Lithium battery with V2O5, Sc2O3 and LiMn2O4 as positive electrode materials, and preparation method thereof

Abstract

The invention relates to the technical field of lithium battery positive electrode materials, and discloses a lithium battery with V2O5, Sc2O3 and LiMn2O4 as positive electrode materials, and a preparation method thereof. The positive electrode material comprises the following raw materials in proportions by weight: lithium hydroxide monohydrate, vanadium pentoxide, scandium oxide, manganese dioxide, and a precipitating agent, wherein the precipitating agent is potassium carbonate. According to the lithium battery with V2O5, Sc2O3 and LiMn2O4 as the positive electrode materials, and the preparation method thereof provided by the invention, the calcination reaction of V2O5 and Sc2O3 with LiMn2O4 is used to form LiMn1.78-1.94V0.02-0.09Sc0.04-0.13O4, the LiMn1.78-1.94V0.02-0.09Sc0.04-0.13O4 has better crystallinity, the structure has good stability, manganese is prevented from being dissolved in an electrolyte solution, so that the cyclic characteristic of an electrode is enhanced, the capacity of the electrode in a cyclic process is increased, and the electrochemical performance of the electrode material is improved; the LiMn1.78-1.94V0.02-0.09Sc0.04-0.13O4 has larger particle size,and particles are aggregated together through an Sc-V metal bond, so that the Li+ ion transmission path of the electrode material is shortened, the ion diffusion rate is increased, and therefore the electronic conductivity of the electrode material is improved.

Description

technical field

[0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a scandium-vanadium-combined lithium-manganese oxide used as an anode material for lithium batteries and a preparation method thereof. Background technique

[0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. , with the development of science and technology, lithium batteries have become the mainstream now. At present, research on lithium-ion batteries with high power, high capacity, good stability and strong temperature adaptability is the current research focus of lithium-ion batteries, among which lithium manganese oxide LiMn 2 o 4 As a cathode material for lithium-ion batteries,...

Examples

preparation example Construction

[0021] In order to achieve the above object, the present invention provides the following technical solutions: a scandium vanadium lithium manganese oxide as a positive electrode material for a lithium battery and a preparation method thereof, comprising the following raw materials in proportions by weight, 30-40 parts of lithium hydroxide- Hydrate, 1-5 parts of vanadium pentoxide, 3-8 parts of scandium trioxide, 20-30 parts of manganese dioxide, 25-40 parts of precipitant, the molecular formula of lithium hydroxide monohydrate is LiOH·H 2 O, of which the LiOH content is 63.5-65.2%, and the molecular formula of vanadium pentoxide is V 2 o 5 , where V 2 o 5 The content is 95.2-97.4%, and the molecular formula of scandium trioxide is Sc 2 o 3 , Sc 2 o 3 The content is 94.5-96.1%, and the molecular formula of manganese dioxide is MnO 2 , MnO 2 The content is 93.5-95.8%, the precipitation agent is potassium carbonate, and the molecular formula of potassium carbonate is K ...

Embodiment 1

[0027] (1) Preparation of lithium manganate LiMn 2 o 4 : Take 40 parts of lithium hydroxide monohydrate and 30 parts of manganese dioxide in turn and put them into a high-energy planetary ball mill, then add 200mL of absolute ethanol, grind for 6-8h, and place the obtained black-gray powder mixture in an oven. Heat to 80-85°C, dry for 1-1.5h, then place the dried black-gray mixture in a muffle furnace, in air atmosphere, heat to 760-780°C, react for 10-12h, after the reaction Anneal at 750-760°C for 8 hours, cool to room temperature, and obtain black solid lithium manganate LiMn 2 o 4 Component 1.

[0028] (2) Preparation of Scandium Vanadium Lithium Manganese Oxide LiMn 1.94 V 0.02 sc 0.04 o 4 : Take 1 part of vanadium pentoxide and 3 parts of scandium trioxide and put them in a high-energy planetary ball mill, add 50mL of absolute ethanol, grind for 3-5h, put the obtained powder mixture in an oven, and heat to 80-85 °C, dry for 30-40min to obtain yellow solid powder ...

Embodiment 2

[0031] (1) Preparation of lithium manganate LiMn 2 o 4 : Take 36 parts of lithium hydroxide monohydrate and 28 parts of manganese dioxide in turn and put them into a high-energy planetary ball mill, then add 200mL of absolute ethanol, grind for 6-8h, and place the obtained black-gray powder mixture in an oven. Heat to 80-85°C, dry for 1-1.5h, then place the dried black-gray mixture in a muffle furnace, in air atmosphere, heat to 760-780°C, react for 10-12h, after the reaction Anneal at 750-760°C for 8 hours, cool to room temperature, and obtain black solid lithium manganate LiMn 2 o 4 Component 2.

