BTR NEW MATERIAL GROUP CO., LTD.

An anode material includes a core and a coating layer. The coating layer is located on a surface of the core, the core includes natural graphite and first amorphous carbon filled in pores of the natural graphite, and the coating layer includes second amorphous carbon. A Raman spectrum of the anode material has a D peak and a G peak, and an intensity ratio of the D peak to the G peak is I D /I G . The core includes an inner layer region and an outer layer region outside the inner layer region, and the outer layer region is closely adjacent to the coating layer. An average value of I D /I G in the inner layer region is K a , and an average ratio of I D /I G values of the inner layer region to the outer layer region is K, which satisfy: 0.4≤K a ≤0.7, and 0.5≤K<0.9.

An anode material comprising: a carbon material having pores therein, wherein a total pore volume of pores with a pore size of 3 nm or more and 1,000 nm or less, measured by mercury intrusion porosimetry is V1, and 0<V1<0.1 mL/g; a total pore volume of pores with a pore size of 3 nm or more and 400 nm or less, measured by mercury intrusion porosimetry is V2, and a ratio V2/V1 ranges from 40% to 70%; and a total pore volume of pores with a pore size of 3 nm or more and 500 nm or less, measured by mercury intrusion porosimetry is V3, and a ratio V3/V1≥60%.

The present application relates to a field of anode material, and a silicon carbon composite anode material and preparation method thereof, and a lithium ion battery provided. The silicon carbon composite anode material includes a silicon-based active particle, a conductive material, and a carbon coating layer, where the carbon coating layer is present on surface of the silicon-based active particle and/or the conductive material; and a semi-width of an X-ray diffraction angle (2θ) of the silicon-based active particle on a crystal face (111) is greater than or equal to 0.5 degree when X-ray diffraction of the silicon-based active particle is tested with CuKα ray. The silicon carbon composite anode material and preparation method thereof, and a lithium ion battery can effectively inhibit volume expansion of anode material and improve cycle performance of battery.

Provided is an anode material and a battery. The anode material includes a carbon matrix and an active substance, and at least a portion of the active substance is distributed in the carbon matrix; and surface cleanliness of the anode material is γ, and γ≥60%. The anode material and the battery provided in the present disclosure can alleviate cyclic attenuation of the anode material, reduce side reactions between the anode material and an electrolyte solution, and reduce a gas production phenomenon of the anode material, thereby comprehensively improving the capacity, expansion performance, and cycling performance of the anode material.

Provided is carbon material, anode material, and battery. The carbon material has pores, and a length-diameter ratio of particles of the carbon material is 3-15. The particles of the carbon material of the present disclosure have a rod-shaped structure, and the rod-shaped particles of the carbon material may be arranged and stacked together to reduce gaps among the particles of the carbon material and improve the compaction density of the carbon material, thereby improving the surface capacity density of a carbon material electrode sheet.

Provided is an anode materials and battery. The anode material contains a carbon matrix and an active substance, and the carbon matrix contains oxygen element and nitrogen element; and a mass content of the oxygen element in the anode material is A %, a mass content of the nitrogen element in the anode material is B %, powder conductivity of the anode material is P S/cm, and A, B, and P meet the following relationship: M = AB P , M ≤ 5 . In the anode material provided in the present application, the relationship of the nitrogen content, the oxygen content, and the powder M = AB P , M ≤ 5 .

Provided is anode material and battery. The anode material includes a silicon-based core, and a coating layer at least partially coated on a surface of the silicon-based core; the anode material satisfies that a ratio B:A is 1 to 100, where A is a mass ratio of oxygen to lithium in the anode material, and B is an atomic ratio of the number of oxygen atoms to silicon atoms obtained by test with an X-ray photoelectron spectrometer on the anode material. The ratio B:A in the anode material actually represents an oxidation degree on a surface layer of the anode material. A larger ratio indicates a higher degree of surface oxidation.

The present disclosure relates to the field of negative electrode materials, and provides a negative electrode material and a preparation method therefor, and a lithium ion battery. The negative electrode material comprises an aggregate, the aggregate comprising an active substance and a carbon material. The mass percentage of the active substance in the aggregate gradually decreases from the center to the surface of the aggregate. The negative electrode material provided by the present disclosure can effectively suppress volume expansion of the negative electrode material and improve battery cycle performance.

The present application relates to a silicon-oxygen composite anode material and the preparation method thereof, and a lithium-ion battery. Wherein the silicon-oxygen composite anode material comprises a silicon-oxygen material and a composite coating layer coating the surface of the silicon-oxygen material. The composite coating layer comprises a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. The silicon-oxygen composite anode material and the preparation method thereof are simple and low cost, which is also easy to conduct industrial production, moreover, the prepared silicon-oxygen composite anode material has excellent electrochemical cycle and expansion inhibition performance, which can prolong the life-span of a lithium ion battery.

An anode material including a silicon-based core and a carbon layer disposed on at least part of a surface of the silicon-based core are described. The silicon-based core includes nano-silicon and a silicate containing a metal M element. The anode material is subjected to section and energy spectrum analysis, k1≤10, k2≤5, and 0.1<k2/k1≤1 are satisfied. The method for preparing the anode material includes: heating and evaporating the pre-disproportionated silicon oxide material and M metal source material to obtain silicon oxide gas and metal source gas; mixing and condensing these two gases to obtain the core material; and performing carbon coating treatment to obtain the anode material. The metal silicate in the prepared anode material effectively separates a nano-silicon domain and a silicon oxide domain, is relatively uniform in distribution, and has high initial Coulombic efficiency and good cycle performance.