Arising from the increasing demand for electric vehicles(EVs),Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1,x≥0.8)cathode with greatly increased energy density are being researched and commercialized for lithium-ion ...Arising from the increasing demand for electric vehicles(EVs),Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1,x≥0.8)cathode with greatly increased energy density are being researched and commercialized for lithium-ion batteries(LIBs).However,parasitic crack formation during the discharge–charge cycling process remains as a major degradation mechanism.Cracking leads to increase in the specific surface area,loss of electrical contact between the primary particles,and facilitates liquid electrolyte infiltration into the cathode active material,accelerating capacity fading and decrease in lifetime.In contrast,Ni-rich NCM when used as a single crystal exhibits superior cycling performances due to its rigid mechanical property that resists cracking during long charge–discharge process even under harsh conditions.In this paper,we present comparative investigation between single crystal Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(SC)and polycrystalline Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(PC).The relatively improved cycling performances of SC are attributed to smaller anisotropic volume change,higher reversibility of phase transition,and resistance to crack formation.The superior properties of SC are demonstrated by in situ characterization and battery tests.Consequently,it is inferred from the results obtained that optimization of preparation conditions can be regarded as a key approach to obtain well crystallized and superior electrochemical performances.展开更多
We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have...We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have not yet been a silver bullet due to the dendrite formation and interfacial issue.Here,we introduce the hybrid polymer electrolyte via a novel solvent-free strategy as well as utilize a polymerization and gelation effect of cyanoethyl polyvinyl alcohol to achieve superior electrochemical performance.The hybrid polymer electrolyte,using cyanoethyl polyvinyl alcohol,demonstrates a stable artificial solid electrolyte interface layer,which suppresses the continuous decomposition of Li salts.Importantly,we also present the lithium-graphite composite anode to reach the super-highenergy-density anode materials.Taken together,these advancements represent a significant stride toward addressing the challenges associated with all-solid-state lithium metal batteries.展开更多
To further increase the energy density of lithium-ion batteries(LIBs),various researches have been conducted on high-voltage and high-capacity cathode materials.In this perspective,monoclinic Li_(3)V_(2)(PO_(4))_(3) i...To further increase the energy density of lithium-ion batteries(LIBs),various researches have been conducted on high-voltage and high-capacity cathode materials.In this perspective,monoclinic Li_(3)V_(2)(PO_(4))_(3) is a promising candidate due to its promising theoretical discharge capacity of 197 mAh/g with complex phase transition in the voltage range of 3.0 to 4.8 V.However,such asymmetric phase transition behavior with 3 Li^(+)ion extraction/insertion is highly irreversible,resulting in an initial discharge capacity of 163 mAh/g with deteriorated capacity retention.We suggest that cycling Li_(3)V_(2)(PO_(4))_(3) in the voltage range of 3.0 to 4.5 V suppresses the irreversible phase transition and elution of transition metal.Hence,Li_(3)V_(2)(PO_(4))_(3) in the voltage range of 3.0 to 4.5 V delivers an initial discharge capacity of about 142 mAh/g and exhibits extremely long cycle retention(78.70%2,000 cycles),as when cycling in the voltage range of 3.0 to 4.3 V(81.67%2,000 cycles).Furthermore,we present the possibility of a Li_(3)V_(2)(PO_(4))_(3)||Li_(3)V_(2)(PO_(4))_(3) symmetric all-solid-state battery based on an N/P ratio and a cutoff voltage design,which is demonstrated in liquid electrolyte half-cells and symmetric full cells.展开更多
基金supported by the Technology Innovation Program(RS-2023-00256202Development of MLCB design and manufacturing process technology for board mounting)funded By the Ministry of Trade,Industry&Energy(MOTIE,Korea)+2 种基金supported by the Technology Innovation Program(or Industrial Strategic Technology Development Program-Public-private joint investment semiconductor R&D program(K-CHIPS)to foster high-quality human resources)(RS-2023-00237003,High selectivity etching technology using cryoetch)funded By the Ministry of Trade,Industry&Energy(MOTIE,Korea)supported by 2022 Research Grant from Kangwon National University(No.202203080001)supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(RS-2023-00280367).
