Detailed reason for the failure of lithium battery

著者：Iflowpower – Nhà cung cấp trạm điện di động

1 Lithium ion battery failure classification In order to prevent the above-mentioned performance attenuation and battery safety issues, the failure decomposition of lithium-ion batteries is bound to. The failure of the lithium-ion battery refers to the failure and safety failure of the battery performance attenuated by certain essential properties or abnormal use of performance. 2 The original lithium ion battery failure can be divided into endome and external causes.

The internal principle is the physical and chemical variation of the invalidation, the research scale can be traced back to the thermodynamics of the atomic, molecular scale, and the research failure process. Ihe ndị dị na mpụga gụnyere mmetụta, acupuncture, corrosion, nnukwu okpomọkụ combustion, ọdịda mmadụ, wdg. 3 Common failure performance of lithium ion batteries and its failure mechanism decomposition capacity attenuation failure: When the standard circulation life detection, the number of cycles reaches 500 times when the discharge capacity should not be less than 90% of the initial capacity.

Ma ọ bụ ọnụ ọgụgụ nke cycles ruru ugboro 1000, ikike mgbapụta ekwesịghị ịdị n&39;okpuru 80% nke ikike mbụ. Ọ bụrụ na ikike nwere ọdịda dị nkọ na okirikiri ọkọlọtọ, ọ bụ nke ọdịda attenuation ikike. Mgbọrọgwụ nke ọdịda ike batrị bụ ọdịda nke ihe onwunwe, yana njikọ chiri anya na ebumnuche ebumnuche dịka usoro nrụpụta batrị, ojiji batrị.

From the perspective of material, the fact that the fails to fail, the structural failure of the positive electrode material, the transition growth of the negative surface SEI, the electrolytic liquid and the deterioration, the fluid corrosion, the system trace impurities, etc. The structural failure of the positive electrode material: the structural failure of the positive electrode material includes cathode material particles, irreversible transformation, material dissemination, etc. LIMN2O4 will cause distortion to the Jahn-Teller effect during the charge and discharge process, and even particle rupture, resulting in electrical contact between particles.

LiMn1.5Ni0.5O4 material The four-square crystal system in the charge and discharge process, LiCoO2 material caused CO into the Li layer due to the transition of Li, caused the layered structure, restricting the layered structure during charge and discharge.

Ike. The negative electrode material failure: the failure of the graphite electrode occurs in the surface of the graphite, the graphite surface is reacted with the electrolytic solution, and the solid electrolyte interface phase (SEI) is machined. If excessive growth can cause the lithium ion content in the internal system, the result is caused by capacity attenuation.

The failure of silicon negative electrode materials is the cycle performance problem caused by its huge volume expansion. Electrolyte failure: LIPF6 stability is poor, easy to analyze to reduce the migration of Li + content in electrolyte. It is also easy to form HF with trace reactions in the electrolyte, resulting in corrosion inside the battery.

Ikuku ikuku adịghị mma iji mee ka electrolyte emebi emebi, viscosity na chromaticity nke electrolyte, na n&39;ikpeazụ na-eduga na nkwụsịtụ dị nkọ na ọrụ ion nnyefe. Ọdịda nke onye na-anakọta: mkpokọta mmiri mmiri corrosion, ntinye nke onye na-anakọta na-ebelata. HF, nke na-agbaze site na electrolyte dị n&39;elu, na-akpata corrosion nke onye na-anakọta ihe, na-emepụta ihe na-adịghị mma, na-ebute mmụba na kọntaktị ohmic ma ọ bụ ọdịda ihe na-arụ ọrụ.