[0032] (2) Preparation of Scandium Vanadium Lithium Manganese Oxide LiMn 1.90 V 0.04 sc 0.06 o 4 : Weigh 2 parts of vanadium pentoxide and 4 parts of scandium trioxide and place them in a high-energy planetary ball mill, add 50mL of absolute ethanol, grind for 3-5h, put the obtained powder mixture in an oven, and heat to 80-85 °C, dry for 30-40min to obtain yellow solid pow...

technical field

[0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a scandium-vanadium-combined lithium-manganese oxide used as an anode material for lithium batteries and a preparation method thereof. Background technique

[0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. , with the development of science and technology, lithium batteries have become the mainstream now. At present, research on lithium-ion batteries with high power, high capacity, good stability and strong temperature adaptability is the current research focus of lithium-ion batteries, among which lithium manganese oxide LiMn 2 o 4 As a cathode material for lithium-ion batteries,...

Examples

preparation example Construction

[0021] In order to achieve the above object, the present invention provides the following technical solutions: a scandium vanadium lithium manganese oxide as a positive electrode material for a lithium battery and a preparation method thereof, comprising the following raw materials in proportions by weight, 30-40 parts of lithium hydroxide- Hydrate, 1-5 parts of vanadium pentoxide, 3-8 parts of scandium trioxide, 20-30 parts of manganese dioxide, 25-40 parts of precipitant, the molecular formula of lithium hydroxide monohydrate is LiOH·H 2 O, of which the LiOH content is 63.5-65.2%, and the molecular formula of vanadium pentoxide is V 2 o 5 , where V 2 o 5 The content is 95.2-97.4%, and the molecular formula of scandium trioxide is Sc 2 o 3 , Sc 2 o 3 The content is 94.5-96.1%, and the molecular formula of manganese dioxide is MnO 2 , MnO 2 The content is 93.5-95.8%, the precipitation agent is potassium carbonate, and the molecular formula of potassium carbonate is K ...

Embodiment 1

[0027] (1) Preparation of lithium manganate LiMn 2 o 4 : Take 40 parts of lithium hydroxide monohydrate and 30 parts of manganese dioxide in turn and put them into a high-energy planetary ball mill, then add 200mL of absolute ethanol, grind for 6-8h, and place the obtained black-gray powder mixture in an oven. Heat to 80-85°C, dry for 1-1.5h, then place the dried black-gray mixture in a muffle furnace, in air atmosphere, heat to 760-780°C, react for 10-12h, after the reaction Anneal at 750-760°C for 8 hours, cool to room temperature, and obtain black solid lithium manganate LiMn 2 o 4 Component 1.

[0028] (2) Preparation of Scandium Vanadium Lithium Manganese Oxide LiMn 1.94 V 0.02 sc 0.04 o 4 : Take 1 part of vanadium pentoxide and 3 parts of scandium trioxide and put them in a high-energy planetary ball mill, add 50mL of absolute ethanol, grind for 3-5h, put the obtained powder mixture in an oven, and heat to 80-85 °C, dry for 30-40min to obtain yellow solid powder ...

Embodiment 2

[0031] (1) Preparation of lithium manganate LiMn 2 o 4 : Take 36 parts of lithium hydroxide monohydrate and 28 parts of manganese dioxide in turn and put them into a high-energy planetary ball mill, then add 200mL of absolute ethanol, grind for 6-8h, and place the obtained black-gray powder mixture in an oven. Heat to 80-85°C, dry for 1-1.5h, then place the dried black-gray mixture in a muffle furnace, in air atmosphere, heat to 760-780°C, react for 10-12h, after the reaction Anneal at 750-760°C for 8 hours, cool to room temperature, and obtain black solid lithium manganate LiMn 2 o 4 Component 2.

[0032] (2) Preparation of Scandium Vanadium Lithium Manganese Oxide LiMn 1.90 V 0.04 sc 0.06 o 4 : Weigh 2 parts of vanadium pentoxide and 4 parts of scandium trioxide and place them in a high-energy planetary ball mill, add 50mL of absolute ethanol, grind for 3-5h, put the obtained powder mixture in an oven, and heat to 80-85 °C, dry for 30-40min to obtain yellow solid pow...