文摘Arising from the increasing demand for electric vehicles(EVs),Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1,x≥0.8)cathode with greatly increased energy density are being researched and commercialized for lithium-ion batteries(LIBs).However,parasitic crack formation during the discharge–charge cycling process remains as a major degradation mechanism.Cracking leads to increase in the specific surface area,loss of electrical contact between the primary particles,and facilitates liquid electrolyte infiltration into the cathode active material,accelerating capacity fading and decrease in lifetime.In contrast,Ni-rich NCM when used as a single crystal exhibits superior cycling performances due to its rigid mechanical property that resists cracking during long charge–discharge process even under harsh conditions.In this paper,we present comparative investigation between single crystal Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(SC)and polycrystalline Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(PC).The relatively improved cycling performances of SC are attributed to smaller anisotropic volume change,higher reversibility of phase transition,and resistance to crack formation.The superior properties of SC are demonstrated by in situ characterization and battery tests.Consequently,it is inferred from the results obtained that optimization of preparation conditions can be regarded as a key approach to obtain well crystallized and superior electrochemical performances.
基金supported by the Technology Innovation Program(RS-2023-00256202,Development of MLCB design and manufacturing process technology for board mounting)funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea).
文摘We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have not yet been a silver bullet due to the dendrite formation and interfacial issue.Here,we introduce the hybrid polymer electrolyte via a novel solvent-free strategy as well as utilize a polymerization and gelation effect of cyanoethyl polyvinyl alcohol to achieve superior electrochemical performance.The hybrid polymer electrolyte,using cyanoethyl polyvinyl alcohol,demonstrates a stable artificial solid electrolyte interface layer,which suppresses the continuous decomposition of Li salts.Importantly,we also present the lithium-graphite composite anode to reach the super-highenergy-density anode materials.Taken together,these advancements represent a significant stride toward addressing the challenges associated with all-solid-state lithium metal batteries.
基金supported by the Technology Innovation Program(RS-2023-00256202,Development of MLCB design and manufacturing process technology for board mounting)funded by the Ministry of Trade,Industry and Energy(MOTIE,Korea)the Technology Innovation Program(or Industrial Strategic Technology Development Program-Public-Private joint investment semiconductor R&D program[K-CHIPS]to foster high-quality human resources)(RS-2023-00237003,High selectivity etching technology using cryoetch)funded by the Ministry of Trade,Industry and Energy(MOTIE,Korea)+1 种基金a 2022 Research Grant from Kangwon National University(No.202203080001)the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(RS-2023-00280367).
文摘To further increase the energy density of lithium-ion batteries(LIBs),various researches have been conducted on high-voltage and high-capacity cathode materials.In this perspective,monoclinic Li_(3)V_(2)(PO_(4))_(3) is a promising candidate due to its promising theoretical discharge capacity of 197 mAh/g with complex phase transition in the voltage range of 3.0 to 4.8 V.However,such asymmetric phase transition behavior with 3 Li^(+)ion extraction/insertion is highly irreversible,resulting in an initial discharge capacity of 163 mAh/g with deteriorated capacity retention.We suggest that cycling Li_(3)V_(2)(PO_(4))_(3) in the voltage range of 3.0 to 4.5 V suppresses the irreversible phase transition and elution of transition metal.Hence,Li_(3)V_(2)(PO_(4))_(3) in the voltage range of 3.0 to 4.5 V delivers an initial discharge capacity of about 142 mAh/g and exhibits extremely long cycle retention(78.70%2,000 cycles),as when cycling in the voltage range of 3.0 to 4.3 V(81.67%2,000 cycles).Furthermore,we present the possibility of a Li_(3)V_(2)(PO_(4))_(3)||Li_(3)V_(2)(PO_(4))_(3) symmetric all-solid-state battery based on an N/P ratio and a cutoff voltage design,which is demonstrated in liquid electrolyte half-cells and symmetric full cells.