N&39;oge a na-akwụ ụgwọ na usoro nkwụsị, a na-agbaze Cu foil n&39;okpuru ikike dị ala, na-etinye ya na elu dị mma, nke a na-akpọ ọla kọpa. Ụdị ọdịda mkpokọta na-emekarị ezughị iji mee ka ihe na-arụ ọrụ na-agbapụ n&39;etiti agglomeration na ihe na-arụ ọrụ, na enweghị ike ịnye ikike maka batrị. Internal resistance increase: The lithium ion battery internal resistance conference accompanied by energy density, voltage and power decrease, battery heat and other failure problems.

Metal factors leading to increased lithium-ion battery internal resistance are divided into battery-key materials and batteries. Battery Key Material: The microcrack and rupture of the positive electrode material, the damage of the negative electrode material is too thick, the electrolytic solution aging, the active material is detached from the current, and the contact of the active material and the conductive additive is worse (including the loss of conductive additives). Diaphragm, blockage, battery extreme ear welding abnormalities, etc.

Gburugburu ebe eji batrị: ọnọdụ okpomọkụ dị oke elu / dị ala, chaja dị elu, ụgwọ na-ebuwanye ibu na mwepu, usoro nrụpụta na nhazi batrị, wdg. Internal short circuit: internal short circuit tends to cause self-discharge, capacity attenuation, local thermal out of control, and cause safety accidents. Short-circuit between copper / aluminum concentration: battery processing or metal foreign body puncture diaphragm or electrode, battery pack in the battery package, causes positive, negative set fluid contact.

The short circuit caused by the diaphragm failure, the diaphragm, diaphragm, diaphragm corrosion, etc. can result in failure of the diaphragm, the failure diaphragm loss of electron insulation or gap is positive, negative electrode micro contact, then the local fever is severe, continuous charge and discharge will be spread to four weeks , Cause heat loss. Ọdịghị ọcha na-ebute sekit dị mkpụmkpụ: adịghị ọcha ọla ngbanwe na slurry electrode dị mma nwere ike ibute diaphragm ịkpọpu ma ọ bụ kwalite electrode lithium delegra na-adịghị mma iji mee ka sekit dị mkpụmkpụ dị n&39;ime.

Short-circuit caused by lithium dendrites: a lithium lactary crystal, dendritic crystal pass through diaphragm, during the long cycle. Battery design, manufacturing or battery pack assembly, design is unreasonable or local pressure will also cause internal short circuits. N&39;oge mmalite nke ịse batrị na overhang, a ga-enwekwa mkpirisi okirikiri.

Nri gas nke ngwọta electrolytic na usoro mgbanwe batrị na usoro nhazi batrị bụ gas nkịtị, mana mgbanwe oriri electrolyte na-ahapụ gas ma ọ bụ ihe electrode ziri ezi hapụ oxygen bụ ihe na-adịghị mma. Often out in this soft bag battery, it will cause excessive pressure in the battery, and stroke the encapsulation aluminum membrane, internal battery contact problem, etc. Igwe ọkụ na-ekpo ọkụ na-enweghị nchịkwa pụtara na okpomọkụ nke batrị lithium ion bụ mpaghara ma ọ bụ n&39;ozuzu okpomọkụ ịrị elu, na okpomọkụ enweghị ike ịgbasa n&39;oge, na nnukwu ego na-agbakọta n&39;ime ma na-ebute mmetụta ndị ọzọ.

Ihe na-akpata site na ọnwụ ọkụ nke batrị lithium-ion bụ ọnọdụ arụ ọrụ na-adịghị mma, ya bụ, mmegbu, sekit dị mkpirikpi, mmụba dị elu, okpomọkụ dị elu, squeezing, na acupuncture. Nyocha nke lithium n&39;elu batrị adịghị mma, bụ ihe na-emekarị batrị lithium-ion ịka nká. Nyocha nke lithium na-ebelata ion lithium na-arụ ọrụ n&39;ime batrị ahụ, enwere ike ịda mbà, na ntanye dendritic nwere ike ịkpata ọnọdụ ugbu a na okpomọkụ, na n&39;ikpeazụ kpatara nsogbu nchekwa batrị.