstract
The invention relates to the field of lithium ion batteries, and particularly relates to a positive pole piece and a lithium ion battery containing the pole piece. The positive pole piece provided by the invention comprises a positive pole current collector, and a positive pole active material adhered to the positive pole current collector, the positive pole active material contains a modified ternary material with a coating layer on the surface, the structural formula of the modified ternary material is LiCo(1-x-y)MnxNiyO2, wherein x is more than 0 and is less than or equal to 0.3, y is more than 0 and is less than or equal to 0.3, and x+y is more than 0 and is less than or equal to 0.6, and the coating layer contains imidazole ion liquid. According to the invention, the proportion of the contents of Ni element and Mn element in the ternary material can be optimized, meanwhile, the imidazole ion liquid is added in the positive pulping process, the direct contact of an active material and the electrolyte can be blocked to avoid corrosion, and the stability of the battery is improved.
Description
technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to a positive pole piece and a lithium-ion battery containing the pole piece. Background technique [0002] With the rapid development of modern science and technology, small / miniature electronic products and communication tools are used more and more widely, and higher requirements are placed on the battery performance of such electronic products. As a new generation of green high-energy rechargeable batteries, lithium-ion batteries have the characteristics of high specific energy, high working voltage, long cycle life, low self-discharge rate and good safety performance, and are widely used in power supplies for mobile phones, laptop computers, video cameras, cameras, etc. , and gradually replace traditional batteries in the fields of aviation and navigation, medical instruments and military communication equipment. At the same time, with the expansion of the appli...
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