Positive electrode material and preparation method thereof, lithium battery positive electrode sheet and solid lithium battery
A technology of positive electrode material and positive electrode active material, which is applied in the field of positive electrode material and its preparation, positive electrode sheet of lithium battery and solid-state lithium battery, can solve the problems of hindering transmission, poor compatibility, low ionic conductivity, etc., to achieve coating The effect of firmness and tightness, good compatibility and high conductivity
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preparation example Construction
[0029] A second aspect of the present invention provides a preparation method of a positive electrode material, wherein the preparation method comprises the following steps:
[0030] (1) The positive active material, tetrabutyl titanate, ammonium sulfide and ethanol are subjected to the first reaction to obtain TiS 2 coated positive active material;
[0031] (2) The TiS 2 Coated cathode active material with TiF 4 Carry out the second reaction to obtain fluorinated TiS 2 Coated cathode material.
[0032] According to the present invention, the first reaction and the second reaction can be carried out in a closed container, wherein the closed container is not particularly limited, for example, it can be a glove box, and the glove box can be obtained commercially, for example, for example , can be purchased from Braun Inert Gas Systems (Shanghai) Co., Ltd., the model is Unilab1250.
[0033] According to the present invention, in step (1), the conditions of the first reaction...
Embodiment 1
[0078] This example is used to illustrate the positive electrode material and the preparation method thereof, as well as the positive electrode sheet and the all-solid-state battery of the present invention.
[0079] (1) Preparation of positive electrode sheet C
[0080] First prepare fluorinated TiS 2 Material-coated positive active material, the positive active material body is LiCoO 2 Materials, the specific preparation method is, 1000g LiCoO 2 (particle size is 5μm), 150gLi 10 GeP 2 S 12 Solid electrolyte material (ionic conductivity 1×10 -2 S / cm, electronic conductivity 2×10 -12 S / cm, particle size 5μm), 61mL tetrabutyl titanate, 12.1g ammonium sulfide (NH 4 ) 2 Put S and 500 mL of ethanol into a closed reaction vessel with a volume of 5 L, turn on stirring, and heat to 250 ° C after sealing. After 2 h of reaction, the obtained black powder precipitate is taken out, and heated to 800 ° C in air for 4 h to obtain TiS 2 Coated LiCoO 2 material, then mix this mater...
Embodiment 2
[0090] This example is used to illustrate the positive electrode material and the preparation method thereof, as well as the positive electrode sheet and the all-solid-state battery of the present invention.
[0091] The solid electrolyte was prepared according to the same method as in Example 1, except that: in the preparation of the positive electrode sheet C in step (1), fluorinated TiS was prepared 2 Material-coated LiCoO 2 materials, instead of using 61 mL of tetrabutyl titanate and 12.1 g of ammonium sulfide (NH 4 ) 2 S, but 122 mL of tetrabutyl titanate, 24.2 g of ammonium sulfide (NH 4 ) 2 S (ie, 4% TiS 2 +0.5%TiF 4 ), the coating thickness of the product is 150 nm.
[0092] As a result, the battery of this embodiment is obtained, which is marked as S2.
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Abstract
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